Petar Avramovic f0d65f4096 AMDGPU/GlobalISel: Calculate isKnownNeverNaN for fminnum and fmaxnum ...

Implements same logis as in SelectionDAG.
G_FMINNUM_IEEE and G_FMAXNUM_IEEE are never SNaN by definition and
never NaN when one operand is known non-NaN and other known non-SNaN.
G_FMINNUM and G_FMAXNUM are never NaN/SNaN when one of the operands
is known non-NaN/SNaN.

Differential Revision: https://reviews.llvm.org/D91716

2021-02-12 17:14:34 +01:00

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