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gopack: work around gcc bug in hash function

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Fixes #48.  (this time for sure!)

R=r, r1
https://golang.org/cl/152088
This commit is contained in:
Russ Cox 2009-11-11 22:19:58 -08:00
parent 0c83f23d44
commit 8b95720918
1 changed files with 10 additions and 3 deletions
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13
src/cmd/gopack/ar.c
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@ -784,9 +784,16 @@ hashstr(char *name)
h = 0;
for(cp = name; *cp; h += *cp++)
h *= 1119;
if(h < 0)
h = ~h;
return h;
// the code used to say
// if(h < 0)
// h = ~h;
// but on gcc 4.3 with -O2 on some systems,
// the if(h < 0) gets compiled away as not possible.
// use a mask instead, leaving plenty of bits but
// definitely not the sign bit.
return h & 0xfffffff;
}
int