Introduce flag -mprefer-avx128 for the auto-vectorizer to generate only 128-bit avx insns.
* config/i386/i386.opt (mprefer-avx128): New flag. * config/i386/i386.c (ix86_preferred_simd_mode): Prefer 128-bit mode when the flag -mprefer-avx128 is on. From-SVN: r170681
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@ -1,3 +1,9 @@
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2011-03-04 Changpeng Fang <changpeng.fang@amd.com>
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* config/i386/i386.opt (mprefer-avx128): New flag.
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* config/i386/i386.c (ix86_preferred_simd_mode): Prefer 128-bit mode
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when the flag -mprefer-avx128 is on.
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2011-03-04 Richard Sandiford <richard.sandiford@linaro.org>
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* dwarf2out.c (compare_loc_operands): Fix address handling.
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@ -34747,9 +34747,9 @@ ix86_preferred_simd_mode (enum machine_mode mode)
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switch (mode)
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{
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case SFmode:
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return TARGET_AVX ? V8SFmode : V4SFmode;
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return (TARGET_AVX && !flag_prefer_avx128) ? V8SFmode : V4SFmode;
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case DFmode:
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return TARGET_AVX ? V4DFmode : V2DFmode;
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return (TARGET_AVX && !flag_prefer_avx128) ? V4DFmode : V2DFmode;
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case DImode:
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return V2DImode;
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case SImode:
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@ -266,6 +266,10 @@ Target RejectNegative Var(flag_dispatch_scheduler)
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Do dispatch scheduling if processor is bdver1 and Haifa scheduling
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is selected.
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mprefer-avx128
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Target Report Var(flag_prefer_avx128) Init(0)
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Use 128-bit AVX instructions instead of 256-bit AVX instructions in the auto-vectorizer.
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;; ISA support
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m32
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