Fix a bug that caused SimplifyCFG to drop DebugLocs.
Instruction::dropUnknownMetadata(KnownSet) is supposed to preserve all
metadata in KnownSet, but the condition for DebugLocs was inverted.
Most users of dropUnknownMetadata() actually worked around this by not
adding LLVMContext::MD_dbg to their list of KnowIDs.
This is now made explicit.
llvm-svn: 245589
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 7145581..02e17d3 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1093,6 +1093,7 @@
I2->replaceAllUsesWith(I1);
I1->intersectOptionalDataWith(I2);
unsigned KnownIDs[] = {
+ LLVMContext::MD_dbg,
LLVMContext::MD_tbaa,
LLVMContext::MD_range,
LLVMContext::MD_fpmath,