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Document -mprefer-avx128

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PR target/54785
	* doc/invoke.texi: Document -mprefer-avx128.

From-SVN: r192007
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H.J. Lu 2012-10-02 21:11:21 +00:00 • committed by H.J. Lu
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-10-02 H.J. Lu <hongjiu.lu@intel.com>
PR target/54785
* doc/invoke.texi: Document -mprefer-avx128.
2012-10-02 Andrew Pinski <apinski@cavium.com>
* simplify-rtx.c (simplify_unary_operation_1 <case TRUNCATE>):

7
gcc/doc/invoke.texi
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@ -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.