[llvm-commits] CVS: llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
Nate Begeman
natebegeman at mac.com
Mon Jun 13 20:55:35 PDT 2005
Changes in directory llvm/lib/Target/PowerPC:
PPC32ISelPattern.cpp updated: 1.92 -> 1.93
---
Log message:
Commit a small improvement that is already in the x86 and ia64 backends to
not generate unnecessary register copies. This improves compile time by
2-5% depending on the test.
---
Diffs of the changes: (+5 -0)
PPC32ISelPattern.cpp | 5 +++++
1 files changed, 5 insertions(+)
Index: llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp
diff -u llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp:1.92 llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp:1.93
--- llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp:1.92 Tue Jun 7 23:14:27 2005
+++ llvm/lib/Target/PowerPC/PPC32ISelPattern.cpp Mon Jun 13 22:55:23 2005
@@ -1572,6 +1572,11 @@
SDNode *Node = N.Val;
MVT::ValueType DestType = N.getValueType();
+ if (Node->getOpcode() == ISD::CopyFromReg &&
+ MRegisterInfo::isVirtualRegister(cast<RegSDNode>(Node)->getReg()))
+ // Just use the specified register as our input.
+ return cast<RegSDNode>(Node)->getReg();
+
unsigned &Reg = ExprMap[N];
if (Reg) return Reg;
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