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undo 4439044

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cannot use regalloc with floating point on 386.
will redo some other way.

R=ken2
CC=golang-dev
https://golang.org/cl/4439045
This commit is contained in:
Russ Cox 2011-04-15 19:17:16 -04:00
parent bfb486875a
commit 3d36a81fcc
2 changed files with 3 additions and 66 deletions
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19
src/cmd/gc/cplx.c
View File

@ -21,7 +21,7 @@ void
complexmove(Node *f, Node *t)
{
int ft, tt;
Node n1, n2, n3, n4, t3, t4;
Node n1, n2, n3, n4;
if(debug['g']) {
dump("\ncomplexmove-f", f);
@ -54,21 +54,8 @@ complexmove(Node *f, Node *t)
subnode(&n1, &n2, f);
subnode(&n3, &n4, t);
// Copy fully into registers before doing stores,
// in case the source and destination overlap.
// Might be picking up a complex128 from one
// location on the stack and writing it 8 bytes
// (half a complex128) later, in which case the
// first write would smash the source for the second read.
regalloc(&t3, types[tt+TFLOAT64-TCOMPLEX128], N);
regalloc(&t4, types[tt+TFLOAT64-TCOMPLEX128], N);
cgen(&n1, &t3);
cgen(&n2, &t4);
cgen(&t3, &n3);
cgen(&t4, &n4);
regfree(&t3);
regfree(&t4);
cgen(&n1, &n3);
cgen(&n2, &n4);
break;
}
}

50
test/fixedbugs/bug329.go
View File

@ -1,50 +0,0 @@
// $G $D/$F.go && $L $F.$A && ./$A.out
// 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.
// Test that when moving a complex128 returned by one function
// into the argument position for another function, the right thing
// happens, even when the two positions half-overlap.
package main
type Value struct {
X interface{}
Y int
}
type Struct struct {
X complex128
}
const magic = 1+2i
func (Value) Complex(x complex128) {
if x != magic {
println(x)
panic("bad complex magic")
}
}
func f(x *byte, y, z int) complex128 {
return magic
}
func (Value) Struct(x Struct) {
if x.X != magic {
println(x.X)
panic("bad struct magic")
}
}
func f1(x *byte, y, z int) Struct {
return Struct{magic}
}
func main() {
var v Value
v.Struct(f1(nil, 0, 0)) // ok
v.Complex(f(nil, 0, 0)) // used to fail
}