[llvm-commits] [llvm] r150528 - /llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Tue Feb 14 17:46:24 2012
New Revision: 150528

URL: http://llvm.org/viewvc/llvm-project?rev=150528&view=rev
Log:
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.

Modified:
    llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

Modified: llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp?rev=150528&r1=150527&r2=150528&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp Tue Feb 14 17:46:24 2012
@@ -507,7 +507,7 @@
       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: