Re: PATCH: PR target/54785: Document -mprefer-avx128

[Uros Bizjak]

On Tue, Oct 2, 2012 at 11:01 PM, H.J. Lu  wrote:
>
> This patch documents -mprefer-avx128.  OK for trunk and 4.7?
>
> 2012-10-02  H.J. Lu  
>
> PR target/54785
> * doc/invoke.texi: Document -mprefer-avx128.

OK everywhere.

Thanks,
Uros.

PATCH: PR target/54785: Document -mprefer-avx128

[H.J. Lu]

Hi,

This patch documents -mprefer-avx128.  OK for trunk and 4.7?

Thanks.


H.J.
---
2012-10-02  H.J. Lu  

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.