[llvm] r304416 - AMDGPU: Set high getCSRFirstUseCost
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Thu Jun 1 07:38:02 PDT 2017
Author: arsenm
Date: Thu Jun 1 09:38:02 2017
New Revision: 304416
URL: http://llvm.org/viewvc/llvm-project?rev=304416&view=rev
Log:
AMDGPU: Set high getCSRFirstUseCost
Modified:
llvm/trunk/lib/Target/AMDGPU/SIRegisterInfo.h
Modified: llvm/trunk/lib/Target/AMDGPU/SIRegisterInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIRegisterInfo.h?rev=304416&r1=304415&r2=304416&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIRegisterInfo.h (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIRegisterInfo.h Thu Jun 1 09:38:02 2017
@@ -66,6 +66,12 @@ public:
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID) const override;
+ // Stack access is very expensive. CSRs are also the high registers, and we
+ // want to minimize the number of used registers.
+ unsigned getCSRFirstUseCost() const override {
+ return 100;
+ }
+
unsigned getFrameRegister(const MachineFunction &MF) const override;
bool requiresRegisterScavenging(const MachineFunction &Fn) const override;
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