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963,25
2018 Feb 28
3
how to simplify FP ops with an undef operand?
%y = fadd float %x, undef
Can we simplify this?
Currently in IR, we do nothing for fadd/fsub/fmul. For fdiv/frem, we
propagate undef. The code comment for fdiv/frem says:
"the undef could be a snan"
If that's correct, then shouldn't it be the same for fadd/fsub/fmul? But
this can't be correct because we support targets that don't raise
exceptions...and even targets