llvm · KungFuDonkey · Oct 25, 2025 · Oct 25, 2025
diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
@@ -5017,6 +5017,12 @@ def HLSLWaveActiveSum : LangBuiltin<"HLSL_LANG"> {
   let Prototype = "void (...)";
 }
 
+def HLSLWaveActiveProduct : LangBuiltin<"HLSL_LANG"> {
+  let Spellings = ["__builtin_hlsl_wave_active_product"];
+  let Attributes = [NoThrow, Const];
+  let Prototype = "void (...)";
+}
+
 def HLSLWaveGetLaneIndex : LangBuiltin<"HLSL_LANG"> {
   let Spellings = ["__builtin_hlsl_wave_get_lane_index"];
   let Attributes = [NoThrow, Const];

diff --git a/clang/lib/CodeGen/CGHLSLBuiltins.cpp b/clang/lib/CodeGen/CGHLSLBuiltins.cpp
@@ -196,6 +196,23 @@ static Intrinsic::ID getWaveActiveSumIntrinsic(llvm::Triple::ArchType Arch,
   }
 }
 
+// Return wave active product that corresponds to the QT scalar type
+static Intrinsic::ID getWaveActiveProductIntrinsic(llvm::Triple::ArchType Arch,
+                                                   CGHLSLRuntime &RT, QualType QT) {
+  switch (Arch) {
+  case llvm::Triple::spirv:
+    return Intrinsic::spv_wave_reduce_product;
+  case llvm::Triple::dxil: {
+    if (QT->isUnsignedIntegerType())
+      return Intrinsic::dx_wave_reduce_uproduct;
+    return Intrinsic::dx_wave_reduce_product;
+  }
+  default:
+    llvm_unreachable("Intrinsic WaveActiveProduct"
+                     " not supported by target architecture");
+  }
+}
+
 // Return wave active sum that corresponds to the QT scalar type
 static Intrinsic::ID getWaveActiveMaxIntrinsic(llvm::Triple::ArchType Arch,
                                                CGHLSLRuntime &RT, QualType QT) {
@@ -708,6 +725,17 @@ Value *CodeGenFunction::EmitHLSLBuiltinExpr(unsigned BuiltinID,
                                &CGM.getModule(), IID, {OpExpr->getType()}),
                            ArrayRef{OpExpr}, "hlsl.wave.active.sum");
   }
+  case Builtin::BI__builtin_hlsl_wave_active_product: {
+    // Due to the use of variadic arguments, explicitly retreive argument
+    Value *OpExpr = EmitScalarExpr(E->getArg(0));
+    Intrinsic::ID IID = getWaveActiveProductIntrinsic(
+        getTarget().getTriple().getArch(), CGM.getHLSLRuntime(),
+        E->getArg(0)->getType());
+
+    return EmitRuntimeCall(Intrinsic::getOrInsertDeclaration(
+                               &CGM.getModule(), IID, {OpExpr->getType()}),
+                           ArrayRef{OpExpr}, "hlsl.wave.active.product");
+  }
   case Builtin::BI__builtin_hlsl_wave_active_max: {
     // Due to the use of variadic arguments, explicitly retreive argument
     Value *OpExpr = EmitScalarExpr(E->getArg(0));

diff --git a/clang/lib/Headers/hlsl/hlsl_alias_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_alias_intrinsics.h
@@ -2696,6 +2696,130 @@ __attribute__((convergent)) double3 WaveActiveSum(double3);
 _HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_sum)
 __attribute__((convergent)) double4 WaveActiveSum(double4);
 
+//===----------------------------------------------------------------------===//
+// WaveActiveProduct builtins
+//===----------------------------------------------------------------------===//
+
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) half WaveActiveProduct(half);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) half2 WaveActiveProduct(half2);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) half3 WaveActiveProduct(half3);
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) half4 WaveActiveProduct(half4);
+
+#ifdef __HLSL_ENABLE_16_BIT
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int16_t WaveActiveProduct(int16_t);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int16_t2 WaveActiveProduct(int16_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int16_t3 WaveActiveProduct(int16_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int16_t4 WaveActiveProduct(int16_t4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint16_t WaveActiveProduct(uint16_t);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint16_t2 WaveActiveProduct(uint16_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint16_t3 WaveActiveProduct(uint16_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint16_t4 WaveActiveProduct(uint16_t4);
+#endif
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int WaveActiveProduct(int);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int2 WaveActiveProduct(int2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int3 WaveActiveProduct(int3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int4 WaveActiveProduct(int4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint WaveActiveProduct(uint);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint2 WaveActiveProduct(uint2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint3 WaveActiveProduct(uint3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint4 WaveActiveProduct(uint4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int64_t WaveActiveProduct(int64_t);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int64_t2 WaveActiveProduct(int64_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int64_t3 WaveActiveProduct(int64_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) int64_t4 WaveActiveProduct(int64_t4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint64_t WaveActiveProduct(uint64_t);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint64_t2 WaveActiveProduct(uint64_t2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint64_t3 WaveActiveProduct(uint64_t3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) uint64_t4 WaveActiveProduct(uint64_t4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) float WaveActiveProduct(float);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) float2 WaveActiveProduct(float2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) float3 WaveActiveProduct(float3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) float4 WaveActiveProduct(float4);
+
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) double WaveActiveProduct(double);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) double2 WaveActiveProduct(double2);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) double3 WaveActiveProduct(double3);
+_HLSL_AVAILABILITY(shadermodel, 6.0)
+_HLSL_BUILTIN_ALIAS(__builtin_hlsl_wave_active_product)
+__attribute__((convergent)) double4 WaveActiveProduct(double4);
+
+
 //===----------------------------------------------------------------------===//
 // sign builtins
 //===----------------------------------------------------------------------===//

diff --git a/clang/lib/Sema/SemaHLSL.cpp b/clang/lib/Sema/SemaHLSL.cpp
@@ -3197,7 +3197,8 @@ bool SemaHLSL::CheckBuiltinFunctionCall(unsigned BuiltinID, CallExpr *TheCall) {
     break;
   }
   case Builtin::BI__builtin_hlsl_wave_active_max:
-  case Builtin::BI__builtin_hlsl_wave_active_sum: {
+  case Builtin::BI__builtin_hlsl_wave_active_sum:
+  case Builtin::BI__builtin_hlsl_wave_active_product: {
     if (SemaRef.checkArgCount(TheCall, 1))
       return true;
 

diff --git a/clang/test/CodeGenHLSL/builtins/WaveActiveProduct.hlsl b/clang/test/CodeGenHLSL/builtins/WaveActiveProduct.hlsl
@@ -0,0 +1,45 @@
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -triple \
+// RUN:   dxil-pc-shadermodel6.3-compute %s -emit-llvm -disable-llvm-passes -o - | \
+// RUN:   FileCheck %s --check-prefixes=CHECK,CHECK-DXIL
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -triple \
+// RUN:   spirv-pc-vulkan-compute %s -emit-llvm -disable-llvm-passes -o - | \
+// RUN:   FileCheck %s --check-prefixes=CHECK,CHECK-SPIRV
+
+// Test basic lowering to runtime function call.
+
+// CHECK-LABEL: test_int
+int test_int(int expr) {
+  // CHECK-SPIRV:  %[[RET:.*]] = call spir_func [[TY:.*]] @llvm.spv.wave.reduce.product.i32([[TY]] %[[#]])
+  // CHECK-DXIL:  %[[RET:.*]] = call [[TY:.*]] @llvm.dx.wave.reduce.product.i32([[TY]] %[[#]])
+  // CHECK:  ret [[TY]] %[[RET]]
+  return WaveActiveProduct(expr);
+}
+
+// CHECK-DXIL: declare [[TY]] @llvm.dx.wave.reduce.product.i32([[TY]]) #[[#attr:]]
+// CHECK-SPIRV: declare [[TY]] @llvm.spv.wave.reduce.product.i32([[TY]]) #[[#attr:]]
+
+// CHECK-LABEL: test_uint64_t
+uint64_t test_uint64_t(uint64_t expr) {
+  // CHECK-SPIRV:  %[[RET:.*]] = call spir_func [[TY:.*]] @llvm.spv.wave.reduce.product.i64([[TY]] %[[#]])
+  // CHECK-DXIL:  %[[RET:.*]] = call [[TY:.*]] @llvm.dx.wave.reduce.uproduct.i64([[TY]] %[[#]])
+  // CHECK:  ret [[TY]] %[[RET]]
+  return WaveActiveProduct(expr);
+}
+
+// CHECK-DXIL: declare [[TY]] @llvm.dx.wave.reduce.uproduct.i64([[TY]]) #[[#attr:]]
+// CHECK-SPIRV: declare [[TY]] @llvm.spv.wave.reduce.product.i64([[TY]]) #[[#attr:]]
+
+// Test basic lowering to runtime function call with array and float value.
+
+// CHECK-LABEL: test_floatv4
+float4 test_floatv4(float4 expr) {
+  // CHECK-SPIRV:  %[[RET1:.*]] = call reassoc nnan ninf nsz arcp afn spir_func [[TY1:.*]] @llvm.spv.wave.reduce.product.v4f32([[TY1]] %[[#]]
+  // CHECK-DXIL:  %[[RET1:.*]] = call reassoc nnan ninf nsz arcp afn [[TY1:.*]] @llvm.dx.wave.reduce.product.v4f32([[TY1]] %[[#]])
+  // CHECK:  ret [[TY1]] %[[RET1]]
+  return WaveActiveProduct(expr);
+}
+
+// CHECK-DXIL: declare [[TY1]] @llvm.dx.wave.reduce.product.v4f32([[TY1]]) #[[#attr]]
+// CHECK-SPIRV: declare [[TY1]] @llvm.spv.wave.reduce.product.v4f32([[TY1]]) #[[#attr]]
+
+// CHECK: attributes #[[#attr]] = {{{.*}} convergent {{.*}}}
diff --git a/clang/test/SemaHLSL/BuiltIns/WaveActiveProduct-errors.hlsl b/clang/test/SemaHLSL/BuiltIns/WaveActiveProduct-errors.hlsl
@@ -0,0 +1,28 @@
+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -emit-llvm-only -disable-llvm-passes -verify
+
+int test_too_few_arg() {
+  return __builtin_hlsl_wave_active_product();
+  // expected-error@-1 {{too few arguments to function call, expected 1, have 0}}
+}
+
+float2 test_too_many_arg(float2 p0) {
+  return __builtin_hlsl_wave_active_product(p0, p0);
+  // expected-error@-1 {{too many arguments to function call, expected 1, have 2}}
+}
+
+bool test_expr_bool_type_check(bool p0) {
+  return __builtin_hlsl_wave_active_product(p0);
+  // expected-error@-1 {{invalid operand of type 'bool'}}
+}
+
+bool2 test_expr_bool_vec_type_check(bool2 p0) {
+  return __builtin_hlsl_wave_active_product(p0);
+  // expected-error@-1 {{invalid operand of type 'bool2' (aka 'vector<bool, 2>')}}
+}
+
+struct S { float f; };
+
+S test_expr_struct_type_check(S p0) {
+  return __builtin_hlsl_wave_active_product(p0);
+  // expected-error@-1 {{invalid operand of type 'S' where a scalar or vector is required}}
+}
diff --git a/llvm/include/llvm/IR/IntrinsicsDirectX.td b/llvm/include/llvm/IR/IntrinsicsDirectX.td
@@ -155,6 +155,8 @@ def int_dx_wave_reduce_max : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType
 def int_dx_wave_reduce_umax : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
 def int_dx_wave_reduce_sum : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
 def int_dx_wave_reduce_usum : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
+def int_dx_wave_reduce_product : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
+def int_dx_wave_reduce_uproduct : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
 def int_dx_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [], [IntrConvergent]>;
 def int_dx_wave_readlane : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>, llvm_i32_ty], [IntrConvergent, IntrNoMem]>;
 def int_dx_wave_get_lane_count

diff --git a/llvm/include/llvm/IR/IntrinsicsSPIRV.td b/llvm/include/llvm/IR/IntrinsicsSPIRV.td
@@ -123,6 +123,7 @@ def int_spv_rsqrt : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty]
   def int_spv_wave_reduce_umax : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
   def int_spv_wave_reduce_max : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
   def int_spv_wave_reduce_sum : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
+  def int_spv_wave_reduce_product : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>], [IntrConvergent, IntrNoMem]>;
   def int_spv_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [], [IntrConvergent]>;
   def int_spv_wave_readlane : DefaultAttrsIntrinsic<[llvm_any_ty], [LLVMMatchType<0>, llvm_i32_ty], [IntrConvergent, IntrNoMem]>;
   def int_spv_wave_get_lane_count
@@ -136,7 +137,7 @@ def int_spv_rsqrt : DefaultAttrsIntrinsic<[LLVMMatchType<0>], [llvm_anyfloat_ty]
   def int_spv_sclamp : DefaultAttrsIntrinsic<[llvm_anyint_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
   def int_spv_nclamp : DefaultAttrsIntrinsic<[llvm_anyfloat_ty], [LLVMMatchType<0>, LLVMMatchType<0>, LLVMMatchType<0>], [IntrNoMem]>;
 
-  // Create resource handle given the binding information. Returns a 
+  // Create resource handle given the binding information. Returns a
   // type appropriate for the kind of resource given the set id, binding id,
   // array size of the binding, as well as an index and an indicator
   // whether that index may be non-uniform.

diff --git a/llvm/lib/Target/DirectX/DXIL.td b/llvm/lib/Target/DirectX/DXIL.td
@@ -1048,6 +1048,16 @@ def WaveActiveOp : DXILOp<119, waveActiveOp> {
                    IntrinArgIndex<0>, IntrinArgI8<WaveOpKind_Sum>,
                    IntrinArgI8<SignedOpKind_Unsigned>
                  ]>,
+    IntrinSelect<int_dx_wave_reduce_product,
+                 [
+                   IntrinArgIndex<0>, IntrinArgI8<WaveOpKind_Product>,
+                   IntrinArgI8<SignedOpKind_Signed>
+                 ]>,
+    IntrinSelect<int_dx_wave_reduce_uproduct,
+                 [
+                   IntrinArgIndex<0>, IntrinArgI8<WaveOpKind_Product>,
+                   IntrinArgI8<SignedOpKind_Unsigned>
+                 ]>,
     IntrinSelect<int_dx_wave_reduce_max,
                  [
                    IntrinArgIndex<0>, IntrinArgI8<WaveOpKind_Max>,

diff --git a/llvm/lib/Target/DirectX/DXILShaderFlags.cpp b/llvm/lib/Target/DirectX/DXILShaderFlags.cpp
@@ -92,6 +92,8 @@ static bool checkWaveOps(Intrinsic::ID IID) {
   // Wave Active Op Variants
   case Intrinsic::dx_wave_reduce_sum:
   case Intrinsic::dx_wave_reduce_usum:
+  case Intrinsic::dx_wave_reduce_product:
+  case Intrinsic::dx_wave_reduce_uproduct:
   case Intrinsic::dx_wave_reduce_max:
   case Intrinsic::dx_wave_reduce_umax:
     return true;

diff --git a/llvm/lib/Target/DirectX/DirectXTargetTransformInfo.cpp b/llvm/lib/Target/DirectX/DirectXTargetTransformInfo.cpp
@@ -56,8 +56,10 @@ bool DirectXTTIImpl::isTargetIntrinsicTriviallyScalarizable(
   case Intrinsic::dx_wave_readlane:
   case Intrinsic::dx_wave_reduce_max:
   case Intrinsic::dx_wave_reduce_sum:
+  case Intrinsic::dx_wave_reduce_product:
   case Intrinsic::dx_wave_reduce_umax:
   case Intrinsic::dx_wave_reduce_usum:
+  case Intrinsic::dx_wave_reduce_uproduct:
   case Intrinsic::dx_imad:
   case Intrinsic::dx_umad:
     return true;

diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -225,6 +225,9 @@ class SPIRVInstructionSelector : public InstructionSelector {
   bool selectWaveReduceSum(Register ResVReg, const SPIRVType *ResType,
                            MachineInstr &I) const;
 
+  bool selectWaveReduceProduct(Register ResVReg, const SPIRVType *ResType,
+                           MachineInstr &I) const;
+
   bool selectConst(Register ResVReg, const SPIRVType *ResType,
                    MachineInstr &I) const;
 
@@ -2482,6 +2485,32 @@ bool SPIRVInstructionSelector::selectWaveReduceSum(Register ResVReg,
       .addUse(I.getOperand(2).getReg());
 }
 
+bool SPIRVInstructionSelector::selectWaveReduceProduct(Register ResVReg,
+                                                       const SPIRVType *ResType,
+                                                       MachineInstr &I) const {
+  assert(I.getNumOperands() == 3);
+  assert(I.getOperand(2).isReg());
+  MachineBasicBlock &BB = *I.getParent();
+  Register InputRegister = I.getOperand(2).getReg();
+  SPIRVType *InputType = GR.getSPIRVTypeForVReg(InputRegister);
+
+  if (!InputType)
+    report_fatal_error("Input Type could not be determined.");
+
+  SPIRVType *IntTy = GR.getOrCreateSPIRVIntegerType(32, I, TII);
+  // Retreive the operation to use based on input type
+  bool IsFloatTy = GR.isScalarOrVectorOfType(InputRegister, SPIRV::OpTypeFloat);
+  auto Opcode =
+      IsFloatTy ? SPIRV::OpGroupNonUniformFMul : SPIRV::OpGroupNonUniformIMul;
+  return BuildMI(BB, I, I.getDebugLoc(), TII.get(Opcode))
+      .addDef(ResVReg)
+      .addUse(GR.getSPIRVTypeID(ResType))
+      .addUse(GR.getOrCreateConstInt(SPIRV::Scope::Subgroup, I, IntTy, TII,
+                                     !STI.isShader()))
+      .addImm(SPIRV::GroupOperation::Reduce)
+      .addUse(I.getOperand(2).getReg());
+}
+
 bool SPIRVInstructionSelector::selectBitreverse(Register ResVReg,
                                                 const SPIRVType *ResType,
                                                 MachineInstr &I) const {
@@ -3433,6 +3462,8 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register ResVReg,
     return selectWaveReduceMax(ResVReg, ResType, I, /*IsUnsigned*/ false);
   case Intrinsic::spv_wave_reduce_sum:
     return selectWaveReduceSum(ResVReg, ResType, I);
+  case Intrinsic::spv_wave_reduce_product:
+    return selectWaveReduceProduct(ResVReg, ResType, I);
   case Intrinsic::spv_wave_readlane:
     return selectWaveOpInst(ResVReg, ResType, I,
                             SPIRV::OpGroupNonUniformShuffle);