R600/SI: Pattern match isinf to v_cmp_class instructions

llvm-svn: 225307

3 files changed, 79 insertions, 0 deletions

diff --git a/llvm/lib/Target/R600/SIISelLowering.cpp b/llvm/lib/Target/R600/SIISelLowering.cpp
index 9f0d7936785..0690792fb72 100644
--- a/llvm/lib/Target/R600/SIISelLowering.cpp
+++ b/llvm/lib/Target/R600/SIISelLowering.cpp
@@ -1400,6 +1400,37 @@ SDValue SITargetLowering::performMin3Max3Combine(SDNode *N,
   return SDValue();
 }
 
+SDValue SITargetLowering::performSetCCCombine(SDNode *N,
+                                              DAGCombinerInfo &DCI) const {
+  SelectionDAG &DAG = DCI.DAG;
+  SDLoc SL(N);
+
+  SDValue LHS = N->getOperand(0);
+  SDValue RHS = N->getOperand(1);
+  EVT VT = LHS.getValueType();
+
+  if (VT != MVT::f32 && VT != MVT::f64)
+    return SDValue();
+
+  // Match isinf pattern
+  // (fcmp oeq (fabs x), inf) -> (fp_class x, (p_infinity | n_infinity))
+  ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
+  if (CC == ISD::SETOEQ && LHS.getOpcode() == ISD::FABS) {
+    const ConstantFPSDNode *CRHS = dyn_cast<ConstantFPSDNode>(RHS);
+    if (!CRHS)
+      return SDValue();
+
+    const APFloat &APF = CRHS->getValueAPF();
+    if (APF.isInfinity() && !APF.isNegative()) {
+      unsigned Mask = SIInstrFlags::P_INFINITY | SIInstrFlags::N_INFINITY;
+      return DAG.getNode(AMDGPUISD::FP_CLASS, SL, MVT::i1,
+                         LHS.getOperand(0), DAG.getConstant(Mask, MVT::i32));
+    }
+  }
+
+  return SDValue();
+}
+
 SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
                                             DAGCombinerInfo &DCI) const {
   SelectionDAG &DAG = DCI.DAG;
@@ -1408,6 +1439,8 @@ SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
   switch (N->getOpcode()) {
   default:
     return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
+  case ISD::SETCC:
+    return performSetCCCombine(N, DCI);
   case ISD::FMAXNUM: // TODO: What about fmax_legacy?
   case ISD::FMINNUM:
   case AMDGPUISD::SMAX:
diff --git a/llvm/lib/Target/R600/SIISelLowering.h b/llvm/lib/Target/R600/SIISelLowering.h
index 4da86280711..44b25dcd844 100644
--- a/llvm/lib/Target/R600/SIISelLowering.h
+++ b/llvm/lib/Target/R600/SIISelLowering.h
@@ -62,6 +62,7 @@ class SITargetLowering : public AMDGPUTargetLowering {
   SDValue performClassCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 
   SDValue performMin3Max3Combine(SDNode *N, DAGCombinerInfo &DCI) const;
+  SDValue performSetCCCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 
 public:
   SITargetLowering(TargetMachine &tm);
diff --git a/llvm/test/CodeGen/R600/fp-classify.ll b/llvm/test/CodeGen/R600/fp-classify.ll
new file mode 100644
index 00000000000..e6ca5efd767
--- /dev/null
+++ b/llvm/test/CodeGen/R600/fp-classify.ll
@@ -0,0 +1,45 @@
+; RUN: llc -march=r600 -mcpu=SI -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
+
+declare i1 @llvm.AMDGPU.class.f32(float, i32) #1
+declare i1 @llvm.AMDGPU.class.f64(double, i32) #1
+declare i32 @llvm.r600.read.tidig.x() #1
+declare float @llvm.fabs.f32(float) #1
+declare double @llvm.fabs.f64(double) #1
+
+; SI-LABEL: {{^}}test_isinf_pattern:
+; SI: v_mov_b32_e32 [[MASK:v[0-9]+]], 0x204{{$}}
+; SI: v_cmp_class_f32_e32 vcc, s{{[0-9]+}}, [[MASK]]
+; SI-NOT: v_cmp
+; SI: s_endpgm
+define void @test_isinf_pattern(i32 addrspace(1)* nocapture %out, float %x) #0 {
+  %fabs = tail call float @llvm.fabs.f32(float %x) #1
+  %cmp = fcmp oeq float %fabs, 0x7FF0000000000000
+  %ext = zext i1 %cmp to i32
+  store i32 %ext, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; SI-LABEL: {{^}}test_not_isinf_pattern_0:
+; SI-NOT: v_cmp_class
+; SI: s_endpgm
+define void @test_not_isinf_pattern_0(i32 addrspace(1)* nocapture %out, float %x) #0 {
+  %fabs = tail call float @llvm.fabs.f32(float %x) #1
+  %cmp = fcmp ueq float %fabs, 0x7FF0000000000000
+  %ext = zext i1 %cmp to i32
+  store i32 %ext, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+; SI-LABEL: {{^}}test_not_isinf_pattern_1:
+; SI-NOT: v_cmp_class
+; SI: s_endpgm
+define void @test_not_isinf_pattern_1(i32 addrspace(1)* nocapture %out, float %x) #0 {
+  %fabs = tail call float @llvm.fabs.f32(float %x) #1
+  %cmp = fcmp oeq float %fabs, 0xFFF0000000000000
+  %ext = zext i1 %cmp to i32
+  store i32 %ext, i32 addrspace(1)* %out, align 4
+  ret void
+}
+
+attributes #0 = { nounwind }
+attributes #1 = { nounwind readnone }