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Article #51842Re: C compiler to use coprocessor capabilities on Sparcs
From: Richard Stallman
Date: Mon, 22 Mar 1993 20:49
Date: Mon, 22 Mar 1993 20:49
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1644 bytes
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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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 11318c,ec5e906038492113 X-Google-Attributes: gid11318c,public X-Google-ArrivalTime: 1993-03-23 00:21:39 PST Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!cis.ohio-state.edu!gnu.ai.mit.edu!rms 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 Organization: GNUs Not Usenet Lines: 21 Sender: daemon@cis.ohio-state.edu Distribution: gnu Message-ID: <9303222042.AA05137@geech.gnu.ai.mit.edu> References: <1993Mar22.114948.8553@fwi.uva.nl>