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Improve comment to include that the use of a preg is also verboten in this situation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106119 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2010-06-16 18:01:31 +00:00
parent 0964b4a3f5
commit 504c0cda91
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/MachineSink.cpp
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@ -282,9 +282,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) {
if (MI->getParent() == SuccToSinkTo)
return false;
// If the instruction to move defines a dead physical register which is live
// when leaving the basic block, don't move it because it could turn into a
// "zombie" define of that preg. E.g., EFLAGS. (<rdar://problem/8030636>)
// If the instruction to move defines or uses a dead physical register which
// is live when leaving the basic block, don't move it because it could turn
// into a zombie define or misuse of that preg. E.g., EFLAGS.
// (<rdar://problem/8030636>)
for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
const MachineOperand &MO = MI->getOperand(I);
if (!MO.isReg()) continue;