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go/test/fixedbugs/bug401.go
Russ Cox ee9bfb023a gc: fix order of evaluation
Pulling function calls out to happen before the
expression being evaluated was causing illegal
reorderings even without inlining; with inlining
it got worse.  This CL adds a separate ordering pass
to move things with a fixed order out of expressions
and into the statement sequence, where they will
not be reordered by walk.

Replaces lvd's CL 5534079.

Fixes #2740.

R=lvd
CC=golang-dev
https://golang.org/cl/5569062
2012-01-25 17:53:50 -05:00

47 lines
810 B
Go

// $G $D/$F.go && $L $F.$A && ./$A.out || echo "Bug401"
// Copyright 2011 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.
// Issue 2582
package main
type T struct{}
func (T) cplx() complex128 {
for false {
} // avoid inlining
return complex(1, 0)
}
func (T) cplx2() complex128 {
return complex(0, 1)
}
type I interface {
cplx() complex128
}
func main() {
var t T
if v := real(t.cplx()); v != 1 {
panic("not-inlined complex call failed")
}
_ = imag(t.cplx())
_ = real(t.cplx2())
if v := imag(t.cplx2()); v != 1 {
panic("potentially inlined complex call failed")
}
var i I
i = t
if v := real(i.cplx()); v != 1 {
panic("potentially inlined complex call failed")
}
_ = imag(i.cplx())
}