SPIRV-Tools/source/validate_derivatives.cpp

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// Copyright (c) 2017 Google Inc.
//
// 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.
// Validates correctness of derivative SPIR-V instructions.
#include "validate.h"
#include "diagnostic.h"
#include "opcode.h"
#include "val/instruction.h"
#include "val/validation_state.h"
namespace libspirv {
// Validates correctness of derivative instructions.
spv_result_t DerivativesPass(ValidationState_t& _,
const spv_parsed_instruction_t* inst) {
const SpvOp opcode = static_cast<SpvOp>(inst->opcode);
const uint32_t result_type = inst->type_id;
switch (opcode) {
case SpvOpDPdx:
case SpvOpDPdy:
case SpvOpFwidth:
case SpvOpDPdxFine:
case SpvOpDPdyFine:
case SpvOpFwidthFine:
case SpvOpDPdxCoarse:
case SpvOpDPdyCoarse:
case SpvOpFwidthCoarse: {
if (!_.IsFloatScalarOrVectorType(result_type)) {
return _.diag(SPV_ERROR_INVALID_DATA)
<< "Expected Result Type to be float scalar or vector type: "
<< spvOpcodeString(opcode);
}
const uint32_t p_type = _.GetOperandTypeId(inst, 2);
if (p_type != result_type) {
return _.diag(SPV_ERROR_INVALID_DATA)
<< "Expected P type and Result Type to be the same: "
<< spvOpcodeString(opcode);
}
_.current_function().RegisterExecutionModelLimitation(
SpvExecutionModelFragment, std::string(
"Derivative instructions require Fragment execution model: ") +
spvOpcodeString(opcode));
break;
}
default:
break;
}
return SPV_SUCCESS;
}
} // namespace libspirv