8ff8e3360b4fb8c1a745ba9405fac938d6ea6d38 - llvm

commit	8ff8e3360b4fb8c1a745ba9405fac938d6ea6d38	[log] [tgz]
author	Craig Topper <craig.topper@intel.com>	Thu Mar 21 17:50:49 2019 +0000
committer	Craig Topper <craig.topper@intel.com>	Thu Mar 21 17:50:49 2019 +0000
tree	e8193b59b80b27cba3bf2c0ea209676efc35155f
parent	25aad6c4139ed0a45ef7c0a0de047c89c8e3ab2a [diff]

[InstCombine] Don't transform ((C1 OP zext(X)) & C2) -> zext((C1 OP X) & C2) if either zext or OP has another use.

If they have other users we'll just end up increasing the instruction count.

We might be able to weaken this to only one of them having a single use if we can prove that the and will be removed.

Fixes PR41164.

Differential Revision: https://reviews.llvm.org/D59630

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356690 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/InstCombine/InstCombineAndOrXor.cpp[diff]
test/Transforms/InstCombine/pr41164.ll[diff]
test/Transforms/LoopVectorize/X86/small-size.ll[diff]
test/Transforms/LoopVectorize/if-conversion-nest.ll[diff]
test/Transforms/LoopVectorize/runtime-check.ll[diff]

5 files changed

tree: e8193b59b80b27cba3bf2c0ea209676efc35155f