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dawn-cmake/src/tint/resolver/const_eval.cc
Antonio Maiorano d060f36a1c tint: refactor Number<T> constants for highest, lowest, etc. 
Bug: tint:1581
Change-Id: I3945e8d6021370e5b9837e77d29eeb46fcb97082
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97560
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
2022-07-29 17:12:01 +00:00

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// Copyright 2022 The Tint Authors.
//
// 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 "src/tint/resolver/const_eval.h"
#include <algorithm>
#include <limits>
#include <optional>
#include <string>
#include <type_traits>
#include <unordered_map>
#include <utility>
#include "src/tint/program_builder.h"
#include "src/tint/sem/abstract_float.h"
#include "src/tint/sem/abstract_int.h"
#include "src/tint/sem/array.h"
#include "src/tint/sem/bool.h"
#include "src/tint/sem/constant.h"
#include "src/tint/sem/f16.h"
#include "src/tint/sem/f32.h"
#include "src/tint/sem/i32.h"
#include "src/tint/sem/matrix.h"
#include "src/tint/sem/member_accessor_expression.h"
#include "src/tint/sem/type_constructor.h"
#include "src/tint/sem/u32.h"
#include "src/tint/sem/vector.h"
#include "src/tint/utils/compiler_macros.h"
#include "src/tint/utils/map.h"
#include "src/tint/utils/transform.h"
using namespace tint::number_suffixes; // NOLINT
namespace tint::resolver {
namespace {
/// Returns the first element of a parameter pack
template <typename T>
T First(T&& first, ...) {
return std::forward<T>(first);
}
/// Helper that calls `f` passing in the value of all `cs`.
/// Assumes all `cs` are of the same type.
template <typename F, typename... CONSTANTS>
auto Dispatch_ia_iu32(F&& f, CONSTANTS&&... cs) {
return Switch(
First(cs...)->Type(), //
[&](const sem::AbstractInt*) { return f(cs->template As<AInt>()...); },
[&](const sem::I32*) { return f(cs->template As<i32>()...); },
[&](const sem::U32*) { return f(cs->template As<u32>()...); });
}
/// Helper that calls `f` passing in the value of all `cs`.
/// Assumes all `cs` are of the same type.
template <typename F, typename... CONSTANTS>
auto Dispatch_fia_fi32_f16(F&& f, CONSTANTS&&... cs) {
return Switch(
First(cs...)->Type(), //
[&](const sem::AbstractInt*) { return f(cs->template As<AInt>()...); },
[&](const sem::AbstractFloat*) { return f(cs->template As<AFloat>()...); },
[&](const sem::F32*) { return f(cs->template As<f32>()...); },
[&](const sem::I32*) { return f(cs->template As<i32>()...); },
[&](const sem::F16*) { return f(cs->template As<f16>()...); });
}
/// Helper that calls `f` passing in the value of all `cs`.
/// Assumes all `cs` are of the same type.
template <typename F, typename... CONSTANTS>
auto Dispatch_fia_fiu32_f16(F&& f, CONSTANTS&&... cs) {
return Switch(
First(cs...)->Type(), //
[&](const sem::AbstractInt*) { return f(cs->template As<AInt>()...); },
[&](const sem::AbstractFloat*) { return f(cs->template As<AFloat>()...); },
[&](const sem::F32*) { return f(cs->template As<f32>()...); },
[&](const sem::I32*) { return f(cs->template As<i32>()...); },
[&](const sem::U32*) { return f(cs->template As<u32>()...); },
[&](const sem::F16*) { return f(cs->template As<f16>()...); });
}
/// Helper that calls `f` passing in the value of all `cs`.
/// Assumes all `cs` are of the same type.
template <typename F, typename... CONSTANTS>
auto Dispatch_fa_f32_f16(F&& f, CONSTANTS&&... cs) {
return Switch(
First(cs...)->Type(), //
[&](const sem::AbstractFloat*) { return f(cs->template As<AFloat>()...); },
[&](const sem::F32*) { return f(cs->template As<f32>()...); },
[&](const sem::F16*) { return f(cs->template As<f16>()...); });
}
/// ZeroTypeDispatch is a helper for calling the function `f`, passing a single zero-value argument
/// of the C++ type that corresponds to the sem::Type `type`. For example, calling
/// `ZeroTypeDispatch()` with a type of `sem::I32*` will call the function f with a single argument
/// of `i32(0)`.
/// @returns the value returned by calling `f`.
/// @note `type` must be a scalar or abstract numeric type. Other types will not call `f`, and will
/// return the zero-initialized value of the return type for `f`.
template <typename F>
auto ZeroTypeDispatch(const sem::Type* type, F&& f) {
return Switch(
type, //
[&](const sem::AbstractInt*) { return f(AInt(0)); }, //
[&](const sem::AbstractFloat*) { return f(AFloat(0)); }, //
[&](const sem::I32*) { return f(i32(0)); }, //
[&](const sem::U32*) { return f(u32(0)); }, //
[&](const sem::F32*) { return f(f32(0)); }, //
[&](const sem::F16*) { return f(f16(0)); }, //
[&](const sem::Bool*) { return f(static_cast<bool>(0)); });
}
/// @returns `value` if `T` is not a Number, otherwise ValueOf returns the inner value of the
/// Number.
template <typename T>
inline auto ValueOf(T value) {
if constexpr (std::is_same_v<UnwrapNumber<T>, T>) {
return value;
} else {
return value.value;
}
}
/// @returns true if `value` is a positive zero.
template <typename T>
inline bool IsPositiveZero(T value) {
using N = UnwrapNumber<T>;
return Number<N>(value) == Number<N>(0); // Considers sign bit
}
/// Constant inherits from sem::Constant to add an private implementation method for conversion.
struct Constant : public sem::Constant {
/// Convert attempts to convert the constant value to the given type. On error, Convert()
/// creates a new diagnostic message and returns a Failure.
virtual utils::Result<const Constant*> Convert(ProgramBuilder& builder,
const sem::Type* target_ty,
const Source& source) const = 0;
};
// Forward declaration
const Constant* CreateComposite(ProgramBuilder& builder,
const sem::Type* type,
utils::VectorRef<const sem::Constant*> elements);
/// Element holds a single scalar or abstract-numeric value.
/// Element implements the Constant interface.
template <typename T>
struct Element : Constant {
static_assert(!std::is_same_v<UnwrapNumber<T>, T> || std::is_same_v<T, bool>,
"T must be a Number or bool");
Element(const sem::Type* t, T v) : type(t), value(v) {}
~Element() override = default;
const sem::Type* Type() const override { return type; }
std::variant<std::monostate, AInt, AFloat> Value() const override {
if constexpr (IsFloatingPoint<UnwrapNumber<T>>) {
return static_cast<AFloat>(value);
} else {
return static_cast<AInt>(value);
}
}
const sem::Constant* Index(size_t) const override { return nullptr; }
bool AllZero() const override { return IsPositiveZero(value); }
bool AnyZero() const override { return IsPositiveZero(value); }
bool AllEqual() const override { return true; }
size_t Hash() const override { return utils::Hash(type, ValueOf(value)); }
utils::Result<const Constant*> Convert(ProgramBuilder& builder,
const sem::Type* target_ty,
const Source& source) const override {
TINT_BEGIN_DISABLE_WARNING(UNREACHABLE_CODE);
if (target_ty == type) {
// If the types are identical, then no conversion is needed.
return this;
}
bool failed = false;
auto* res = ZeroTypeDispatch(target_ty, [&](auto zero_to) -> const Constant* {
// `T` is the source type, `value` is the source value.
// `TO` is the target type.
using TO = std::decay_t<decltype(zero_to)>;
if constexpr (std::is_same_v<TO, bool>) {
// [x -> bool]
return builder.create<Element<TO>>(target_ty, !IsPositiveZero(value));
} else if constexpr (std::is_same_v<T, bool>) {
// [bool -> x]
return builder.create<Element<TO>>(target_ty, TO(value ? 1 : 0));
} else if (auto conv = CheckedConvert<TO>(value)) {
// Conversion success
return builder.create<Element<TO>>(target_ty, conv.Get());
// --- Below this point are the failure cases ---
} else if constexpr (std::is_same_v<T, AInt> || std::is_same_v<T, AFloat>) {
// [abstract-numeric -> x] - materialization failure
std::stringstream ss;
ss << "value " << value << " cannot be represented as ";
ss << "'" << builder.FriendlyName(target_ty) << "'";
builder.Diagnostics().add_error(tint::diag::System::Resolver, ss.str(), source);
failed = true;
} else if constexpr (IsFloatingPoint<UnwrapNumber<TO>>) {
// [x -> floating-point] - number not exactly representable
// https://www.w3.org/TR/WGSL/#floating-point-conversion
switch (conv.Failure()) {
case ConversionFailure::kExceedsNegativeLimit:
return builder.create<Element<TO>>(target_ty, -TO::Inf());
case ConversionFailure::kExceedsPositiveLimit:
return builder.create<Element<TO>>(target_ty, TO::Inf());
}
} else {
// [x -> integer] - number not exactly representable
// https://www.w3.org/TR/WGSL/#floating-point-conversion
switch (conv.Failure()) {
case ConversionFailure::kExceedsNegativeLimit:
return builder.create<Element<TO>>(target_ty, TO::Lowest());
case ConversionFailure::kExceedsPositiveLimit:
return builder.create<Element<TO>>(target_ty, TO::Highest());
}
}
return nullptr; // Expression is not constant.
});
if (failed) {
// A diagnostic error has been raised, and resolving should abort.
return utils::Failure;
}
return res;
TINT_END_DISABLE_WARNING(UNREACHABLE_CODE);
}
sem::Type const* const type;
const T value;
};
/// Splat holds a single Constant value, duplicated as all children.
/// Splat is used for zero-initializers, 'splat' constructors, or constructors where each element is
/// identical. Splat may be of a vector, matrix or array type.
/// Splat implements the Constant interface.
struct Splat : Constant {
Splat(const sem::Type* t, const sem::Constant* e, size_t n) : type(t), el(e), count(n) {}
~Splat() override = default;
const sem::Type* Type() const override { return type; }
std::variant<std::monostate, AInt, AFloat> Value() const override { return {}; }
const sem::Constant* Index(size_t i) const override { return i < count ? el : nullptr; }
bool AllZero() const override { return el->AllZero(); }
bool AnyZero() const override { return el->AnyZero(); }
bool AllEqual() const override { return true; }
size_t Hash() const override { return utils::Hash(type, el->Hash(), count); }
utils::Result<const Constant*> Convert(ProgramBuilder& builder,
const sem::Type* target_ty,
const Source& source) const override {
// Convert the single splatted element type.
// Note: This file is the only place where `sem::Constant`s are created, so this static_cast
// is safe.
auto conv_el = static_cast<const Constant*>(el)->Convert(
builder, sem::Type::ElementOf(target_ty), source);
if (!conv_el) {
return utils::Failure;
}
if (!conv_el.Get()) {
return nullptr;
}
return builder.create<Splat>(target_ty, conv_el.Get(), count);
}
sem::Type const* const type;
const sem::Constant* el;
const size_t count;
};
/// Composite holds a number of mixed child Constant values.
/// Composite may be of a vector, matrix or array type.
/// If each element is the same type and value, then a Splat would be a more efficient constant
/// implementation. Use CreateComposite() to create the appropriate Constant type.
/// Composite implements the Constant interface.
struct Composite : Constant {
Composite(const sem::Type* t,
utils::VectorRef<const sem::Constant*> els,
bool all_0,
bool any_0)
: type(t), elements(std::move(els)), all_zero(all_0), any_zero(any_0), hash(CalcHash()) {}
~Composite() override = default;
const sem::Type* Type() const override { return type; }
std::variant<std::monostate, AInt, AFloat> Value() const override { return {}; }
const sem::Constant* Index(size_t i) const override {
return i < elements.Length() ? elements[i] : nullptr;
}
bool AllZero() const override { return all_zero; }
bool AnyZero() const override { return any_zero; }
bool AllEqual() const override { return false; /* otherwise this should be a Splat */ }
size_t Hash() const override { return hash; }
utils::Result<const Constant*> Convert(ProgramBuilder& builder,
const sem::Type* target_ty,
const Source& source) const override {
// Convert each of the composite element types.
auto* el_ty = sem::Type::ElementOf(target_ty);
utils::Vector<const sem::Constant*, 4> conv_els;
conv_els.Reserve(elements.Length());
for (auto* el : elements) {
// Note: This file is the only place where `sem::Constant`s are created, so this
// static_cast is safe.
auto conv_el = static_cast<const Constant*>(el)->Convert(builder, el_ty, source);
if (!conv_el) {
return utils::Failure;
}
if (!conv_el.Get()) {
return nullptr;
}
conv_els.Push(conv_el.Get());
}
return CreateComposite(builder, target_ty, std::move(conv_els));
}
size_t CalcHash() {
auto h = utils::Hash(type, all_zero, any_zero);
for (auto* el : elements) {
utils::HashCombine(&h, el->Hash());
}
return h;
}
sem::Type const* const type;
const utils::Vector<const sem::Constant*, 8> elements;
const bool all_zero;
const bool any_zero;
const size_t hash;
};
/// CreateElement constructs and returns an Element<T>.
template <typename T>
const Constant* CreateElement(ProgramBuilder& builder, const sem::Type* t, T v) {
return builder.create<Element<T>>(t, v);
}
/// ZeroValue returns a Constant for the zero-value of the type `type`.
const Constant* ZeroValue(ProgramBuilder& builder, const sem::Type* type) {
return Switch(
type, //
[&](const sem::Vector* v) -> const Constant* {
auto* zero_el = ZeroValue(builder, v->type());
return builder.create<Splat>(type, zero_el, v->Width());
},
[&](const sem::Matrix* m) -> const Constant* {
auto* zero_el = ZeroValue(builder, m->ColumnType());
return builder.create<Splat>(type, zero_el, m->columns());
},
[&](const sem::Array* a) -> const Constant* {
if (auto* zero_el = ZeroValue(builder, a->ElemType())) {
return builder.create<Splat>(type, zero_el, a->Count());
}
return nullptr;
},
[&](const sem::Struct* s) -> const Constant* {
std::unordered_map<const sem::Type*, const Constant*> zero_by_type;
utils::Vector<const sem::Constant*, 4> zeros;
zeros.Reserve(s->Members().size());
for (auto* member : s->Members()) {
auto* zero = utils::GetOrCreate(zero_by_type, member->Type(),
[&] { return ZeroValue(builder, member->Type()); });
if (!zero) {
return nullptr;
}
zeros.Push(zero);
}
if (zero_by_type.size() == 1) {
// All members were of the same type, so the zero value is the same for all members.
return builder.create<Splat>(type, zeros[0], s->Members().size());
}
return CreateComposite(builder, s, std::move(zeros));
},
[&](Default) -> const Constant* {
return ZeroTypeDispatch(type, [&](auto zero) -> const Constant* {
return CreateElement(builder, type, zero);
});
});
}
/// Equal returns true if the constants `a` and `b` are of the same type and value.
bool Equal(const sem::Constant* a, const sem::Constant* b) {
if (a->Hash() != b->Hash()) {
return false;
}
if (a->Type() != b->Type()) {
return false;
}
return Switch(
a->Type(), //
[&](const sem::Vector* vec) {
for (size_t i = 0; i < vec->Width(); i++) {
if (!Equal(a->Index(i), b->Index(i))) {
return false;
}
}
return true;
},
[&](const sem::Matrix* mat) {
for (size_t i = 0; i < mat->columns(); i++) {
if (!Equal(a->Index(i), b->Index(i))) {
return false;
}
}
return true;
},
[&](const sem::Array* arr) {
for (size_t i = 0; i < arr->Count(); i++) {
if (!Equal(a->Index(i), b->Index(i))) {
return false;
}
}
return true;
},
[&](Default) { return a->Value() == b->Value(); });
}
/// CreateComposite is used to construct a constant of a vector, matrix or array type.
/// CreateComposite examines the element values and will return either a Composite or a Splat,
/// depending on the element types and values.
const Constant* CreateComposite(ProgramBuilder& builder,
const sem::Type* type,
utils::VectorRef<const sem::Constant*> elements) {
if (elements.IsEmpty()) {
return nullptr;
}
bool any_zero = false;
bool all_zero = true;
bool all_equal = true;
auto* first = elements.Front();
for (auto* el : elements) {
if (!el) {
return nullptr;
}
if (!any_zero && el->AnyZero()) {
any_zero = true;
}
if (all_zero && !el->AllZero()) {
all_zero = false;
}
if (all_equal && el != first) {
if (!Equal(el, first)) {
all_equal = false;
}
}
}
if (all_equal) {
return builder.create<Splat>(type, elements[0], elements.Length());
} else {
return builder.create<Composite>(type, std::move(elements), all_zero, any_zero);
}
}
/// TransformElements constructs a new constant by applying the transformation function 'f' on each
/// of the most deeply nested elements of 'cs'.
template <typename F, typename... CONSTANTS>
const Constant* TransformElements(ProgramBuilder& builder, F&& f, CONSTANTS&&... cs) {
uint32_t n = 0;
auto* ty = First(cs...)->Type();
auto* el_ty = sem::Type::ElementOf(ty, &n);
if (el_ty == ty) {
return f(cs...);
}
utils::Vector<const sem::Constant*, 8> els;
els.Reserve(n);
for (uint32_t i = 0; i < n; i++) {
els.Push(TransformElements(builder, f, cs->Index(i)...));
}
return CreateComposite(builder, ty, std::move(els));
}
} // namespace
ConstEval::ConstEval(ProgramBuilder& b) : builder(b) {}
const sem::Constant* ConstEval::Literal(const sem::Type* ty,
const ast::LiteralExpression* literal) {
return Switch(
literal,
[&](const ast::BoolLiteralExpression* lit) {
return CreateElement(builder, ty, lit->value);
},
[&](const ast::IntLiteralExpression* lit) -> const Constant* {
switch (lit->suffix) {
case ast::IntLiteralExpression::Suffix::kNone:
return CreateElement(builder, ty, AInt(lit->value));
case ast::IntLiteralExpression::Suffix::kI:
return CreateElement(builder, ty, i32(lit->value));
case ast::IntLiteralExpression::Suffix::kU:
return CreateElement(builder, ty, u32(lit->value));
}
return nullptr;
},
[&](const ast::FloatLiteralExpression* lit) -> const Constant* {
switch (lit->suffix) {
case ast::FloatLiteralExpression::Suffix::kNone:
return CreateElement(builder, ty, AFloat(lit->value));
case ast::FloatLiteralExpression::Suffix::kF:
return CreateElement(builder, ty, f32(lit->value));
case ast::FloatLiteralExpression::Suffix::kH:
return CreateElement(builder, ty, f16(lit->value));
}
return nullptr;
});
}
const sem::Constant* ConstEval::ArrayOrStructCtor(
const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
if (args.IsEmpty()) {
return ZeroValue(builder, ty);
}
if (args.Length() == 1 && args[0]->Type() == ty) {
// Identity constructor.
return args[0]->ConstantValue();
}
// Multiple arguments. Must be a type constructor.
utils::Vector<const sem::Constant*, 4> els;
els.Reserve(args.Length());
for (auto* arg : args) {
els.Push(arg->ConstantValue());
}
return CreateComposite(builder, ty, std::move(els));
}
const sem::Constant* ConstEval::Conv(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
uint32_t el_count = 0;
auto* el_ty = sem::Type::ElementOf(ty, &el_count);
if (!el_ty) {
return nullptr;
}
auto& src = args[0]->Declaration()->source;
auto* arg = args[0]->ConstantValue();
if (!arg) {
return nullptr; // Single argument is not constant.
}
if (auto conv = Convert(ty, arg, src)) {
return conv.Get();
}
return nullptr;
}
const sem::Constant* ConstEval::Zero(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*>) {
return ZeroValue(builder, ty);
}
const sem::Constant* ConstEval::Identity(const sem::Type*,
utils::ConstVectorRef<const sem::Expression*> args) {
return args[0]->ConstantValue();
}
const sem::Constant* ConstEval::VecSplat(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
if (auto* arg = args[0]->ConstantValue()) {
return builder.create<Splat>(ty, arg, static_cast<const sem::Vector*>(ty)->Width());
}
return nullptr;
}
const sem::Constant* ConstEval::VecCtorS(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
utils::Vector<const sem::Constant*, 4> els;
for (auto* arg : args) {
els.Push(arg->ConstantValue());
}
return CreateComposite(builder, ty, std::move(els));
}
const sem::Constant* ConstEval::VecCtorM(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
utils::Vector<const sem::Constant*, 4> els;
for (auto* arg : args) {
auto* val = arg->ConstantValue();
if (!val) {
return nullptr;
}
auto* arg_ty = arg->Type();
if (auto* arg_vec = arg_ty->As<sem::Vector>()) {
// Extract out vector elements.
for (uint32_t j = 0; j < arg_vec->Width(); j++) {
auto* el = val->Index(j);
if (!el) {
return nullptr;
}
els.Push(el);
}
} else {
els.Push(val);
}
}
return CreateComposite(builder, ty, std::move(els));
}
const sem::Constant* ConstEval::MatCtorS(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
auto* m = static_cast<const sem::Matrix*>(ty);
utils::Vector<const sem::Constant*, 4> els;
for (uint32_t c = 0; c < m->columns(); c++) {
utils::Vector<const sem::Constant*, 4> column;
for (uint32_t r = 0; r < m->rows(); r++) {
auto i = r + c * m->rows();
column.Push(args[i]->ConstantValue());
}
els.Push(CreateComposite(builder, m->ColumnType(), std::move(column)));
}
return CreateComposite(builder, ty, std::move(els));
}
const sem::Constant* ConstEval::MatCtorV(const sem::Type* ty,
utils::ConstVectorRef<const sem::Expression*> args) {
utils::Vector<const sem::Constant*, 4> els;
for (auto* arg : args) {
els.Push(arg->ConstantValue());
}
return CreateComposite(builder, ty, std::move(els));
}
const sem::Constant* ConstEval::Index(const sem::Expression* obj_expr,
const sem::Expression* idx_expr) {
auto obj_val = obj_expr->ConstantValue();
if (!obj_val) {
return {};
}
auto idx_val = idx_expr->ConstantValue();
if (!idx_val) {
return {};
}
uint32_t el_count = 0;
sem::Type::ElementOf(obj_val->Type(), &el_count);
AInt idx = idx_val->As<AInt>();
if (idx < 0 || idx >= el_count) {
auto clamped = std::min<AInt::type>(std::max<AInt::type>(idx, 0), el_count - 1);
AddWarning("index " + std::to_string(idx) + " out of bounds [0.." +
std::to_string(el_count - 1) + "]. Clamping index to " +
std::to_string(clamped),
idx_expr->Declaration()->source);
idx = clamped;
}
return obj_val->Index(static_cast<size_t>(idx));
}
const sem::Constant* ConstEval::MemberAccess(const sem::Expression* obj_expr,
const sem::StructMember* member) {
auto obj_val = obj_expr->ConstantValue();
if (!obj_val) {
return {};
}
return obj_val->Index(static_cast<size_t>(member->Index()));
}
const sem::Constant* ConstEval::Swizzle(const sem::Type* ty,
const sem::Expression* vec_expr,
utils::ConstVectorRef<uint32_t> indices) {
auto* vec_val = vec_expr->ConstantValue();
if (!vec_val) {
return nullptr;
}
if (indices.Length() == 1) {
return vec_val->Index(static_cast<size_t>(indices[0]));
} else {
auto values = utils::Transform<4>(
indices, [&](uint32_t i) { return vec_val->Index(static_cast<size_t>(i)); });
return CreateComposite(builder, ty, std::move(values));
}
}
const sem::Constant* ConstEval::Bitcast(const sem::Type*, const sem::Expression*) {
// TODO(crbug.com/tint/1581): Implement @const intrinsics
return nullptr;
}
const sem::Constant* ConstEval::OpComplement(const sem::Type*,
utils::ConstVectorRef<const sem::Expression*> args) {
auto transform = [&](const sem::Constant* c) {
auto create = [&](auto i) {
return CreateElement(builder, c->Type(), decltype(i)(~i.value));
};
return Dispatch_ia_iu32(create, c);
};
return TransformElements(builder, transform, args[0]->ConstantValue());
}
const sem::Constant* ConstEval::OpMinus(const sem::Type*,
utils::ConstVectorRef<const sem::Expression*> args) {
auto transform = [&](const sem::Constant* c) {
auto create = [&](auto i) { //
// For signed integrals, avoid C++ UB by not negating the
// smallest negative number. In WGSL, this operation is well
// defined to return the same value, see:
// https://gpuweb.github.io/gpuweb/wgsl/#arithmetic-expr.
using T = UnwrapNumber<decltype(i)>;
if constexpr (std::is_integral_v<T>) {
auto v = i.value;
if (v != std::numeric_limits<T>::min()) {
v = -v;
}
return CreateElement(builder, c->Type(), decltype(i)(v));
} else {
return CreateElement(builder, c->Type(), decltype(i)(-i.value));
}
};
return Dispatch_fia_fi32_f16(create, c);
};
return TransformElements(builder, transform, args[0]->ConstantValue());
}
const sem::Constant* ConstEval::atan2(const sem::Type*,
utils::ConstVectorRef<const sem::Expression*> args) {
auto transform = [&](const sem::Constant* c0, const sem::Constant* c1) {
auto create = [&](auto i, auto j) {
return CreateElement(builder, c0->Type(), decltype(i)(std::atan2(i.value, j.value)));
};
return Dispatch_fa_f32_f16(create, c0, c1);
};
return TransformElements(builder, transform, args[0]->ConstantValue(),
args[1]->ConstantValue());
}
const sem::Constant* ConstEval::clamp(const sem::Type*,
utils::ConstVectorRef<const sem::Expression*> args) {
auto transform = [&](const sem::Constant* c0, const sem::Constant* c1,
const sem::Constant* c2) {
auto create = [&](auto e, auto low, auto high) {
return CreateElement(builder, c0->Type(),
decltype(e)(std::min(std::max(e, low), high)));
};
return Dispatch_fia_fiu32_f16(create, c0, c1, c2);
};
return TransformElements(builder, transform, args[0]->ConstantValue(), args[1]->ConstantValue(),
args[2]->ConstantValue());
}
utils::Result<const sem::Constant*> ConstEval::Convert(const sem::Type* target_ty,
const sem::Constant* value,
const Source& source) {
if (value->Type() == target_ty) {
return value;
}
auto conv = static_cast<const Constant*>(value)->Convert(builder, target_ty, source);
if (!conv) {
return utils::Failure;
}
return conv.Get();
}
void ConstEval::AddError(const std::string& msg, const Source& source) const {
builder.Diagnostics().add_error(diag::System::Resolver, msg, source);
}
void ConstEval::AddWarning(const std::string& msg, const Source& source) const {
builder.Diagnostics().add_warning(diag::System::Resolver, msg, source);
}
} // namespace tint::resolver
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