[llvm] r253520 - [AArch64] Enable shrink-wrapping by default.

[Quentin Colombet via llvm-commits]

Author: qcolombet
Date: Wed Nov 18 17:12:20 2015
New Revision: 253520

URL: http://llvm.org/viewvc/llvm-project?rev=253520&view=rev
Log:
[AArch64] Enable shrink-wrapping by default.

Differential Revision: http://reviews.llvm.org/D14360

rdar://problem/20820748

Modified:
    llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.h
    llvm/trunk/test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll

Modified: llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.h?rev=253520&r1=253519&r2=253520&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.h (original)
+++ llvm/trunk/lib/Target/AArch64/AArch64FrameLowering.h Wed Nov 18 17:12:20 2015
@@ -60,6 +60,11 @@ public:
 
   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                             RegScavenger *RS) const override;
+
+  /// Returns true if the target will correctly handle shrink wrapping.
+  bool enableShrinkWrapping(const MachineFunction &MF) const override {
+    return true;
+  }
 };
 
 } // End llvm namespace

Modified: llvm/trunk/test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll?rev=253520&r1=253519&r2=253520&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll (original)
+++ llvm/trunk/test/CodeGen/AArch64/aarch64-dynamic-stack-layout.ll Wed Nov 18 17:12:20 2015
@@ -522,10 +522,10 @@ bb1:
 
 ; CHECK-LABEL: realign_conditional2
 ; Extra realignment in the prologue (performance issue).
+; CHECK:  tbz  {{.*}} .[[LABEL:.*]]
 ; CHECK:  sub  x9, sp, #32            // =32
 ; CHECK:  and  sp, x9, #0xffffffffffffffe0
 ; CHECK:  mov   x19, sp
-; CHECK:  tbz  {{.*}} .[[LABEL:.*]]
 ; Stack is realigned in a non-entry BB.
 ; CHECK:  sub  [[REG:x[01-9]+]], sp, #64
 ; CHECK:  and  sp, [[REG]], #0xffffffffffffffe0