Messages in this thread | | | Date | Mon, 20 Aug 2012 11:42:34 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH 46/74] x86, lto: Disable fancy hweight optimizations for LTO |
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> > config ARCH_HWEIGHT_CFLAGS > > string > > - default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 > > - default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 > > + default "-fcall-saved-ecx -fcall-saved-edx" if X86_32 && !LTO > > + default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64 && !LTO > > + default "" if LTO > > > > Seems heavy handed. How about using __attribute__((optimize(...))) instead?
Doesn't work for this. In fact according to the gcc developers that attribute is mostly broken.
-Andi
-- ak@linux.intel.com -- Speaking for myself only.
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