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| author | H.J. Lu <hjl.tools@gmail.com> | 2014-07-14 07:58:27 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2014-07-14 07:58:27 -0700 |
| commit | f2fef657d8736c32fb600771949f59852558b11a (patch) | |
| tree | a9e954223fa5cbd9e53f143e0f50c6f6276ebe0c /sysdeps/i386 | |
| parent | f6c44d475104e931bab2b4ffa499961088de673c (diff) | |
| download | glibc-f2fef657d8736c32fb600771949f59852558b11a.tar.gz glibc-f2fef657d8736c32fb600771949f59852558b11a.tar.xz glibc-f2fef657d8736c32fb600771949f59852558b11a.zip | |
Enable AVX2 optimized memset only if -mavx2 works
* config.h.in (HAVE_AVX2_SUPPORT): New #undef. * sysdeps/i386/configure.ac: Set HAVE_AVX2_SUPPORT and config-cflags-avx2. * sysdeps/x86_64/configure.ac: Likewise. * sysdeps/i386/configure: Regenerated. * sysdeps/x86_64/configure: Likewise. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add memset-avx2 only if config-cflags-avx2 is yes. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Tests for memset_chk and memset only if HAVE_AVX2_SUPPORT is defined. * sysdeps/x86_64/multiarch/memset.S: Define multiple versions only if HAVE_AVX2_SUPPORT is defined. * sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
Diffstat (limited to 'sysdeps/i386')
| -rw-r--r-- | sysdeps/i386/configure | 26 | ||||
| -rw-r--r-- | sysdeps/i386/configure.ac | 9 |
2 files changed, 35 insertions, 0 deletions
diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure index f0a20e3d3b..6e89b597e3 100644 --- a/sysdeps/i386/configure +++ b/sysdeps/i386/configure @@ -240,6 +240,32 @@ $as_echo "$libc_cv_cc_novzeroupper" >&6; } config_vars="$config_vars config-cflags-novzeroupper = $libc_cv_cc_novzeroupper" +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for AVX2 support" >&5 +$as_echo_n "checking for AVX2 support... " >&6; } +if ${libc_cv_cc_avx2+:} false; then : + $as_echo_n "(cached) " >&6 +else + if { ac_try='${CC-cc} -mavx2 -xc /dev/null -S -o /dev/null' + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 + (eval $ac_try) 2>&5 + ac_status=$? + $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5 + test $ac_status = 0; }; }; then : + libc_cv_cc_avx2=yes +else + libc_cv_cc_avx2=no +fi + +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_avx2" >&5 +$as_echo "$libc_cv_cc_avx2" >&6; } +if test $libc_cv_cc_avx2 = yes; then + $as_echo "#define HAVE_AVX2_SUPPORT 1" >>confdefs.h + +fi +config_vars="$config_vars +config-cflags-avx2 = $libc_cv_cc_avx2" + $as_echo "#define USE_REGPARMS 1" >>confdefs.h diff --git a/sysdeps/i386/configure.ac b/sysdeps/i386/configure.ac index dfe0b47343..35c45227ff 100644 --- a/sysdeps/i386/configure.ac +++ b/sysdeps/i386/configure.ac @@ -88,6 +88,15 @@ LIBC_TRY_CC_OPTION([-mno-vzeroupper], ]) LIBC_CONFIG_VAR([config-cflags-novzeroupper], [$libc_cv_cc_novzeroupper]) +dnl Check if -mavx2 works. +AC_CACHE_CHECK(for AVX2 support, libc_cv_cc_avx2, [dnl +LIBC_TRY_CC_OPTION([-mavx2], [libc_cv_cc_avx2=yes], [libc_cv_cc_avx2=no]) +]) +if test $libc_cv_cc_avx2 = yes; then + AC_DEFINE(HAVE_AVX2_SUPPORT) +fi +LIBC_CONFIG_VAR([config-cflags-avx2], [$libc_cv_cc_avx2]) + AC_DEFINE(USE_REGPARMS) dnl It is always possible to access static and hidden symbols in an |