Sanjay Patel 452279efe2 [InstCombine] prevent miscompiles from select-of-div/rem transform ...

This avoids the danger shown in issue #60906.
There were no regression tests for these patterns, so these potential
failures have been around for a long time.

We freeze the condition and preserve the optimization because
getting rid of a div/rem is always a win.

Here are a couple of examples that can be corrected by freezing the
condition:
https://alive2.llvm.org/ce/z/sXHTTC

Differential Revision: https://reviews.llvm.org/D144671

2023-03-01 08:54:23 -05:00

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