[llvm] r326069 - [XCore] Return true in enableMultipleCopyHints().

[Jonas Paulsson via llvm-commits]

Author: jonpa
Date: Mon Feb 26 00:03:32 2018
New Revision: 326069

URL: http://llvm.org/viewvc/llvm-project?rev=326069&view=rev
Log:
[XCore]  Return true in enableMultipleCopyHints().

Enable multiple COPY hints to eliminate more COPYs during register allocation.

Note that this is something all targets should do, see
https://reviews.llvm.org/D38128.

Review: Robert Lytton

Modified:
    llvm/trunk/lib/Target/XCore/XCoreRegisterInfo.h
    llvm/trunk/test/CodeGen/XCore/byVal.ll

Modified: llvm/trunk/lib/Target/XCore/XCoreRegisterInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/XCore/XCoreRegisterInfo.h?rev=326069&r1=326068&r2=326069&view=diff
==============================================================================
--- llvm/trunk/lib/Target/XCore/XCoreRegisterInfo.h (original)
+++ llvm/trunk/lib/Target/XCore/XCoreRegisterInfo.h Mon Feb 26 00:03:32 2018
@@ -33,6 +33,8 @@ public:
 
   BitVector getReservedRegs(const MachineFunction &MF) const override;
   
+  bool enableMultipleCopyHints() const override { return true; }
+
   bool requiresRegisterScavenging(const MachineFunction &MF) const override;
 
   bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;

Modified: llvm/trunk/test/CodeGen/XCore/byVal.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/XCore/byVal.ll?rev=326069&r1=326068&r2=326069&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/XCore/byVal.ll (original)
+++ llvm/trunk/test/CodeGen/XCore/byVal.ll Mon Feb 26 00:03:32 2018
@@ -38,13 +38,13 @@ entry:
 ; CHECK-LABEL: f2Test
 ; CHECK: extsp 4
 ; CHECK: stw lr, sp[1]
+; CHECK: mov r11, r1
 ; CHECK: stw r2, sp[3]
 ; CHECK: stw r3, sp[4]
 ; CHECK: ldw r0, r0[0]
 ; CHECK: stw r0, sp[2]
-; CHECK: ldaw r2, sp[2]
-; CHECK: mov r0, r1
-; CHECK: mov r1, r2
+; CHECK: ldaw r1, sp[2]
+; CHECK: mov r0, r11
 ; CHECK: bl f2
 ; CHECK: ldw lr, sp[1]
 ; CHECK: ldaw sp, sp[4]