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Added recognition for signed add/sub/mul with overflow intrinsics to GVN as per Chris and Frits suggestion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134777 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2011-07-09 00:25:11 +00:00
parent 56573cc1ae
commit bd1828c6ed
1 changed files with 3 additions and 0 deletions
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lib/Transforms/Scalar/GVN.cpp
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@ -173,12 +173,15 @@ Expression ValueTable::create_extractvalue_expression(ExtractValueInst *EI) {
// is we'll synthesize a semantically equivalent expression instead on
// an extract value expression.
switch (I->getIntrinsicID()) {
case Intrinsic::sadd_with_overflow:
case Intrinsic::uadd_with_overflow:
e.opcode = Instruction::Add;
break;
case Intrinsic::ssub_with_overflow:
case Intrinsic::usub_with_overflow:
e.opcode = Instruction::Sub;
break;
case Intrinsic::smul_with_overflow:
case Intrinsic::umul_with_overflow:
e.opcode = Instruction::Mul;
break;