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- From: dhd@exnet.co.uk (Damon)
- Newsgroups: comp.arch,comp.lang.misc
- Subject: Re: how to advocate new software/hardware features (Re: Hardware Support for Numeric Algorithms)
- Message-ID: <Bxs787.C99@exnet.co.uk>
- Date: 15 Nov 92 23:43:18 GMT
- References: <TMB.92Nov14145619@pollux.idiap.ch> <Bxq7y0.IJ@mentor.cc.purdue.edu> <mwm.2n6z@contessa.palo-alto.ca.us>
- Organization: ExNet Systems Ltd Public Access News, London, UK
- Lines: 39
-
- In article <mwm.2n6z@contessa.palo-alto.ca.us> mwm@contessa.palo-alto.ca.us (Mike Meyer) writes:
- >In <Bxq7y0.IJ@mentor.cc.purdue.edu>, hrubin@mentor.cc.purdue.edu (Herman Rubin) wrote:
- >> With instruction scheduling, one place for an optimizer would be in the
- >> ASSEMBLER, and even interaction between the programmer and the compiler/
- >> assembler. I do not know of any such.
- >
- >Herman, I've *never* seen you suggest something that hasn't been tried
- >already, in some form or another. This is no exception. It's been
- >tried. It didn't work very well.
-
- On at least the Sun-3 cc/as there is a flag which implies that the
- assember is doing something tricky with the code the compiler spits
- out, eg some sort of peephole optimisation based on what the compiler
- wanted to say rather than on what it actually said...
-
- Ah, and on the Sun-4 as well, I see. Though this isn't exactly what
- Dr Rubin was talking about, I think, it's still relevant...
-
-
- AS(1) USER COMMANDS AS(1)
-
- NAME
- as - Sun-1, Sun-2 and Sun-3, Sun-4 and Sun386i assemblers
-
- ...
-
- Sun-4 Options
- -O[n]
- Enable peephole optimization corresponding to optimiza-
- tion level n (1 if n not specified) of the Sun high-
- level language compilers. This option can be used
- safely only when assembling code produced by a Sun com-
- piler.
-
- --
- Damon Hart-Davis Internet: dhd@exnet.co.uk, d@hd.org
-
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