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Rename Instruction::isIdenticalTo to Instruction::isIdenticalToWhenDefined,

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and introduce a new Instruction::isIdenticalTo which tests for full
identity, including the SubclassOptionalData flags. Also, fix the
Instruction::clone implementations to preserve the SubclassOptionalData
flags. Finally, teach several optimizations how to handle
SubclassOptionalData correctly, given these changes.

This fixes the counterintuitive behavior of isIdenticalTo not comparing
the full value, and clone not returning an identical clone, as well as
some subtle bugs that could be caused by these.

Thanks to Nick Lewycky for reporting this, and for an initial patch!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80038 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-25 22:11:20 +00:00
parent 415c8cf837
commit 58cfa3b137
10 changed files with 176 additions and 157 deletions
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3
lib/Transforms/IPO/MergeFunctions.cpp
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@ -188,7 +188,8 @@ static bool
isEquivalentOperation(const Instruction *I1, const Instruction *I2) {
if (I1->getOpcode() != I2->getOpcode() ||
I1->getNumOperands() != I2->getNumOperands() ||
!isEquivalentType(I1->getType(), I2->getType()))
!isEquivalentType(I1->getType(), I2->getType()) ||
!I1->hasSameSubclassOptionalData(I2))
return false;
// We have two instructions of identical opcode and #operands. Check to see