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/*
* Copyright 2015 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.
*/
//
// Misc optimizations that are useful for and/or are only valid for
// emscripten output.
//
#include <asmjs/shared-constants.h>
#include <ir/localize.h>
#include <pass.h>
#include <wasm-builder.h>
#include <wasm.h>
namespace wasm {
struct PostEmscripten : public WalkerPass<PostWalker<PostEmscripten>> {
bool isFunctionParallel() override { return true; }
Pass* create() override { return new PostEmscripten; }
void visitCall(Call* curr) {
// special asm.js imports can be optimized
auto* func = getModule()->getFunction(curr->target);
if (!func->imported()) {
return;
}
if (func->module == GLOBAL_MATH) {
if (func->base == POW) {
if (auto* exponent = curr->operands[1]->dynCast<Const>()) {
if (exponent->value == Literal(double(2.0))) {
// This is just a square operation, do a multiply
Localizer localizer(curr->operands[0], getFunction(), getModule());
Builder builder(*getModule());
replaceCurrent(builder.makeBinary(
MulFloat64,
localizer.expr,
builder.makeLocalGet(localizer.index, localizer.expr->type)));
} else if (exponent->value == Literal(double(0.5))) {
// This is just a square root operation
replaceCurrent(
Builder(*getModule()).makeUnary(SqrtFloat64, curr->operands[0]));
}
}
}
}
}
};
Pass* createPostEmscriptenPass() { return new PostEmscripten(); }
} // namespace wasm
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