From c0ba1bc49b2b544159425e3c4769a8bbf1635a3e Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 1 Mar 2007 02:27:30 +0000
Subject: [PATCH] A restore is promoted to copy (or deleted entirely), remove
the kill from the last use of the targetted register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34773 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/CodeGen/VirtRegMap.cpp | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index ceb4acee698..0f5c48aaa9b 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -855,14 +855,15 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
} else
DOUT << "Removing now-noop copy: " << MI;
- // Extend the live range of the MI that last kill the register if
- // the next MI reuse it.
+ // Either way, the live range of the last kill of InReg has been
+ // extended. Remove its kill.
MachineOperand *MOK = SSMI->findRegisterUseOperand(InReg, true);
if (MOK && NextMII != MBB.end()) {
+ MOK->unsetIsKill();
+ // If NextMII uses InReg (must be the copy?), mark it killed.
MachineOperand *MOU = NextMII->findRegisterUseOperand(InReg);
if (MOU) {
MOU->setIsKill();
- MOK->unsetIsKill();
Spills.UpdateLastUse(InReg, &(*NextMII));
}
}