vendor/llvm-project/llvmorg-14-init-11187-g222442ec2d71

1 files changed, 12 insertions, 2 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZFrameLowering.h b/llvm/lib/Target/SystemZ/SystemZFrameLowering.h
index 6fddb4f81c41..af219da79c32 100644
--- a/llvm/lib/Target/SystemZ/SystemZFrameLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZFrameLowering.h
@@ -29,7 +29,18 @@ public:
   create(const SystemZSubtarget &STI);
 
   // Override TargetFrameLowering.
-  bool isFPCloseToIncomingSP() const override { return false; }
+  bool allocateScavengingFrameIndexesNearIncomingSP(
+    const MachineFunction &MF) const override {
+    // SystemZ wants normal register scavenging slots, as close to the stack or
+    // frame pointer as possible.
+    // The default implementation assumes an x86-like layout, where the frame
+    // pointer is at the opposite end of the frame from the stack pointer.
+    // This meant that when frame pointer elimination was disabled,
+    // the slots ended up being as close as possible to the incoming
+    // stack pointer, which is the opposite of what we want on SystemZ.
+    return false;
+  }
+
   bool hasReservedCallFrame(const MachineFunction &MF) const override;
   MachineBasicBlock::iterator
   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
@@ -43,7 +54,6 @@ public:
   SystemZELFFrameLowering();
 
   // Override TargetFrameLowering.
-  bool isFPCloseToIncomingSP() const override { return false; }
   bool
   assignCalleeSavedSpillSlots(MachineFunction &MF,
                               const TargetRegisterInfo *TRI,