Treat the label for the first @llvm.dbg.stoppoint the same way as the dbg_func_start label. Make sure nothing else is inserted before them.

Note this solution might be somewhat fragile since ISD::LABEL may be used for other
purposes. If that ends up to be an issue, we may need to introduce a different node
for debug labels.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46571 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 4 deletions

diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index bca197311f..2f8ee1dadd 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -525,11 +525,15 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
           X86FI->getCalleeSavedFrameSize() +(-TailCallReturnAddrDelta));
   uint64_t NumBytes = StackSize - X86FI->getCalleeSavedFrameSize();
 
-  // Skip over the label which mark the beginning of the function.
-  if (MMI && MMI->needsFrameInfo() &&
-      MBBI != MBB.end() &&
-      MBBI->getOpcode() == X86::LABEL)
+  // Skip over the labels which mark the beginning of the function.
+  if (MMI && MMI->needsFrameInfo()) {
+    unsigned NumLabels = 0;
+    while (NumLabels <= 1 &&
+           MBBI != MBB.end() && MBBI->getOpcode() == X86::LABEL) {
+      ++NumLabels;
       ++MBBI;
+    }
+  }
 
   // Insert stack pointer adjustment for later moving of return addr.  Only
   // applies to tail call optimized functions where the callee argument stack