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[BranchFolding] Document why replacing HashMachineInstr with hash_code doesn't work

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2015-06-23 14:47:36 +00:00
parent 336ead08bd
commit 530a616a9d
1 changed files with 3 additions and 1 deletions
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lib/CodeGen/BranchFolding.cpp
+3 -1
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@@ -270,7 +270,9 @@ static unsigned HashMachineInstr(const MachineInstr *MI) {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &Op = MI->getOperand(i);
// Merge in bits from the operand if easy.
// Merge in bits from the operand if easy. We can't use MachineOperand's
// hash_code here because it's not deterministic and we sort by hash value
// later.
unsigned OperandHash = 0;
switch (Op.getType()) {
case MachineOperand::MO_Register: