Fix PR4528. This scavenger assertion is too strict. The two-address value is

killed by another operand.

There is probably a better fix. Either 1) scavenger can look at other operands, or
2) livevariables can be smarter about kill markers. Patches welcome.

llvm-svn: 78072

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp
index e1c8f2fe22e..0a29ef02bcb 100644
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/lib/CodeGen/RegisterScavenging.cpp
@@ -267,7 +267,8 @@ void RegScavenger::forward() {
     unsigned UseIdx;
     if (MI->isRegTiedToUseOperand(Idx, &UseIdx) &&
         !MI->getOperand(UseIdx).isUndef()) {
-      assert(isUsed(Reg) && "Using an undefined register!");
+      assert(!MI->getOperand(UseIdx).isKill() &&
+             "Using an undefined register!");
       continue;
     }