Samuel Parker 7bff37783f [SDAG] Check fminnum/fmaxnum for non-zero operand. ...

Currently, in TargetLowering, if the target does not support fminnum, we lower
to fminimum if neither operand could be a NaN. But this isn't quite correct
because fminnum and fminimum treat +/-0 differently; so, we need to prove that
one of the operands isn't a zero, or we don't have signed zeros.

Differential Revision: https://reviews.llvm.org/D143256

2023-02-07 10:54:23 +00:00

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