src/Pipeline/SpirvShaderGroup.cpp - SwiftShader.git - Git at Google

 // Copyright 2019 The SwiftShader Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 #include "SpirvShader.hpp"

 #include <spirv/unified1/spirv.hpp>

 namespace sw {

 struct SpirvShader::Impl::Group
 {
 	// Template function to perform a binary operation.
 	// |TYPE| should be the type of the binary operation (as a SIMD::<ScalarType>).
 	// |I| should be a type suitable to initialize the identity value.
 	// |APPLY| should be a callable object that takes two RValue<TYPE> parameters
 	// and returns a new RValue<TYPE> corresponding to the operation's result.
 	template<typename TYPE, typename I, typename APPLY>
 	static void BinaryOperation(
 	    const SpirvShader *shader,
 	    const SpirvShader::InsnIterator &insn,
 	    const SpirvShader::EmitState *state,
 	    Intermediate &dst,
 	    const I identityValue,
 	    APPLY &&apply)
 	{
 		SpirvShader::Operand value(shader, state, insn.word(5));
 		auto &type = shader->getType(SpirvShader::Type::ID(insn.word(1)));
 		for(auto i = 0u; i < type.componentCount; i++)
 		{
 			auto mask = As<SIMD::UInt>(state->activeLaneMask());  // Considers helper invocations active. See b/151137030
 			auto identity = TYPE(identityValue);
 			SIMD::UInt v_uint = (value.UInt(i) & mask) | (As<SIMD::UInt>(identity) & ~mask);
 			TYPE v = As<TYPE>(v_uint);
 			switch(spv::GroupOperation(insn.word(4)))
 			{
 			case spv::GroupOperationReduce:
 				{
 					// NOTE: floating-point add and multiply are not really commutative so
 					//       ensure that all values in the final lanes are identical
 					TYPE v2 = apply(v.xxzz, v.yyww);    // [xy]   [xy]   [zw]   [zw]
 					TYPE v3 = apply(v2.xxxx, v2.zzzz);  // [xyzw] [xyzw] [xyzw] [xyzw]
 					dst.move(i, v3);
 				}
 				break;
 			case spv::GroupOperationInclusiveScan:
 				{
 					TYPE v2 = apply(v, Shuffle(v, identity, 0x4012) /* [id, v.y, v.z, v.w] */);      // [x] [xy] [yz]  [zw]
 					TYPE v3 = apply(v2, Shuffle(v2, identity, 0x4401) /* [id,  id, v2.x, v2.y] */);  // [x] [xy] [xyz] [xyzw]
 					dst.move(i, v3);
 				}
 				break;
 			case spv::GroupOperationExclusiveScan:
 				{
 					TYPE v2 = apply(v, Shuffle(v, identity, 0x4012) /* [id, v.y, v.z, v.w] */);      // [x] [xy] [yz]  [zw]
 					TYPE v3 = apply(v2, Shuffle(v2, identity, 0x4401) /* [id,  id, v2.x, v2.y] */);  // [x] [xy] [xyz] [xyzw]
 					auto v4 = Shuffle(v3, identity, 0x4012 /* [id, v3.x, v3.y, v3.z] */);            // [i] [x]  [xy]  [xyz]
 					dst.move(i, v4);
 				}
 				break;
 			default:
 				UNSUPPORTED("EmitGroupNonUniform op: %s Group operation: %d",
 				            SpirvShader::OpcodeName(type.opcode()), insn.word(4));
 			}
 		}
 	}
 };

 SpirvShader::EmitResult SpirvShader::EmitGroupNonUniform(InsnIterator insn, EmitState *state) const
 {
 	static_assert(SIMD::Width == 4, "EmitGroupNonUniform makes many assumptions that the SIMD vector width is 4");

 	auto &type = getType(Type::ID(insn.word(1)));
 	Object::ID resultId = insn.word(2);
 	auto scope = spv::Scope(GetConstScalarInt(insn.word(3)));
 	ASSERT_MSG(scope == spv::ScopeSubgroup, "Scope for Non Uniform Group Operations must be Subgroup for Vulkan 1.1");

 	auto &dst = state->createIntermediate(resultId, type.componentCount);

 	switch(insn.opcode())
 	{
 	case spv::OpGroupNonUniformElect:
 		{
 			// Result is true only in the active invocation with the lowest id
 			// in the group, otherwise result is false.
 			SIMD::Int active = state->activeLaneMask();  // Considers helper invocations active. See b/151137030
 			// TODO: Would be nice if we could write this as:
 			//   elect = active & ~(active.Oxyz | active.OOxy | active.OOOx)
 			auto v0111 = SIMD::Int(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
 			auto elect = active & ~(v0111 & (active.xxyz | active.xxxy | active.xxxx));
 			dst.move(0, elect);
 		}
 		break;

 	case spv::OpGroupNonUniformAll:
 		{
 			Operand predicate(this, state, insn.word(4));
 			dst.move(0, AndAll(predicate.UInt(0) | ~As<SIMD::UInt>(state->activeLaneMask())));  // Considers helper invocations active. See b/151137030
 		}
 		break;

 	case spv::OpGroupNonUniformAny:
 		{
 			Operand predicate(this, state, insn.word(4));
 			dst.move(0, OrAll(predicate.UInt(0) & As<SIMD::UInt>(state->activeLaneMask())));  // Considers helper invocations active. See b/151137030
 		}
 		break;

 	case spv::OpGroupNonUniformAllEqual:
 		{
 			Operand value(this, state, insn.word(4));
 			auto res = SIMD::UInt(0xffffffff);
 			SIMD::UInt active = As<SIMD::UInt>(state->activeLaneMask());  // Considers helper invocations active. See b/151137030
 			SIMD::UInt inactive = ~active;
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				SIMD::UInt v = value.UInt(i) & active;
 				SIMD::UInt filled = v;
 				for(int j = 0; j < SIMD::Width - 1; j++)
 				{
 					filled |= filled.yzwx & inactive;  // Populate inactive 'holes' with a live value
 				}
 				res &= AndAll(CmpEQ(filled.xyzw, filled.yzwx));
 			}
 			dst.move(0, res);
 		}
 		break;

 	case spv::OpGroupNonUniformBroadcast:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			auto idId = Object::ID(insn.word(5));
 			Operand value(this, state, valueId);

 			// Decide between the fast path for constants and the slow path for
 			// intermediates.
 			if(getObject(idId).kind == SpirvShader::Object::Kind::Constant)
 			{
 				auto id = SIMD::Int(GetConstScalarInt(insn.word(5)));
 				auto mask = CmpEQ(id, SIMD::Int(0, 1, 2, 3));
 				for(auto i = 0u; i < type.componentCount; i++)
 				{
 					dst.move(i, OrAll(value.Int(i) & mask));
 				}
 			}
 			else
 			{
 				Operand id(this, state, idId);

 				SIMD::UInt active = As<SIMD::UInt>(state->activeLaneMask());  // Considers helper invocations active. See b/151137030
 				SIMD::UInt inactive = ~active;
 				SIMD::UInt filled = id.UInt(0) & active;

 				for(int j = 0; j < SIMD::Width - 1; j++)
 				{
 					filled |= filled.yzwx & inactive;  // Populate inactive 'holes' with a live value
 				}

 				auto mask = CmpEQ(filled, SIMD::UInt(0, 1, 2, 3));

 				for(uint32_t i = 0u; i < type.componentCount; i++)
 				{
 					dst.move(i, OrAll(value.UInt(i) & mask));
 				}
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformBroadcastFirst:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			Operand value(this, state, valueId);
 			// Result is true only in the active invocation with the lowest id
 			// in the group, otherwise result is false.
 			SIMD::Int active = state->activeLaneMask();  // Considers helper invocations active. See b/151137030
 			// TODO: Would be nice if we could write this as:
 			//   elect = active & ~(active.Oxyz | active.OOxy | active.OOOx)
 			auto v0111 = SIMD::Int(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
 			auto elect = active & ~(v0111 & (active.xxyz | active.xxxy | active.xxxx));
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				dst.move(i, OrAll(value.Int(i) & elect));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformBallot:
 		{
 			ASSERT(type.componentCount == 4);
 			Operand predicate(this, state, insn.word(4));
 			dst.move(0, SIMD::Int(SignMask(state->activeLaneMask() & predicate.Int(0))));  // Considers helper invocations active. See b/151137030
 			dst.move(1, SIMD::Int(0));
 			dst.move(2, SIMD::Int(0));
 			dst.move(3, SIMD::Int(0));
 		}
 		break;

 	case spv::OpGroupNonUniformInverseBallot:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			ASSERT(type.componentCount == 1);
 			ASSERT(getObjectType(valueId).componentCount == 4);
 			Operand value(this, state, valueId);
 			auto bit = (value.Int(0) >> SIMD::Int(0, 1, 2, 3)) & SIMD::Int(1);
 			dst.move(0, -bit);
 		}
 		break;

 	case spv::OpGroupNonUniformBallotBitExtract:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			auto indexId = Object::ID(insn.word(5));
 			ASSERT(type.componentCount == 1);
 			ASSERT(getObjectType(valueId).componentCount == 4);
 			ASSERT(getObjectType(indexId).componentCount == 1);
 			Operand value(this, state, valueId);
 			Operand index(this, state, indexId);
 			auto vecIdx = index.Int(0) / SIMD::Int(32);
 			auto bitIdx = index.Int(0) & SIMD::Int(31);
 			auto bits = (value.Int(0) & CmpEQ(vecIdx, SIMD::Int(0))) |
 			            (value.Int(1) & CmpEQ(vecIdx, SIMD::Int(1))) |
 			            (value.Int(2) & CmpEQ(vecIdx, SIMD::Int(2))) |
 			            (value.Int(3) & CmpEQ(vecIdx, SIMD::Int(3)));
 			dst.move(0, -((bits >> bitIdx) & SIMD::Int(1)));
 		}
 		break;

 	case spv::OpGroupNonUniformBallotBitCount:
 		{
 			auto operation = spv::GroupOperation(insn.word(4));
 			auto valueId = Object::ID(insn.word(5));
 			ASSERT(type.componentCount == 1);
 			ASSERT(getObjectType(valueId).componentCount == 4);
 			Operand value(this, state, valueId);
 			switch(operation)
 			{
 			case spv::GroupOperationReduce:
 				dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(15)));
 				break;
 			case spv::GroupOperationInclusiveScan:
 				dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(1, 3, 7, 15)));
 				break;
 			case spv::GroupOperationExclusiveScan:
 				dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(0, 1, 3, 7)));
 				break;
 			default:
 				UNSUPPORTED("GroupOperation %d", int(operation));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformBallotFindLSB:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			ASSERT(type.componentCount == 1);
 			ASSERT(getObjectType(valueId).componentCount == 4);
 			Operand value(this, state, valueId);
 			dst.move(0, Cttz(value.UInt(0) & SIMD::UInt(15), true));
 		}
 		break;

 	case spv::OpGroupNonUniformBallotFindMSB:
 		{
 			auto valueId = Object::ID(insn.word(4));
 			ASSERT(type.componentCount == 1);
 			ASSERT(getObjectType(valueId).componentCount == 4);
 			Operand value(this, state, valueId);
 			dst.move(0, SIMD::UInt(31) - Ctlz(value.UInt(0) & SIMD::UInt(15), false));
 		}
 		break;

 	case spv::OpGroupNonUniformShuffle:
 		{
 			Operand value(this, state, insn.word(4));
 			Operand id(this, state, insn.word(5));
 			auto x = CmpEQ(SIMD::Int(0), id.Int(0));
 			auto y = CmpEQ(SIMD::Int(1), id.Int(0));
 			auto z = CmpEQ(SIMD::Int(2), id.Int(0));
 			auto w = CmpEQ(SIMD::Int(3), id.Int(0));
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				SIMD::Int v = value.Int(i);
 				dst.move(i, (x & v.xxxx) | (y & v.yyyy) | (z & v.zzzz) | (w & v.wwww));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformShuffleXor:
 		{
 			Operand value(this, state, insn.word(4));
 			Operand mask(this, state, insn.word(5));
 			auto x = CmpEQ(SIMD::Int(0), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
 			auto y = CmpEQ(SIMD::Int(1), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
 			auto z = CmpEQ(SIMD::Int(2), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
 			auto w = CmpEQ(SIMD::Int(3), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				SIMD::Int v = value.Int(i);
 				dst.move(i, (x & v.xxxx) | (y & v.yyyy) | (z & v.zzzz) | (w & v.wwww));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformShuffleUp:
 		{
 			Operand value(this, state, insn.word(4));
 			Operand delta(this, state, insn.word(5));
 			auto d0 = CmpEQ(SIMD::Int(0), delta.Int(0));
 			auto d1 = CmpEQ(SIMD::Int(1), delta.Int(0));
 			auto d2 = CmpEQ(SIMD::Int(2), delta.Int(0));
 			auto d3 = CmpEQ(SIMD::Int(3), delta.Int(0));
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				SIMD::Int v = value.Int(i);
 				dst.move(i, (d0 & v.xyzw) | (d1 & v.xxyz) | (d2 & v.xxxy) | (d3 & v.xxxx));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformShuffleDown:
 		{
 			Operand value(this, state, insn.word(4));
 			Operand delta(this, state, insn.word(5));
 			auto d0 = CmpEQ(SIMD::Int(0), delta.Int(0));
 			auto d1 = CmpEQ(SIMD::Int(1), delta.Int(0));
 			auto d2 = CmpEQ(SIMD::Int(2), delta.Int(0));
 			auto d3 = CmpEQ(SIMD::Int(3), delta.Int(0));
 			for(auto i = 0u; i < type.componentCount; i++)
 			{
 				SIMD::Int v = value.Int(i);
 				dst.move(i, (d0 & v.xyzw) | (d1 & v.yzww) | (d2 & v.zwww) | (d3 & v.wwww));
 			}
 		}
 		break;

 	case spv::OpGroupNonUniformIAdd:
 		Impl::Group::BinaryOperation<SIMD::Int>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) { return a + b; });
 		break;

 	case spv::OpGroupNonUniformFAdd:
 		Impl::Group::BinaryOperation<SIMD::Float>(
 		    this, insn, state, dst, 0.0f,
 		    [](auto a, auto b) { return a + b; });
 		break;

 	case spv::OpGroupNonUniformIMul:
 		Impl::Group::BinaryOperation<SIMD::Int>(
 		    this, insn, state, dst, 1,
 		    [](auto a, auto b) { return a * b; });
 		break;

 	case spv::OpGroupNonUniformFMul:
 		Impl::Group::BinaryOperation<SIMD::Float>(
 		    this, insn, state, dst, 1.0f,
 		    [](auto a, auto b) { return a * b; });
 		break;

 	case spv::OpGroupNonUniformBitwiseAnd:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, ~0u,
 		    [](auto a, auto b) { return a & b; });
 		break;

 	case spv::OpGroupNonUniformBitwiseOr:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) { return a | b; });
 		break;

 	case spv::OpGroupNonUniformBitwiseXor:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) { return a ^ b; });
 		break;

 	case spv::OpGroupNonUniformSMin:
 		Impl::Group::BinaryOperation<SIMD::Int>(
 		    this, insn, state, dst, INT32_MAX,
 		    [](auto a, auto b) { return Min(a, b); });
 		break;

 	case spv::OpGroupNonUniformUMin:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, ~0u,
 		    [](auto a, auto b) { return Min(a, b); });
 		break;

 	case spv::OpGroupNonUniformFMin:
 		Impl::Group::BinaryOperation<SIMD::Float>(
 		    this, insn, state, dst, SIMD::Float::infinity(),
 		    [](auto a, auto b) { return NMin(a, b); });
 		break;

 	case spv::OpGroupNonUniformSMax:
 		Impl::Group::BinaryOperation<SIMD::Int>(
 		    this, insn, state, dst, INT32_MIN,
 		    [](auto a, auto b) { return Max(a, b); });
 		break;

 	case spv::OpGroupNonUniformUMax:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) { return Max(a, b); });
 		break;

 	case spv::OpGroupNonUniformFMax:
 		Impl::Group::BinaryOperation<SIMD::Float>(
 		    this, insn, state, dst, -SIMD::Float::infinity(),
 		    [](auto a, auto b) { return NMax(a, b); });
 		break;

 	case spv::OpGroupNonUniformLogicalAnd:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, ~0u,
 		    [](auto a, auto b) {
 			    SIMD::UInt zero = SIMD::UInt(0);
 			    return CmpNEQ(a, zero) & CmpNEQ(b, zero);
 		    });
 		break;

 	case spv::OpGroupNonUniformLogicalOr:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) {
 			    SIMD::UInt zero = SIMD::UInt(0);
 			    return CmpNEQ(a, zero) | CmpNEQ(b, zero);
 		    });
 		break;

 	case spv::OpGroupNonUniformLogicalXor:
 		Impl::Group::BinaryOperation<SIMD::UInt>(
 		    this, insn, state, dst, 0,
 		    [](auto a, auto b) {
 			    SIMD::UInt zero = SIMD::UInt(0);
 			    return CmpNEQ(a, zero) ^ CmpNEQ(b, zero);
 		    });
 		break;

 	default:
 		UNSUPPORTED("EmitGroupNonUniform op: %s", OpcodeName(type.opcode()));
 	}
 	return EmitResult::Continue;
 }

 }  // namespace sw
	// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	#include "SpirvShader.hpp"

	#include <spirv/unified1/spirv.hpp>

	namespace sw {

	struct SpirvShader::Impl::Group
	{
	// Template function to perform a binary operation.
	// \|TYPE\| should be the type of the binary operation (as a SIMD::<ScalarType>).
	// \|I\| should be a type suitable to initialize the identity value.
	// \|APPLY\| should be a callable object that takes two RValue<TYPE> parameters
	// and returns a new RValue<TYPE> corresponding to the operation's result.
	template<typename TYPE, typename I, typename APPLY>
	static void BinaryOperation(
	const SpirvShader *shader,
	const SpirvShader::InsnIterator &insn,
	const SpirvShader::EmitState *state,
	Intermediate &dst,
	const I identityValue,
	APPLY &&apply)
	{
	SpirvShader::Operand value(shader, state, insn.word(5));
	auto &type = shader->getType(SpirvShader::Type::ID(insn.word(1)));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	auto mask = As<SIMD::UInt>(state->activeLaneMask()); // Considers helper invocations active. See b/151137030
	auto identity = TYPE(identityValue);
	SIMD::UInt v_uint = (value.UInt(i) & mask) \| (As<SIMD::UInt>(identity) & ~mask);
	TYPE v = As<TYPE>(v_uint);
	switch(spv::GroupOperation(insn.word(4)))
	{
	case spv::GroupOperationReduce:
	{
	// NOTE: floating-point add and multiply are not really commutative so
	// ensure that all values in the final lanes are identical
	TYPE v2 = apply(v.xxzz, v.yyww); // [xy] [xy] [zw] [zw]
	TYPE v3 = apply(v2.xxxx, v2.zzzz); // [xyzw] [xyzw] [xyzw] [xyzw]
	dst.move(i, v3);
	}
	break;
	case spv::GroupOperationInclusiveScan:
	{
	TYPE v2 = apply(v, Shuffle(v, identity, 0x4012) /* [id, v.y, v.z, v.w] */); // [x] [xy] [yz] [zw]
	TYPE v3 = apply(v2, Shuffle(v2, identity, 0x4401) /* [id, id, v2.x, v2.y] */); // [x] [xy] [xyz] [xyzw]
	dst.move(i, v3);
	}
	break;
	case spv::GroupOperationExclusiveScan:
	{
	TYPE v2 = apply(v, Shuffle(v, identity, 0x4012) /* [id, v.y, v.z, v.w] */); // [x] [xy] [yz] [zw]
	TYPE v3 = apply(v2, Shuffle(v2, identity, 0x4401) /* [id, id, v2.x, v2.y] */); // [x] [xy] [xyz] [xyzw]
	auto v4 = Shuffle(v3, identity, 0x4012 /* [id, v3.x, v3.y, v3.z] */); // [i] [x] [xy] [xyz]
	dst.move(i, v4);
	}
	break;
	default:
	UNSUPPORTED("EmitGroupNonUniform op: %s Group operation: %d",
	SpirvShader::OpcodeName(type.opcode()), insn.word(4));
	}
	}
	}
	};

	SpirvShader::EmitResult SpirvShader::EmitGroupNonUniform(InsnIterator insn, EmitState *state) const
	{
	static_assert(SIMD::Width == 4, "EmitGroupNonUniform makes many assumptions that the SIMD vector width is 4");

	auto &type = getType(Type::ID(insn.word(1)));
	Object::ID resultId = insn.word(2);
	auto scope = spv::Scope(GetConstScalarInt(insn.word(3)));
	ASSERT_MSG(scope == spv::ScopeSubgroup, "Scope for Non Uniform Group Operations must be Subgroup for Vulkan 1.1");

	auto &dst = state->createIntermediate(resultId, type.componentCount);

	switch(insn.opcode())
	{
	case spv::OpGroupNonUniformElect:
	{
	// Result is true only in the active invocation with the lowest id
	// in the group, otherwise result is false.
	SIMD::Int active = state->activeLaneMask(); // Considers helper invocations active. See b/151137030
	// TODO: Would be nice if we could write this as:
	// elect = active & ~(active.Oxyz \| active.OOxy \| active.OOOx)
	auto v0111 = SIMD::Int(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
	auto elect = active & ~(v0111 & (active.xxyz \| active.xxxy \| active.xxxx));
	dst.move(0, elect);
	}
	break;

	case spv::OpGroupNonUniformAll:
	{
	Operand predicate(this, state, insn.word(4));
	dst.move(0, AndAll(predicate.UInt(0) \| ~As<SIMD::UInt>(state->activeLaneMask()))); // Considers helper invocations active. See b/151137030
	}
	break;

	case spv::OpGroupNonUniformAny:
	{
	Operand predicate(this, state, insn.word(4));
	dst.move(0, OrAll(predicate.UInt(0) & As<SIMD::UInt>(state->activeLaneMask()))); // Considers helper invocations active. See b/151137030
	}
	break;

	case spv::OpGroupNonUniformAllEqual:
	{
	Operand value(this, state, insn.word(4));
	auto res = SIMD::UInt(0xffffffff);
	SIMD::UInt active = As<SIMD::UInt>(state->activeLaneMask()); // Considers helper invocations active. See b/151137030
	SIMD::UInt inactive = ~active;
	for(auto i = 0u; i < type.componentCount; i++)
	{
	SIMD::UInt v = value.UInt(i) & active;
	SIMD::UInt filled = v;
	for(int j = 0; j < SIMD::Width - 1; j++)
	{
	filled \|= filled.yzwx & inactive; // Populate inactive 'holes' with a live value
	}
	res &= AndAll(CmpEQ(filled.xyzw, filled.yzwx));
	}
	dst.move(0, res);
	}
	break;

	case spv::OpGroupNonUniformBroadcast:
	{
	auto valueId = Object::ID(insn.word(4));
	auto idId = Object::ID(insn.word(5));
	Operand value(this, state, valueId);

	// Decide between the fast path for constants and the slow path for
	// intermediates.
	if(getObject(idId).kind == SpirvShader::Object::Kind::Constant)
	{
	auto id = SIMD::Int(GetConstScalarInt(insn.word(5)));
	auto mask = CmpEQ(id, SIMD::Int(0, 1, 2, 3));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	dst.move(i, OrAll(value.Int(i) & mask));
	}
	}
	else
	{
	Operand id(this, state, idId);

	SIMD::UInt active = As<SIMD::UInt>(state->activeLaneMask()); // Considers helper invocations active. See b/151137030
	SIMD::UInt inactive = ~active;
	SIMD::UInt filled = id.UInt(0) & active;

	for(int j = 0; j < SIMD::Width - 1; j++)
	{
	filled \|= filled.yzwx & inactive; // Populate inactive 'holes' with a live value
	}

	auto mask = CmpEQ(filled, SIMD::UInt(0, 1, 2, 3));

	for(uint32_t i = 0u; i < type.componentCount; i++)
	{
	dst.move(i, OrAll(value.UInt(i) & mask));
	}
	}
	}
	break;

	case spv::OpGroupNonUniformBroadcastFirst:
	{
	auto valueId = Object::ID(insn.word(4));
	Operand value(this, state, valueId);
	// Result is true only in the active invocation with the lowest id
	// in the group, otherwise result is false.
	SIMD::Int active = state->activeLaneMask(); // Considers helper invocations active. See b/151137030
	// TODO: Would be nice if we could write this as:
	// elect = active & ~(active.Oxyz \| active.OOxy \| active.OOOx)
	auto v0111 = SIMD::Int(0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF);
	auto elect = active & ~(v0111 & (active.xxyz \| active.xxxy \| active.xxxx));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	dst.move(i, OrAll(value.Int(i) & elect));
	}
	}
	break;

	case spv::OpGroupNonUniformBallot:
	{
	ASSERT(type.componentCount == 4);
	Operand predicate(this, state, insn.word(4));
	dst.move(0, SIMD::Int(SignMask(state->activeLaneMask() & predicate.Int(0)))); // Considers helper invocations active. See b/151137030
	dst.move(1, SIMD::Int(0));
	dst.move(2, SIMD::Int(0));
	dst.move(3, SIMD::Int(0));
	}
	break;

	case spv::OpGroupNonUniformInverseBallot:
	{
	auto valueId = Object::ID(insn.word(4));
	ASSERT(type.componentCount == 1);
	ASSERT(getObjectType(valueId).componentCount == 4);
	Operand value(this, state, valueId);
	auto bit = (value.Int(0) >> SIMD::Int(0, 1, 2, 3)) & SIMD::Int(1);
	dst.move(0, -bit);
	}
	break;

	case spv::OpGroupNonUniformBallotBitExtract:
	{
	auto valueId = Object::ID(insn.word(4));
	auto indexId = Object::ID(insn.word(5));
	ASSERT(type.componentCount == 1);
	ASSERT(getObjectType(valueId).componentCount == 4);
	ASSERT(getObjectType(indexId).componentCount == 1);
	Operand value(this, state, valueId);
	Operand index(this, state, indexId);
	auto vecIdx = index.Int(0) / SIMD::Int(32);
	auto bitIdx = index.Int(0) & SIMD::Int(31);
	auto bits = (value.Int(0) & CmpEQ(vecIdx, SIMD::Int(0))) \|
	(value.Int(1) & CmpEQ(vecIdx, SIMD::Int(1))) \|
	(value.Int(2) & CmpEQ(vecIdx, SIMD::Int(2))) \|
	(value.Int(3) & CmpEQ(vecIdx, SIMD::Int(3)));
	dst.move(0, -((bits >> bitIdx) & SIMD::Int(1)));
	}
	break;

	case spv::OpGroupNonUniformBallotBitCount:
	{
	auto operation = spv::GroupOperation(insn.word(4));
	auto valueId = Object::ID(insn.word(5));
	ASSERT(type.componentCount == 1);
	ASSERT(getObjectType(valueId).componentCount == 4);
	Operand value(this, state, valueId);
	switch(operation)
	{
	case spv::GroupOperationReduce:
	dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(15)));
	break;
	case spv::GroupOperationInclusiveScan:
	dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(1, 3, 7, 15)));
	break;
	case spv::GroupOperationExclusiveScan:
	dst.move(0, CountBits(value.UInt(0) & SIMD::UInt(0, 1, 3, 7)));
	break;
	default:
	UNSUPPORTED("GroupOperation %d", int(operation));
	}
	}
	break;

	case spv::OpGroupNonUniformBallotFindLSB:
	{
	auto valueId = Object::ID(insn.word(4));
	ASSERT(type.componentCount == 1);
	ASSERT(getObjectType(valueId).componentCount == 4);
	Operand value(this, state, valueId);
	dst.move(0, Cttz(value.UInt(0) & SIMD::UInt(15), true));
	}
	break;

	case spv::OpGroupNonUniformBallotFindMSB:
	{
	auto valueId = Object::ID(insn.word(4));
	ASSERT(type.componentCount == 1);
	ASSERT(getObjectType(valueId).componentCount == 4);
	Operand value(this, state, valueId);
	dst.move(0, SIMD::UInt(31) - Ctlz(value.UInt(0) & SIMD::UInt(15), false));
	}
	break;

	case spv::OpGroupNonUniformShuffle:
	{
	Operand value(this, state, insn.word(4));
	Operand id(this, state, insn.word(5));
	auto x = CmpEQ(SIMD::Int(0), id.Int(0));
	auto y = CmpEQ(SIMD::Int(1), id.Int(0));
	auto z = CmpEQ(SIMD::Int(2), id.Int(0));
	auto w = CmpEQ(SIMD::Int(3), id.Int(0));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	SIMD::Int v = value.Int(i);
	dst.move(i, (x & v.xxxx) \| (y & v.yyyy) \| (z & v.zzzz) \| (w & v.wwww));
	}
	}
	break;

	case spv::OpGroupNonUniformShuffleXor:
	{
	Operand value(this, state, insn.word(4));
	Operand mask(this, state, insn.word(5));
	auto x = CmpEQ(SIMD::Int(0), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
	auto y = CmpEQ(SIMD::Int(1), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
	auto z = CmpEQ(SIMD::Int(2), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
	auto w = CmpEQ(SIMD::Int(3), SIMD::Int(0, 1, 2, 3) ^ mask.Int(0));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	SIMD::Int v = value.Int(i);
	dst.move(i, (x & v.xxxx) \| (y & v.yyyy) \| (z & v.zzzz) \| (w & v.wwww));
	}
	}
	break;

	case spv::OpGroupNonUniformShuffleUp:
	{
	Operand value(this, state, insn.word(4));
	Operand delta(this, state, insn.word(5));
	auto d0 = CmpEQ(SIMD::Int(0), delta.Int(0));
	auto d1 = CmpEQ(SIMD::Int(1), delta.Int(0));
	auto d2 = CmpEQ(SIMD::Int(2), delta.Int(0));
	auto d3 = CmpEQ(SIMD::Int(3), delta.Int(0));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	SIMD::Int v = value.Int(i);
	dst.move(i, (d0 & v.xyzw) \| (d1 & v.xxyz) \| (d2 & v.xxxy) \| (d3 & v.xxxx));
	}
	}
	break;

	case spv::OpGroupNonUniformShuffleDown:
	{
	Operand value(this, state, insn.word(4));
	Operand delta(this, state, insn.word(5));
	auto d0 = CmpEQ(SIMD::Int(0), delta.Int(0));
	auto d1 = CmpEQ(SIMD::Int(1), delta.Int(0));
	auto d2 = CmpEQ(SIMD::Int(2), delta.Int(0));
	auto d3 = CmpEQ(SIMD::Int(3), delta.Int(0));
	for(auto i = 0u; i < type.componentCount; i++)
	{
	SIMD::Int v = value.Int(i);
	dst.move(i, (d0 & v.xyzw) \| (d1 & v.yzww) \| (d2 & v.zwww) \| (d3 & v.wwww));
	}
	}
	break;

	case spv::OpGroupNonUniformIAdd:
	Impl::Group::BinaryOperation<SIMD::Int>(
	this, insn, state, dst, 0,
	[](auto a, auto b) { return a + b; });
	break;

	case spv::OpGroupNonUniformFAdd:
	Impl::Group::BinaryOperation<SIMD::Float>(
	this, insn, state, dst, 0.0f,
	[](auto a, auto b) { return a + b; });
	break;

	case spv::OpGroupNonUniformIMul:
	Impl::Group::BinaryOperation<SIMD::Int>(
	this, insn, state, dst, 1,
	[](auto a, auto b) { return a * b; });
	break;

	case spv::OpGroupNonUniformFMul:
	Impl::Group::BinaryOperation<SIMD::Float>(
	this, insn, state, dst, 1.0f,
	[](auto a, auto b) { return a * b; });
	break;

	case spv::OpGroupNonUniformBitwiseAnd:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, ~0u,
	[](auto a, auto b) { return a & b; });
	break;

	case spv::OpGroupNonUniformBitwiseOr:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, 0,
	[](auto a, auto b) { return a \| b; });
	break;

	case spv::OpGroupNonUniformBitwiseXor:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, 0,
	[](auto a, auto b) { return a ^ b; });
	break;

	case spv::OpGroupNonUniformSMin:
	Impl::Group::BinaryOperation<SIMD::Int>(
	this, insn, state, dst, INT32_MAX,
	[](auto a, auto b) { return Min(a, b); });
	break;

	case spv::OpGroupNonUniformUMin:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, ~0u,
	[](auto a, auto b) { return Min(a, b); });
	break;

	case spv::OpGroupNonUniformFMin:
	Impl::Group::BinaryOperation<SIMD::Float>(
	this, insn, state, dst, SIMD::Float::infinity(),
	[](auto a, auto b) { return NMin(a, b); });
	break;

	case spv::OpGroupNonUniformSMax:
	Impl::Group::BinaryOperation<SIMD::Int>(
	this, insn, state, dst, INT32_MIN,
	[](auto a, auto b) { return Max(a, b); });
	break;

	case spv::OpGroupNonUniformUMax:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, 0,
	[](auto a, auto b) { return Max(a, b); });
	break;

	case spv::OpGroupNonUniformFMax:
	Impl::Group::BinaryOperation<SIMD::Float>(
	this, insn, state, dst, -SIMD::Float::infinity(),
	[](auto a, auto b) { return NMax(a, b); });
	break;

	case spv::OpGroupNonUniformLogicalAnd:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, ~0u,
	[](auto a, auto b) {
	SIMD::UInt zero = SIMD::UInt(0);
	return CmpNEQ(a, zero) & CmpNEQ(b, zero);
	});
	break;

	case spv::OpGroupNonUniformLogicalOr:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, 0,
	[](auto a, auto b) {
	SIMD::UInt zero = SIMD::UInt(0);
	return CmpNEQ(a, zero) \| CmpNEQ(b, zero);
	});
	break;

	case spv::OpGroupNonUniformLogicalXor:
	Impl::Group::BinaryOperation<SIMD::UInt>(
	this, insn, state, dst, 0,
	[](auto a, auto b) {
	SIMD::UInt zero = SIMD::UInt(0);
	return CmpNEQ(a, zero) ^ CmpNEQ(b, zero);
	});
	break;

	default:
	UNSUPPORTED("EmitGroupNonUniform op: %s", OpcodeName(type.opcode()));
	}
	return EmitResult::Continue;
	}

	} // namespace sw