[PATCH] D80943: [X86] Add a flag to guard the wide load

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

See https://reviews.llvm.org/rL51019 for the original commit.

The benefits of matching loadi32 like this are:

1. mov is one byte shorter than movzx
2. We can fold the load into a subsequent 32-bit instruction in some cases.

And the downside, of course, is that if we're unlucky and create a hazard, there's a performance hit.


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https://reviews.llvm.org/D80943