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// 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 "SpirvShaderDebug.hpp"
#include "ShaderCore.hpp"
#include <spirv/unified1/spirv.hpp>
#include <limits>
namespace sw {
void SpirvEmitter::EmitVectorTimesScalar(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
for(auto i = 0u; i < type.componentCount; i++)
{
dst.move(i, lhs.Float(i) * rhs.Float(0));
}
}
void SpirvEmitter::EmitMatrixTimesVector(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
for(auto i = 0u; i < type.componentCount; i++)
{
SIMD::Float v = lhs.Float(i) * rhs.Float(0);
for(auto j = 1u; j < rhs.componentCount; j++)
{
v = MulAdd(lhs.Float(i + type.componentCount * j), rhs.Float(j), v);
}
dst.move(i, v);
}
}
void SpirvEmitter::EmitVectorTimesMatrix(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
for(auto i = 0u; i < type.componentCount; i++)
{
SIMD::Float v = lhs.Float(0) * rhs.Float(i * lhs.componentCount);
for(auto j = 1u; j < lhs.componentCount; j++)
{
v = MulAdd(lhs.Float(j), rhs.Float(i * lhs.componentCount + j), v);
}
dst.move(i, v);
}
}
void SpirvEmitter::EmitMatrixTimesMatrix(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
auto numColumns = type.definition.word(3);
auto numRows = shader.getType(type.definition.word(2)).definition.word(3);
auto numAdds = shader.getObjectType(insn.word(3)).definition.word(3);
for(auto row = 0u; row < numRows; row++)
{
for(auto col = 0u; col < numColumns; col++)
{
SIMD::Float v = lhs.Float(row) * rhs.Float(col * numAdds);
for(auto i = 1u; i < numAdds; i++)
{
v = MulAdd(lhs.Float(i * numRows + row), rhs.Float(col * numAdds + i), v);
}
dst.move(numRows * col + row, v);
}
}
}
void SpirvEmitter::EmitOuterProduct(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
auto numRows = lhs.componentCount;
auto numCols = rhs.componentCount;
for(auto col = 0u; col < numCols; col++)
{
for(auto row = 0u; row < numRows; row++)
{
dst.move(col * numRows + row, lhs.Float(row) * rhs.Float(col));
}
}
}
void SpirvEmitter::EmitTranspose(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto mat = Operand(shader, *this, insn.word(3));
auto numCols = type.definition.word(3);
auto numRows = shader.getType(type.definition.word(2)).componentCount;
for(auto col = 0u; col < numCols; col++)
{
for(auto row = 0u; row < numRows; row++)
{
dst.move(col * numRows + row, mat.Float(row * numCols + col));
}
}
}
void SpirvEmitter::EmitBitcastPointer(Spirv::Object::ID resultID, Operand &src)
{
if(src.isPointer()) // Pointer -> Integer bits
{
if(sizeof(void *) == 4) // 32-bit pointers
{
SIMD::UInt bits;
src.Pointer().castTo(bits);
auto &dst = createIntermediate(resultID, 1);
dst.move(0, bits);
}
else // 64-bit pointers
{
ASSERT(sizeof(void *) == 8);
// Casting a 64 bit pointer into 2 32bit integers
auto &ptr = src.Pointer();
SIMD::UInt lowerBits, upperBits;
ptr.castTo(lowerBits, upperBits);
auto &dst = createIntermediate(resultID, 2);
dst.move(0, lowerBits);
dst.move(1, upperBits);
}
}
else // Integer bits -> Pointer
{
if(sizeof(void *) == 4) // 32-bit pointers
{
createPointer(resultID, SIMD::Pointer(src.UInt(0)));
}
else // 64-bit pointers
{
ASSERT(sizeof(void *) == 8);
// Casting two 32-bit integers into a 64-bit pointer
createPointer(resultID, SIMD::Pointer(src.UInt(0), src.UInt(1)));
}
}
}
void SpirvEmitter::EmitUnaryOp(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto src = Operand(shader, *this, insn.word(3));
bool dstIsPointer = shader.getObject(insn.resultId()).kind == Spirv::Object::Kind::Pointer;
bool srcIsPointer = src.isPointer();
if(srcIsPointer || dstIsPointer)
{
ASSERT(insn.opcode() == spv::OpBitcast);
ASSERT(srcIsPointer || (type.componentCount == 1)); // When the ouput is a pointer, it's a single pointer
return EmitBitcastPointer(insn.resultId(), src);
}
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
for(auto i = 0u; i < type.componentCount; i++)
{
switch(insn.opcode())
{
case spv::OpNot:
case spv::OpLogicalNot: // logical not == bitwise not due to all-bits boolean representation
dst.move(i, ~src.UInt(i));
break;
case spv::OpBitFieldInsert:
{
auto insert = Operand(shader, *this, insn.word(4)).UInt(i);
auto offset = Operand(shader, *this, insn.word(5)).UInt(0);
auto count = Operand(shader, *this, insn.word(6)).UInt(0);
auto one = SIMD::UInt(1);
auto v = src.UInt(i);
auto mask = Bitmask32(offset + count) ^ Bitmask32(offset);
dst.move(i, (v & ~mask) | ((insert << offset) & mask));
}
break;
case spv::OpBitFieldSExtract:
case spv::OpBitFieldUExtract:
{
auto offset = Operand(shader, *this, insn.word(4)).UInt(0);
auto count = Operand(shader, *this, insn.word(5)).UInt(0);
auto one = SIMD::UInt(1);
auto v = src.UInt(i);
SIMD::UInt out = (v >> offset) & Bitmask32(count);
if(insn.opcode() == spv::OpBitFieldSExtract)
{
auto sign = out & NthBit32(count - one);
auto sext = ~(sign - one);
out |= sext;
}
dst.move(i, out);
}
break;
case spv::OpBitReverse:
{
// TODO: Add an intrinsic to reactor. Even if there isn't a
// single vector instruction, there may be target-dependent
// ways to make this faster.
// https://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel
SIMD::UInt v = src.UInt(i);
v = ((v >> 1) & SIMD::UInt(0x55555555)) | ((v & SIMD::UInt(0x55555555)) << 1);
v = ((v >> 2) & SIMD::UInt(0x33333333)) | ((v & SIMD::UInt(0x33333333)) << 2);
v = ((v >> 4) & SIMD::UInt(0x0F0F0F0F)) | ((v & SIMD::UInt(0x0F0F0F0F)) << 4);
v = ((v >> 8) & SIMD::UInt(0x00FF00FF)) | ((v & SIMD::UInt(0x00FF00FF)) << 8);
v = (v >> 16) | (v << 16);
dst.move(i, v);
}
break;
case spv::OpBitCount:
dst.move(i, CountBits(src.UInt(i)));
break;
case spv::OpSNegate:
dst.move(i, -src.Int(i));
break;
case spv::OpFNegate:
dst.move(i, -src.Float(i));
break;
case spv::OpConvertFToU:
dst.move(i, SIMD::UInt(src.Float(i)));
break;
case spv::OpConvertFToS:
dst.move(i, SIMD::Int(src.Float(i)));
break;
case spv::OpConvertSToF:
dst.move(i, SIMD::Float(src.Int(i)));
break;
case spv::OpConvertUToF:
dst.move(i, SIMD::Float(src.UInt(i)));
break;
case spv::OpBitcast:
dst.move(i, src.Float(i));
break;
case spv::OpIsInf:
dst.move(i, IsInf(src.Float(i)));
break;
case spv::OpIsNan:
dst.move(i, IsNan(src.Float(i)));
break;
case spv::OpDPdx:
case spv::OpDPdxCoarse:
// Derivative instructions: FS invocations are laid out like so:
// 0 1
// 2 3
ASSERT(SIMD::Width == 4); // All cross-lane instructions will need care when using a different width
dst.move(i, SIMD::Float(Extract(src.Float(i), 1) - Extract(src.Float(i), 0)));
break;
case spv::OpDPdy:
case spv::OpDPdyCoarse:
dst.move(i, SIMD::Float(Extract(src.Float(i), 2) - Extract(src.Float(i), 0)));
break;
case spv::OpFwidth:
case spv::OpFwidthCoarse:
dst.move(i, SIMD::Float(Abs(Extract(src.Float(i), 1) - Extract(src.Float(i), 0)) + Abs(Extract(src.Float(i), 2) - Extract(src.Float(i), 0))));
break;
case spv::OpDPdxFine:
{
auto firstRow = Extract(src.Float(i), 1) - Extract(src.Float(i), 0);
auto secondRow = Extract(src.Float(i), 3) - Extract(src.Float(i), 2);
SIMD::Float v = SIMD::Float(firstRow);
v = Insert(v, secondRow, 2);
v = Insert(v, secondRow, 3);
dst.move(i, v);
}
break;
case spv::OpDPdyFine:
{
auto firstColumn = Extract(src.Float(i), 2) - Extract(src.Float(i), 0);
auto secondColumn = Extract(src.Float(i), 3) - Extract(src.Float(i), 1);
SIMD::Float v = SIMD::Float(firstColumn);
v = Insert(v, secondColumn, 1);
v = Insert(v, secondColumn, 3);
dst.move(i, v);
}
break;
case spv::OpFwidthFine:
{
auto firstRow = Extract(src.Float(i), 1) - Extract(src.Float(i), 0);
auto secondRow = Extract(src.Float(i), 3) - Extract(src.Float(i), 2);
SIMD::Float dpdx = SIMD::Float(firstRow);
dpdx = Insert(dpdx, secondRow, 2);
dpdx = Insert(dpdx, secondRow, 3);
auto firstColumn = Extract(src.Float(i), 2) - Extract(src.Float(i), 0);
auto secondColumn = Extract(src.Float(i), 3) - Extract(src.Float(i), 1);
SIMD::Float dpdy = SIMD::Float(firstColumn);
dpdy = Insert(dpdy, secondColumn, 1);
dpdy = Insert(dpdy, secondColumn, 3);
dst.move(i, Abs(dpdx) + Abs(dpdy));
}
break;
case spv::OpQuantizeToF16:
{
// Note: keep in sync with the specialization constant version in EvalSpecConstantUnaryOp
auto abs = Abs(src.Float(i));
auto sign = src.Int(i) & SIMD::Int(0x80000000);
auto isZero = CmpLT(abs, SIMD::Float(0.000061035f));
auto isInf = CmpGT(abs, SIMD::Float(65504.0f));
auto isNaN = IsNan(abs);
auto isInfOrNan = isInf | isNaN;
SIMD::Int v = src.Int(i) & SIMD::Int(0xFFFFE000);
v &= ~isZero | SIMD::Int(0x80000000);
v = sign | (isInfOrNan & SIMD::Int(0x7F800000)) | (~isInfOrNan & v);
v |= isNaN & SIMD::Int(0x400000);
dst.move(i, v);
}
break;
default:
UNREACHABLE("%s", shader.OpcodeName(insn.opcode()));
}
}
}
void SpirvEmitter::EmitBinaryOp(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto &lhsType = shader.getObjectType(insn.word(3));
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
for(auto i = 0u; i < lhsType.componentCount; i++)
{
switch(insn.opcode())
{
case spv::OpIAdd:
dst.move(i, lhs.Int(i) + rhs.Int(i));
break;
case spv::OpISub:
dst.move(i, lhs.Int(i) - rhs.Int(i));
break;
case spv::OpIMul:
dst.move(i, lhs.Int(i) * rhs.Int(i));
break;
case spv::OpSDiv:
{
SIMD::Int a = lhs.Int(i);
SIMD::Int b = rhs.Int(i);
b = b | CmpEQ(b, SIMD::Int(0)); // prevent divide-by-zero
a = a | (CmpEQ(a, SIMD::Int(0x80000000)) & CmpEQ(b, SIMD::Int(-1))); // prevent integer overflow
dst.move(i, a / b);
}
break;
case spv::OpUDiv:
{
auto zeroMask = As<SIMD::UInt>(CmpEQ(rhs.Int(i), SIMD::Int(0)));
dst.move(i, lhs.UInt(i) / (rhs.UInt(i) | zeroMask));
}
break;
case spv::OpSRem:
{
SIMD::Int a = lhs.Int(i);
SIMD::Int b = rhs.Int(i);
b = b | CmpEQ(b, SIMD::Int(0)); // prevent divide-by-zero
a = a | (CmpEQ(a, SIMD::Int(0x80000000)) & CmpEQ(b, SIMD::Int(-1))); // prevent integer overflow
dst.move(i, a % b);
}
break;
case spv::OpSMod:
{
SIMD::Int a = lhs.Int(i);
SIMD::Int b = rhs.Int(i);
b = b | CmpEQ(b, SIMD::Int(0)); // prevent divide-by-zero
a = a | (CmpEQ(a, SIMD::Int(0x80000000)) & CmpEQ(b, SIMD::Int(-1))); // prevent integer overflow
auto mod = a % b;
// If a and b have opposite signs, the remainder operation takes
// the sign from a but OpSMod is supposed to take the sign of b.
// Adding b will ensure that the result has the correct sign and
// that it is still congruent to a modulo b.
//
// See also http://mathforum.org/library/drmath/view/52343.html
auto signDiff = CmpNEQ(CmpGE(a, SIMD::Int(0)), CmpGE(b, SIMD::Int(0)));
auto fixedMod = mod + (b & CmpNEQ(mod, SIMD::Int(0)) & signDiff);
dst.move(i, As<SIMD::Float>(fixedMod));
}
break;
case spv::OpUMod:
{
auto zeroMask = As<SIMD::UInt>(CmpEQ(rhs.Int(i), SIMD::Int(0)));
dst.move(i, lhs.UInt(i) % (rhs.UInt(i) | zeroMask));
}
break;
case spv::OpIEqual:
case spv::OpLogicalEqual:
dst.move(i, CmpEQ(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpINotEqual:
case spv::OpLogicalNotEqual:
dst.move(i, CmpNEQ(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpUGreaterThan:
dst.move(i, CmpGT(lhs.UInt(i), rhs.UInt(i)));
break;
case spv::OpSGreaterThan:
dst.move(i, CmpGT(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpUGreaterThanEqual:
dst.move(i, CmpGE(lhs.UInt(i), rhs.UInt(i)));
break;
case spv::OpSGreaterThanEqual:
dst.move(i, CmpGE(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpULessThan:
dst.move(i, CmpLT(lhs.UInt(i), rhs.UInt(i)));
break;
case spv::OpSLessThan:
dst.move(i, CmpLT(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpULessThanEqual:
dst.move(i, CmpLE(lhs.UInt(i), rhs.UInt(i)));
break;
case spv::OpSLessThanEqual:
dst.move(i, CmpLE(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpFAdd:
dst.move(i, lhs.Float(i) + rhs.Float(i));
break;
case spv::OpFSub:
dst.move(i, lhs.Float(i) - rhs.Float(i));
break;
case spv::OpFMul:
dst.move(i, lhs.Float(i) * rhs.Float(i));
break;
case spv::OpFDiv:
// TODO(b/169760262): Optimize using reciprocal instructions (2.5 ULP).
// TODO(b/222218659): Optimize for RelaxedPrecision (2.5 ULP).
dst.move(i, lhs.Float(i) / rhs.Float(i));
break;
case spv::OpFMod:
// TODO(b/126873455): Inaccurate for values greater than 2^24.
// TODO(b/169760262): Optimize using reciprocal instructions.
// TODO(b/222218659): Optimize for RelaxedPrecision.
dst.move(i, lhs.Float(i) - rhs.Float(i) * Floor(lhs.Float(i) / rhs.Float(i)));
break;
case spv::OpFRem:
// TODO(b/169760262): Optimize using reciprocal instructions.
// TODO(b/222218659): Optimize for RelaxedPrecision.
dst.move(i, lhs.Float(i) % rhs.Float(i));
break;
case spv::OpFOrdEqual:
dst.move(i, CmpEQ(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordEqual:
dst.move(i, CmpUEQ(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFOrdNotEqual:
dst.move(i, CmpNEQ(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordNotEqual:
dst.move(i, CmpUNEQ(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFOrdLessThan:
dst.move(i, CmpLT(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordLessThan:
dst.move(i, CmpULT(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFOrdGreaterThan:
dst.move(i, CmpGT(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordGreaterThan:
dst.move(i, CmpUGT(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFOrdLessThanEqual:
dst.move(i, CmpLE(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordLessThanEqual:
dst.move(i, CmpULE(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFOrdGreaterThanEqual:
dst.move(i, CmpGE(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpFUnordGreaterThanEqual:
dst.move(i, CmpUGE(lhs.Float(i), rhs.Float(i)));
break;
case spv::OpShiftRightLogical:
dst.move(i, lhs.UInt(i) >> rhs.UInt(i));
break;
case spv::OpShiftRightArithmetic:
dst.move(i, lhs.Int(i) >> rhs.Int(i));
break;
case spv::OpShiftLeftLogical:
dst.move(i, lhs.UInt(i) << rhs.UInt(i));
break;
case spv::OpBitwiseOr:
case spv::OpLogicalOr:
dst.move(i, lhs.UInt(i) | rhs.UInt(i));
break;
case spv::OpBitwiseXor:
dst.move(i, lhs.UInt(i) ^ rhs.UInt(i));
break;
case spv::OpBitwiseAnd:
case spv::OpLogicalAnd:
dst.move(i, lhs.UInt(i) & rhs.UInt(i));
break;
case spv::OpSMulExtended:
// Extended ops: result is a structure containing two members of the same type as lhs & rhs.
// In our flat view then, component i is the i'th component of the first member;
// component i + N is the i'th component of the second member.
dst.move(i, lhs.Int(i) * rhs.Int(i));
dst.move(i + lhsType.componentCount, MulHigh(lhs.Int(i), rhs.Int(i)));
break;
case spv::OpUMulExtended:
dst.move(i, lhs.UInt(i) * rhs.UInt(i));
dst.move(i + lhsType.componentCount, MulHigh(lhs.UInt(i), rhs.UInt(i)));
break;
case spv::OpIAddCarry:
dst.move(i, lhs.UInt(i) + rhs.UInt(i));
dst.move(i + lhsType.componentCount, CmpLT(dst.UInt(i), lhs.UInt(i)) >> 31);
break;
case spv::OpISubBorrow:
dst.move(i, lhs.UInt(i) - rhs.UInt(i));
dst.move(i + lhsType.componentCount, CmpLT(lhs.UInt(i), rhs.UInt(i)) >> 31);
break;
default:
UNREACHABLE("%s", shader.OpcodeName(insn.opcode()));
}
}
SPIRV_SHADER_DBG("{0}: {1}", insn.word(2), dst);
SPIRV_SHADER_DBG("{0}: {1}", insn.word(3), lhs);
SPIRV_SHADER_DBG("{0}: {1}", insn.word(4), rhs);
}
void SpirvEmitter::EmitDot(Spirv::InsnIterator insn)
{
auto &type = shader.getType(insn.resultTypeId());
ASSERT(type.componentCount == 1);
auto &dst = createIntermediate(insn.resultId(), type.componentCount);
auto &lhsType = shader.getObjectType(insn.word(3));
auto lhs = Operand(shader, *this, insn.word(3));
auto rhs = Operand(shader, *this, insn.word(4));
auto opcode = insn.opcode();
switch(opcode)
{
case spv::OpDot:
dst.move(0, FDot(lhsType.componentCount, lhs, rhs));
break;
case spv::OpSDot:
dst.move(0, SDot(lhsType.componentCount, lhs, rhs, nullptr));
break;
case spv::OpUDot:
dst.move(0, UDot(lhsType.componentCount, lhs, rhs, nullptr));
break;
case spv::OpSUDot:
dst.move(0, SUDot(lhsType.componentCount, lhs, rhs, nullptr));
break;
case spv::OpSDotAccSat:
{
auto accum = Operand(shader, *this, insn.word(5));
dst.move(0, SDot(lhsType.componentCount, lhs, rhs, &accum));
}
break;
case spv::OpUDotAccSat:
{
auto accum = Operand(shader, *this, insn.word(5));
dst.move(0, UDot(lhsType.componentCount, lhs, rhs, &accum));
}
break;
case spv::OpSUDotAccSat:
{
auto accum = Operand(shader, *this, insn.word(5));
dst.move(0, SUDot(lhsType.componentCount, lhs, rhs, &accum));
}
break;
default:
UNREACHABLE("%s", shader.OpcodeName(opcode));
break;
}
SPIRV_SHADER_DBG("{0}: {1}", insn.resultId(), dst);
SPIRV_SHADER_DBG("{0}: {1}", insn.word(3), lhs);
SPIRV_SHADER_DBG("{0}: {1}", insn.word(4), rhs);
}
SIMD::Float SpirvEmitter::FDot(unsigned numComponents, const Operand &x, const Operand &y)
{
SIMD::Float d = x.Float(0) * y.Float(0);
for(auto i = 1u; i < numComponents; i++)
{
d = MulAdd(x.Float(i), y.Float(i), d);
}
return d;
}
SIMD::Int SpirvEmitter::SDot(unsigned numComponents, const Operand &x, const Operand &y, const Operand *accum)
{
SIMD::Int d(0);
if(numComponents == 1) // 4x8bit packed
{
numComponents = 4;
for(auto i = 0u; i < numComponents; i++)
{
Int4 xs(As<SByte4>(Extract(x.Int(0), i)));
Int4 ys(As<SByte4>(Extract(y.Int(0), i)));
Int4 xy = xs * ys;
rr::Int sum = Extract(xy, 0) + Extract(xy, 1) + Extract(xy, 2) + Extract(xy, 3);
d = Insert(d, sum, i);
}
}
else
{
d = x.Int(0) * y.Int(0);
for(auto i = 1u; i < numComponents; i++)
{
d += x.Int(i) * y.Int(i);
}
}
if(accum)
{
d = AddSat(d, accum->Int(0));
}
return d;
}
SIMD::UInt SpirvEmitter::UDot(unsigned numComponents, const Operand &x, const Operand &y, const Operand *accum)
{
SIMD::UInt d(0);
if(numComponents == 1) // 4x8bit packed
{
numComponents = 4;
for(auto i = 0u; i < numComponents; i++)
{
Int4 xs(As<Byte4>(Extract(x.Int(0), i)));
Int4 ys(As<Byte4>(Extract(y.Int(0), i)));
UInt4 xy = xs * ys;
rr::UInt sum = Extract(xy, 0) + Extract(xy, 1) + Extract(xy, 2) + Extract(xy, 3);
d = Insert(d, sum, i);
}
}
else
{
d = x.UInt(0) * y.UInt(0);
for(auto i = 1u; i < numComponents; i++)
{
d += x.UInt(i) * y.UInt(i);
}
}
if(accum)
{
d = AddSat(d, accum->UInt(0));
}
return d;
}
SIMD::Int SpirvEmitter::SUDot(unsigned numComponents, const Operand &x, const Operand &y, const Operand *accum)
{
SIMD::Int d(0);
if(numComponents == 1) // 4x8bit packed
{
numComponents = 4;
for(auto i = 0u; i < numComponents; i++)
{
Int4 xs(As<SByte4>(Extract(x.Int(0), i)));
Int4 ys(As<Byte4>(Extract(y.Int(0), i)));
Int4 xy = xs * ys;
rr::Int sum = Extract(xy, 0) + Extract(xy, 1) + Extract(xy, 2) + Extract(xy, 3);
d = Insert(d, sum, i);
}
}
else
{
d = x.Int(0) * As<SIMD::Int>(y.UInt(0));
for(auto i = 1u; i < numComponents; i++)
{
d += x.Int(i) * As<SIMD::Int>(y.UInt(i));
}
}
if(accum)
{
d = AddSat(d, accum->Int(0));
}
return d;
}
SIMD::Int SpirvEmitter::AddSat(RValue<SIMD::Int> a, RValue<SIMD::Int> b)
{
SIMD::Int sum = a + b;
SIMD::Int sSign = sum >> 31;
SIMD::Int aSign = a >> 31;
SIMD::Int bSign = b >> 31;
// Overflow happened if both numbers added have the same sign and the sum has a different sign
SIMD::Int oob = ~(aSign ^ bSign) & (aSign ^ sSign);
SIMD::Int overflow = oob & sSign;
SIMD::Int underflow = oob & aSign;
return (overflow & std::numeric_limits<int32_t>::max()) |
(underflow & std::numeric_limits<int32_t>::min()) |
(~oob & sum);
}
SIMD::UInt SpirvEmitter::AddSat(RValue<SIMD::UInt> a, RValue<SIMD::UInt> b)
{
SIMD::UInt sum = a + b;
// Overflow happened if the sum of unsigned integers is smaller than either of the 2 numbers being added
// Note: CmpLT()'s return value is automatically set to UINT_MAX when true
return CmpLT(sum, a) | sum;
}
} // namespace sw