tree 27a4e5c8a606c93c0f6c2105175c3e96bb9f7e7b
parent a5103c85c32f5c6a6e09f2893a70fd009451b977
author Craig Topper <craig.topper@sifive.com> 1659648554 -0700
committer Copybara-Service <copybara-worker@google.com> 1659649059 -0700

[RISCV] Relax another one use restriction in performSRACombine.

When folding (sra (add (shl X, 32), C1), 32 - C) -> (shl (sext_inreg (add X, C1), i32), C)
it's possible that the add is used by multiple sras. We should
allow the combine if all the SRAs will eventually be updated.

After transforming all of the sras, the shls will share a single
(sext_inreg (add X, C1), i32).

This pattern occurs if an sra with 32 is used as index in multiple
GEPs with different scales. The shl from the GEPs will be combined
with the sra before we get a chance to match the sra pattern.

GitOrigin-RevId: 12a1ca9c42c45cfb4777a42f73db5d33e87577e4