Hi,
This patch documents -mprefer-avx128. OK for trunk and 4.7?
Thanks.
H.J.
---
2012-10-02 H.J. Lu <hongjiu...@intel.com>
PR target/54785
* doc/invoke.texi: Document -mprefer-avx128.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 7578dda..0e7e441 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -630,7 +630,7 @@ Objective-C and Objective-C++ Dialects}.
-mincoming-stack-boundary=@var{num} @gol
-mcld -mcx16 -msahf -mmovbe -mcrc32 @gol
-mrecip -mrecip=@var{opt} @gol
--mvzeroupper @gol
+-mvzeroupper -mprefer-avx128 @gol
-mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -mavx @gol
-mavx2 -maes -mpclmul -mfsgsbase -mrdrnd -mf16c -mfma @gol
-msse4a -m3dnow -mpopcnt -mabm -mbmi -mtbm -mfma4 -mxop -mlzcnt @gol
@@ -13926,6 +13926,11 @@ before a transfer of control flow out of the function
to minimize
the AVX to SSE transition penalty as well as remove unnecessary
@code{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 enables GCC to generate @code{CMPXCHG16B} instructions.
