Changes in directory llvm/lib/CodeGen:
VirtRegMap.cpp updated: 1.59 -> 1.60
---
Log message:
Mapping of physregs can make it so that the designated and input physregs are
the same. In this case, don't emit a noop copy.
---
Diffs of the changes: (+13 -0)
VirtRegMap.cpp | 13 +++++++++++++
1 files changed, 13 insertions(+)
Index: llvm/lib/CodeGen/VirtRegMap.cpp
diff -u llvm/lib/CodeGen/VirtRegMap.cpp:1.59
llvm/lib/CodeGen/VirtRegMap.cpp:1.60
--- llvm/lib/CodeGen/VirtRegMap.cpp:1.59 Thu Apr 27 20:46:50 2006
+++ llvm/lib/CodeGen/VirtRegMap.cpp Thu Apr 27 23:43:18 2006
@@ -611,6 +611,19 @@
DesignatedReg = ReusedOperands.GetRegForReload(DesignatedReg, &MI,
Spills, MaybeDeadStores);
+ // If the mapped designated register is actually the physreg we have
+ // incoming, we don't need to inserted a dead copy.
+ if (DesignatedReg == PhysReg) {
+ // If this stack slot value is already available, reuse it!
+ DEBUG(std::cerr << "Reusing SS#" << StackSlot << " from physreg "
+ << MRI->getName(PhysReg) << " for vreg"
+ << VirtReg
+ << " instead of reloading into same physreg.\n");
+ MI.SetMachineOperandReg(i, PhysReg);
+ ++NumReused;
+ continue;
+ }
+
const TargetRegisterClass* RC =
MBB.getParent()->getSSARegMap()->getRegClass(VirtReg);
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