[llvm-commits] [llvm] r84641 - /llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp

[Jim Grosbach]

Author: grosbach
Date: Tue Oct 20 11:33:57 2009
New Revision: 84641

URL: http://llvm.org/viewvc/llvm-project?rev=84641&view=rev
Log:
Register re-use for scavenged frame indices must check for re-deginition
of the register in the instruction which kills the scavenged value.

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

Modified: llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp?rev=84641&r1=84640&r2=84641&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp (original)
+++ llvm/trunk/lib/CodeGen/PrologEpilogInserter.cpp Tue Oct 20 11:33:57 2009
@@ -873,6 +873,10 @@
             PrevLastUseOp = i;
             CurrentScratchReg = CurrentVirtReg = 0;
             havePrevValue = trackingCurrentValue;
+            // Re-scan the operands of this instruction to catch definitions
+            // of the scratch register we're using. This is to handle things
+            // like ldr "r2, [scratch]" where scratch is r2.
+            i = 0;
           }
         }
       RS->forward(MI);