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pass_phiprop.go
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/
pass_phiprop.go
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/*
* Copyright 2022 ByteDance Inc.
*
* 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.
*/
package ssa
// PhiProp propagates Phi nodes into it's source blocks,
// essentially get rid of them.
// The CFG is no longer in SSA form after this pass.
type PhiProp struct{}
func (PhiProp) Apply(cfg *CFG) {
cfg.PostOrder().ForEach(func(bb *BasicBlock) {
vv := bb.Phi
bb.Phi = nil
/* process each Phi node */
for _, p := range vv {
for b, r := range p.V {
b.Ins = append(b.Ins, IrArchCopy(p.R, *r))
}
}
})
}