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- From: montnaro@spyder.crd.ge.com (Skip Montanaro)
- Newsgroups: alt.sources
- Subject: Program to discren machine architecture information
- Message-ID: <MONTNARO.90Jun19090729@spyder.crd.ge.com>
- Date: 19 Jun 90 13:07:29 GMT
-
-
- I originally sent a request to comp.arch looking for a program to give me
- information regarding machine architecture (endianness, floating point
- representation, etc). Several people responded with references to Steve
- Pemberton's config program. I have been inundated with requests for that
- program (mostly it seems from people employeed by computer or processor
- vendors...). To try and stem the tide of mail requests I am posting it.
-
- I saw no reason to wrap it in a shell archive, as it's just a single file,
- so beware the signature at the end. All documentation is embedded in a large
- comment at the top of the file.
-
- Skip (montanaro@crdgw1.ge.com)
-
- ----------
- /* Everything you wanted to know about your machine and C compiler,
- but didn't know who to ask. */
-
- #ifndef VERSION
- #define VERSION "4.2"
- #endif
-
- /* Author: Steven Pemberton, CWI, Amsterdam; steven@cwi.nl
- Bugfixes and upgrades gratefully received.
-
- Copyright (c) 1988, 1989, 1990 Steven Pemberton, CWI, Amsterdam.
- All rights reserved.
-
- COMPILING
- With luck and a following wind, just the following will work:
- cc config.c -o config
- You may get some messages about unreachable code. This is OK.
-
- If your compiler doesn't support: add flag:
- signed char (eg pcc) -DNO_SC
- unsigned char -DNO_UC
- unsigned short and long -DNO_UI
- void -DNO_VOID
- signal(), or setjmp/longjmp() -DNO_SIG
-
- Try to compile first with no flags, and see if you get any errors -
- you might be surprised. (Most non-ANSI compilers need -DNO_SC, though.)
- Some compilers need a -f flag for floating point.
-
- If your C preprocessor doesn't have the predefined __FILE__ macro, and
- you don't want to call this file config.c but, say, params.c, add the
- flag -D__FILE__=\"params.c\" .
-
- Some naughty compilers define __STDC__, but don't really support it
- (typically they define __STDC__ as 0). If this is the case for you,
- add flag -DNO_STDC. (To those compiler writers: for shame).
-
- Some bad compilers won't accept the line "#include __FILE__" or
- "#ifdef __FILE__". Add flag -DNO_FILE. In that case, this file *must*
- be called config.c.
-
- Don't use any optimisation flags: the program may not work if you do.
- Though "while (a+1.0-a-1.0 == 0.0)" may look like "while(1)" to an
- optimiser, to a floating-point unit there's a world of difference.
-
- Some compilers offer various flags for different floating point
- modes; it's worth trying all possible combinations of these.
-
- Add -DID=\"name\" if you want the machine/flags identified in the output.
-
- While it is not our policy to support defective compilers, pity has been
- taken on people with compilers that can't produce object files bigger than
- 32k (especially since it was an easy addition). Compile the program
- into separate parts like this:
- cc -DSEP -DPASS0 -o p0.o <other flags> config.c
- cc -DSEP -DPASS1 -o p1.o <other flags> config.c
- cc -DSEP -DPASS2 -o p2.o <other flags> config.c
- cc -DSEP -DPASS3 -o p3.o <other flags> config.c
- cc -o config p0.o p1.o p2.o p3.o
-
- SYSTEM DEPENDENCIES
- You may possibly need to add some calls to signal() for other sorts of
- exception on your machine than SIGFPE, and SIGOVER. See lines beginning
- #ifdef SIGxxx in main() (and communicate the differences to me!).
-
- OUTPUT
- Run without argument to get the information as English text. If run
- with argument -l (e.g. config -l), output is a series of #define's for
- the ANSI standard limits.h include file, excluding MB_MAX_CHAR. If run
- with argument -f, output is a series of #define's for the ANSI standard
- float.h include file (according to ANSI C Draft of May 13, 1988).
- Flag -v gives verbose output: output includes the English text above
- as C comments. The program exit(0)'s if everything went ok, otherwise
- it exits with a positive number, telling how many problems there were.
-
- VERIFYING THE COMPILER
- If, having produced the float.h and limits.h header files, you want to
- verify that the compiler reads them back correctly (there are a lot of
- boundary cases, of course, like minimum and maximum numbers), you can
- recompile config.c with -DVERIFY set (plus the other flags that you used
- when compiling the version that produced the header files). This then
- recompiles the program so that it #includes "limits.h" and "float.h",
- and checks that the constants it finds there are the same as the
- constants it produces. Run the resulting program with config -fl.
- Very few compilers have passed without error.
-
- You can also use this option if your compiler already has both files,
- and you want to confirm that this program produces the right results.
-
- TROUBLESHOOTING.
- This program is now quite trustworthy, and suspicious and wrong output
- may well be caused by bugs in the compiler, not in the program (however
- of course, this is not guaranteed, and no responsibility can be
- accepted, etc.)
-
- The program only works if overflows are ignored by the C system or
- are catchable with signal().
-
- If the program fails to run to completion (often with the error message
- "Unexpected signal at point x"), this often turns out to be a bug in the
- C compiler's run-time system. Check what was about to be printed, and
- try to narrow the problem down.
-
- Another possible problem is that you have compiled the program to produce
- loss-of-precision arithmetic traps. The program cannot cope with these,
- and you should re-compile without them. (They should never be the default).
-
- Make sure you compiled with optimisation turned off.
-
- Output preceded by *** WARNING: identifies behaviour of the C system
- deemed incorrect by the program. Likely problems are that printf or
- scanf don't cope properly with certain boundary numbers: this program
- goes to a lot of trouble to calculate its values, and these values
- are mostly boundary numbers. Experience has shown that often printf
- cannot cope with these values, and so in an attempt to increase
- confidence in the output, for each float and double that is printed,
- the printed value is checked by using sscanf to read it back.
- Care is taken that numbers are printed with enough digits to uniquely
- identify them, and therefore that they can be read back identically.
- If the number read back is different, then there is probably a bug in
- printf or sscanf, and the program prints the warning message.
- If the two numbers in the warning look identical, then printf is more
- than likely rounding the last digit(s) incorrectly. To put you at ease
- that the two really are different, the bit patterns of the two numbers
- are also printed. The difference is very likely in the last bit.
- Many scanf's read the minimum double back as 0.0, and similarly cause
- overflow when reading the maximum double. The program quite ruthlessly
- declares all these behaviours faulty. The point is that if you get
- one of these warnings, the output may be wrong, so you should check
- the result carefully if you intend to use the results. Of course, printf
- and sscanf may both be wrong, and cancel each other out, so you should
- check the output carefully anyway.
-
- The warning that "a cast didn't work" refers to cases like this:
-
- float f;
- #define C 1.234567890123456789
- f= C;
- if (f != (float) C) printf ("Wrong!");
-
- A faulty compiler will widen f to double and ignore the cast to float,
- and because there is more accuracy in a double than a float, fail to
- recognise that they are the same. In the actual case in point, f and C
- are passed as parameters to a function that discovers they are not equal,
- so it's just possible that the error was in the parameter passing,
- not in the cast (see function Validate()).
- For ANSI C, which has float constants, the error message is "constant has
- wrong precision".
-
- REPORTING PROBLEMS
- If the program doesn't work for you for any reason that can't be
- narrowed down to a problem in the C compiler, or it has to be changed in
- order to get it to compile, or it produces suspicious output (like a very
- low maximum float, for instance), please mail the problem and an example
- of the incorrect output to steven@cwi.nl or ..!hp4nl!cwi.nl!steven, so that
- improvements can be worked into future versions; cwi.nl is the European
- backbone, and is connected to uunet and other fine hosts.
-
- The program tries to catch and diagnose bugs in the compiler/run-time
- system. I would be especially pleased to have reports of failures so
- that I can improve this service.
-
- I apologise unreservedly for the contorted use of the preprocessor...
-
- THE SMALL PRINT
- You may copy and distribute verbatim copies of this source file.
-
- You may modify this source file, and copy and distribute such
- modified versions, provided that you leave the copyright notice
- at the top of the file and also cause the modified file to carry
- prominent notices stating that you changed the files and the date
- of any change; and cause the whole of any work that you distribute
- or publish, that in whole or in part contains or is a derivative of
- this program or any part thereof, to be licensed at no charge to
- all third parties on terms identical to those here.
-
- If you do have a fix to any problem, please send it to me, so that
- other people can have the benefits.
-
- While every effort has been taken to make this program as reliable as
- possible, no responsibility can be taken for the correctness of the
- output, or suitability for any particular use.
-
- ACKNOWLEDGEMENTS
- Many people have given time and ideas to making this program what it is.
- To all of them thanks, and apologies for not mentioning them by name.
-
- HISTORY
- 4.0 Added -f and -l options, and warnings
- 4.1 Added VERIFY
- 4.2 Added SEP
- Fixed eps/epsneg
- Added check for pseudo-unsigned chars
- Added description for each #define output
- Added check for absence of defines during verify
- Added prototypes
- Added NO_STDC and NO_FILE
- Fixed alignments output
- */
-
- #ifndef NO_FILE
- #ifndef __FILE__
- #define __FILE__ "config.c"
- #endif
- #endif
-
- /* If PASS isn't defined, then this is the first pass over this file. */
- #ifndef PASS
- #ifndef SEP
- #define PASS 1
- #define PASS0 1
- #define PASS1 1
- #endif /* SEP */
-
- /* A description of the ANSI constants */
- #define D_CHAR_BIT "Number of bits in a storage unit"
- #define D_CHAR_MAX "Maximum char"
- #define D_CHAR_MIN "Minimum char"
- #define D_SCHAR_MAX "Maximum signed char"
- #define D_SCHAR_MIN "Minimum signed char"
- #define D_UCHAR_MAX "Maximum unsigned char (minimum is always 0)"
-
- #define D_INT_MAX "Maximum %s"
- #define D_INT_MIN "Minimum %s"
- #define D_UINT_MAX "Maximum unsigned %s (minimum is always 0)"
-
- #define D_FLT_ROUNDS "Addition rounds to 0: zero, 1: nearest, 2: +inf, 3: -inf, -1: unknown"
- #define D_FLT_RADIX "Radix of exponent representation"
- #define D_MANT_DIG "Number of base-FLT_RADIX digits in the mantissa of a %s"
- #define D_DIG "Number of decimal digits of precision in a %s"
- #define D_MIN_EXP "Minimum int x such that FLT_RADIX**(x-1) is a normalised %s"
- #define D_MIN_10_EXP "Minimum int x such that 10**x is a normalised %s"
- #define D_MAX_EXP "Maximum int x such that FLT_RADIX**(x-1) is a representable %s"
- #define D_MAX_10_EXP "Maximum int x such that 10**x is a representable %s"
- #define D_MAX "Maximum %s"
- #define D_EPSILON "Minimum %s x such that 1.0+x != 1.0"
- #define D_MIN "Minimum normalised %s"
-
- /* Procedure just marks the functions that don't return a result */
- #ifdef NO_VOID
- #define Procedure int
- #else
- #define Procedure void
- #endif
-
- /* Some bad compilers define __STDC__, when they don't support it.
- Compile with -DNO_STDC to get round this.
- */
- #ifndef NO_STDC
- #ifdef __STDC__
- #define STDC
- #endif
- #endif
-
- /* Stuff different for ANSI C, and old C:
- ARGS and NOARGS are used for function prototypes.
- Volatile is used to reduce the chance of optimisation,
- and to prevent variables being put in registers (when setjmp/longjmp
- wouldn't work as we want)
- Long_double is the longest floating point type available.
- stdc is used in tests like "if (stdc)", which is less ugly than #ifdef.
- U is output after unsigned constants.
- */
- #ifdef STDC
-
- #define ARGS(x) x
- #define NOARGS (void)
- #define Volatile volatile
- #define Long_double long double
- #define stdc 1
- #define U "U"
-
- #else /* Old style C */
-
- #define ARGS(x) ()
- #define NOARGS ()
- #define Volatile static
- #define Long_double double
- #define stdc 0
- #define U ""
-
- #endif /* STDC */
-
- /* include files */
- #include <stdio.h>
-
- #ifdef NO_SIG
- #define jmp_buf int
- #else
- #include <signal.h>
- #include <setjmp.h>
- #endif
-
- #ifdef VERIFY
- #include "limits.h"
- #include "float.h"
- #endif
-
- #define Vprintf if (V) printf
- #define Unexpected(place) if (setjmp(lab)!=0) croak(place)
- #define fabs(x) (((x)<0.0)?(-x):(x))
-
- #endif /* PASS */
-
- #ifdef PASS0
-
- /* Prototypes for what's to come: */
-
- char *malloc ARGS((unsigned size));
- Procedure exit ARGS((int status));
-
- char *f_rep ARGS((int precision, Long_double val));
-
- int cprop NOARGS;
- int basic NOARGS;
- Procedure sprop NOARGS;
- Procedure iprop NOARGS;
- Procedure lprop NOARGS;
- Procedure usprop NOARGS;
- Procedure uiprop NOARGS;
- Procedure ulprop NOARGS;
- int fprop ARGS((int bits_per_byte));
- int dprop ARGS((int bits_per_byte));
- int ldprop ARGS((int bits_per_byte));
- Procedure efprop ARGS((int fprec, int dprec, int lprec));
- Procedure edprop ARGS((int fprec, int dprec, int lprec));
- Procedure eldprop ARGS((int fprec, int dprec, int lprec));
-
- int setmode ARGS((char *s));
- Procedure farewell ARGS((int bugs));
- Procedure describe ARGS((char *description, char *extra));
- Procedure check_defines NOARGS;
- Procedure bitpattern ARGS((char *p, unsigned int size));
- int ceil_log ARGS((int base, Long_double x));
- Procedure croak ARGS((int place));
- Procedure eek_a_bug ARGS((char *problem));
- Procedure endian ARGS((int bits_per_byte));
- int exponent ARGS((Long_double x, double *fract, int *exp));
- int floor_log ARGS((int base, Long_double x));
- Procedure f_define ARGS((char *desc, char *extra, char *sort, char *name,
- int prec, Long_double val, char *mark));
- Procedure i_define ARGS((char *desc, char *extra, char *sort, char *name,
- long val, long req, char *mark));
- Procedure u_define ARGS((char *desc, char *extra, char *sort, char *name,
- unsigned long val, unsigned long req, char *mark));
-
- #ifdef NO_SIG /* There's no signal(), or setjmp/longjmp() */
-
- /* Dummy routines instead */
-
- Procedure setjmp ARGS((int lab));
-
- int lab=1;
- int setjmp(lab) int lab; { return(0); }
- Procedure signal(i, p) int i, (*p)(); {}
-
- #else
- jmp_buf lab;
- Procedure overflow(sig) int sig; { /* what to do on over/underflow */
- signal(sig, overflow);
- longjmp(lab, 1);
- }
-
- #endif /*NO_SIG*/
-
- int V= 0, /* verbose */
- L= 0, /* produce limits.h */
- F= 0, /* produce float.h */
- bugs=0; /* The number of (possible) bugs in the output */
-
- char co[4], oc[4]; /* Comment starter and ender symbols */
-
- int bits_per_byte; /* the number of bits per unit returned by sizeof() */
- int flt_rounds; /* The calculated value of FLT_ROUNDS */
- int flt_radix; /* The calculated value of FLT_RADIX */
-
- #ifdef TEST
- /* Set the fp modes on a SUN with 68881 chip, to check that different
- rounding modes etc. get properly detected.
- Compile with additional flag -DTEST, and run with additional parameter
- +hex-number, to set the 68881 mode register to hex-number
- */
-
- /* Bits 0x30 = rounding mode: */
- #define ROUND_BITS 0x30
- #define TO_NEAREST 0x00
- #define TO_ZERO 0x10
- #define TO_MINUS_INF 0x20
- #define TO_PLUS_INF 0x30 /* The SUN FP user's guide seems to be wrong here */
-
- /* Bits 0xc0 = extended rounding: */
- #define EXT_BITS 0xc0
- #define ROUND_EXTENDED 0x00
- #define ROUND_SINGLE 0x40
- #define ROUND_DOUBLE 0x80
-
- /* Enabled traps: */
- #define EXE_INEX1 0x100
- #define EXE_INEX2 0x200
- #define EXE_DZ 0x400
- #define EXE_UNFL 0x800
- #define EXE_OVFL 0x1000
- #define EXE_OPERR 0x2000
- #define EXE_SNAN 0x4000
- #define EXE_BSUN 0x8000
-
- /* Only used for testing, on a Sun with 68881 chip */
- /* Print the FP mode */
- printmode(new) unsigned new; {
- fpmode_(&new);
- printf("New fp mode:\n");
- printf(" Round toward ");
- switch (new & ROUND_BITS) {
- case TO_NEAREST: printf("nearest"); break;
- case TO_ZERO: printf("zero"); break;
- case TO_MINUS_INF: printf("minus infinity"); break;
- case TO_PLUS_INF: printf("plus infinity"); break;
- default: printf("???"); break;
- }
-
- printf("\n Extended rounding precision: ");
-
- switch (new & EXT_BITS) {
- case ROUND_EXTENDED: printf("extended"); break;
- case ROUND_SINGLE: printf("single"); break;
- case ROUND_DOUBLE: printf("double"); break;
- default: printf("???"); break;
- }
-
- printf("\n Enabled exceptions:");
- if (new & (unsigned) EXE_INEX1) printf(" inex1");
- if (new & (unsigned) EXE_INEX2) printf(" inex2");
- if (new & (unsigned) EXE_DZ) printf(" dz");
- if (new & (unsigned) EXE_UNFL) printf(" unfl");
- if (new & (unsigned) EXE_OVFL) printf(" ovfl");
- if (new & (unsigned) EXE_OPERR) printf(" operr");
- if (new & (unsigned) EXE_SNAN) printf(" snan");
- if (new & (unsigned) EXE_BSUN) printf(" bsun");
- printf("\n");
- }
-
- /* Only used for testing, on a Sun with 68881 chip */
- /* Set the FP mode */
- int setmode(s) char *s; {
- unsigned mode=0, dig;
- char c;
-
- while (*s) {
- c= *s++;
- if (c>='0' && c<='9') dig= c-'0';
- else if (c>='a' && c<='f') dig= c-'a'+10;
- else if (c>='A' && c<='F') dig= c-'A'+10;
- else return 1;
- mode= mode<<4 | dig;
- }
- printmode(mode);
- return 0;
- }
- #else
- int setmode(s) char *s; {
- fprintf(stderr, "Can't set mode: not compiled with TEST\n");
- return(1);
- }
- #endif
-
- Procedure farewell(bugs) int bugs; {
- if (bugs > 0) {
- printf("\n%sFor hints on dealing with the problems above", co);
- printf("\n see the section 'TROUBLESHOOTING' in the file ");
- printf("%s%s\n", __FILE__, oc);
- }
- exit(bugs);
- }
-
- /* The program has received a signal where it wasn't expecting one */
- Procedure croak(place) int place; {
- printf("*** Unexpected signal at point %d\n", place);
- farewell(bugs+1); /* An exit isn't essential here, but avoids loops */
- }
-
- main(argc, argv) int argc; char *argv[]; {
- int dprec, fprec, lprec;
- unsigned int size;
- long total;
- int i; char *s; int bad;
-
- #ifdef SIGFPE
- signal(SIGFPE, overflow);
- #endif
- #ifdef SIGOVER
- signal(SIGOVER, overflow);
- #endif
- /* Add more calls as necessary */
-
- Unexpected(1);
-
- bad=0;
- for (i=1; i < argc; i++) {
- s= argv[i];
- if (*s == '-') {
- s++;
- while (*s) {
- switch (*(s++)) {
- case 'v': V=1; break;
- case 'l': L=1; break;
- case 'f': F=1; break;
- default: bad=1; break;
- }
- }
- } else if (*s == '+') {
- s++;
- bad= setmode(s);
- } else bad= 1;
- }
- if (bad) {
- fprintf(stderr,
- "Usage: %s [-vlf]\n v=Verbose l=Limits.h f=Float.h\n",
- argv[0]);
- exit(1);
- }
- if (L || F) {
- co[0]= '/'; oc[0]= ' ';
- co[1]= '*'; oc[1]= '*';
- co[2]= ' '; oc[2]= '/';
- co[3]= '\0'; oc[3]= '\0';
- } else {
- co[0]= '\0'; oc[0]= '\0';
- V=1;
- }
-
- if (L) printf("%slimits.h%s\n", co, oc);
- if (F) printf("%sfloat.h%s\n", co, oc);
- #ifdef ID
- printf("%sProduced on %s by config version %s, CWI, Amsterdam%s\n",
- co, ID, VERSION, oc);
- #else
- printf("%sProduced by config version %s, CWI, Amsterdam%s\n",
- co, VERSION, oc);
- #endif
-
- #ifdef VERIFY
- printf("%sVerification phase%s\n", co, oc);
- #endif
-
- #ifdef NO_SIG
- Vprintf("%sCompiled without signal(): %s%s\n",
- co,
- "there's nothing that can be done if overflow occurs",
- oc);
- #endif
- #ifdef NO_SC
- Vprintf("%sCompiled without signed char%s\n", co, oc);
- #endif
- #ifdef NO_UC
- Vprintf("%Compiled without unsigned char%s\n", co, oc);
- #endif
- #ifdef NO_UI
- Vprintf("%Compiled without unsigned short or long%s\n", co, oc);
- #endif
- #ifdef __STDC__
- Vprintf("%sCompiler claims to be ANSI C level %d%s\n",
- co, __STDC__, oc);
- #else
- Vprintf("%sCompiler does not claim to be ANSI C%s\n", co, oc);
- #endif
- printf("\n");
- check_defines();
-
- bits_per_byte= basic();
- Vprintf("\n");
- if (F||V) {
- fprec= fprop(bits_per_byte);
- dprec= dprop(bits_per_byte);
- lprec= ldprop(bits_per_byte);
- efprop(fprec, dprec, lprec);
- edprop(fprec, dprec, lprec);
- eldprop(fprec, dprec, lprec);
- }
- if (V) {
- /* An extra goody: the approximate amount of data-space */
- /* Allocate store until no more available */
- size=1<<((bits_per_byte*sizeof(int))-2);
- total=0;
- while (size!=0) {
- while (malloc(size)!=(char *)NULL) total+=(size/2);
- size/=2;
- }
-
- Vprintf("%sMemory mallocatable ~= %ld Kbytes%s\n",
- co, (total+511)/512, oc);
- }
- farewell(bugs);
- return bugs; /* To keep compilers and lint happy */
- }
-
- Procedure eek_a_bug(problem) char *problem; {
- /* The program has discovered a problem */
- printf("\n%s*** WARNING: %s%s\n", co, problem, oc);
- bugs++;
- }
-
- Procedure describe(description, extra) char *description, *extra; {
- /* Produce the description for a #define */
- printf(" %s", co);
- printf(description, extra);
- printf("%s\n", oc);
- }
-
- Procedure i_define(desc, extra, sort, name, val, req, mark)
- char *desc, *extra, *sort, *name; long val, req; char *mark; {
- /* Produce a #define for a signed int type */
- describe(desc, extra);
- if (val >= 0) {
- printf("#define %s%s %ld%s\n", sort, name, val, mark);
- } else {
- printf("#define %s%s (%ld%s)\n", sort, name, val, mark);
- }
- if (val != req) {
- printf("%s*** Verify failed for above #define!\n", co);
- printf(" Compiler has %ld for value%s\n\n", req, oc);
- bugs++;
- }
- Vprintf("\n");
- }
-
- Procedure u_define(desc, extra, sort, name, val, req, mark)
- char *desc, *extra, *sort, *name; unsigned long val, req; char *mark; {
- /* Produce a #define for an unsigned value */
- describe(desc, extra);
- printf("#define %s%s %lu%s%s\n", sort, name, val, U, mark);
- if (val != req) {
- printf("%s*** Verify failed for above #define!\n", co);
- printf(" Compiler has %lu for value%s\n\n", req, oc);
- bugs++;
- }
- Vprintf("\n");
- }
-
- Procedure f_define(desc, extra, sort, name, precision, val, mark)
- char *desc, *extra, *sort, *name; int precision;
- Long_double val; char *mark; {
- /* Produce a #define for a float/double/long double */
- describe(desc, extra);
- if (stdc) {
- printf("#define %s%s %s%s\n",
- sort, name, f_rep(precision, val), mark);
- } else if (*mark == 'F') {
- /* non-ANSI C has no float constants, so cast the constant */
- printf("#define %s%s ((float)%s)\n",
- sort, name, f_rep(precision, val));
- } else {
- printf("#define %s%s %s\n", sort, name, f_rep(precision, val));
- }
- Vprintf("\n");
- }
-
- int floor_log(base, x) int base; Long_double x; {
- /* return floor(log base(x)) */
- int r=0;
- while (x>=base) { r++; x/=base; }
- return r;
- }
-
- int ceil_log(base, x) int base; Long_double x; {
- int r=0;
- while (x>1.0) { r++; x/=base; }
- return r;
- }
-
- int exponent(x, fract, exp) Long_double x; double *fract; int *exp; {
- /* Split x into a fraction and a power of ten;
- returns 0 if x is unusable, 1 otherwise.
- Only used for error messages about faulty output.
- */
- int r=0, neg=0;
- Long_double old;
- *fract=0.0; *exp=0;
- if (x<0.0) {
- x= -x;
- neg= 1;
- }
- if (x==0.0) return 1;
- if (x>=10.0) {
- while (x>=10.0) {
- old=x; r++; x/=10.0;
- if (old==x) return 0;
- }
- } else {
- while (x<1.0) {
- old=x; r--; x*=10.0;
- if (old==x) return 0;
- }
- }
- if (neg) *fract= -x;
- else *fract=x;
- *exp=r;
- return 1;
- }
-
- char *f_rep(precision, val) int precision; Long_double val; {
- /* Return the floating representation of val */
- static char buf[1024];
- char *f1;
- if (sizeof(double) == sizeof(Long_double)) {
- /* Assume they're the same, and use non-stdc format */
- /* This is for stdc compilers using non-stdc libraries */
- f1= "%.*e";
- } else {
- /* It had better support Le then */
- f1= "%.*Le";
- }
- sprintf(buf, f1, precision, val);
- return buf;
- }
-
- Procedure bitpattern(p, size) char *p; unsigned int size; {
- /* Printf the bit-pattern of p */
- char c;
- int i, j;
-
- for (i=1; i<=size; i++) {
- c= *p;
- p++;
- for (j=bits_per_byte-1; j>=0; j--)
- printf("%c", (c>>j)&1 ? '1' : '0');
- if (i!=size) printf(" ");
- }
- }
-
- #define Order(x, px, mode)\
- printf("%s %s ", co, mode); for (i=0; i<sizeof(x); i++) px[i]= c[i]; \
- for (i=1; i<=sizeof(x); i++) { putchar((char)((x>>(bits_per_byte*(sizeof(x)-i)))&mask)); }\
- printf("%s\n", oc);
-
- Procedure endian(bits_per_byte) int bits_per_byte; {
- /* Printf the byte-order used on this machine */
- /*unsigned*/ short s=0;
- /*unsigned*/ int j=0;
- /*unsigned*/ long l=0;
-
- char *ps= (char *) &s,
- *pj= (char *) &j,
- *pl= (char *) &l,
- *c= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- unsigned int mask, i;
-
- mask=0;
- for (i=1; i<=(unsigned)bits_per_byte; i++) mask= (mask<<1)|1;
-
- if (V) {
- printf("%sCharacter order:%s\n", co, oc);
- Order(s, ps, "short:");
- Order(j, pj, "int: ");
- Order(l, pl, "long: ");
- }
- }
-
- Procedure check_defines() {
- /* ensure that all the #defines are present */
- #ifdef VERIFY
- if (L) {
- #ifndef CHAR_BIT
- printf("%s*** CHAR_BIT missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef CHAR_MAX
- printf("%s*** CHAR_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef CHAR_MIN
- printf("%s*** CHAR_MIN missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef SCHAR_MAX
- printf("%s*** SCHAR_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef SCHAR_MIN
- printf("%s*** SCHAR_MIN missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef UCHAR_MAX
- printf("%s*** UCHAR_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef SHRT_MAX
- printf("%s*** SHRT_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef SHRT_MIN
- printf("%s*** SHRT_MIN missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef INT_MAX
- printf("%s*** INT_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef INT_MIN
- printf("%s*** INT_MIN missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LONG_MAX
- printf("%s*** LONG_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LONG_MIN
- printf("%s*** LONG_MIN missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef USHRT_MAX
- printf("%s*** USHRT_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef UINT_MAX
- printf("%s*** UINT_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- #ifndef ULONG_MAX
- printf("%s*** ULONG_MAX missing from limits.h%s\n", co, oc); bugs++;
- #endif
- } /* if (L) */
-
- if (F) {
- #ifndef FLT_RADIX
- printf("%s*** FLT_RADIX missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MANT_DIG
- printf("%s*** FLT_MANT_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_DIG
- printf("%s*** FLT_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_ROUNDS
- printf("%s*** FLT_ROUNDS missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_EPSILON
- printf("%s*** FLT_EPSILON missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MIN_EXP
- printf("%s*** FLT_MIN_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MIN
- printf("%s*** FLT_MIN missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MIN_10_EXP
- printf("%s*** FLT_MIN_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MAX_EXP
- printf("%s*** FLT_MAX_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MAX
- printf("%s*** FLT_MAX missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef FLT_MAX_10_EXP
- printf("%s*** FLT_MAX_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MANT_DIG
- printf("%s*** DBL_MANT_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_DIG
- printf("%s*** DBL_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_EPSILON
- printf("%s*** DBL_EPSILON missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MIN_EXP
- printf("%s*** DBL_MIN_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MIN
- printf("%s*** DBL_MIN missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MIN_10_EXP
- printf("%s*** DBL_MIN_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MAX_EXP
- printf("%s*** DBL_MAX_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MAX
- printf("%s*** DBL_MAX missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef DBL_MAX_10_EXP
- printf("%s*** DBL_MAX_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifdef STDC
- #ifndef LDBL_MANT_DIG
- printf("%s*** LDBL_MANT_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_DIG
- printf("%s*** LDBL_DIG missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_EPSILON
- printf("%s*** LDBL_EPSILON missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MIN_EXP
- printf("%s*** LDBL_MIN_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MIN
- printf("%s*** LDBL_MIN missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MIN_10_EXP
- printf("%s*** LDBL_MIN_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MAX_EXP
- printf("%s*** LDBL_MAX_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MAX
- printf("%s*** LDBL_MAX missing from float.h%s\n", co, oc); bugs++;
- #endif
- #ifndef LDBL_MAX_10_EXP
- printf("%s*** LDBL_MAX_10_EXP missing from float.h%s\n", co, oc); bugs++;
- #endif
- #endif /* STDC */
- } /* if (F) */
- #endif /* VERIFY */
- }
-
- #ifdef VERIFY
- #ifndef SCHAR_MAX
- #define SCHAR_MAX char_max
- #endif
- #ifndef SCHAR_MIN
- #define SCHAR_MIN char_min
- #endif
- #ifndef UCHAR_MAX
- #define UCHAR_MAX char_max
- #endif
- #endif /* VERIFY */
-
- #ifndef CHAR_BIT
- #define CHAR_BIT char_bit
- #endif
- #ifndef CHAR_MAX
- #define CHAR_MAX char_max
- #endif
- #ifndef CHAR_MIN
- #define CHAR_MIN char_min
- #endif
- #ifndef SCHAR_MAX
- #define SCHAR_MAX char_max
- #endif
- #ifndef SCHAR_MIN
- #define SCHAR_MIN char_min
- #endif
- #ifndef UCHAR_MAX
- #define UCHAR_MAX char_max
- #endif
-
- int cprop() {
- /* Properties of type char */
- Volatile char c, char_max, char_min;
- Volatile int bits_per_byte, is_signed;
- long char_bit;
-
- Unexpected(2);
-
- /* Calculate number of bits per character *************************/
- c=1; bits_per_byte=0;
- do { c=c<<1; bits_per_byte++; } while(c!=0);
- c= (char)(-1);
- if (((int)c)<0) is_signed=1;
- else is_signed=0;
- Vprintf("%sChar = %d bits, %ssigned%s\n",
- co, (int)sizeof(c)*bits_per_byte, (is_signed?"":"un"), oc);
- char_bit=(long)(sizeof(c)*bits_per_byte);
- if (L) i_define(D_CHAR_BIT, "",
- "CHAR", "_BIT", char_bit, (long) CHAR_BIT, "");
-
- c=0; char_max=0;
- c++;
- if (setjmp(lab)==0) { /* Yields char_max */
- while (c>char_max) {
- char_max=c;
- c++;
- }
- } else {
- Vprintf("%sCharacter overflow generates a trap!%s\n", co, oc);
- }
- c=0; char_min=0;
- c--;
- if (setjmp(lab)==0) { /* Yields char_min */
- while (c<char_min) {
- char_min=c;
- c--;
- }
- }
- if (is_signed && char_min == 0) {
- Vprintf("%sBEWARE! Chars are pseudo-unsigned:%s\n", co, oc);
- Vprintf("%s %s%s%s\n",
- "They contain only nonnegative values, ",
- "but sign extend when used as integers.", co, oc);
- }
- Unexpected(3);
-
- if (L) {
- i_define(D_CHAR_MAX, "",
- "CHAR", "_MAX", (long) char_max, (long) CHAR_MAX, "");
- i_define(D_CHAR_MIN, "",
- "CHAR", "_MIN", (long) char_min, (long) CHAR_MIN, "");
- if (is_signed) {
- i_define(D_SCHAR_MAX, "",
- "SCHAR", "_MAX", (long) char_max,
- (long) SCHAR_MAX, "");
- i_define(D_SCHAR_MIN, "",
- "SCHAR", "_MIN", (long) char_min,
- (long) SCHAR_MIN, "");
- } else {
- i_define(D_UCHAR_MAX, "",
- "UCHAR", "_MAX", (long) char_max,
- (long) UCHAR_MAX, "");
- }
-
- if (is_signed) {
- #ifndef NO_UC
- Volatile unsigned char c, char_max;
- c=0; char_max=0;
- c++;
- if (setjmp(lab)==0) { /* Yields char_max */
- while (c>char_max) {
- char_max=c;
- c++;
- }
- }
- Unexpected(4);
- i_define(D_UCHAR_MAX, "",
- "UCHAR", "_MAX", (long) char_max,
- (long) UCHAR_MAX, "");
- #endif
- } else {
- #ifndef NO_SC /* Define NO_SC if the next line gives a syntax error */
- Volatile signed char c, char_max, char_min;
- c=0; char_max=0;
- c++;
- if (setjmp(lab)==0) { /* Yields char_max */
- while (c>char_max) {
- char_max=c;
- c++;
- }
- }
- c=0; char_min=0;
- c--;
- if (setjmp(lab)==0) { /* Yields char_min */
- while (c<char_min) {
- char_min=c;
- c--;
- }
- }
- Unexpected(5);
- i_define(D_SCHAR_MIN, "",
- "SCHAR", "_MIN", (long) char_min,
- (long) SCHAR_MIN, "");
- i_define(D_SCHAR_MAX, "",
- "SCHAR", "_MAX", (long) char_max,
- (long) SCHAR_MAX, "");
- #endif /* NO_SC */
- }
- }
- return bits_per_byte;
- }
-
- int basic() {
- /* The properties of the basic types.
- Returns number of bits per sizeof unit */
- Volatile int bits_per_byte;
- struct{char i1; char c1;} schar;
- struct{short i2; char c2;} sshort;
- struct{int i3; char c3;} sint;
- struct{long i4; char c4;} slong;
-
- bits_per_byte= cprop();
-
- /* Shorts, ints and longs *****************************************/
- Vprintf("%sShort=%d int=%d long=%d float=%d double=%d bits %s\n",
- co,
- (int) sizeof(short)*bits_per_byte,
- (int) sizeof(int)*bits_per_byte,
- (int) sizeof(long)*bits_per_byte,
- (int) sizeof(float)*bits_per_byte,
- (int) sizeof(double)*bits_per_byte, oc);
- if (stdc) {
- Vprintf("%sLong double=%d bits%s\n",
- co, (int) sizeof(Long_double)*bits_per_byte, oc);
- }
- Vprintf("%sChar pointers = %d bits%s%s\n",
- co, (int)sizeof(char *)*bits_per_byte,
- sizeof(char *)>sizeof(int)?" BEWARE! larger than int!":"",
- oc);
- Vprintf("%sInt pointers = %d bits%s%s\n",
- co, (int)sizeof(int *)*bits_per_byte,
- sizeof(int *)>sizeof(int)?" BEWARE! larger than int!":"",
- oc);
-
- /* Alignment constants ********************************************/
- Vprintf("%sAlignments used for char=%ld short=%ld int=%ld long=%ld%s\n",
- co,
- ((long)&schar.c1)-((long)&schar.i1),
- ((long)&sshort.c2)-((long)&sshort.i2),
- ((long)&sint.c3)-((long)&sint.i3),
- ((long)&slong.c4)-((long)&slong.i4),
- oc);
-
- /* Ten little endians *********************************************/
-
- endian(bits_per_byte);
-
- /* Pointers *******************************************************/
- if (V) {
- if ("abcd"=="abcd")
- printf("%sStrings are shared%s\n", co, oc);
- else printf("%sStrings are not shared%s\n", co, oc);
- }
-
- sprop();
- iprop();
- lprop();
- usprop();
- uiprop();
- ulprop();
-
- Unexpected(6);
-
- return bits_per_byte;
- }
-
- #else /* not PASS0 */
-
- #ifdef SEP
- extern jmp_buf lab;
- extern int V, L, F, bugs, bits_per_byte;
- extern char co[], oc[];
- extern char *f_rep();
- #endif /* SEP */
- #endif /* ifdef PASS0 */
-
- /* As I said, I apologise for the contortions below. The functions are
- expanded by the preprocessor twice or three times (for float and double,
- and maybe for long double, and for short, int and long). That way,
- I never make a change to one that I forget to make to the other.
- You can look on it as C's fault for not supporting multi-line macro's.
- This whole file is read 3 times by the preprocessor, with PASSn set for
- n=1, 2 or 3, to decide which parts to reprocess.
- */
-
- /* #undef on an already undefined thing is (wrongly) flagged as an error
- by some compilers, therefore the #ifdef that follows:
- */
- #ifdef Number
- #undef Number
- #undef THING
- #undef Thing
- #undef thing
- #undef FPROP
- #undef Fname
- #undef Store
- #undef Sum
- #undef Diff
- #undef Mul
- #undef Div
- #undef ZERO
- #undef HALF
- #undef ONE
- #undef TWO
- #undef THREE
- #undef FOUR
- #undef Self
- #undef F_check
- #undef Validate
- #undef EPROP
- #undef MARK
-
- /* These are the float.h constants */
- #undef F_RADIX
- #undef F_MANT_DIG
- #undef F_DIG
- #undef F_ROUNDS
- #undef F_EPSILON
- #undef F_MIN_EXP
- #undef F_MIN
- #undef F_MIN_10_EXP
- #undef F_MAX_EXP
- #undef F_MAX
- #undef F_MAX_10_EXP
- #endif
-
- #ifdef Integer
- #undef Integer
- #undef INT
- #undef IPROP
- #undef Iname
- #undef UPROP
- #undef Uname
- #undef OK_UI
- #undef IMARK
-
- #undef I_MAX
- #undef I_MIN
- #undef U_MAX
- #endif
-
- #ifdef PASS1
-
- /* Define the things we're going to use this pass */
-
- #define Number float
- #define THING "FLOAT"
- #define Thing "Float"
- #define thing "float"
- #define Fname "FLT"
- #define FPROP fprop
- #define Store fStore
- #define Sum fSum
- #define Diff fDiff
- #define Mul fMul
- #define Div fDiv
- #define ZERO 0.0
- #define HALF 0.5
- #define ONE 1.0
- #define TWO 2.0
- #define THREE 3.0
- #define FOUR 4.0
- #define Self fSelf
- #define F_check fCheck
- #define MARK "F"
- #ifdef VERIFY
- #define Validate(prec, val, req, same) fValidate(prec, val, req, same)
- #endif
-
- #define EPROP efprop
-
- #define Integer short
- #define INT "short"
- #define IPROP sprop
- #define Iname "SHRT"
- #ifndef NO_UI
- #define OK_UI 1
- #endif
- #define IMARK ""
-
- #define UPROP usprop
- #define Uname "USHRT"
-
- #ifdef VERIFY
- #ifdef SHRT_MAX
- #define I_MAX SHRT_MAX
- #endif
- #ifdef SHRT_MIN
- #define I_MIN SHRT_MIN
- #endif
- #ifdef USHRT_MAX
- #define U_MAX USHRT_MAX
- #endif
-
- #ifdef FLT_RADIX
- #define F_RADIX FLT_RADIX
- #endif
- #ifdef FLT_MANT_DIG
- #define F_MANT_DIG FLT_MANT_DIG
- #endif
- #ifdef FLT_DIG
- #define F_DIG FLT_DIG
- #endif
- #ifdef FLT_ROUNDS
- #define F_ROUNDS FLT_ROUNDS
- #endif
- #ifdef FLT_EPSILON
- #define F_EPSILON FLT_EPSILON
- #endif
- #ifdef FLT_MIN_EXP
- #define F_MIN_EXP FLT_MIN_EXP
- #endif
- #ifdef FLT_MIN
- #define F_MIN FLT_MIN
- #endif
- #ifdef FLT_MIN_10_EXP
- #define F_MIN_10_EXP FLT_MIN_10_EXP
- #endif
- #ifdef FLT_MAX_EXP
- #define F_MAX_EXP FLT_MAX_EXP
- #endif
- #ifdef FLT_MAX
- #define F_MAX FLT_MAX
- #endif
- #ifdef FLT_MAX_10_EXP
- #define F_MAX_10_EXP FLT_MAX_10_EXP
- #endif
- #endif /* VERIFY */
-
- #endif /* PASS1 */
-
- #ifdef PASS2
-
- #define Number double
- #define THING "DOUBLE"
- #define Thing "Double"
- #define thing "double"
- #define Fname "DBL"
- #define FPROP dprop
- #define Store dStore
- #define Sum dSum
- #define Diff dDiff
- #define Mul dMul
- #define Div dDiv
- #define ZERO 0.0
- #define HALF 0.5
- #define ONE 1.0
- #define TWO 2.0
- #define THREE 3.0
- #define FOUR 4.0
- #define Self dSelf
- #define F_check dCheck
- #define MARK ""
- #ifdef VERIFY
- #define Validate(prec, val, req, same) dValidate(prec, val, req, same)
- #endif
-
- #define EPROP edprop
-
- #define Integer int
- #define INT "int"
- #define IPROP iprop
- #define Iname "INT"
- #define OK_UI 1 /* Unsigned int is always possible */
- #define IMARK ""
-
- #define UPROP uiprop
- #define Uname "UINT"
-
- #ifdef VERIFY
- #ifdef INT_MAX
- #define I_MAX INT_MAX
- #endif
- #ifdef INT_MIN
- #define I_MIN INT_MIN
- #endif
- #ifdef UINT_MAX
- #define U_MAX UINT_MAX
- #endif
-
- #ifdef DBL_MANT_DIG
- #define F_MANT_DIG DBL_MANT_DIG
- #endif
- #ifdef DBL_DIG
- #define F_DIG DBL_DIG
- #endif
- #ifdef DBL_EPSILON
- #define F_EPSILON DBL_EPSILON
- #endif
- #ifdef DBL_MIN_EXP
- #define F_MIN_EXP DBL_MIN_EXP
- #endif
- #ifdef DBL_MIN
- #define F_MIN DBL_MIN
- #endif
- #ifdef DBL_MIN_10_EXP
- #define F_MIN_10_EXP DBL_MIN_10_EXP
- #endif
- #ifdef DBL_MAX_EXP
- #define F_MAX_EXP DBL_MAX_EXP
- #endif
- #ifdef DBL_MAX
- #define F_MAX DBL_MAX
- #endif
- #ifdef DBL_MAX_10_EXP
- #define F_MAX_10_EXP DBL_MAX_10_EXP
- #endif
- #endif /* VERIFY */
-
- #endif /* PASS2 */
-
- #ifdef PASS3
-
- #ifdef STDC
- #define Number long double
- #endif
-
- #define THING "LONG DOUBLE"
- #define Thing "Long double"
- #define thing "long double"
- #define Fname "LDBL"
- #define FPROP ldprop
- #define Store ldStore
- #define Sum ldSum
- #define Diff ldDiff
- #define Mul ldMul
- #define Div ldDiv
- #define ZERO 0.0L
- #define HALF 0.5L
- #define ONE 1.0L
- #define TWO 2.0L
- #define THREE 3.0L
- #define FOUR 4.0L
- #define Self ldSelf
- #define F_check ldCheck
- #define MARK "L"
- #ifdef VERIFY
- #define Validate(prec, val, req, same) ldValidate(prec, val, req, same)
- #endif
-
- #define EPROP eldprop
-
- #define Integer long
- #define INT "long"
- #define IPROP lprop
- #define Iname "LONG"
- #ifndef NO_UI
- #define OK_UI 1
- #endif
- #define IMARK "L"
-
- #define UPROP ulprop
- #define Uname "ULONG"
-
- #ifdef VERIFY
- #ifdef LONG_MAX
- #define I_MAX LONG_MAX
- #endif
- #ifdef LONG_MIN
- #define I_MIN LONG_MIN
- #endif
- #ifdef ULONG_MAX
- #define U_MAX ULONG_MAX
- #endif
-
- #ifdef LDBL_MANT_DIG
- #define F_MANT_DIG LDBL_MANT_DIG
- #endif
- #ifdef LDBL_DIG
- #define F_DIG LDBL_DIG
- #endif
- #ifdef LDBL_EPSILON
- #define F_EPSILON LDBL_EPSILON
- #endif
- #ifdef LDBL_MIN_EXP
- #define F_MIN_EXP LDBL_MIN_EXP
- #endif
- #ifdef LDBL_MIN
- #define F_MIN LDBL_MIN
- #endif
- #ifdef LDBL_MIN_10_EXP
- #define F_MIN_10_EXP LDBL_MIN_10_EXP
- #endif
- #ifdef LDBL_MAX_EXP
- #define F_MAX_EXP LDBL_MAX_EXP
- #endif
- #ifdef LDBL_MAX
- #define F_MAX LDBL_MAX
- #endif
- #ifdef LDBL_MAX_10_EXP
- #define F_MAX_10_EXP LDBL_MAX_10_EXP
- #endif
- #endif /* VERIFY */
-
- #endif /* PASS3 */
-
- #ifndef I_MAX
- #define I_MAX int_max
- #endif
- #ifndef I_MIN
- #define I_MIN int_min
- #endif
- #ifndef U_MAX
- #define U_MAX int_max
- #endif
-
- #ifndef F_RADIX
- #define F_RADIX f_radix
- #endif
- #ifndef F_MANT_DIG
- #define F_MANT_DIG f_mant_dig
- #endif
- #ifndef F_DIG
- #define F_DIG f_dig
- #endif
- #ifndef F_ROUNDS
- #define F_ROUNDS f_rounds
- #endif
- #ifndef F_EPSILON
- #define F_EPSILON f_epsilon
- #endif
- #ifndef F_MIN_EXP
- #define F_MIN_EXP f_min_exp
- #endif
- #ifndef F_MIN
- #define F_MIN f_min
- #endif
- #ifndef F_MIN_10_EXP
- #define F_MIN_10_EXP f_min_10_exp
- #endif
- #ifndef F_MAX_EXP
- #define F_MAX_EXP f_max_exp
- #endif
- #ifndef F_MAX
- #define F_MAX f_max
- #endif
- #ifndef F_MAX_10_EXP
- #define F_MAX_10_EXP f_max_10_exp
- #endif
-
- #ifndef VERIFY
- #define Validate(prec, val, req, same) {;}
- #endif
-
- #ifdef Integer
-
- Procedure IPROP() {
- /* the properties of short, int, and long */
- Volatile Integer newi, int_max, maxeri, int_min, minneri;
- Volatile int ibits, ipower, two=2;
-
- /* Calculate max short/int/long ***********************************/
- /* Calculate 2**n-1 until overflow - then use the previous value */
-
- newi=1; int_max=0;
-
- if (setjmp(lab)==0) { /* Yields int_max */
- for(ipower=0; newi>int_max; ipower++) {
- int_max=newi;
- newi=newi*two+1;
- }
- Vprintf("%sOverflow of a%s %s does not generate a trap%s\n",
- co, INT[0]=='i'?"n":"", INT, oc);
- } else {
- Vprintf("%sOverflow of a%s %s generates a trap%s\n",
- co, INT[0]=='i'?"n":"", INT, oc);
- }
- Unexpected(7);
-
- /* Minimum value: assume either two's or one's complement *********/
- int_min= -int_max;
- if (setjmp(lab)==0) { /* Yields int_min */
- if (int_min-1 < int_min) int_min--;
- }
- Unexpected(8);
-
- /* Now for those daft Cybers: */
-
- maxeri=0; newi=int_max;
-
- if (setjmp(lab)==0) { /* Yields maxeri */
- for(ibits=ipower; newi>maxeri; ibits++) {
- maxeri=newi;
- newi=newi+newi+1;
- }
- }
- Unexpected(9);
-
- minneri= -maxeri;
- if (setjmp(lab)==0) { /* Yields minneri */
- if (minneri-1 < minneri) minneri--;
- }
- Unexpected(10);
-
- Vprintf("%sMaximum %s = %ld (= 2**%d-1)%s\n",
- co, INT, (long)int_max, ipower, oc);
- Vprintf("%sMinimum %s = %ld%s\n", co, INT, (long)int_min, oc);
-
- if (L) i_define(D_INT_MAX, INT,
- Iname, "_MAX", (long) int_max, (long) I_MAX, IMARK);
- if (L) i_define(D_INT_MIN, INT,
- Iname, "_MIN", (long) int_min, (long) I_MIN, IMARK);
-
- if (maxeri>int_max) {
- Vprintf("%sThere is a larger %s, %ld (= 2**%d-1), %s %s%s\n",
- co, INT, (long)maxeri, ibits,
- "but only for addition, not multiplication",
- "(I smell a Cyber!)",
- oc);
- }
-
- if (minneri<int_min) {
- Vprintf("%sThere is a smaller %s, %ld, %s %s%s\n",
- co, INT, (long)minneri,
- "but only for addition, not multiplication",
- "(I smell a Cyber!)",
- oc);
- }
- }
-
- Procedure UPROP () {
- /* The properties of unsigned short/int/long */
- #ifdef OK_UI
- Volatile unsigned Integer int_max, newi, two;
- newi=1; int_max=0; two=2;
-
- if (setjmp(lab)==0) { /* Yields int_max */
- while(newi>int_max) {
- int_max=newi;
- newi=newi*two+1;
- }
- }
- Unexpected(11);
- Vprintf("%sMaximum unsigned %s = %lu%s\n",
- co, INT, (unsigned long) int_max, oc);
- if (L) u_define(D_UINT_MAX, INT,
- Uname, "_MAX", (unsigned long) int_max,
- (unsigned long) U_MAX, IMARK);
- #endif
- }
-
- #endif /* Integer */
-
- #ifdef Number
-
- /* The following routines are intended to defeat any attempt at optimisation
- or use of extended precision, and to defeat faulty narrowing casts.
- The weird prototypes are because of widening incompatibilities.
- */
- #ifdef STDC
- #define ARGS1(atype, a) (atype a)
- #define ARGS2(atype, a, btype, b) (atype a, btype b)
- #else
- #define ARGS1(atype, a) (a) atype a;
- #define ARGS2(atype, a, btype, b) (a, b) atype a; btype b;
- #endif
-
- Procedure Store ARGS2(Number, a, Number *, b) { *b=a; }
- Number Sum ARGS2(Number, a, Number, b) {Number r; Store(a+b, &r); return (r); }
- Number Diff ARGS2(Number, a, Number, b){Number r; Store(a-b, &r); return (r); }
- Number Mul ARGS2(Number, a, Number, b) {Number r; Store(a*b, &r); return (r); }
- Number Div ARGS2(Number, a, Number, b) {Number r; Store(a/b, &r); return (r); }
- Number Self ARGS1(Number, a) {Number r; Store(a, &r); return (r); }
-
- Procedure F_check ARGS((int precision, Long_double val1));
-
- Procedure F_check(precision, val1) int precision; Long_double val1; {
- /* You don't think I'm going to go to all the trouble of writing
- a program that works out what all sorts of values are, only to
- have printf go and print the wrong values out, do you?
- No, you're right, so this function tries to see if printf
- has written the right value, by reading it back again.
- This introduces a new problem of course: suppose printf writes
- the correct value, and scanf reads it back wrong... oh well.
- But I'm adamant about this: the precision given is enough
- to uniquely identify the printed number, therefore I insist
- that sscanf read the number back identically. Harsh yes, but
- sometimes you've got to be cruel to be kind.
- */
- Long_double new1;
- Number val, new, diff;
- double rem;
- int e;
- char *rep;
- char *f2;
-
- if (sizeof(double) == sizeof(Long_double)) {
- /* Assume they're the same, and use non-stdc format */
- /* This is for stdc compilers using non-stdc libraries */
- f2= "%le"; /* Input */
- } else {
- /* It had better support Le then */
- f2= "%Le";
- }
- val= val1;
- rep= f_rep(precision, (Long_double) val);
- if (setjmp(lab)==0) {
- sscanf(rep, f2, &new1);
- } else {
- eek_a_bug("sscanf caused a trap");
- printf("%s scanning: %s format: %s%s\n\n", co, rep, f2, oc);
- Unexpected(12);
- return;
- }
-
- if (setjmp(lab)==0) { /* See if new is usable */
- new= new1;
- if (new != 0.0) {
- diff= val/new - 1.0;
- if (diff < 0.1) diff= 1.0;
- /* That should be enough to generate a trap */
- }
- } else {
- eek_a_bug("sscanf returned an unusable number");
- printf("%s scanning: %s with format: %s%s\n\n",
- co, rep, f2, oc);
- Unexpected(13);
- return;
- }
-
- Unexpected(14);
- if (new != val) {
- eek_a_bug("Possibly bad output from printf above");
- if (!exponent((Long_double)val, &rem, &e)) {
- printf("%s but value was an unusable number%s\n\n",
- co, oc);
- return;
- }
- printf("%s expected value around %.*fe%d, bit pattern:\n ",
- co, precision, rem, e);
- bitpattern((char *) &val, sizeof(val));
- printf ("%s\n", oc);
- printf("%s sscanf gave %s, bit pattern:\n ",
- co, f_rep(precision, (Long_double) new));
- bitpattern((char *) &new, sizeof(new));
- printf ("%s\n", oc);
- if (setjmp(lab) == 0) {
- diff= val-new;
- printf("%s difference= %s%s\n\n",
- co, f_rep(precision, (Long_double) diff), oc);
- } /* else forget it */
- Unexpected(15);
- }
- }
-
- #ifdef VERIFY
- Procedure Validate(prec, val, req, same) int prec, same; Long_double val, req; {
- /* Check that the compiler has read a #define value correctly */
- Unexpected(16);
- if (!same) {
- printf("%s*** Verify failed for above #define!\n", co);
- if (setjmp(lab) == 0) { /* for the case that req == nan */
- printf(" Compiler has %s for value%s\n",
- f_rep(prec, req), oc);
- } else {
- printf(" Compiler has %s for value%s\n",
- "an unusable number", oc);
- }
- if (setjmp(lab) == 0) {
- F_check(prec, (Long_double) req);
- } /*else forget it*/
- if (setjmp(lab) == 0) {
- if (req > 0.0 && val > 0.0) {
- printf("%s difference= %s%s\n",
- co, f_rep(prec, val-req), oc);
- }
- } /*else forget it*/
- Unexpected(17);
- printf("\n");
- bugs++;
- } else if (val != req) {
- if (stdc) {
- printf("%s*** Verify failed for above #define!\n", co);
- printf(" Constant has the wrong precision%s\n",
- oc);
- } else eek_a_bug("the cast didn't work");
- printf("\n");
- bugs++;
- }
- }
- #endif /* VERIFY */
-
- int FPROP(bits_per_byte) int bits_per_byte; {
- /* Properties of floating types, using algorithms by Cody and Waite
- from MA Malcolm, as modified by WM Gentleman and SB Marovich.
- Further extended by S Pemberton.
-
- Returns the number of digits in the fraction.
- */
-
- Volatile int
- i, f_radix, iexp, irnd, mrnd, f_rounds, f_mant_dig,
- iz, k, inf, machep, f_max_exp, f_min_exp, mx, negeps,
- mantbits, digs, f_dig, trap,
- hidden, normal, f_min_10_exp, f_max_10_exp;
- Volatile Number
- a, b, base, basein, basem1, f_epsilon, epsneg,
- eps, epsp1, etop, ebot,
- f_max, newxmax, f_min, xminner, y, y1, z, z1, z2;
-
- Unexpected(18);
-
- Vprintf("%sPROPERTIES OF %s:%s\n", co, THING, oc);
-
- /* Base and size of mantissa **************************************/
- /* First repeatedly double until adding 1 has no effect. */
- /* For instance, if base is 10, with 3 significant digits */
- /* it will try 1, 2, 4, 8, ... 512, 1024, and stop there, */
- /* since 1024 is only representable as 1020. */
- a=1.0;
- if (setjmp(lab)==0) { /* inexact trap? */
- do { a=Sum(a, a); }
- while (Diff(Diff(Sum(a, ONE), a), ONE) == ZERO);
- } else {
- fprintf(stderr, "*** Program got loss-of-precision trap!\n");
- /* And supporting those is just TOO much trouble! */
- farewell(bugs+1);
- }
- Unexpected(19);
- /* Now double until you find a number that can be added to the */
- /* above number. For 1020 this is 8 or 16, depending whether the */
- /* result is rounded or truncated. */
- /* In either case the result is 1030. 1030-1020= the base, 10. */
- b=1.0;
- do { b=Sum(b, b); } while ((base=Diff(Sum(a, b), a)) == ZERO);
- f_radix=base;
- Vprintf("%sBase = %d%s\n", co, f_radix, oc);
-
- /* Sanity check; if base<2, I can't guarantee the rest will work */
- if (f_radix < 2) {
- eek_a_bug("Function return or parameter passing faulty? (This is a guess.)");
- printf("\n");
- return(0);
- }
-
- #ifdef PASS1 /* only for FLT */
- flt_radix= f_radix;
- if (F) i_define(D_FLT_RADIX, "",
- "FLT", "_RADIX", (long) f_radix, (long) F_RADIX, "");
- #else
- if (f_radix != flt_radix) {
- printf("\n%s*** WARNING: %s %s (%d) %s%s\n",
- co, thing, "arithmetic has a different radix",
- f_radix, "from float", oc);
- bugs++;
- }
- #endif
-
- /* Now the number of digits precision: */
- f_mant_dig=0; b=1.0;
- do { f_mant_dig++; b=Mul(b, base); }
- while (Diff(Diff(Sum(b, ONE), b), ONE) == ZERO);
- f_dig=floor_log(10, (Long_double)(b/base)) + (base==10?1:0);
- Vprintf("%sSignificant base digits = %d %s %d %s%s\n",
- co, f_mant_dig, "(= at least", f_dig, "decimal digits)", oc);
- if (F) i_define(D_MANT_DIG, thing,
- Fname, "_MANT_DIG", (long) f_mant_dig,
- (long) F_MANT_DIG, "");
- if (F) i_define(D_DIG, thing,
- Fname, "_DIG", (long) f_dig, (long) F_DIG, "");
- digs= ceil_log(10, (Long_double)b); /* the number of digits to printf */
-
- /* Rounding *******************************************************/
- basem1=Diff(base, HALF);
- if (Diff(Sum(a, basem1), a) != ZERO) {
- if (f_radix == 2) basem1=0.375;
- else basem1=1.0;
- if (Diff(Sum(a, basem1), a) != ZERO) irnd=2; /* away from 0 */
- else irnd=1; /* to nearest */
- } else irnd=0; /* towards 0 */
-
- basem1=Diff(base, HALF);
-
- if (Diff(Diff(-a, basem1), -a) != ZERO) {
- if (f_radix == 2) basem1=0.375;
- else basem1=1.0;
- if (Diff(Diff(-a, basem1), -a) != ZERO) mrnd=2; /* away from 0*/
- else mrnd=1; /* to nearest */
- } else mrnd=0; /* towards 0 */
-
- f_rounds= -1; /* Unknown rounding */
- if (irnd==0 && mrnd==0) f_rounds=0; /* zero = chops */
- if (irnd==1 && mrnd==1) f_rounds=1; /* nearest */
- if (irnd==2 && mrnd==0) f_rounds=2; /* +inf */
- if (irnd==0 && mrnd==2) f_rounds=3; /* -inf */
-
- if (f_rounds != -1) {
- Vprintf("%sArithmetic rounds towards ", co);
- switch (f_rounds) {
- case 0: Vprintf("zero (i.e. it chops)"); break;
- case 1: Vprintf("nearest"); break;
- case 2: Vprintf("+infinity"); break;
- case 3: Vprintf("-infinity"); break;
- default: Vprintf("???"); break;
- }
- Vprintf("%s\n", oc);
- } else { /* Hmm, try to give some help here: */
- Vprintf("%sArithmetic rounds oddly: %s\n", co, oc);
- Vprintf("%s Negative numbers %s%s\n",
- co, mrnd==0 ? "towards zero" :
- mrnd==1 ? "to nearest" :
- "away from zero",
- oc);
- Vprintf("%s Positive numbers %s%s\n",
- co, irnd==0 ? "towards zero" :
- irnd==1 ? "to nearest" :
- "away from zero",
- oc);
- }
- /* An extra goody */
- if (f_radix == 2 && f_rounds == 1) {
- if (Diff(Sum(a, ONE), a) != ZERO) {
- Vprintf("%s Tie breaking rounds up%s\n", co, oc);
- } else if (Diff(Sum(a, THREE), a) == FOUR) {
- Vprintf("%s Tie breaking rounds to even%s\n", co, oc);
- } else {
- Vprintf("%s Tie breaking rounds down%s\n", co, oc);
- }
- }
- #ifdef PASS1 /* only for FLT */
- flt_rounds= f_rounds;
- if (F)
- i_define(D_FLT_ROUNDS, "",
- "FLT", "_ROUNDS", (long) f_rounds, (long) F_ROUNDS, "");
- #else
- if (f_rounds != flt_rounds) {
- printf("\n%s*** WARNING: %s %s (%d) %s%s\n",
- co, thing, "arithmetic rounds differently",
- f_rounds, "from float", oc);
- bugs++;
- }
- #endif
-
- /* Various flavours of epsilon ************************************/
- negeps=f_mant_dig+f_mant_dig;
- basein=1.0/base;
- a=1.0;
- for(i=1; i<=negeps; i++) a*=basein;
-
- b=a;
- while (Diff(Diff(ONE, a), ONE) == ZERO) {
- a*=base;
- negeps--;
- }
- negeps= -negeps;
- Vprintf("%sSmallest x such that 1.0-base**x != 1.0 = %d%s\n",
- co, negeps, oc);
-
- etop = ONE;
- ebot = ZERO;
- eps = Sum(ebot, Div(Diff(etop, ebot), TWO));
- while (eps != ebot && eps != etop) {
- epsp1 = Diff(ONE, eps);
- if (epsp1 < ONE) etop = eps;
- else ebot = eps;
- eps = Sum(ebot, Div(Diff(etop, ebot), TWO));
- }
- /* Sanity check */
- if (Diff(ONE, etop) >= ONE || Diff(ONE, ebot) != ONE) {
- eek_a_bug("internal error calculating epsneg");
- }
- Vprintf("%sSmallest x such that 1.0-x != 1.0 = %s%s\n",
- co, f_rep(digs, (Long_double) eps), oc);
- if (V) F_check(digs, (Long_double) eps);
-
- epsneg=a;
- if ((f_radix!=2) && irnd) {
- /* a=(a*(1.0+a))/(1.0+1.0); => */
- a=Div(Mul(a, Sum(ONE, a)), Sum(ONE, ONE));
- /* if ((1.0-a)-1.0 != 0.0) epsneg=a; => */
- if (Diff(Diff(ONE, a), ONE) != ZERO) epsneg=a;
- }
- /* epsneg is used later */
- Unexpected(20);
-
- machep= -f_mant_dig-f_mant_dig;
- a=b;
- while (Diff(Sum(ONE, a), ONE) == ZERO) { a*=base; machep++; }
- Vprintf("%sSmallest x such that 1.0+base**x != 1.0 = %d%s\n",
- co, machep, oc);
-
- etop = ONE;
- ebot = ZERO;
- eps = Sum(ebot, Div(Diff(etop, ebot), TWO));
- while (eps != ebot && eps != etop) {
- epsp1 = Sum(ONE, eps);
- if (epsp1 > ONE) etop = eps;
- else ebot = eps;
- eps = Sum(ebot, Div(Diff(etop, ebot), TWO));
- }
- /* Sanity check */
- if (Sum(ONE, etop) <= ONE || Sum(ONE, ebot) != ONE) {
- eek_a_bug("internal error calculating eps");
- }
- f_epsilon=etop;
-
- Vprintf("%sSmallest x such that 1.0+x != 1.0 = %s%s\n",
- co, f_rep(digs, (Long_double) f_epsilon), oc);
- /* Possible loss of precision warnings here from non-stdc compilers: */
- if (F) f_define(D_EPSILON, thing,
- Fname, "_EPSILON", digs, (Long_double) f_epsilon, MARK);
- if (V || F) F_check(digs, (Long_double) f_epsilon);
- Unexpected(21);
- if (F) Validate(digs, (Long_double) f_epsilon, (Long_double) F_EPSILON,
- f_epsilon == Self(F_EPSILON));
- Unexpected(22);
-
- /* Extra chop info *************************************************/
- if (f_rounds == 0) {
- if (Diff(Mul(Sum(ONE,f_epsilon),ONE),ONE) != ZERO) {
- Vprintf("%sAlthough arithmetic chops, it uses guard digits%s\n", co, oc);
- }
- }
-
- /* Size of and minimum normalised exponent ************************/
- y=0; i=0; k=1; z=basein; z1=(1.0+f_epsilon)/base;
-
- /* Coarse search for the largest power of two */
- if (setjmp(lab)==0) { /* for underflow trap */ /* Yields i, k, y, y1 */
- do {
- y=z; y1=z1;
- z=Mul(y,y); z1=Mul(z1, y);
- a=Mul(z,ONE);
- z2=Div(z1,y);
- if (z2 != y1) break;
- if ((Sum(a,a) == ZERO) || (fabs(z) >= y)) break;
- i++;
- k+=k;
- } while(1);
- } else {
- Vprintf("%s%s underflow generates a trap%s\n", co, Thing, oc);
- }
- Unexpected(23);
-
- if (f_radix != 10) {
- iexp=i+1; /* for the sign */
- mx=k+k;
- } else {
- iexp=2;
- iz=f_radix;
- while (k >= iz) { iz*=f_radix; iexp++; }
- mx=iz+iz-1;
- }
-
- /* Fine tune starting with y and y1 */
- if (setjmp(lab)==0) { /* for underflow trap */ /* Yields k, f_min */
- do {
- f_min=y; z1=y1;
- y=Div(y,base); y1=Div(y1,base);
- a=Mul(y,ONE);
- z2=Mul(y1,base);
- if (z2 != z1) break;
- if ((Sum(a,a) == ZERO) || (fabs(y) >= f_min)) break;
- k++;
- } while (1);
- }
- Unexpected(24);
-
- f_min_exp=(-k)+1;
-
- if ((mx <= k+k-3) && (f_radix != 10)) { mx+=mx; iexp+=1; }
- Vprintf("%sNumber of bits used for exponent = %d%s\n", co, iexp, oc);
- Vprintf("%sMinimum normalised exponent = %d%s\n", co, f_min_exp, oc);
- if (F)
- i_define(D_MIN_EXP, thing,
- Fname, "_MIN_EXP", (long) f_min_exp, (long) F_MIN_EXP, "");
-
- if (setjmp(lab)==0) {
- Vprintf("%sMinimum normalised positive number = %s%s\n",
- co, f_rep(digs, (Long_double) f_min), oc);
- } else {
- eek_a_bug("printf can't print the smallest normalised number");
- printf("\n");
- }
- Unexpected(25);
- /* Possible loss of precision warnings here from non-stdc compilers: */
- if (setjmp(lab) == 0) {
- if (F) f_define(D_MIN, thing,
- Fname, "_MIN", digs, (Long_double) f_min, MARK);
- if (V || F) F_check(digs, (Long_double) f_min);
- } else {
- eek_a_bug("xxx_MIN caused a trap");
- printf("\n");
- }
-
- if (setjmp(lab) == 0) {
- if (F) Validate(digs, (Long_double) f_min, (Long_double) F_MIN,
- f_min == Self(F_MIN));
- } else {
- printf("%s*** Verify failed for above #define!\n %s %s\n\n",
- co, "Compiler has an unusable number for value", oc);
- bugs++;
- }
- Unexpected(26);
-
- a=1.0; f_min_10_exp=0;
- while (a > f_min*10.0) { a/=10.0; f_min_10_exp--; }
- if (F) i_define(D_MIN_10_EXP, thing,
- Fname, "_MIN_10_EXP", (long) f_min_10_exp,
- (long) F_MIN_10_EXP, "");
-
- /* Minimum exponent ************************************************/
- if (setjmp(lab)==0) { /* for underflow trap */ /* Yields xminner */
- do {
- xminner=y;
- y=Div(y,base);
- a=Mul(y,ONE);
- if ((Sum(a,a) == ZERO) || (fabs(y) >= xminner)) break;
- } while (1);
- }
- Unexpected(27);
-
- if (xminner != 0.0 && xminner != f_min) {
- normal= 0;
- Vprintf("%sThe smallest numbers are not kept normalised%s\n",
- co, oc);
- if (setjmp(lab)==0) {
- Vprintf("%sSmallest unnormalised positive number = %s%s\n",
- co, f_rep(digs, (Long_double) xminner), oc);
- if (V) F_check(digs, (Long_double) xminner);
- } else {
- eek_a_bug("printf can't print the smallest unnormalised number.");
- printf("\n");
- }
- Unexpected(28);
- } else {
- normal= 1;
- Vprintf("%sThe smallest numbers are normalised%s\n", co, oc);
- }
-
- /* Maximum exponent ************************************************/
- f_max_exp=2; f_max=1.0; newxmax=base+1.0;
- inf=0; trap=0;
- while (f_max<newxmax) {
- f_max=newxmax;
- if (setjmp(lab) == 0) { /* Yields inf, f_max_exp */
- newxmax=Mul(newxmax, base);
- } else {
- trap=1;
- break;
- }
- if (Div(newxmax, base) != f_max) {
- inf=1; /* ieee infinity */
- break;
- }
- f_max_exp++;
- }
- Unexpected(29);
- if (trap) {
- Vprintf("%s%s overflow generates a trap%s\n", co, Thing, oc);
- }
-
- if (inf) Vprintf("%sThere is an 'infinite' value%s\n", co, oc);
- Vprintf("%sMaximum exponent = %d%s\n", co, f_max_exp, oc);
- if (F) i_define(D_MAX_EXP, thing,
- Fname, "_MAX_EXP", (long) f_max_exp,
- (long) F_MAX_EXP, "");
-
- /* Largest number ***************************************************/
- f_max=Diff(ONE, epsneg);
- if (Mul(f_max,ONE) != f_max) f_max=Diff(ONE, Mul(base,epsneg));
- for (i=1; i<=f_max_exp; i++) f_max=Mul(f_max, base);
-
- if (setjmp(lab)==0) {
- Vprintf("%sMaximum number = %s%s\n",
- co, f_rep(digs, (Long_double) f_max), oc);
- } else {
- eek_a_bug("printf can't print the largest double.");
- printf("\n");
- }
- if (setjmp(lab)==0) {
- /* Possible loss of precision warnings here from non-stdc compilers: */
- if (F) f_define(D_MAX, thing,
- Fname, "_MAX", digs, (Long_double) f_max, MARK);
- if (V || F) F_check(digs, (Long_double) f_max);
- } else {
- eek_a_bug("xxx_MAX caused a trap");
- printf("\n");
- }
- if (setjmp(lab)==0) {
- if (F) Validate(digs, (Long_double) f_max, (Long_double) F_MAX,
- f_max == Self(F_MAX));
- } else {
- printf("%s*** Verify failed for above #define!\n %s %s\n\n",
- co, "Compiler has an unusable number for value", oc);
- bugs++;
- }
- Unexpected(30);
-
- a=1.0; f_max_10_exp=0;
- while (a < f_max/10.0) { a*=10.0; f_max_10_exp++; }
- if (F) i_define(D_MAX_10_EXP, thing,
- Fname, "_MAX_10_EXP", (long) f_max_10_exp,
- (long) F_MAX_10_EXP, "");
-
- /* Hidden bit + sanity check ****************************************/
- if (f_radix != 10) {
- hidden=0;
- mantbits=floor_log(2, (Long_double)f_radix)*f_mant_dig;
- if (mantbits+iexp == (int)sizeof(Number)*bits_per_byte) {
- hidden=1;
- Vprintf("%sArithmetic uses a hidden bit%s\n", co, oc);
- } else if (mantbits+iexp+1 == (int)sizeof(Number)*bits_per_byte) {
- Vprintf("%sArithmetic doesn't use a hidden bit%s\n",
- co, oc);
- } else {
- printf("\n%s%s\n %s %s %s!%s\n\n",
- co,
- "*** Something fishy here!",
- "Exponent size + mantissa size doesn't match",
- "with the size of a", thing,
- oc);
- }
- if (hidden && f_radix == 2 && f_max_exp+f_min_exp==3) {
- Vprintf("%sIt looks like %s length IEEE format%s\n",
- co, f_mant_dig==24 ? "single" :
- f_mant_dig==53 ? "double" :
- f_mant_dig >53 ? "extended" :
- "some", oc);
- if (f_rounds != 1 || normal) {
- Vprintf("%s though ", co);
- if (f_rounds != 1) {
- Vprintf("the rounding is unusual");
- if (normal) Vprintf(" and ");
- }
- if (normal) Vprintf("the normalisation is unusual");
- Vprintf("%s\n", oc);
- }
- } else {
- Vprintf("%sIt doesn't look like IEEE format%s\n",
- co, oc);
- }
- }
- printf("\n"); /* regardless of verbosity */
- return f_mant_dig;
- }
-
- Procedure EPROP(fprec, dprec, lprec) int fprec, dprec, lprec; {
- /* See if expressions are evaluated in extended precision.
- Some compilers optimise even if you don't want it,
- and then this function fails to produce the right result.
- We try to diagnose this if it happens.
- */
- Volatile int eprec;
- Volatile double a, b, base, old;
- Volatile Number d, oldd, dbase, one, zero;
- Volatile int bad=0;
-
- /* Size of mantissa **************************************/
- a=1.0;
- if (setjmp(lab) == 0) { /* Yields nothing */
- do { old=a; a=a+a; }
- while ((((a+1.0)-a)-1.0) == 0.0 && a>old);
- } else bad=1;
- if (a <= old) bad=1;
-
- if (!bad) {
- b=1.0;
- if (setjmp(lab) == 0) { /* Yields nothing */
- do { old=b; b=b+b; }
- while ((base=((a+b)-a)) == 0.0 && b>old);
- if (b <= old) bad=1;
- } else bad=1;
- }
-
- if (!bad) {
- eprec=0; d=1.0; dbase=base; one=1.0; zero=0.0;
- if (setjmp(lab) == 0) { /* Yields nothing */
- do { eprec++; oldd=d; d=d*dbase; }
- while ((((d+one)-d)-one) == zero && d>oldd);
- if (d <= oldd) bad=1;
- } else bad=1;
- }
-
- Unexpected(31);
-
- if (bad) {
- Vprintf("%sCan't determine precision for %s expressions:\n%s%s\n",
- co, thing, " check that you compiled without optimisation!",
- oc);
- } else if (eprec==dprec) {
- Vprintf("%s%s expressions are evaluated in double precision%s\n",
- co, Thing, oc);
- } else if (eprec==fprec) {
- Vprintf("%s%s expressions are evaluated in float precision%s\n",
- co, Thing, oc);
- } else if (eprec==lprec) {
- Vprintf("%s%s expressions are evaluated in long double precision%s\n",
- co, Thing, oc);
- } else {
- Vprintf("%s%s expressions are evaluated in a %s %s %d %s%s\n",
- co, Thing, eprec>dprec ? "higher" : "lower",
- "precision than double,\n using",
- eprec, "base digits",
- oc);
- }
- }
-
- #else /* not Number */
-
- #ifdef FPROP
- /* ARGSUSED */
- int FPROP(bits_per_byte) int bits_per_byte; { return 0; }
- #endif
- #ifdef EPROP
- /* ARGSUSED */
- Procedure EPROP(fprec, dprec, lprec) int fprec, dprec, lprec; {}
- #endif
-
- #endif /* ifdef Number */
-
- #ifdef PASS3
- #undef PASS
- #endif
-
- #ifdef PASS2
- #undef PASS2
- #define PASS3 1
- #endif
-
- #ifdef PASS1
- #undef PASS1
- #define PASS2 1
- #endif
-
- #ifdef PASS0
- #undef PASS0
- #endif
-
- #ifdef PASS /* then rescan this file */
- #ifdef NO_FILE
- #include "config.c"
- #else /* if the next line fails to compile, define NO_FILE */
- #include __FILE__
- #endif
- #endif /* PASS */
-
-
-
- --
- Skip (montanaro@crdgw1.ge.com)
-