AMDGPU: Set high getCSRFirstUseCost

llvm-svn: 304416

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIRegisterInfo.h b/llvm/lib/Target/AMDGPU/SIRegisterInfo.h
index b91cdddc552..a648c178101 100644
--- a/llvm/lib/Target/AMDGPU/SIRegisterInfo.h
+++ b/llvm/lib/Target/AMDGPU/SIRegisterInfo.h
@@ -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;