[PATCH] D106760: [AArch64] Fix Local Deallocation for Homogeneous Prolog/Epilog

[Kyungwoo Lee via Phabricator via llvm-commits]

kyulee updated this revision to Diff 361488.
kyulee marked 2 inline comments as done.
kyulee added a comment.

Update the change per feedbacks.

- Add sub/add pair check.
- Check against the one target.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106760/new/

https://reviews.llvm.org/D106760

Files:
  llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
  llvm/test/CodeGen/AArch64/homogeneous-prolog-epilog-local.ll


Index: llvm/test/CodeGen/AArch64/homogeneous-prolog-epilog-local.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AArch64/homogeneous-prolog-epilog-local.ll
@@ -0,0 +1,23 @@
+; RUN: llc < %s -mtriple=arm64-apple-ios7.0  -homogeneous-prolog-epilog | FileCheck %s
+
+; CHECK-LABEL: _foo:
+; CHECK:        sub sp, sp, #16
+; CHECK:        bl  _goo
+; CHECK:        add sp, sp, #16
+
+define i32 @foo(i32 %c) nounwind minsize {
+entry:
+  %buffer = alloca [1 x i32], align 4
+  %0 = bitcast [1 x i32]* %buffer to i8*
+  call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0)
+  %arraydecay = getelementptr inbounds [1 x i32], [1 x i32]* %buffer, i64 0, i64 0
+  %call = call i32 @goo(i32* nonnull %arraydecay)
+  %sub = sub nsw i32 %c, %call
+  call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0)
+
+  ret i32 %sub
+}
+
+declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
+declare i32 @goo(i32*)
+declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
Index: llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
===================================================================
--- llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
+++ llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
@@ -1738,7 +1738,7 @@
 
     // Adjust local stack
     emitFrameOffset(MBB, LastPopI, DL, AArch64::SP, AArch64::SP,
-                    StackOffset::getFixed(-AFI->getLocalStackSize()), TII,
+                    StackOffset::getFixed(AFI->getLocalStackSize()), TII,
                     MachineInstr::FrameDestroy, false, NeedsWinCFI);
 
     // SP has been already adjusted while restoring callee save regs.


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