Commit 676f9567 authored by simonmar's avatar simonmar
Browse files

[project @ 2005-10-14 13:11:21 by simonmar]

StrHash doesn't appear to be used; remove it.  I think it was an
earlier version of the string hashing code in Hash.c.
parent 1c7854b5
......@@ -23,7 +23,6 @@
#include "ProfHeap.h"
#include "Stats.h"
#include "Hash.h"
#include "StrHash.h"
#include "RetainerProfile.h"
#include "LdvProfile.h"
#include "Arena.h"
......
/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1994-2000
*
* Hashing functions based on:
*
* "Fast Hashing of Variable Length Text Strings"
* Peter K. Pearson, CACM June 1990
*
* They return a 32 bit value containing 16 bits of hash value.
*
* ---------------------------------------------------------------------------*/
#include "PosixSource.h"
#include "Rts.h"
#include "StrHash.h"
static const unsigned char auxTable[] = {
0x01, 0x57, 0x31, 0x0c, 0xb0, 0xb2, 0x66, 0xa6,
0x79, 0xc1, 0x06, 0x54, 0xf9, 0xe6, 0x2c, 0xa3,
0x0e, 0xc5, 0xd5, 0xb5, 0xa1, 0x55, 0xda, 0x50,
0x40, 0xef, 0x18, 0xe2, 0xec, 0x8e, 0x26, 0xc8,
0x6e, 0xb1, 0x68, 0x67, 0x8d, 0xfd, 0xff, 0x32,
0x4d, 0x65, 0x51, 0x12, 0x2d, 0x60, 0x1f, 0xde,
0x19, 0x6b, 0xbe, 0x46, 0x56, 0xed, 0xf0, 0x22,
0x48, 0xf2, 0x14, 0xd6, 0xf4, 0xe3, 0x95, 0xeb,
0x61, 0xea, 0x39, 0x16, 0x3c, 0xfa, 0x52, 0xaf,
0xd0, 0x05, 0x7f, 0xc7, 0x6f, 0x3e, 0x87, 0xf8,
0xae, 0xa9, 0xd3, 0x3a, 0x42, 0x9a, 0x6a, 0xc3,
0xf5, 0xab, 0x11, 0xbb, 0xb6, 0xb3, 0x00, 0xf3,
0x84, 0x38, 0x94, 0x4b, 0x80, 0x85, 0x9e, 0x64,
0x82, 0x7e, 0x5b, 0x0d, 0x99, 0xf6, 0xd8, 0xdb,
0x77, 0x44, 0xdf, 0x4e, 0x53, 0x58, 0xc9, 0x63,
0x7a, 0x0b, 0x5c, 0x20, 0x88, 0x72, 0x34, 0x0a,
0x8a, 0x1e, 0x30, 0xb7, 0x9c, 0x23, 0x3d, 0x1a,
0x8f, 0x4a, 0xfb, 0x5e, 0x81, 0xa2, 0x3f, 0x98,
0xaa, 0x07, 0x73, 0xa7, 0xf1, 0xce, 0x03, 0x96,
0x37, 0x3b, 0x97, 0xdc, 0x5a, 0x35, 0x17, 0x83,
0x7d, 0xad, 0x0f, 0xee, 0x4f, 0x5f, 0x59, 0x10,
0x69, 0x89, 0xe1, 0xe0, 0xd9, 0xa0, 0x25, 0x7b,
0x76, 0x49, 0x02, 0x9d, 0x2e, 0x74, 0x09, 0x91,
0x86, 0xe4, 0xcf, 0xd4, 0xca, 0xd7, 0x45, 0xe5,
0x1b, 0xbc, 0x43, 0x7c, 0xa8, 0xfc, 0x2a, 0x04,
0x1d, 0x6c, 0x15, 0xf7, 0x13, 0xcd, 0x27, 0xcb,
0xe9, 0x28, 0xba, 0x93, 0xc6, 0xc0, 0x9b, 0x21,
0xa4, 0xbf, 0x62, 0xcc, 0xa5, 0xb4, 0x75, 0x4c,
0x8c, 0x24, 0xd2, 0xac, 0x29, 0x36, 0x9f, 0x08,
0xb9, 0xe8, 0x71, 0xc4, 0xe7, 0x2f, 0x92, 0x78,
0x33, 0x41, 0x1c, 0x90, 0xfe, 0xdd, 0x5d, 0xbd,
0xc2, 0x8b, 0x70, 0x2b, 0x47, 0x6d, 0xb8, 0xd1};
hash_t
hash_str(char *str)
{
hash_t h1, h2;
hash_t ch = (hash_t) *(str++);
if (ch == 0) return 0;
h1 = (hash_t) auxTable[ch];
h2 = (hash_t) auxTable[ch+1];
while ( (ch = (hash_t)*(str++) ) != 0) {
h1 = (hash_t) auxTable[h1^ch];
h2 = (hash_t) auxTable[h2^ch];
}
return ( h2 << 8 | h1 );
}
hash_t
hash_fixed(char *data, nat len)
{
hash_t ch = (hash_t) *(data++);
hash_t h1 = (hash_t) auxTable[ch];
hash_t h2 = (hash_t) auxTable[ch+1];
ASSERT(len > 0);
while (--len > 0) {
ch = (hash_t) *(data++);
h1 = (hash_t) auxTable[h1^ch];
h2 = (hash_t) auxTable[h2^ch];
}
return ( h2 << 8 | h1 );
}
/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1994-2000
*
* Hashing functions based on:
*
* "Fast Hashing of Variable Length Text Strings"
* Peter K. Pearson, CACM June 1990
*
* They return a 32 bit value containing 16 bits of hash value.
*
* ---------------------------------------------------------------------------*/
typedef unsigned long hash_t;
hash_t hash_str(char *str);
hash_t hash_fixed(char *data, nat len);
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