Add some debug output when -instcombine uses RAUW. This can make debug output for those cases much clearer since without this it only showed that the original instruction was removed, not what it was replaced with.
llvm-svn: 128399
diff --git a/llvm/lib/Transforms/InstCombine/InstCombine.h b/llvm/lib/Transforms/InstCombine/InstCombine.h
index 0da962a..d5de53a 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombine.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombine.h
@@ -246,7 +246,10 @@
// segment of unreachable code, so just clobber the instruction.
if (&I == V)
V = UndefValue::get(I.getType());
-
+
+ DEBUG(errs() << "IC: Replacing " << I << "\n"
+ " with " << *V << '\n');
+
I.replaceAllUsesWith(V);
return &I;
}