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5g: fix -f()

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R=ken2
CC=golang-dev
https://golang.org/cl/5161041
This commit is contained in:
Russ Cox 2011-09-29 12:09:46 -04:00
parent f30719dc89
commit 092a211fb9
2 changed files with 28 additions and 2 deletions
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4
src/cmd/5g/cgen.c
View File

@ -213,11 +213,11 @@ cgen(Node *n, Node *res)
goto ret;
case OMINUS:
regalloc(&n1, nl->type, N);
cgen(nl, &n1);
nodconst(&n3, nl->type, 0);
regalloc(&n2, nl->type, res);
regalloc(&n1, nl->type, N);
gmove(&n3, &n2);
cgen(nl, &n1);
gins(optoas(OSUB, nl->type), &n1, &n2);
gmove(&n2, res);
regfree(&n1);

26
test/fixedbugs/bug368.go Normal file
View File

@ -0,0 +1,26 @@
// $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.
package main
// 5g bug used to set up the 0 for -f() before calling f,
// and the call to f smashed the register.
func f(n int) int {
s := 0
for i := 0; i < n; i++ {
s += i>>1
}
return s
}
func main() {
x := -f(100)
if x != -2450 {
println(x)
panic("broken")
}
}