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Re: glibc optimizations and x86 variants
- To: "Joseph S. Myers" <jsm28@cam.ac.uk>
- Subject: Re: glibc optimizations and x86 variants
- From: Ulrich Drepper <drepper@cygnus.com>
- Date: 18 Jan 1999 17:43:38 -0800
- Cc: libc-alpha@cygnus.com
- References: <Pine.SOL.3.95q.990118235810.21014A-100000@red.csi.cam.ac.uk>
- Reply-To: drepper@cygnus.com (Ulrich Drepper)
"Joseph S. Myers" <jsm28@cam.ac.uk> writes:
> Some of the optimized assembler sources in glibc (2.0.110) for x86
> variants seem to use non-386 instructions. Does glibc substitute 386
> versions at runtime if needed? (The INSTALL file says that a library
> compiled for a Pentium will still work on a 386.)
Only if you select -mpentiumpro you'll get code which does not run on
prior processors.
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