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faster path for common size

This commit is contained in:
Lev Walkin 2004-06-14 08:17:27 +00:00
parent 46bf935e1e
commit c4c6196c40
2 changed files with 28 additions and 7 deletions
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30
skeletons/OBJECT_IDENTIFIER.c
View File

@ -91,6 +91,7 @@ OBJECT_IDENTIFIER_constraint(asn1_TYPE_descriptor_t *td, const void *sptr,
return 0;
}
int
OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed int add, void *rvbuf, unsigned int rvsize) {
unsigned LE = 1; /* Little endian (x86) */
@ -130,23 +131,39 @@ OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed in
}
}
/* Faster path for common size */
if(rvsize == (CHAR_BIT * sizeof(unsigned long))) {
unsigned long accum;
/* Gather all bits into the accumulator */
for(accum = cache; arcbuf < arcend; arcbuf++)
accum = (accum << 7) | (*arcbuf & ~0x80);
if(accum < (unsigned)-add) {
errno = ERANGE; /* Overflow */
return -1;
}
*(unsigned long *)rvbuf = accum + add;
return 0;
}
#ifndef WORDS_BIGENDIAN
if(*(unsigned char *)&LE) { /* Little endian (x86) */
/* "Convert" to big endian */
rvbuf += rvsize / CHAR_BIT;
rvbuf += rvsize / CHAR_BIT - 1;
((unsigned char *)rvstart)--;
inc = -1; /* Descending */
} else {
inc = +1; /* Ascending */
}
} else
#endif /* !WORDS_BIGENDIAN */
inc = +1; /* Big endian is known [at compile time] */
{ /* Native big endian (Sparc, PPC) */
{
unsigned int bits; /* typically no more than 3-4 bits */
/* Clear the high unused bits */
for(bits = rvsize - arclen;
bits > CHAR_BIT;
rvbuf += inc, bits -= CHAR_BIT)
*(unsigned char *)rvbuf = 0;
/* Fill the body of a value */
for(; arcbuf < arcend; arcbuf++) {
cache = (cache << 7) | (*arcbuf & 0x7f);
@ -323,8 +340,8 @@ OBJECT_IDENTIFIER_set_arcs_l(OBJECT_IDENTIFIER_t *oid, unsigned long *arcs, unsi
uint8_t *buf;
uint8_t *bp;
unsigned long long first_value;
unsigned i;
int size;
int i;
if(oid == NULL || arcs == NULL || arc_slots < 2) {
errno = EINVAL;
@ -423,3 +440,4 @@ OBJECT_IDENTIFIER_set_arcs_l(OBJECT_IDENTIFIER_t *oid, unsigned long *arcs, unsi
return 0;
}

5
skeletons/tests/check-OIDs.c
View File

@ -269,7 +269,10 @@ main() {
CHECK_REGEN_OID(12);
CHECK_REGEN_OID(13);
check_speed();
if(getenv("CHECK_SPEED")) {
/* Useful for developers only */
check_speed();
}
return 0;
}