[llvm] be00190 - [TII][X86] Do not schedule frame-setup/frame-destory instructions (#96611)

[via llvm-commits]

Author: Haohai Wen
Date: 2024-06-26T17:08:59+08:00
New Revision: be00190ce35807c8586ee4e2e61507fc0221e825

URL: https://github.com/llvm/llvm-project/commit/be00190ce35807c8586ee4e2e61507fc0221e825
DIFF: https://github.com/llvm/llvm-project/commit/be00190ce35807c8586ee4e2e61507fc0221e825.diff

LOG: [TII][X86] Do not schedule frame-setup/frame-destory instructions (#96611)

frame-setup/frame-destroy instruction can not be scheduled around by
PostRAScheduler. Their order is critical for SEH.

Added: 
    

Modified: 
    llvm/lib/Target/X86/X86InstrInfo.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 1a43d5c17080e..069a1ec9a5988 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -8832,6 +8832,11 @@ bool X86InstrInfo::isSchedulingBoundary(const MachineInstr &MI,
       Opcode == X86::PLDTILECFGV)
     return true;
 
+  // Frame setup and destory can't be scheduled around.
+  if (MI.getFlag(MachineInstr::FrameSetup) ||
+      MI.getFlag(MachineInstr::FrameDestroy))
+    return true;
+
   return TargetInstrInfo::isSchedulingBoundary(MI, MBB, MF);
 }