From: Juergen Ributzka <juergen@apple.com>
Date: Mon, 30 Mar 2015 22:45:56 +0000 (+0000)
Subject: Transfer implicit operands when expanding the RET_ReallyLR pseudo instruction.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1c8595529b9664fc919001e3f24da0830d68bef2;p=oota-llvm.git

Transfer implicit operands when expanding the RET_ReallyLR pseudo instruction.

When we expand the RET_ReallyLR pseudo instruction we also need to transfer the
implicit operands.

The return register is an implicit operand and without it the liveness
calculation generates an incorrect live-out set for the patchpoint.

This fixes rdar://problem/19068476.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233635 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp b/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
index 41b1132d3fd..c2470f747a3 100644
--- a/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
+++ b/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
@@ -698,12 +698,15 @@ bool AArch64ExpandPseudo::expandMI(MachineBasicBlock &MBB,
     return expandMOVImm(MBB, MBBI, 32);
   case AArch64::MOVi64imm:
     return expandMOVImm(MBB, MBBI, 64);
-  case AArch64::RET_ReallyLR:
-    BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(AArch64::RET))
-        .addReg(AArch64::LR);
+  case AArch64::RET_ReallyLR: {
+    MachineInstrBuilder MIB =
+        BuildMI(MBB, MBBI, MI.getDebugLoc(), TII->get(AArch64::RET))
+          .addReg(AArch64::LR);
+    transferImpOps(MI, MIB, MIB);
     MI.eraseFromParent();
     return true;
   }
+  }
   return false;
 }
 
diff --git a/test/CodeGen/AArch64/stackmap-liveness.ll b/test/CodeGen/AArch64/stackmap-liveness.ll
new file mode 100644
index 00000000000..91dcbb20cd8
--- /dev/null
+++ b/test/CodeGen/AArch64/stackmap-liveness.ll
@@ -0,0 +1,47 @@
+; RUN: llc < %s -mtriple=aarch64-apple-darwin | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+; CHECK-LABEL:  .section  __LLVM_STACKMAPS,__llvm_stackmaps
+; CHECK-NEXT:   __LLVM_StackMaps:
+; Header
+; CHECK-NEXT:   .byte 1
+; CHECK-NEXT:   .byte 0
+; CHECK-NEXT:   .short 0
+; Num Functions
+; CHECK-NEXT:   .long 1
+; Num LargeConstants
+; CHECK-NEXT:   .long   0
+; Num Callsites
+; CHECK-NEXT:   .long   1
+
+; Functions and stack size
+; CHECK-NEXT:   .quad _stackmap_liveness
+; CHECK-NEXT:   .quad 16
+
+; Test that the return register is recognized as an live-out.
+define i64 @stackmap_liveness(i1 %c) {
+; CHECK-LABEL:  .long L{{.*}}-_stackmap_liveness
+; CHECK-NEXT:   .short  0
+; CHECK-NEXT:   .short  0
+; Padding
+; CHECK-NEXT:   .short  0
+; Num LiveOut Entries: 1
+; CHECK-NEXT:   .short  2
+; LiveOut Entry 0: X0
+; CHECK-NEXT:   .short 0
+; CHECK-NEXT:   .byte 0
+; CHECK-NEXT:   .byte 8
+; LiveOut Entry 1: SP
+; CHECK-NEXT:   .short 31
+; CHECK-NEXT:   .byte 0
+; CHECK-NEXT:   .byte 8
+; Align
+; CHECK-NEXT:   .align  3
+  %1 = select i1 %c, i64 1, i64 2
+  call anyregcc void (i64, i32, i8*, i32, ...)* @llvm.experimental.patchpoint.void(i64 1, i32 32, i8* null, i32 0)
+  ret i64 %1
+}
+
+declare void @llvm.experimental.patchpoint.void(i64, i32, i8*, i32, ...)
+