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Stroller <stroller@××××××××××××××××××.uk> writes: |
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|
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> But, surely "-march=" also instructs gcc to support the additional |
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> instructions. Suggest you re-read Daniel's post that I was replying |
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> to. |
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> |
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> What's the difference between supporting the "certain set of |
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> instructions" with "-march=" and doing so with USEs? |
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> |
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> Or doesn't "-march=" support additional "certain sets of |
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> instructions". What does it do, then? |
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|
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I am not sure, |
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|
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$ gcc -Q --help=target -march=core2 |
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The following options are target specific: |
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-m128bit-long-double [disabled] |
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-m32 [enabled] |
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-m3dnow [disabled] |
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-m3dnowa [disabled] |
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-m64 [disabled] |
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-m80387 [enabled] |
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-m96bit-long-double [enabled] |
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-mabm [disabled] |
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-maccumulate-outgoing-args [disabled] |
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-maes [disabled] |
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-malign-double [disabled] |
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-malign-functions= |
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-malign-jumps= |
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-malign-loops= |
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-malign-stringops [enabled] |
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-march= core2 |
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-masm= |
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-mavx [disabled] |
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-mbranch-cost= |
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-mcld [disabled] |
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-mcmodel= |
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-mcx16 [disabled] |
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-mfancy-math-387 [enabled] |
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-mfma [disabled] |
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-mforce-drap [disabled] |
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-mfp-ret-in-387 [enabled] |
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-mfpmath= |
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-mfused-madd [enabled] |
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-mglibc [enabled] |
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-mhard-float [enabled] |
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-mieee-fp [enabled] |
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-mincoming-stack-boundary= |
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-minline-all-stringops [disabled] |
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-minline-stringops-dynamically [disabled] |
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-mintel-syntax [disabled] |
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-mlarge-data-threshold= |
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-mmmx [disabled] |
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-mms-bitfields [disabled] |
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-mno-align-stringops [disabled] |
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-mno-fancy-math-387 [disabled] |
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-mno-fused-madd [disabled] |
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-mno-push-args [disabled] |
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-mno-red-zone [disabled] |
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-mno-sse4 [enabled] |
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-momit-leaf-frame-pointer [disabled] |
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-mpc |
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-mpclmul [disabled] |
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-mpopcnt [disabled] |
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-mpreferred-stack-boundary= |
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-mpush-args [enabled] |
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-mrecip [disabled] |
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-mred-zone [enabled] |
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-mregparm= |
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-mrtd [disabled] |
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-msahf [disabled] |
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-msoft-float [disabled] |
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-msse [disabled] |
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-msse2 [disabled] |
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-msse2avx [disabled] |
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-msse3 [disabled] |
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-msse4 [disabled] |
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-msse4.1 [disabled] |
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-msse4.2 [disabled] |
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-msse4a [disabled] |
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-msse5 [disabled] |
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-msseregparm [disabled] |
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-mssse3 [disabled] |
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-mstack-arg-probe [disabled] |
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-mstackrealign [enabled] |
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-mstringop-strategy= |
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-mtls-dialect= |
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-mtls-direct-seg-refs [enabled] |
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-mtune= |
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-muclibc [disabled] |
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-mveclibabi= |
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