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// Copyright 2023 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "src/tint/lang/wgsl/reader/lower/lower.h"
#include <utility>
#include "src/tint/lang/core/builtin_fn.h"
#include "src/tint/lang/core/ir/builder.h"
#include "src/tint/lang/core/ir/core_builtin_call.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/wgsl/builtin_fn.h"
#include "src/tint/lang/wgsl/ir/builtin_call.h"
#include "src/tint/utils/ice/ice.h"
namespace tint::wgsl::reader {
namespace {
core::BuiltinFn Convert(wgsl::BuiltinFn fn) {
#define CASE(NAME) \
case wgsl::BuiltinFn::NAME: \
return core::BuiltinFn::NAME;
switch (fn) {
CASE(kAbs)
CASE(kAcos)
CASE(kAcosh)
CASE(kAll)
CASE(kAny)
CASE(kArrayLength)
CASE(kAsin)
CASE(kAsinh)
CASE(kAtan)
CASE(kAtan2)
CASE(kAtanh)
CASE(kCeil)
CASE(kClamp)
CASE(kCos)
CASE(kCosh)
CASE(kCountLeadingZeros)
CASE(kCountOneBits)
CASE(kCountTrailingZeros)
CASE(kCross)
CASE(kDegrees)
CASE(kDeterminant)
CASE(kDistance)
CASE(kDot)
CASE(kDot4I8Packed)
CASE(kDot4U8Packed)
CASE(kDpdx)
CASE(kDpdxCoarse)
CASE(kDpdxFine)
CASE(kDpdy)
CASE(kDpdyCoarse)
CASE(kDpdyFine)
CASE(kExp)
CASE(kExp2)
CASE(kExtractBits)
CASE(kFaceForward)
CASE(kFirstLeadingBit)
CASE(kFirstTrailingBit)
CASE(kFloor)
CASE(kFma)
CASE(kFract)
CASE(kFrexp)
CASE(kFwidth)
CASE(kFwidthCoarse)
CASE(kFwidthFine)
CASE(kInsertBits)
CASE(kInverseSqrt)
CASE(kLdexp)
CASE(kLength)
CASE(kLog)
CASE(kLog2)
CASE(kMax)
CASE(kMin)
CASE(kMix)
CASE(kModf)
CASE(kNormalize)
CASE(kPack2X16Float)
CASE(kPack2X16Snorm)
CASE(kPack2X16Unorm)
CASE(kPack4X8Snorm)
CASE(kPack4X8Unorm)
CASE(kPack4XI8)
CASE(kPack4XU8)
CASE(kPack4XI8Clamp)
CASE(kPack4XU8Clamp)
CASE(kPow)
CASE(kQuantizeToF16)
CASE(kRadians)
CASE(kReflect)
CASE(kRefract)
CASE(kReverseBits)
CASE(kRound)
CASE(kSaturate)
CASE(kSelect)
CASE(kSign)
CASE(kSin)
CASE(kSinh)
CASE(kSmoothstep)
CASE(kSqrt)
CASE(kStep)
CASE(kStorageBarrier)
CASE(kTan)
CASE(kTanh)
CASE(kTranspose)
CASE(kTrunc)
CASE(kUnpack2X16Float)
CASE(kUnpack2X16Snorm)
CASE(kUnpack2X16Unorm)
CASE(kUnpack4X8Snorm)
CASE(kUnpack4X8Unorm)
CASE(kUnpack4XI8)
CASE(kUnpack4XU8)
CASE(kWorkgroupBarrier)
CASE(kTextureBarrier)
CASE(kTextureDimensions)
CASE(kTextureGather)
CASE(kTextureGatherCompare)
CASE(kTextureNumLayers)
CASE(kTextureNumLevels)
CASE(kTextureNumSamples)
CASE(kTextureSample)
CASE(kTextureSampleBias)
CASE(kTextureSampleCompare)
CASE(kTextureSampleCompareLevel)
CASE(kTextureSampleGrad)
CASE(kTextureSampleLevel)
CASE(kTextureSampleBaseClampToEdge)
CASE(kTextureStore)
CASE(kTextureLoad)
CASE(kAtomicLoad)
CASE(kAtomicStore)
CASE(kAtomicAdd)
CASE(kAtomicSub)
CASE(kAtomicMax)
CASE(kAtomicMin)
CASE(kAtomicAnd)
CASE(kAtomicOr)
CASE(kAtomicXor)
CASE(kAtomicExchange)
CASE(kAtomicCompareExchangeWeak)
CASE(kSubgroupBallot)
CASE(kSubgroupBroadcast)
case tint::wgsl::BuiltinFn::kBitcast: // should lower to ir::Bitcast
case tint::wgsl::BuiltinFn::kWorkgroupUniformLoad: // should be handled in Lower()
case tint::wgsl::BuiltinFn::kTintMaterialize:
case tint::wgsl::BuiltinFn::kNone:
break;
}
TINT_ICE() << "unhandled builtin function: " << fn;
}
} // namespace
Result<SuccessType> Lower(core::ir::Module& mod) {
if (auto res = core::ir::ValidateAndDumpIfNeeded(mod, "lowering from WGSL"); res != Success) {
return res.Failure();
}
core::ir::Builder b{mod};
core::type::Manager& ty{mod.Types()};
for (auto* inst : mod.Instructions()) {
if (auto* call = inst->As<wgsl::ir::BuiltinCall>()) {
switch (call->Func()) {
case BuiltinFn::kWorkgroupUniformLoad: {
// Replace:
// %value = call workgroupUniformLoad %ptr
// With:
// call workgroupBarrier
// %value = load &ptr
// call workgroupBarrier
b.InsertBefore(call, [&] {
b.Call(ty.void_(), core::BuiltinFn::kWorkgroupBarrier);
b.LoadWithResult(call->DetachResult(), call->Args()[0]);
b.Call(ty.void_(), core::BuiltinFn::kWorkgroupBarrier);
});
break;
}
default: {
Vector<core::ir::Value*, 8> args(call->Args());
auto* replacement = b.CallWithResult(call->DetachResult(),
Convert(call->Func()), std::move(args));
call->ReplaceWith(replacement);
break;
}
}
call->Destroy();
}
}
return Success;
}
} // namespace tint::wgsl::reader