| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package ssa |
| |
| import "fmt" |
| |
| func applyRewrite(f *Func, r func(*Value) bool) { |
| // repeat rewrites until we find no more rewrites |
| var curv *Value |
| defer func() { |
| if curv != nil { |
| fmt.Printf("panic during rewrite of %s\n", curv.LongString()) |
| // TODO(khr): print source location also |
| } |
| }() |
| for { |
| change := false |
| for _, b := range f.Blocks { |
| for _, v := range b.Values { |
| curv = v |
| if r(v) { |
| change = true |
| } |
| } |
| } |
| if !change { |
| return |
| } |
| } |
| } |
| |
| // Common functions called from rewriting rules |
| |
| func is64BitInt(t Type) bool { |
| return t.Size() == 8 && t.IsInteger() |
| } |
| |
| func is32BitInt(t Type) bool { |
| return t.Size() == 4 && t.IsInteger() |
| } |
| |
| func isPtr(t Type) bool { |
| return t.IsPtr() |
| } |
| |
| func isSigned(t Type) bool { |
| return t.IsSigned() |
| } |
| |
| func typeSize(t Type) int64 { |
| return t.Size() |
| } |