blob: 638977353f3e347444b9e3d4641b9e6e5191cdae (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
/*
* 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.
*/
//
// Optimize combinations of instructions
//
#include <algorithm>
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct OptimizeInstructions : public WalkerPass<WasmWalker<OptimizeInstructions>> {
void visitIf(If* curr) {
// flip branches to get rid of an i32.eqz
if (curr->ifFalse) {
auto condition = curr->condition->dyn_cast<Unary>();
if (condition && condition->op == EqZ && condition->value->type == i32) {
curr->condition = condition->value;
std::swap(curr->ifTrue, curr->ifFalse);
}
}
}
};
static RegisterPass<OptimizeInstructions> registerPass("optimize-instructions", "optimizes instruction combinations");
} // namespace wasm
|
