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[MachineCopyPropagation] Fix comment. NFC 

Reviewers: MatzeB, qcolombet, jmolloy, mcrosier

Subscribers: llvm-commits, mcrosier

Differential Revision: http://reviews.llvm.org/D16806

llvm-svn: 259656
This commit is contained in:
Jun Bum Lim 2016-02-03 15:56:27 +00:00
parent 3b1a2dbffa
commit 59df5e89c2
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/CodeGen/MachineCopyPropagation.cpp
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@ -182,7 +182,8 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
}
}
// If Src is defined by a previous copy, it cannot be eliminated.
// If Src is defined by a previous copy, the previous copy cannot be
// eliminated.
for (MCRegAliasIterator AI(Src, TRI, true); AI.isValid(); ++AI) {
CI = CopyMap.find(*AI);
if (CI != CopyMap.end()) {
@ -196,7 +197,7 @@ bool MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
// Copy is now a candidate for deletion.
MaybeDeadCopies.insert(MI);
// If 'Src' is previously source of another copy, then this earlier copy's
// If 'Def' is previously source of another copy, then this earlier copy's
// source is no longer available. e.g.
// %xmm9<def> = copy %xmm2
// ...