AMDGPU: Implement canonicalize

Also add generic DAG node for it.

llvm-svn: 266272

include/llvm/CodeGen/ISDOpcodes.h

@@ -257,6 +257,9 @@ namespace ISD {
     /// value as an integer 0/1 value.
     FGETSIGN,
 
+    /// Returns platform specific canonical encoding of a floating point number.
+    FCANONICALIZE,
+
     /// BUILD_VECTOR(ELT0, ELT1, ELT2, ELT3,...) - Return a vector with the
     /// specified, possibly variable, elements.  The number of elements is
     /// required to be a power of two.  The types of the operands must all be

include/llvm/Target/TargetSelectionDAG.td

@@ -434,6 +434,7 @@ def fmaxnum    : SDNode<"ISD::FMAXNUM"    , SDTFPBinOp,
 def fminnan    : SDNode<"ISD::FMINNAN"    , SDTFPBinOp>;
 def fmaxnan    : SDNode<"ISD::FMAXNAN"    , SDTFPBinOp>;
 def fgetsign   : SDNode<"ISD::FGETSIGN"   , SDTFPToIntOp>;
+def fcanonicalize : SDNode<"ISD::FCANONICALIZE", SDTFPUnaryOp>;
 def fneg       : SDNode<"ISD::FNEG"       , SDTFPUnaryOp>;
 def fsqrt      : SDNode<"ISD::FSQRT"      , SDTFPUnaryOp>;
 def fsin       : SDNode<"ISD::FSIN"       , SDTFPUnaryOp>;

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -5120,7 +5120,8 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
   case Intrinsic::trunc:
   case Intrinsic::rint:
   case Intrinsic::nearbyint:
-  case Intrinsic::round: {
+  case Intrinsic::round:
+  case Intrinsic::canonicalize: {
     unsigned Opcode;
     switch (Intrinsic) {
     default: llvm_unreachable("Impossible intrinsic");  // Can't reach here.
@@ -5134,6 +5135,7 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
     case Intrinsic::rint:      Opcode = ISD::FRINT;      break;
     case Intrinsic::nearbyint: Opcode = ISD::FNEARBYINT; break;
     case Intrinsic::round:     Opcode = ISD::FROUND;     break;
+    case Intrinsic::canonicalize: Opcode = ISD::FCANONICALIZE; break;
     }
 
     setValue(&I, DAG.getNode(Opcode, sdl,

lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp

@@ -202,6 +202,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
   case ISD::FREM:                       return "frem";
   case ISD::FCOPYSIGN:                  return "fcopysign";
   case ISD::FGETSIGN:                   return "fgetsign";
+  case ISD::FCANONICALIZE:              return "fcanonicalize";
   case ISD::FPOW:                       return "fpow";
   case ISD::SMIN:                       return "smin";
   case ISD::SMAX:                       return "smax";

lib/Target/AMDGPU/AMDGPUInstructions.td

@@ -423,6 +423,7 @@ int TWO_PI_INV = 0x3e22f983;
 int FP_UINT_MAX_PLUS_1 = 0x4f800000;    // 1 << 32 in floating point encoding
 int FP32_NEG_ONE = 0xbf800000;
 int FP32_ONE = 0x3f800000;
+int FP64_ONE = 0x3ff0000000000000;
 }
 def CONST : Constants;
 

lib/Target/AMDGPU/SIISelLowering.cpp

@@ -281,6 +281,7 @@ SITargetLowering::SITargetLowering(TargetMachine &TM,
   setTargetDAGCombine(ISD::AND);
   setTargetDAGCombine(ISD::OR);
   setTargetDAGCombine(ISD::UINT_TO_FP);
+  setTargetDAGCombine(ISD::FCANONICALIZE);
 
   // All memory operations. Some folding on the pointer operand is done to help
   // matching the constant offsets in the addressing modes.
@@ -2400,6 +2401,46 @@ SDValue SITargetLowering::performClassCombine(SDNode *N,
   return SDValue();
 }
 
+// Constant fold canonicalize.
+SDValue SITargetLowering::performFCanonicalizeCombine(
+  SDNode *N,
+  DAGCombinerInfo &DCI) const {
+  ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N->getOperand(0));
+  if (!CFP)
+    return SDValue();
+
+  SelectionDAG &DAG = DCI.DAG;
+  const APFloat &C = CFP->getValueAPF();
+
+  // Flush denormals to 0 if not enabled.
+  if (C.isDenormal()) {
+    EVT VT = N->getValueType(0);
+    if (VT == MVT::f32 && !Subtarget->hasFP32Denormals())
+      return DAG.getConstantFP(0.0, SDLoc(N), VT);
+
+    if (VT == MVT::f64 && !Subtarget->hasFP64Denormals())
+      return DAG.getConstantFP(0.0, SDLoc(N), VT);
+  }
+
+  if (C.isNaN()) {
+    EVT VT = N->getValueType(0);
+    APFloat CanonicalQNaN = APFloat::getQNaN(C.getSemantics());
+    if (C.isSignaling()) {
+      // Quiet a signaling NaN.
+      return DAG.getConstantFP(CanonicalQNaN, SDLoc(N), VT);
+    }
+
+    // Make sure it is the canonical NaN bitpattern.
+    //
+    // TODO: Can we use -1 as the canonical NaN value since it's an inline
+    // immediate?
+    if (C.bitcastToAPInt() != CanonicalQNaN.bitcastToAPInt())
+      return DAG.getConstantFP(CanonicalQNaN, SDLoc(N), VT);
+  }
+
+  return SDValue(CFP, 0);
+}
+
 static unsigned minMaxOpcToMin3Max3Opc(unsigned Opc) {
   switch (Opc) {
   case ISD::FMAXNUM:
@@ -2747,6 +2788,8 @@ SDValue SITargetLowering::PerformDAGCombine(SDNode *N,
     return performOrCombine(N, DCI);
   case AMDGPUISD::FP_CLASS:
     return performClassCombine(N, DCI);
+  case ISD::FCANONICALIZE:
+    return performFCanonicalizeCombine(N, DCI);
   }
   return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
 }

lib/Target/AMDGPU/SIISelLowering.h

@@ -55,6 +55,7 @@ class SITargetLowering final : public AMDGPUTargetLowering {
   SDValue performAndCombine(SDNode *N, DAGCombinerInfo &DCI) const;
   SDValue performOrCombine(SDNode *N, DAGCombinerInfo &DCI) const;
   SDValue performClassCombine(SDNode *N, DAGCombinerInfo &DCI) const;
+  SDValue performFCanonicalizeCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 
   SDValue performMinMaxCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 

lib/Target/AMDGPU/SIInstructions.td

@@ -3515,6 +3515,16 @@ def : Pat <
 >;
 }
 
+def : Pat<
+  (fcanonicalize f32:$src),
+  (V_MUL_F32_e64 0, CONST.FP32_ONE, 0, $src, 0, 0)
+>;
+
+def : Pat<
+  (fcanonicalize f64:$src),
+  (V_MUL_F64 0, CONST.FP64_ONE, 0, $src, 0, 0)
+>;
+
 //===----------------------------------------------------------------------===//
 // Fract Patterns
 //===----------------------------------------------------------------------===//

test/CodeGen/AMDGPU/fcanonicalize.ll

@@ -0,0 +1,320 @@
+; RUN: llc -march=amdgcn -verify-machineinstrs -mattr=-fp32-denormals,-fp64-denormals < %s | FileCheck -check-prefix=GCN -check-prefix=NODENORM %s
+; RUN: llc -march=amdgcn -verify-machineinstrs -mattr=+fp32-denormals,+fp64-denormals < %s | FileCheck -check-prefix=GCN -check-prefix=DENORM %s
+
+declare float @llvm.canonicalize.f32(float) #0
+declare double @llvm.canonicalize.f64(double) #0
+
+; GCN-LABEL: {{^}}v_test_canonicalize_var_f32:
+; GCN: v_mul_f32_e32 [[REG:v[0-9]+]], 1.0, {{v[0-9]+}}
+; GCN: buffer_store_dword [[REG]]
+define void @v_test_canonicalize_var_f32(float addrspace(1)* %out) #1 {
+  %val = load float, float addrspace(1)* %out
+  %canonicalized = call float @llvm.canonicalize.f32(float %val)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}s_test_canonicalize_var_f32:
+; GCN: v_mul_f32_e64 [[REG:v[0-9]+]], 1.0, {{s[0-9]+}}
+; GCN: buffer_store_dword [[REG]]
+define void @s_test_canonicalize_var_f32(float addrspace(1)* %out, float %val) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float %val)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_p0_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_p0_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float 0.0)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_n0_f32:
+; GCN: v_bfrev_b32_e32 [[REG:v[0-9]+]], 1{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_n0_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float -0.0)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_p1_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 1.0{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_p1_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float 1.0)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_n1_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], -1.0{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_n1_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float -1.0)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_literal_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x41800000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_literal_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float 16.0)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_denormal0_f32:
+; NODENORM: v_mov_b32_e32 [[REG:v[0-9]+]], 0{{$}}
+; DENORM: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fffff{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_denormal0_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 8388607 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_denormal1_f32:
+; NODENORM: v_mov_b32_e32 [[REG:v[0-9]+]], 0{{$}}
+; DENORM: v_mov_b32_e32 [[REG:v[0-9]+]], 0x807fffff{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_denormal1_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 2155872255 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_qnan_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float 0x7FF8000000000000)
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_value_neg1_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_qnan_value_neg1_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 -1 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_value_neg2_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_qnan_value_neg2_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 -2 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan0_value_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_snan0_value_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 2139095041 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan1_value_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_snan1_value_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 2143289343 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan2_value_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_snan2_value_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 4286578689 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan3_value_f32:
+; GCN: v_mov_b32_e32 [[REG:v[0-9]+]], 0x7fc00000{{$}}
+; GCN: buffer_store_dword [[REG]]
+define void @test_fold_canonicalize_snan3_value_f32(float addrspace(1)* %out) #1 {
+  %canonicalized = call float @llvm.canonicalize.f32(float bitcast (i32 4290772991 to float))
+  store float %canonicalized, float addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}v_test_canonicalize_var_f64:
+; GCN: v_mul_f64 [[REG:v\[[0-9]+:[0-9]+\]]], 1.0, {{v\[[0-9]+:[0-9]+\]}}
+; GCN: buffer_store_dwordx2 [[REG]]
+define void @v_test_canonicalize_var_f64(double addrspace(1)* %out) #1 {
+  %val = load double, double addrspace(1)* %out
+  %canonicalized = call double @llvm.canonicalize.f64(double %val)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}s_test_canonicalize_var_f64:
+; GCN: v_mul_f64 [[REG:v\[[0-9]+:[0-9]+\]]], 1.0, {{s\[[0-9]+:[0-9]+\]}}
+; GCN: buffer_store_dwordx2 [[REG]]
+define void @s_test_canonicalize_var_f64(double addrspace(1)* %out, double %val) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double %val)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_p0_f64:
+; GCN: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: v_mov_b32_e32 v[[HI:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_p0_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double 0.0)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_n0_f64:
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN-DAG: v_bfrev_b32_e32 v[[HI:[0-9]+]], 1{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_n0_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double -0.0)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_p1_f64:
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x3ff00000{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_p1_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double 1.0)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_n1_f64:
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0xbff00000{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_n1_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double -1.0)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_literal_f64:
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x40300000{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_literal_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double 16.0)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_denormal0_f64:
+; DENORM-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], -1{{$}}
+; DENORM-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0xfffff{{$}}
+
+; NODENORM: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; NODENORM: v_mov_b32_e32 v[[HI:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_denormal0_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 4503599627370495 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_denormal1_f64:
+; DENORM-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], -1{{$}}
+; DENORM-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x800fffff{{$}}
+
+; NODENORM: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; NODENORM: v_mov_b32_e32 v[[HI:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_denormal1_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 9227875636482146303 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_qnan_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double 0x7FF8000000000000)
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_value_neg1_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_qnan_value_neg1_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 -1 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_qnan_value_neg2_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_qnan_value_neg2_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 -2 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan0_value_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_snan0_value_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 9218868437227405313 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan1_value_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_snan1_value_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 9223372036854775807 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan2_value_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_snan2_value_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 18442240474082181121 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+; GCN-LABEL: {{^}}test_fold_canonicalize_snan3_value_f64:
+; GCN-DAG: v_mov_b32_e32 v[[HI:[0-9]+]], 0x7ff80000{{$}}
+; GCN-DAG: v_mov_b32_e32 v[[LO:[0-9]+]], 0{{$}}
+; GCN: buffer_store_dwordx2 v{{\[}}[[LO]]:[[HI]]{{\]}}
+define void @test_fold_canonicalize_snan3_value_f64(double addrspace(1)* %out) #1 {
+  %canonicalized = call double @llvm.canonicalize.f64(double bitcast (i64 18446744073709551615 to double))
+  store double %canonicalized, double addrspace(1)* %out
+  ret void
+}
+
+attributes #0 = { nounwind readnone }
+attributes #1 = { nounwind }