AMDGPU/GlobalISel: Implement select() for 32-bit G_FADD and G_FMUL

Reviewers: arsenm, nhaehnle

Reviewed By: arsenm

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

Differential Revision: https://reviews.llvm.org/D46171

llvm-svn: 334665

lib/Target/AMDGPU/AMDGPUGISel.td

@@ -22,6 +22,10 @@ def gi_vop3mods0 :
     GIComplexOperandMatcher<s32, "selectVOP3Mods0">,
     GIComplexPatternEquiv<VOP3Mods0>;
 
+def gi_vop3mods :
+    GIComplexOperandMatcher<s32, "selectVOP3Mods">,
+    GIComplexPatternEquiv<VOP3Mods>;
+
 class GISelSop2Pat <
   SDPatternOperator node,
   Instruction inst,

lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp

@@ -508,6 +508,8 @@ bool AMDGPUInstructionSelector::select(MachineInstr &I,
   switch (I.getOpcode()) {
   default:
     break;
+  case TargetOpcode::G_FMUL:
+  case TargetOpcode::G_FADD:
   case TargetOpcode::G_FPTOUI:
   case TargetOpcode::G_OR:
     return selectImpl(I, CoverageInfo);
@@ -547,3 +549,11 @@ AMDGPUInstructionSelector::selectVOP3Mods0(MachineOperand &Root) const {
       [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }  // omod
   }};
 }
+
+InstructionSelector::ComplexRendererFns
+AMDGPUInstructionSelector::selectVOP3Mods(MachineOperand &Root) const {
+  return {{
+      [=](MachineInstrBuilder &MIB) { MIB.add(Root); },
+      [=](MachineInstrBuilder &MIB) { MIB.addImm(0); }  // src_mods
+  }};
+}

lib/Target/AMDGPU/AMDGPUInstructionSelector.h

@@ -75,6 +75,8 @@ private:
 
   InstructionSelector::ComplexRendererFns
   selectVOP3Mods0(MachineOperand &Root) const;
+  InstructionSelector::ComplexRendererFns
+  selectVOP3Mods(MachineOperand &Root) const;
 
   const SIInstrInfo &TII;
   const SIRegisterInfo &TRI;

test/CodeGen/AMDGPU/GlobalISel/inst-select-fadd.mir

@@ -0,0 +1,37 @@
+# RUN: llc -march=amdgcn -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s -check-prefixes=GCN
+
+--- |
+  define amdgpu_kernel void @fadd(i32 addrspace(1)* %global0) {ret void}
+...
+---
+
+name:            fadd
+legalized:       true
+regBankSelected: true
+
+# GCN-LABEL: name: fadd
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1, $vgpr3_vgpr4
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = COPY $vgpr1
+    %3:vgpr(s64) = COPY $vgpr3_vgpr4
+
+    ; fadd vs
+    ; GCN: V_ADD_F32_e64
+    %4:vgpr(s32) = G_FADD %1, %0
+
+    ; fadd sv
+    ; GCN: V_ADD_F32_e64
+    %5:vgpr(s32) = G_FADD %0, %1
+
+    ; fadd vv
+    ; GCN: V_ADD_F32_e64
+    %6:vgpr(s32) = G_FADD %1, %2
+
+    G_STORE %4, %3 :: (store 4 into %ir.global0)
+    G_STORE %5, %3 :: (store 4 into %ir.global0)
+    G_STORE %6, %3 :: (store 4 into %ir.global0)
+...
+---

test/CodeGen/AMDGPU/GlobalISel/inst-select-fmul.mir

@@ -0,0 +1,37 @@
+# RUN: llc -march=amdgcn -run-pass=instruction-select -verify-machineinstrs -global-isel %s -o - | FileCheck %s -check-prefixes=GCN
+
+--- |
+  define amdgpu_kernel void @fmul(i32 addrspace(1)* %global0) {ret void}
+...
+---
+
+name:            fmul
+legalized:       true
+regBankSelected: true
+
+# GCN-LABEL: name: fmul
+body: |
+  bb.0:
+    liveins: $sgpr0, $vgpr0, $vgpr1, $vgpr3_vgpr4
+    %0:sgpr(s32) = COPY $sgpr0
+    %1:vgpr(s32) = COPY $vgpr0
+    %2:vgpr(s32) = COPY $vgpr1
+    %3:vgpr(s64) = COPY $vgpr3_vgpr4
+
+    ; fmul vs
+    ; GCN: V_MUL_F32_e64
+    %4:vgpr(s32) = G_FMUL %1, %0
+
+    ; fmul sv
+    ; GCN: V_MUL_F32_e64
+    %5:vgpr(s32) = G_FMUL %0, %1
+
+    ; fmul vv
+    ; GCN: V_MUL_F32_e64
+    %6:vgpr(s32) = G_FMUL %1, %2
+
+    G_STORE %4, %3 :: (store 4 into %ir.global0)
+    G_STORE %5, %3 :: (store 4 into %ir.global0)
+    G_STORE %6, %3 :: (store 4 into %ir.global0)
+...
+---