Stephen Tozer 22687aa97b [CodeGen] Correctly handle non-standard cases in RemoveLoadsIntoFakeUses (#111551) ...

In the RemoveLoadsIntoFakeUses pass, we try to remove loads that are
only used by fake uses, as well as the fake use in question. There are
two existing errors with the pass however: it incorrectly examines every
operand of each FAKE_USE, when only the first is relevant (extra
operands will just be "killed" regs assigned by a previous pass), and it
ignores cases where the FAKE_USE register is not an exact match for the
loaded register, which is incorrect as regalloc may choose to load a
wider value than the FAKE_USE required pre-regalloc. This patch fixes
both of these cases.

2025-01-28 13:59:41 +00:00

6.9 KiB

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