[PATCH] D96663: [InstCombine] Fold icmp (select c, const, arg), null if arg has nonnullattr
Nikita Popov via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Apr 24 08:16:39 PDT 2021
nikic added inline comments.
================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp:3210
+InstCombinerImpl::foldICmpInstWithConstantNotInt(ICmpInst &I,
+ const SimplifyQuery &Q) {
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
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As this is already on InstCombinerImpl, is the Q argument necessary?
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Comment at: llvm/test/Transforms/InstCombine/assume-icmp-null-select.ll:20
+ %4 = icmp ne i8* %.0.i, null
+ call void @llvm.assume(i1 %4)
+ ret i8* %.0.i
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I find the presence of assume in this example a bit confusing, as your transform does not actually use information from the assume. I'd replace it with a more generic "use".
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https://reviews.llvm.org/D96663/new/
https://reviews.llvm.org/D96663
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