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cvtsi2ss
2011 Mar 22
0
[LLVMdev] sitofp inst selection in x86/AVX target [PR9473]
Hello LLVMer's
I am now trying to fix a bug PR9473.
sitofp instruction in LLVM IR is converted to vcvtsi2sd(also applied
to vcvtsi2ss case) for x86/AVX backend, but vcvtsi2sd is somewhat odd
instruction format.
VCVTSI2SD xmm1, xmm2, r/m32
VCVTSI2SD xmm1, xmm2, r/m64
bits(127:64) of xmm2 is copied to corresponding bits of xmm1, thus in
many case xmm1 and xmm2 could be same register.
Currently, the definition of VCVTSI2SD in X86...