[codeview] Ignore DBG_VALUEs when choosing a BB start source loc
When the first instruction of a basic block has no location (consider a
LEA materializing the address of an alloca for a call), we want to start
the line table for the block with the first valid source location in the
block. We need to ignore DBG_VALUE instructions during this scan to get
decent line tables.
llvm-svn: 309628
diff --git a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
index c9686cc..38ae15c 100644
--- a/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp
@@ -2157,6 +2157,8 @@
DebugLoc DL = MI->getDebugLoc();
if (!DL && MI->getParent() != PrevInstBB) {
for (const auto &NextMI : *MI->getParent()) {
+ if (NextMI.isDebugValue())
+ continue;
DL = NextMI.getDebugLoc();
if (DL)
break;