[llvm] r326467 - AMDGPU/GlobalISel: Add copyCost for VGPR->SGPR copies

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Thu Mar  1 11:09:25 2018
New Revision: 326467

URL: http://llvm.org/viewvc/llvm-project?rev=326467&view=rev
Log:
AMDGPU/GlobalISel: Add copyCost for VGPR->SGPR copies

Patch by Tom Stellard

Modified:
    llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp?rev=326467&r1=326466&r2=326467&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp Thu Mar  1 11:09:25 2018
@@ -50,10 +50,13 @@ AMDGPURegisterBankInfo::AMDGPURegisterBa
 
 }
 
-unsigned AMDGPURegisterBankInfo::copyCost(const RegisterBank &A,
-                                           const RegisterBank &B,
-                                           unsigned Size) const {
-  return RegisterBankInfo::copyCost(A, B, Size);
+unsigned AMDGPURegisterBankInfo::copyCost(const RegisterBank &Dst,
+                                          const RegisterBank &Src,
+                                          unsigned Size) const {
+  if (Dst.getID() == AMDGPU::SGPRRegBankID &&
+      Src.getID() == AMDGPU::VGPRRegBankID)
+    return std::numeric_limits<unsigned>::max();
+  return RegisterBankInfo::copyCost(Dst, Src, Size);
 }
 
 const RegisterBank &AMDGPURegisterBankInfo::getRegBankFromRegClass(