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[AArch64][GlobalISel] Eliminate redundant G_ZEXT when the source is implicitly zext...
authorAmara Emerson <aemerson@apple.com>
Fri, 2 Aug 2019 21:15:36 +0000 (21:15 +0000)
committerAmara Emerson <aemerson@apple.com>
Fri, 2 Aug 2019 21:15:36 +0000 (21:15 +0000)
commitfd5b39fd11a7ad382578e03019eaadcbe6b24cf5
tree705c06f50fdae46e395ab1b51c495ad93c672b68tree | snapshot
parent296ab4b2adb90047c36ca1528b7a1f0fb29f5444commit | diff
[AArch64][GlobalISel] Eliminate redundant G_ZEXT when the source is implicitly zext-loaded.

These cases can come up when the extending loads combiner doesn't combine a
zext(load) to a zextload op, due to some other operation being in between, which
then gets simplified at a later stage.

Differential Revision: https://reviews.llvm.org/D65360

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367723 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/AArch64/AArch64InstructionSelector.cpp diff | blob | history
test/CodeGen/AArch64/GlobalISel/select-redundant-zext-of-load.mir [new file with mode: 0644] blob
test/CodeGen/AArch64/GlobalISel/select-zextload.mir diff | blob | history
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