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runtime: use AES hash for compound objects.

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7716047
This commit is contained in:
Keith Randall 2013-03-15 10:46:34 -07:00
parent a5b2623dab
commit 6b57329268
1 changed files with 7 additions and 0 deletions
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7
src/pkg/runtime/alg.c
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@ -8,6 +8,8 @@
#define M0 (sizeof(uintptr)==4 ? 2860486313UL : 33054211828000289ULL)
#define M1 (sizeof(uintptr)==4 ? 3267000013UL : 23344194077549503ULL)
static bool use_aeshash;
/*
* map and chan helpers for
* dealing with unknown types
@ -17,6 +19,10 @@ runtime·memhash(uintptr *h, uintptr s, void *a)
{
byte *b;
uintptr hash;
if(use_aeshash) {
runtime·aeshash(h, s, a);
return;
}
b = a;
hash = M0 ^ *h;
@ -479,6 +485,7 @@ runtime·hashinit(void)
(runtime·cpuid_ecx & (1 << 19)) != 0) { // sse4.1 (pinsr{d,q})
byte *rnd;
int32 n;
use_aeshash = true;
runtime·algarray[AMEM].hash = runtime·aeshash;
runtime·algarray[AMEM8].hash = runtime·aeshash;
runtime·algarray[AMEM16].hash = runtime·aeshash;