AMDGPU/GlobalISel: Implement select() for COPY

Reviewers: arsenm, nhaehnle

Reviewed By: nhaehnle

Subscribers: kzhuravl, wdng, yaxunl, rovka, kristof.beyls, dstuttard, tpr, t-tye, llvm-commits

Differential Revision: https://reviews.llvm.org/D46151

llvm-svn: 335315

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -528,8 +528,11 @@ bool AMDGPUInstructionSelector::selectG_LOAD(MachineInstr &I) const {
 bool AMDGPUInstructionSelector::select(MachineInstr &I,
                                        CodeGenCoverage &CoverageInfo) const {
 
-  if (!isPreISelGenericOpcode(I.getOpcode()))
+  if (!isPreISelGenericOpcode(I.getOpcode())) {
+    if (I.isCopy())
+      return selectCOPY(I);
     return true;
+  }
 
   switch (I.getOpcode()) {
   default:

llvm/test/CodeGen/AMDGPU/GlobalISel/inst-select-copy.mir

@@ -0,0 +1,27 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s -check-prefixes=GCN
+
+--- |
+  define amdgpu_kernel void @copy(i32 addrspace(1)* %global0) {ret void}
+...
+---
+
+name:            copy
+legalized:       true
+regBankSelected: true
+
+
+body: |
+  bb.0:
+    liveins: $sgpr2_sgpr3
+    ; GCN-LABEL: name: copy
+    ; GCN: [[COPY:%[0-9]+]]:sreg_64_xexec = COPY $sgpr2_sgpr3
+    ; GCN: [[COPY1:%[0-9]+]]:vreg_64 = COPY [[COPY]]
+    ; GCN: [[DEF:%[0-9]+]]:vgpr_32 = IMPLICIT_DEF
+    ; GCN: FLAT_STORE_DWORD [[COPY1]], [[DEF]], 0, 0, 0, implicit $exec, implicit $flat_scr
+    %0:sgpr(s64) = COPY $sgpr2_sgpr3
+    %1:vgpr(s64) = COPY %0
+    %2:vgpr(s32) = G_IMPLICIT_DEF
+    G_STORE %2, %1 :: (store 4 into %ir.global0)
+...
+---