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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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 <cassert>
#include <cmath>
#include <limits>
#include "support/safe_integer.h"
using namespace wasm;
bool wasm::isInteger(double x) { return fmod(x, 1) == 0; }
bool wasm::isUInteger32(double x) {
return !std::signbit(x) && isInteger(x) &&
x <= std::numeric_limits<uint32_t>::max();
}
bool wasm::isSInteger32(double x) {
return isInteger(x) && x >= std::numeric_limits<int32_t>::min() &&
x <= std::numeric_limits<int32_t>::max();
}
uint32_t wasm::toUInteger32(double x) {
return std::signbit(x) ? 0 : (x < std::numeric_limits<uint32_t>::max()
? x
: std::numeric_limits<uint32_t>::max());
}
int32_t wasm::toSInteger32(double x) {
return (x > std::numeric_limits<int32_t>::min() &&
x < std::numeric_limits<int32_t>::max())
? x
: (std::signbit(x) ? std::numeric_limits<int32_t>::min()
: std::numeric_limits<int32_t>::max());
}
bool wasm::isUInteger64(double x) {
return !std::signbit(x) && isInteger(x) &&
x <= std::numeric_limits<uint64_t>::max();
}
bool wasm::isSInteger64(double x) {
return isInteger(x) && x >= std::numeric_limits<int64_t>::min() &&
x <= std::numeric_limits<int64_t>::max();
}
uint64_t wasm::toUInteger64(double x) {
return std::signbit(x) ? 0 : (x < (double)std::numeric_limits<uint64_t>::max()
? (uint64_t)x
: std::numeric_limits<uint64_t>::max());
}
int64_t wasm::toSInteger64(double x) {
return (x > (double)std::numeric_limits<int64_t>::min() &&
x < (double)std::numeric_limits<int64_t>::max())
? (int64_t)x
: (std::signbit(x) ? std::numeric_limits<int64_t>::min()
: std::numeric_limits<int64_t>::max());
}
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