Sanjay Patel 6c39a3aae1 [InstCombine] fold not-shift of signbit to icmp+zext ...

https://alive2.llvm.org/ce/z/j_8Wz9

The arithmetic shift was converted to logical shift with:
246078604c

That does not seem to uncover any other missing/conflicting folds,
so convert directly to signbit test + cast.

We still need to fold the pattern with logical shift to test + cast.

This allows reducing patterns where the output type is not
the same as the input value:
https://alive2.llvm.org/ce/z/nydwFV

Fixes #57394

2022-08-29 10:06:31 -04:00

90 KiB

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