1 files changed, 9 insertions, 1 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
index e60f1397b993..8f3ad167ae41 100644
--- a/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
+++ b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyFrameLowering.cpp
@@ -130,7 +130,15 @@ bool WebAssemblyFrameLowering::hasReservedCallFrame(
 bool WebAssemblyFrameLowering::needsSPForLocalFrame(
     const MachineFunction &MF) const {
   auto &MFI = MF.getFrameInfo();
-  return MFI.getStackSize() || MFI.adjustsStack() || hasFP(MF);
+  auto &MRI = MF.getRegInfo();
+  // llvm.stacksave can explicitly read SP register and it can appear without
+  // dynamic alloca.
+  bool HasExplicitSPUse =
+      any_of(MRI.use_operands(getSPReg(MF)),
+             [](MachineOperand &MO) { return !MO.isImplicit(); });
+
+  return MFI.getStackSize() || MFI.adjustsStack() || hasFP(MF) ||
+         HasExplicitSPUse;
 }
 
 // In function with EH pads, we need to make a copy of the value of