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runtime: fix float64 hash on 32-bit machine

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Multiplying by the low 32 bits was a bad idea
no matter what, but it was a particularly unfortunate
choice because those bits are 0 for small integer values.

Fixes #2883.

R=ken2
CC=golang-dev
https://golang.org/cl/5634047
This commit is contained in:
Russ Cox 2012-02-06 11:24:34 -05:00
parent 48bd13911d
commit facee93a86
1 changed files with 1 additions and 1 deletions
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2
src/pkg/runtime/alg.c
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@ -271,7 +271,7 @@ runtime·f64hash(uintptr *h, uintptr s, void *a)
else {
u = *(uint64*)a;
if(sizeof(uintptr) == 4)
hash = ((uint32)(u>>32) ^ 2860486313) * (uint32)u;
hash = ((uint32)(u>>32) * 3267000013UL) ^ (uint32)u;
else
hash = u;
}