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Fix optimization. %x = sub %x, %y does not imply that %y is zero.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42157 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2007-09-20 00:48:36 +00:00
parent 17207ddf38
commit e29578afd5
2 changed files with 103 additions and 1 deletions
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2
lib/Transforms/Scalar/PredicateSimplifier.cpp
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@@ -2001,7 +2001,7 @@ namespace {
if (!isRelatedBy(Known, Zero, ICmpInst::ICMP_NE)) break;
// otherwise, fall-through.
case Instruction::Sub:
if (Unknown == Op1) break;
if (Unknown == Op0) break;
// otherwise, fall-through.
case Instruction::Xor:
case Instruction::Add: