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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 <spirv/unified1/spirv.hpp>
namespace sw {
void Spirv::EvalSpecConstantOp(InsnIterator insn)
{
auto opcode = static_cast<spv::Op>(insn.word(3));
switch(opcode)
{
case spv::OpIAdd:
case spv::OpISub:
case spv::OpIMul:
case spv::OpUDiv:
case spv::OpSDiv:
case spv::OpUMod:
case spv::OpSMod:
case spv::OpSRem:
case spv::OpShiftRightLogical:
case spv::OpShiftRightArithmetic:
case spv::OpShiftLeftLogical:
case spv::OpBitwiseOr:
case spv::OpLogicalOr:
case spv::OpBitwiseAnd:
case spv::OpLogicalAnd:
case spv::OpBitwiseXor:
case spv::OpLogicalEqual:
case spv::OpIEqual:
case spv::OpLogicalNotEqual:
case spv::OpINotEqual:
case spv::OpULessThan:
case spv::OpSLessThan:
case spv::OpUGreaterThan:
case spv::OpSGreaterThan:
case spv::OpULessThanEqual:
case spv::OpSLessThanEqual:
case spv::OpUGreaterThanEqual:
case spv::OpSGreaterThanEqual:
EvalSpecConstantBinaryOp(insn);
break;
case spv::OpSConvert:
case spv::OpFConvert:
case spv::OpUConvert:
case spv::OpSNegate:
case spv::OpNot:
case spv::OpLogicalNot:
case spv::OpQuantizeToF16:
EvalSpecConstantUnaryOp(insn);
break;
case spv::OpSelect:
{
auto &result = CreateConstant(insn);
const auto &cond = getObject(insn.word(4));
auto condIsScalar = (getType(cond).componentCount == 1);
const auto &left = getObject(insn.word(5));
const auto &right = getObject(insn.word(6));
for(auto i = 0u; i < getType(result).componentCount; i++)
{
auto sel = cond.constantValue[condIsScalar ? 0 : i];
result.constantValue[i] = sel ? left.constantValue[i] : right.constantValue[i];
}
break;
}
case spv::OpCompositeExtract:
{
auto &result = CreateConstant(insn);
const auto &compositeObject = getObject(insn.word(4));
auto firstComponent = WalkLiteralAccessChain(compositeObject.typeId(), Span(insn, 5, insn.wordCount() - 5));
for(auto i = 0u; i < getType(result).componentCount; i++)
{
result.constantValue[i] = compositeObject.constantValue[firstComponent + i];
}
break;
}
case spv::OpCompositeInsert:
{
auto &result = CreateConstant(insn);
const auto &newPart = getObject(insn.word(4));
const auto &oldObject = getObject(insn.word(5));
auto firstNewComponent = WalkLiteralAccessChain(result.typeId(), Span(insn, 6, insn.wordCount() - 6));
// old components before
for(auto i = 0u; i < firstNewComponent; i++)
{
result.constantValue[i] = oldObject.constantValue[i];
}
// new part
for(auto i = 0u; i < getType(newPart).componentCount; i++)
{
result.constantValue[firstNewComponent + i] = newPart.constantValue[i];
}
// old components after
for(auto i = firstNewComponent + getType(newPart).componentCount; i < getType(result).componentCount; i++)
{
result.constantValue[i] = oldObject.constantValue[i];
}
break;
}
case spv::OpVectorShuffle:
{
auto &result = CreateConstant(insn);
const auto &firstHalf = getObject(insn.word(4));
const auto &secondHalf = getObject(insn.word(5));
for(auto i = 0u; i < getType(result).componentCount; i++)
{
auto selector = insn.word(6 + i);
if(selector == static_cast<uint32_t>(-1))
{
// Undefined value, we'll use zero
result.constantValue[i] = 0;
}
else if(selector < getType(firstHalf).componentCount)
{
result.constantValue[i] = firstHalf.constantValue[selector];
}
else
{
result.constantValue[i] = secondHalf.constantValue[selector - getType(firstHalf).componentCount];
}
}
break;
}
default:
// Other spec constant ops are possible, but require capabilities that are
// not exposed in our Vulkan implementation (eg Kernel), so we should never
// get here for correct shaders.
UNSUPPORTED("EvalSpecConstantOp op: %s", OpcodeName(opcode));
}
}
void Spirv::EvalSpecConstantUnaryOp(InsnIterator insn)
{
auto &result = CreateConstant(insn);
auto opcode = static_cast<spv::Op>(insn.word(3));
const auto &lhs = getObject(insn.word(4));
auto size = getType(lhs).componentCount;
for(auto i = 0u; i < size; i++)
{
auto &v = result.constantValue[i];
auto l = lhs.constantValue[i];
switch(opcode)
{
case spv::OpSConvert:
case spv::OpFConvert:
case spv::OpUConvert:
UNREACHABLE("Not possible until we have multiple bit widths");
break;
case spv::OpSNegate:
v = -(int)l;
break;
case spv::OpNot:
case spv::OpLogicalNot:
v = ~l;
break;
case spv::OpQuantizeToF16:
{
// Can do this nicer with host code, but want to perfectly mirror the reactor code we emit.
auto abs = bit_cast<float>(l & 0x7FFFFFFF);
auto sign = l & 0x80000000;
auto isZero = abs < 0.000061035f ? ~0u : 0u;
auto isInf = abs > 65504.0f ? ~0u : 0u;
auto isNaN = (abs != abs) ? ~0u : 0u;
auto isInfOrNan = isInf | isNaN;
v = l & 0xFFFFE000;
v &= ~isZero | 0x80000000;
v = sign | (isInfOrNan & 0x7F800000) | (~isInfOrNan & v);
v |= isNaN & 0x400000;
}
break;
default:
UNREACHABLE("EvalSpecConstantUnaryOp op: %s", OpcodeName(opcode));
}
}
}
void Spirv::EvalSpecConstantBinaryOp(InsnIterator insn)
{
auto &result = CreateConstant(insn);
auto opcode = static_cast<spv::Op>(insn.word(3));
const auto &lhs = getObject(insn.word(4));
const auto &rhs = getObject(insn.word(5));
auto size = getType(lhs).componentCount;
for(auto i = 0u; i < size; i++)
{
auto &v = result.constantValue[i];
auto l = lhs.constantValue[i];
auto r = rhs.constantValue[i];
switch(opcode)
{
case spv::OpIAdd:
v = l + r;
break;
case spv::OpISub:
v = l - r;
break;
case spv::OpIMul:
v = l * r;
break;
case spv::OpUDiv:
v = (r == 0) ? 0 : l / r;
break;
case spv::OpUMod:
v = (r == 0) ? 0 : l % r;
break;
case spv::OpSDiv:
if(r == 0) r = UINT32_MAX;
if(l == static_cast<uint32_t>(INT32_MIN)) l = UINT32_MAX;
v = static_cast<int32_t>(l) / static_cast<int32_t>(r);
break;
case spv::OpSRem:
if(r == 0) r = UINT32_MAX;
if(l == static_cast<uint32_t>(INT32_MIN)) l = UINT32_MAX;
v = static_cast<int32_t>(l) % static_cast<int32_t>(r);
break;
case spv::OpSMod:
if(r == 0) r = UINT32_MAX;
if(l == static_cast<uint32_t>(INT32_MIN)) l = UINT32_MAX;
// Test if a signed-multiply would be negative.
v = static_cast<int32_t>(l) % static_cast<int32_t>(r);
if((v & 0x80000000) != (r & 0x80000000))
v += r;
break;
case spv::OpShiftRightLogical:
v = l >> r;
break;
case spv::OpShiftRightArithmetic:
v = static_cast<int32_t>(l) >> r;
break;
case spv::OpShiftLeftLogical:
v = l << r;
break;
case spv::OpBitwiseOr:
case spv::OpLogicalOr:
v = l | r;
break;
case spv::OpBitwiseAnd:
case spv::OpLogicalAnd:
v = l & r;
break;
case spv::OpBitwiseXor:
v = l ^ r;
break;
case spv::OpLogicalEqual:
case spv::OpIEqual:
v = (l == r) ? ~0u : 0u;
break;
case spv::OpLogicalNotEqual:
case spv::OpINotEqual:
v = (l != r) ? ~0u : 0u;
break;
case spv::OpULessThan:
v = l < r ? ~0u : 0u;
break;
case spv::OpSLessThan:
v = static_cast<int32_t>(l) < static_cast<int32_t>(r) ? ~0u : 0u;
break;
case spv::OpUGreaterThan:
v = l > r ? ~0u : 0u;
break;
case spv::OpSGreaterThan:
v = static_cast<int32_t>(l) > static_cast<int32_t>(r) ? ~0u : 0u;
break;
case spv::OpULessThanEqual:
v = l <= r ? ~0u : 0u;
break;
case spv::OpSLessThanEqual:
v = static_cast<int32_t>(l) <= static_cast<int32_t>(r) ? ~0u : 0u;
break;
case spv::OpUGreaterThanEqual:
v = l >= r ? ~0u : 0u;
break;
case spv::OpSGreaterThanEqual:
v = static_cast<int32_t>(l) >= static_cast<int32_t>(r) ? ~0u : 0u;
break;
default:
UNREACHABLE("EvalSpecConstantBinaryOp op: %s", OpcodeName(opcode));
}
}
}
} // namespace sw