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- /* vsc - portable instruction scheduler for vbcc. */
- /* (c) in 1997 by Volker Barthelmann. */
-
- #include "vsc.h"
-
- char vs_copyright[]="vsc scheduler V0.0 (c) in 1997 by Volker Barthelmann";
-
- #define MAX_INS 128
- #define LINELENGTH 1024
-
- #ifndef DEBUG
- int DEBUG;
- #endif
-
- struct sinfo silist[MAX_INS];
- int si_count;
- int done;
-
- int bvcmp(unsigned char *dest,unsigned char *src,size_t len)
- /* vergleicht zwei Bitvektoren */
- {
- for(;len>0;len--)
- if(*dest++!=*src++) return(0);
- return(1);
- }
- void bvunite(unsigned char *dest,unsigned char *src,size_t len)
- /* berechnet Vereinigung zweier Bitvektoren */
- {
- for(;len>0;len--)
- *dest++|=*src++;
- }
- void bvintersect(unsigned char *dest,unsigned char *src,size_t len)
- /* berechnet Durchschnitt zweier Bitvektoren */
- {
- for(;len>0;len--)
- *dest++&=*src++;
- }
- void bvdiff(unsigned char *dest,unsigned char *src,size_t len)
- /* berechnet 'Differenz' zweier Bitvektoren */
- {
- for(;len>0;len--)
- *dest++&=~(*src++);
- }
-
- void raus(void)
- {
- sched_cleanup();
- if(DEBUG&1) printf("raus\n");
- if(done)
- exit(EXIT_SUCCESS);
- else
- exit(EXIT_FAILURE);
- }
- void *mymalloc(size_t sz)
- {
- void *p=malloc(sz);
- if(!p){
- puts("Out of memory!");
- raus();
- }
- return p;
- }
- void print_sinfo(void)
- {
- struct sinfo *p;int i,j;
- if(DEBUG&2)
- printf("print_sinfo\n");
- else
- return;
- for(j=0;j<si_count;j++){
- p=&silist[j];
- printf("inst: %s",p->txt);
- printf("flags=%u, label=%u latency=%u\n",p->flags,p->label,p->latency);
- printf("available pipelines: ");
- for(i=0;i<PIPES;i++)
- if(BTST(p->pipes,i))
- printf("%d ",i);
- printf("\nuses registers (%d=mem): ",MEM);
- for(i=0;i<=MEM;i++)
- if(BTST(p->uses,i))
- printf("%d ",i);
- printf("\nmodifies registers (%d=MEM): ",MEM);
- for(i=0;i<=MEM;i++)
- if(BTST(p->modifies,i))
- printf("%d ",i);
- printf("\n\n");
- }
- }
- void free_sinfo(void)
- {
- int j;
- for(j=0;j<si_count;j++)
- free(silist[j].txt);
- }
- void output_scheduled(FILE *f)
- {
- int pipes[PIPES],i,j,k,l,remaining;
- int latency[MEM+1]={0},cycle=0;
- unsigned char used[REGS_SIZE],modified[REGS_SIZE],tmp[REGS_SIZE],empty[REGS_SIZE]={0};
- remaining=si_count;
- if(DEBUG&2) print_sinfo();
- while(remaining){
- cycle++;
- if(DEBUG&4){
- printf("cycle %d\n",cycle);
- for(i=0;i<=MEM;i++)
- if(latency[i]>0) printf("latency[%d]=%d\n",i,latency[i]);
- }
- /* Mark all instructions which are ready. */
- memset(modified,0,REGS_SIZE);
- memset(used,0,REGS_SIZE);
- for(i=0;i<si_count;i++){
- if(silist[i].flags&OUT) continue;
- memcpy(tmp,silist[i].uses,REGS_SIZE);
- bvunite(tmp,silist[i].modifies,REGS_SIZE);
- bvintersect(tmp,modified,REGS_SIZE);
- if(bvcmp(tmp,empty,REGS_SIZE)){
- /* uses and modifies nothing that has to be modified before */
- memcpy(tmp,used,REGS_SIZE);
- bvintersect(tmp,silist[i].modifies,REGS_SIZE);
- if(bvcmp(tmp,empty,REGS_SIZE)){
- /* modifies nothing that has to be used before */
- for(k=0,j=0;j<=MEM;j++){
- if(BTST(silist[i].uses,j)&&latency[j]>0) k=1;
- }
- if(!k) silist[i].flags|=READY;
- }
- }
- bvunite(modified,silist[i].modifies,REGS_SIZE);
- bvunite(used,silist[i].uses,REGS_SIZE);
- }
-
- /* Fill pipeline slots with ready instructions. */
- for(i=0;i<PIPES;i++) pipes[i]=-1;
- for(i=0;i<si_count;i++){
- if(silist[i].flags&OUT) continue;
- if(!(silist[i].flags&READY)) continue;
- if(DEBUG&4) printf("inst ready: %s",silist[i].txt);
- k=0;
- /* Is there a free slot? */
- for(j=0;!k&&j<PIPES;j++){
- if(pipes[j]<0&&BTST(silist[i].pipes,j)){
- pipes[j]=i;
- k=1;
- }
- }
- /* Replace a scheduled instruction with smaller latency. */
- for(j=0;!k&&j<PIPES;j++){
- if(BTST(silist[i].pipes,j)&&silist[i].latency>silist[pipes[j]].latency){
- pipes[j]=i;
- k=1;
- }
- }
- }
- if(DEBUG&4) printf("instructions for cycle %d:\n",cycle);
- for(i=0;i<PIPES;i++){
- if(pipes[i]>=0){
- if(DEBUG&4) printf("%3d: %s",i,silist[pipes[i]].txt);
- fprintf(f,"%s",silist[pipes[i]].txt);
- silist[pipes[i]].flags|=OUT;
- remaining--;
- for(j=0;j<=MEM;j++){
- if(BTST(silist[pipes[i]].modifies,j)) latency[j]=silist[pipes[i]].latency;
- }
- }
- }
- for(i=0;i<=MEM;i++)
- if(latency[i]>0) latency[i]--;
- }
- }
- int main(int argc,char *argv[])
- {
- char s[LINELENGTH];int i,quiet=0;
- FILE *in,*out; char *inname=0,*outname=0;
- for(i=1;i<argc;i++){
- if(*argv[i]!='-'){
- if(!inname){
- inname=argv[i];
- }else{
- if(outname){
- printf("Only one input file allowed\n");
- raus();
- }else{
- outname=argv[i];
- }
- }
- }else{
- if(!strcmp("-quiet",argv[i])) {quiet=1;continue;}
- #ifndef DEBUG
- if(!strncmp("-debug=",argv[i],7)){DEBUG=atoi(argv[i]+7);continue;}
- #endif
- printf("Unknown option \"%s\"\n",argv[i]);
- raus();
- }
- }
- if(!sched_init()){printf("sched_init failed\n");raus();}
- if(!quiet) printf("%s\n%s\n",vs_copyright,tg_copyright);
- if(!inname){printf("No input file\n");raus();}
- if(!outname){printf("No output file\n");raus();}
- in=fopen(inname,"r");
- if(!in){printf("Could not open input file \"%s\"\n",inname);raus();}
- out=fopen(outname,"w");
- if(!out){printf("Could not open output file \"%s\"\n");raus();}
- while(fgets(s,LINELENGTH-1,in)){
- memset(&silist[si_count],0,sizeof(silist[0]));
- silist[si_count].txt=mymalloc(strlen(s)+1);
- strcpy(silist[si_count].txt,s);
- if(!sched_info(&silist[si_count])){
- printf("Do not understand instruction:\n%s\n",silist[si_count].txt);
- raus();
- }
- if(silist[si_count].flags&(BARRIER|LABEL|COND_BRANCH|UNCOND_BRANCH)){
- if(DEBUG&1) printf("Barrier: %s",silist[si_count].txt);
- output_scheduled(out);
- free_sinfo();
- fprintf(out,silist[si_count].txt);
- si_count=0;
- }else{
- if(++si_count>=MAX_INS){
- if(DEBUG&1) printf("MAX_INS reached: %s",silist[si_count].txt);
- output_scheduled(out);
- free_sinfo();
- si_count=0;
- }
- }
- }
- output_scheduled(out);
- free_sinfo();
- done=1;
- raus();
- }
-
-
-