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mesa: Drop -fno-builtin-memcmp.

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According to the referenced bug report, gcc-4.5 and newer do not inline
memcmp(). I see no difference in performance of ipers with llvmpipe on a
Sandybridge (which does not have "Enhanced REP MOVSB/STOSB") by removing
this flag.

I attempted to confirm the problem with gcc-4.4, but it fails to compile
for quite a few different reasons.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2016-06-30 14:16:16 -07:00
parent 5ec140c17b
commit 5353855e9d
1 changed files with 0 additions and 8 deletions
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8
configure.ac
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@ -306,10 +306,6 @@ if test "x$GCC" = xyes; then
# We don't want floating-point math functions to set errno or trap
CFLAGS="$CFLAGS -fno-math-errno -fno-trapping-math"
# gcc's builtin memcmp is slower than glibc's
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
CFLAGS="$CFLAGS -fno-builtin-memcmp"
# Flags to help ensure that certain portions of the code -- and only those
# portions -- can be built with MSVC:
# - src/util, src/gallium/auxiliary, rc/gallium/drivers/llvmpipe, and
@ -348,10 +344,6 @@ if test "x$GXX" = xyes; then
# Work around aliasing bugs - developers should comment this out
CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
# gcc's builtin memcmp is slower than glibc's
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
CXXFLAGS="$CXXFLAGS -fno-builtin-memcmp"
fi
AC_SUBST([MSVC2013_COMPAT_CFLAGS])