AMDGPU/GlobalISel: Implement select() for 32-bit G_FPTOUI

Reviewers: arsenm, nhaehnle

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

Differential Revision: https://reviews.llvm.org/D45883

llvm-svn: 332082

llvm/lib/Target/AMDGPU/AMDGPUGISel.td

@@ -18,6 +18,10 @@ def gi_vsrc0 :
     GIComplexOperandMatcher<s32, "selectVSRC0">,
     GIComplexPatternEquiv<sd_vsrc0>;
 
+def gi_vop3mods0 :
+    GIComplexOperandMatcher<s32, "selectVOP3Mods0">,
+    GIComplexPatternEquiv<VOP3Mods0>;
+
 class GISelSop2Pat <
   SDPatternOperator node,
   Instruction inst,

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -455,6 +455,7 @@ bool AMDGPUInstructionSelector::select(MachineInstr &I,
   switch (I.getOpcode()) {
   default:
     break;
+  case TargetOpcode::G_FPTOUI:
   case TargetOpcode::G_OR:
     return selectImpl(I, CoverageInfo);
   case TargetOpcode::G_ADD:
@@ -482,3 +483,13 @@ AMDGPUInstructionSelector::selectVSRC0(MachineOperand &Root) const {
       [=](MachineInstrBuilder &MIB) { MIB.add(Root); }
   }};
 }
+
+InstructionSelector::ComplexRendererFns
+AMDGPUInstructionSelector::selectVOP3Mods0(MachineOperand &Root) const {
+  return {{
+      [=](MachineInstrBuilder &MIB) { MIB.add(Root); },
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }, // src0_mods
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }, // clamp
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }  // omod
+  }};
+}

llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h

@@ -73,6 +73,9 @@ private:
   InstructionSelector::ComplexRendererFns
   selectVSRC0(MachineOperand &Root) const;
 
+  InstructionSelector::ComplexRendererFns
+  selectVOP3Mods0(MachineOperand &Root) const;
+
   const SIInstrInfo &TII;
   const SIRegisterInfo &TRI;
   const AMDGPURegisterBankInfo &RBI;

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

@@ -0,0 +1,36 @@
+# RUN: llc -march=amdgcn -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s -check-prefixes=GCN
+
+--- |
+  define amdgpu_kernel void @fptoui(i32 addrspace(1)* %global0) {ret void}
+...
+---
+
+name:            fptoui
+legalized:       true
+regBankSelected: true
+
+# GCN-LABEL: name: fptoui
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr3_vgpr4
+
+    ; GCN: [[SGPR:%[0-9]+]]:sreg_32_xm0 = COPY $sgpr0
+    %0:sgpr(s32) = COPY $sgpr0
+
+    ; GCN: [[VGPR:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+
+    %2:vgpr(s64) = COPY $vgpr3_vgpr4
+
+    ; fptoui s
+    ; GCN: V_CVT_U32_F32_e64 0, [[SGPR]], 0, 0
+    %3:vgpr(s32) = G_FPTOUI %0
+
+    ; fptoui v
+    ; GCN: V_CVT_U32_F32_e64 0, [[VGPR]], 0, 0
+    %4:vgpr(s32) = G_FPTOUI %1
+
+    G_STORE %3, %2 :: (store 4 into %ir.global0)
+    G_STORE %4, %2 :: (store 4 into %ir.global0)
+...
+---