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Instruction::isIdenticalToWhenDefined(): Check getNumOperands() in advance of std::equal(op) to appease MSVC Debug build.

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MSVC Debug build is confused with (possibly invalid) op_begin(), if op_begin() == op_end().

llvm-svn: 210000
This commit is contained in:
NAKAMURA Takumi 2014-06-02 01:35:34 +00:00
parent 80b2be2884
commit bc730b170e
1 changed files with 4 additions and 0 deletions
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4
lib/IR/Instruction.cpp
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@ -331,6 +331,10 @@ bool Instruction::isIdenticalToWhenDefined(const Instruction *I) const {
getType() != I->getType())
return false;
// If both instructions have no operands, they are identical.
if (getNumOperands() == 0 && I->getNumOperands() == 0)
return haveSameSpecialState(this, I);
// We have two instructions of identical opcode and #operands. Check to see
// if all operands are the same.
if (!std::equal(op_begin(), op_end(), I->op_begin()))