From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 14 Feb 2012 23:46:24 +0000 (+0000)
Subject: Use the proper clobber check in handleLiveInRegister().
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=6b7913893bcd47f52eff71e39e50c42511c4ed36;p=oota-llvm.git

Use the proper clobber check in handleLiveInRegister().

When a physreg is live in to a basic block, look for any instruction in
the block that clobbers the physreg.

The instruction doesn't have to properly redefine the register, any
overlapping clobber is OK.

This slightly changes live ranges when compiling with register masks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150528 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 32f4c5b3ff6..30374da18f2 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -507,7 +507,7 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
       end = baseIndex.getRegSlot();
       SeenDefUse = true;
       break;
-    } else if (mi->definesRegister(interval.reg, tri_)) {
+    } else if (mi->modifiesRegister(interval.reg, tri_)) {
       // Another instruction redefines the register before it is ever read.
       // Then the register is essentially dead at the instruction that defines
       // it. Hence its interval is: