Don't generate line&scope debug info for meta-instructions.
MachineInstructions that don't generate any code (such as
IMPLICIT_DEFs) should not generate any debug info either.
Fixes PR33107.
https://bugs.llvm.org/show_bug.cgi?id=33107
This reapplies r303566 without any modifications. The stage2 build
failures persisted even after reverting this patch, and looking back
through history, it looks like these tests are flaky.
llvm-svn: 303575
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 3410b98..8fb3db2 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1029,7 +1029,7 @@
assert(CurMI);
// Check if source location changes, but ignore DBG_VALUE and CFI locations.
- if (MI->isDebugValue() || MI->isCFIInstruction())
+ if (MI->isMetaInstruction())
return;
const DebugLoc &DL = MI->getDebugLoc();
// When we emit a line-0 record, we don't update PrevInstLoc; so look at
@@ -1111,7 +1111,7 @@
// the beginning of the function body.
for (const auto &MBB : *MF)
for (const auto &MI : MBB)
- if (!MI.isDebugValue() && !MI.getFlag(MachineInstr::FrameSetup) &&
+ if (!MI.isMetaInstruction() && !MI.getFlag(MachineInstr::FrameSetup) &&
MI.getDebugLoc())
return MI.getDebugLoc();
return DebugLoc();