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1035115
2013 Dec 19
4
[LLVMdev] [Proposal] function attribute to reduce emission of vzeroupper instructions
Hi all,
I would like to find out whether anyone will find it useful to add an x86-
specific calling convention for reducing emission of vzeroupper instructions.
Current implementation:
vzeroupper is inserted to any functions that use AVX instructions. The
insertion points are:
1) before a call instruction;
2) before a return instruction;
Background:
vzeroupper is an AVX instruction; it is