floating-pointgood first issuellvm:instcombinemissed-optimization
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説明
https://alive2.llvm.org/ce/z/bKDTJd https://godbolt.org/z/v1qYrb5Ka
define float @src(float %0) {
entry:
%1 = fmul float %0, 0.000000e+00
%2 = fmul float %1, 3.000000e+00
ret float %2
}
define float @tgt(float %0) {
entry:
%1 = fmul float %0, 0.000000e+00
ret float %1
}
@jayfoad @regehr