[llvm-commits] [llvm] r99319 - /llvm/trunk/lib/CodeGen/MachineCSE.cpp
Evan Cheng
evan.cheng at apple.com
Tue Mar 23 13:33:48 PDT 2010
Author: evancheng
Date: Tue Mar 23 15:33:48 2010
New Revision: 99319
URL: http://llvm.org/viewvc/llvm-project?rev=99319&view=rev
Log:
Code clean up.
Modified:
llvm/trunk/lib/CodeGen/MachineCSE.cpp
Modified: llvm/trunk/lib/CodeGen/MachineCSE.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineCSE.cpp?rev=99319&r1=99318&r2=99319&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineCSE.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineCSE.cpp Tue Mar 23 15:33:48 2010
@@ -117,17 +117,15 @@
MachineBasicBlock::const_iterator I,
MachineBasicBlock::const_iterator E) {
unsigned LookAheadLeft = 5;
- while (LookAheadLeft--) {
+ while (LookAheadLeft) {
if (I == E)
// Reached end of block, register is obviously dead.
return true;
- if (I->isDebugValue()) {
- // These must not count against the limit.
- ++LookAheadLeft;
+ // Skip over dbg_value's.
+ while (I->isDebugValue())
++I;
- continue;
- }
+
bool SeenDef = false;
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = I->getOperand(i);
@@ -143,6 +141,8 @@
// See a def of Reg (or an alias) before encountering any use, it's
// trivially dead.
return true;
+
+ --LookAheadLeft;
++I;
}
return false;
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