Amara Emerson d4f84df0a0 [GlobalISel] Change widenScalar of G_FCONSTANT to mutate into G_CONSTANT. ...

Widening a G_FCONSTANT by extending and then generating G_FPTRUNC doesn't produce
the same result all the time. Instead, we can just transform it to a G_CONSTANT
of the same bit pattern and truncate using a plain G_TRUNC instead.

Fixes https://github.com/llvm/llvm-project/issues/56454

Differential Revision: https://reviews.llvm.org/D129743

2022-07-14 11:05:10 -07:00

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