[llvm] r326588 - AMDGPU/GlobalISel: InstrMapping for G_TRUNC

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Fri Mar  2 08:55:33 2018
New Revision: 326588

URL: http://llvm.org/viewvc/llvm-project?rev=326588&view=rev
Log:
AMDGPU/GlobalISel: InstrMapping for G_TRUNC

Added:
    llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/regbankselect-trunc.mir
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=326588&r1=326587&r2=326588&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp Fri Mar  2 08:55:33 2018
@@ -314,6 +314,16 @@ AMDGPURegisterBankInfo::getInstrMapping(
     OpdsMapping[0] = OpdsMapping[1] = AMDGPU::getValueMapping(BankID, Size);
     break;
   }
+  case AMDGPU::G_TRUNC: {
+    unsigned Dst = MI.getOperand(0).getReg();
+    unsigned Src = MI.getOperand(1).getReg();
+    unsigned Bank = getRegBankID(Src, MRI, *TRI);
+    unsigned DstSize = getSizeInBits(Dst, MRI, *TRI);
+    unsigned SrcSize = getSizeInBits(Src, MRI, *TRI);
+    OpdsMapping[0] = AMDGPU::getValueMapping(Bank, DstSize);
+    OpdsMapping[1] = AMDGPU::getValueMapping(Bank, SrcSize);
+    break;
+  }
   case AMDGPU::G_FCMP: {
     unsigned Size = MRI.getType(MI.getOperand(2).getReg()).getSizeInBits();
     unsigned Op2Bank = getRegBankID(MI.getOperand(2).getReg(), MRI, *TRI);

Added: llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/regbankselect-trunc.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/regbankselect-trunc.mir?rev=326588&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/regbankselect-trunc.mir (added)
+++ llvm/trunk/test/CodeGen/AMDGPU/GlobalISel/regbankselect-trunc.mir Fri Mar  2 08:55:33 2018
@@ -0,0 +1,31 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -mcpu=fiji -run-pass=regbankselect -global-isel %s -verify-machineinstrs -o - -regbankselect-fast | FileCheck %s
+# RUN: llc -march=amdgcn -mcpu=fiji -run-pass=regbankselect -global-isel %s -verify-machineinstrs -o - -regbankselect-greedy | FileCheck %s
+
+---
+name: trunc_i64_to_i32_s
+legalized: true
+
+body: |
+  bb.0:
+    liveins: $sgpr0_sgpr1
+    ; CHECK-LABEL: name: trunc_i64_to_i32_s
+    ; CHECK: [[COPY:%[0-9]+]]:sgpr(s32) = COPY $sgpr0
+    ; CHECK: [[TRUNC:%[0-9]+]]:sgpr(s32) = G_TRUNC [[COPY]](s32)
+    %0:_(s32) = COPY $sgpr0
+    %1:_(s32) = G_TRUNC %0
+...
+
+---
+name: trunc_i64_to_i32_v
+legalized: true
+
+body: |
+  bb.0:
+    liveins: $vgpr0_vgpr1
+    ; CHECK-LABEL: name: trunc_i64_to_i32_v
+    ; CHECK: [[COPY:%[0-9]+]]:vgpr(s32) = COPY $vgpr0
+    ; CHECK: [[TRUNC:%[0-9]+]]:vgpr(s32) = G_TRUNC [[COPY]](s32)
+    %0:_(s32) = COPY $vgpr0
+    %1:_(s32) = G_TRUNC %0
+...