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Article #51842

Re: C compiler to use coprocessor capabilities on Sparcs

#51842
From: Richard Stallman
Date: Mon, 22 Mar 1993 20:49
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I'm surprised to hear reports that Sun C produces faster floating
point code than GCC, since a lot of work has gone into Sparc support
and GCC was even with Sun's compiler last I heard.

If you've actually observed faster code from Sun C, please don't treat
this as if it were unalterable.  You can help improve GCC by sending a
sample program which runs significantly faster when compiled with Sun
C.  Preferably a fairly small one, so it is possible to look at the
assembler code and see why.

(You can use a profiler to find one function in which there is a
significant difference, and then use that function as the sample--but
remember to send something self-contained!  If we need anything else
to compile it, we can't use it.  CPP output is easiest to use.)

If you'd like to be even more helpful, look at both versions of the
assembler code and figure out what is suboptimal about the GCC output.

With this information, we may be able to improve the output of GCC.
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References: <1993Mar22.114948.8553@fwi.uva.nl>

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From: rms@gnu.ai.mit.edu (Richard Stallman)
Newsgroups: gnu.gcc.help
Subject: Re: C compiler to use coprocessor capabilities on Sparcs
Date: 22 Mar 1993 15:49:18 -0500
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