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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>
namespace sw {
SpirvShader::EmitResult SpirvShader::EmitVectorTimesScalar(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, insn.word(4));
for(auto i = 0u; i < type.componentCount; i++)
{
dst.move(i, lhs.Float(i) * rhs.Float(0));
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitMatrixTimesVector(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, 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 += lhs.Float(i + type.componentCount * j) * rhs.Float(j);
}
dst.move(i, v);
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitVectorTimesMatrix(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, 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 += lhs.Float(j) * rhs.Float(i * lhs.componentCount + j);
}
dst.move(i, v);
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitMatrixTimesMatrix(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, insn.word(4));
auto numColumns = type.definition.word(3);
auto numRows = getType(type.definition.word(2)).definition.word(3);
auto numAdds = getType(getObject(insn.word(3))).definition.word(3);
for(auto row = 0u; row < numRows; row++)
{
for(auto col = 0u; col < numColumns; col++)
{
SIMD::Float v = SIMD::Float(0);
for(auto i = 0u; i < numAdds; i++)
{
v += lhs.Float(i * numRows + row) * rhs.Float(col * numAdds + i);
}
dst.move(numRows * col + row, v);
}
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitOuterProduct(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, 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));
}
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitTranspose(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto mat = Operand(this, state, insn.word(3));
auto numCols = type.definition.word(3);
auto numRows = 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));
}
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitUnaryOp(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto src = Operand(this, state, insn.word(3));
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(this, state, insn.word(4)).UInt(i);
auto offset = Operand(this, state, insn.word(5)).UInt(0);
auto count = Operand(this, state, 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(this, state, insn.word(4)).UInt(0);
auto count = Operand(this, state, 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
static_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", OpcodeName(insn.opcode()).c_str());
}
}
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitBinaryOp(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto &lhsType = getType(getObject(insn.word(3)));
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, 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:
dst.move(i, lhs.Float(i) / rhs.Float(i));
break;
case spv::OpFMod:
// TODO(b/126873455): inaccurate for values greater than 2^24
dst.move(i, lhs.Float(i) - rhs.Float(i) * Floor(lhs.Float(i) / rhs.Float(i)));
break;
case spv::OpFRem:
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", OpcodeName(insn.opcode()).c_str());
}
}
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);
return EmitResult::Continue;
}
SpirvShader::EmitResult SpirvShader::EmitDot(InsnIterator insn, EmitState *state) const
{
auto &type = getType(insn.resultTypeId());
ASSERT(type.componentCount == 1);
auto &dst = state->createIntermediate(insn.resultId(), type.componentCount);
auto &lhsType = getType(getObject(insn.word(3)));
auto lhs = Operand(this, state, insn.word(3));
auto rhs = Operand(this, state, insn.word(4));
dst.move(0, Dot(lhsType.componentCount, lhs, rhs));
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);
return EmitResult::Continue;
}
SIMD::Float SpirvShader::Dot(unsigned numComponents, Operand const &x, Operand const &y) const
{
SIMD::Float d = x.Float(0) * y.Float(0);
for(auto i = 1u; i < numComponents; i++)
{
d += x.Float(i) * y.Float(i);
}
return d;
}
std::pair<SIMD::Float, SIMD::Int> SpirvShader::Frexp(RValue<SIMD::Float> val) const
{
// Assumes IEEE 754
auto v = As<SIMD::UInt>(val);
auto isNotZero = CmpNEQ(v & SIMD::UInt(0x7FFFFFFF), SIMD::UInt(0));
auto zeroSign = v & SIMD::UInt(0x80000000) & ~isNotZero;
auto significand = As<SIMD::Float>((((v & SIMD::UInt(0x807FFFFF)) | SIMD::UInt(0x3F000000)) & isNotZero) | zeroSign);
auto exponent = Exponent(val) & SIMD::Int(isNotZero);
return std::make_pair(significand, exponent);
}
} // namespace sw