Florian Hahn 40d952b874 [CGP] Avoid replacing a free ext with multiple other exts. (#77094) ...

Replacing a free extension with 2 or more extensions unnecessarily
increases the number of IR instructions without providing any benefits.
It also unnecessarily causes operations to be performed on wider types
than necessary.

In some cases, the extra extensions also pessimize codegen (see
bfis-in-loop.ll).

The changes in arm64-codegen-prepare-extload.ll also show that we avoid
promotions that should only be performed in stress mode.

PR: https://github.com/llvm/llvm-project/pull/77094

2024-01-18 10:48:10 +00:00

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