[AArch64][Stackmaps] Optimize stackmap shadows on AArch64.

[oota-llvm.git] / lib / Target / AArch64 / AArch64AsmPrinter.cpp

diff --git a/lib/Target/AArch64/AArch64AsmPrinter.cpp b/lib/Target/AArch64/AArch64AsmPrinter.cpp
index 8bee4f513517d06f643b676cf088c577db08648d..08ee687d84a27062242d107ba9e3648adaf446b2 100644 (file)
--- a/lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ b/lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -381,8 +381,23 @@ void AArch64AsmPrinter::LowerSTACKMAP(MCStreamer &OutStreamer, StackMaps &SM,
   unsigned NumNOPBytes = MI.getOperand(1).getImm();
 
   SM.recordStackMap(MI);
-  // Emit padding.
   assert(NumNOPBytes % 4 == 0 && "Invalid number of NOP bytes requested!");
+
+  // Scan ahead to trim the shadow.
+  const MachineBasicBlock &MBB = *MI.getParent();
+  MachineBasicBlock::const_iterator MII(MI);
+  ++MII;
+  while (NumNOPBytes > 0) {
+    if (MII == MBB.end() || MII->isCall() ||
+        MII->getOpcode() == AArch64::DBG_VALUE ||
+        MII->getOpcode() == TargetOpcode::PATCHPOINT ||
+        MII->getOpcode() == TargetOpcode::STACKMAP)
+      break;
+    ++MII;
+    NumNOPBytes -= 4;
+  }
+
+  // Emit nops.
   for (unsigned i = 0; i < NumNOPBytes; i += 4)
     EmitToStreamer(OutStreamer, MCInstBuilder(AArch64::HINT).addImm(0));
 }