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On Tue, Oct 2, 2012 at 12:47 PM, OndÅej BÃlka <neleai@seznam.cz> wrote: > On Tue, Oct 02, 2012 at 03:31:50PM -0400, Mike Frysinger wrote: >> On Tuesday 02 October 2012 15:20:54 H.J. Lu wrote: >> > On Tue, Oct 2, 2012 at 12:02 PM, Mike Frysinger <vapier@gentoo.org> wrote: >> > > On Tuesday 02 October 2012 09:53:25 H.J. Lu wrote: >> > >> This patch compiles AVX libm functions with -mavx. It reduces text size >> > > >> > >> of libm.so by about 1%: >> > > looks like you're reverting 56f6f6a2403cfa7267cad722597113be35ecf70d. >> > > shouldn't you revert all of it and not just change the CFLAGS back ? >> > >> > Doesn't this patch: >> > >> > http://sourceware.org/ml/libc-alpha/2012-10/msg00055.html >> > >> > do that? >> >> yes, i missed the follow up >> >> > > it'd be useful to know *why* Ulrich moved away from -mavx, but >> > > unfortunately his commit message is useless. >> > >> > I can only guess: >> >> might be useful to put some notes (like referring to the older commit) into >> the commit message when you do commit things >> -mike > > could it be a 60 cycle penalty when switching between legagy sse and avx > state? > Here is a patch to compile AVX libm functions with -mavx -mprefer-avx128. -- H.J. --- * config.make.in (config-cflags-avx128): New. * configure.in (libc_cv_cc_avx128): AC_SUBST. * sysdeps/i386/configure.in: Add -mprefer-avx128 check. * sysdeps/x86_64/configure.in: Likewise. * configure: Regenerated. * sysdeps/i386/configure: Likewise. * sysdeps/x86_64/configure: Likewise. * sysdeps/x86_64/fpu/multiarch/Makefile (CFLAGS-e_atan2-avx.c): Set to -mavx -mprefer-avx128 if supported. (CFLAGS-e_exp-avx.c): Likewise. (CFLAGS-e_log-avx.c): Likewise. (CFLAGS-mpa-avx.c): Likewise. (CFLAGS-mpexp-avx.c): Likewise. (CFLAGS-mplog-avx.c): Likewise. (CFLAGS-s_atan-avx.c): Likewise. (CFLAGS-s_sin-avx.c): Likewise. (CFLAGS-slowexp-avx.c): Likewise. (CFLAGS-s_tan-avx.c): Likewise.
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libc-avx128-1.patch
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