[PATCH] D55494: [x86] allow 8-bit adds to be promoted by convertToThreeAddress() to form LEA
Craig Topper via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Dec 11 07:21:33 PST 2018
craig.topper accepted this revision.
craig.topper added a comment.
This revision is now accepted and ready to land.
LGTM
I don't think Sandy Bridge and Ivy Bridge are different here. Sandy Bridge should only insert a merge when AH is dirty. I can't find anywhere in Intel's optimization manual that says they are different. The description in 3.5.2.4 describes the behavior from Sandy Bridge on.
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https://reviews.llvm.org/D55494/new/
https://reviews.llvm.org/D55494
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