From d35d19ca1dfa8b3b1312127d5744971f3c8f3c87 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Tue, 2 Oct 2012 21:24:45 +0000 Subject: [PATCH] Document -mprefer-avx128 Backported from mainline PR target/54785 * doc/invoke.texi: Document -mprefer-avx128. From-SVN: r192009 --- gcc/ChangeLog | 8 ++++++++ gcc/doc/invoke.texi | 8 +++++++- 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3bdfda68265a..a47020082128 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,11 @@ +2012-10-02 H.J. Lu + + Backported from mainline + 2012-10-02 H.J. Lu + + PR target/54785 + * doc/invoke.texi: Document -mprefer-avx128. + 2012-10-02 H.J. Lu Backported from mainline diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 45bfec87aceb..4e56044d8fc5 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -598,7 +598,8 @@ Objective-C and Objective-C++ Dialects}. -mno-wide-multiply -mrtd -malign-double @gol -mpreferred-stack-boundary=@var{num} -mincoming-stack-boundary=@var{num} @gol --mcld -mcx16 -msahf -mmovbe -mcrc32 -mrecip -mvzeroupper @gol +-mcld -mcx16 -msahf -mmovbe -mcrc32 -mrecip @gol +-mvzeroupper -mprefer-avx128 @gol -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -mavx @gol -maes -mpclmul -mfsgsbase -mrdrnd -mf16c -mfused-madd @gol -msse4a -m3dnow -mpopcnt -mabm -mbmi -mtbm -mfma4 -mxop -mlwp @gol @@ -12705,6 +12706,11 @@ before a transfer of control flow out of the function to minimize AVX to SSE transition penalty as well as remove unnecessary zeroupper intrinsics. +@item -mprefer-avx128 +@opindex mprefer-avx128 +This option instructs GCC to use 128-bit AVX instructions instead of +256-bit AVX instructions in the auto-vectorizer. + @item -mcx16 @opindex mcx16 This option will enable GCC to use CMPXCHG16B instruction in generated code. -- 2.47.2