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vzeroupperinserter
2012 Nov 07
1
[LLVMdev] AVX support
We have been using LLVM 3.1 to support JITing of AVX. From dumping the MC generating by the MCJIT I noticed it always emits 'VZEROUPPER' to clear the high 128 bit before calling another function. In some cases I know the function called either only use AVX or does not use SSE. I will like to inform the backend it is safe not to emit that instruction.
Have not been able to figure out how