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Rewrite twowords() to access its argument through a char pointer and not

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a short pointer.  The previous implementation seems to be in a gray zone
of the C standard, and GCC generates incorrect code for it at -O2 or
higher on some platforms.
This commit is contained in:
Dag-Erling Smørgrav 2004-07-06 09:22:18 +00:00
parent 65b2e19ef7
commit e3e2c21639
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=131693
2 changed files with 18 additions and 4 deletions
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11
lib/libalias/alias.c
View File

@ -139,9 +139,16 @@ __FBSDID("$FreeBSD$");
static __inline int
twowords(void *p)
{
u_short *s = p;
uint8_t *c = p;
return (s[0] + s[1]);
#if BYTE_ORDER == LITTLE_ENDIAN
uint16_t s1 = ((uint16_t)c[1] << 8) + (uint16_t)c[0];
uint16_t s2 = ((uint16_t)c[3] << 8) + (uint16_t)c[2];
#else
uint16_t s1 = ((uint16_t)c[0] << 8) + (uint16_t)c[1];
uint16_t s2 = ((uint16_t)c[2] << 8) + (uint16_t)c[3];
#endif
return (s1 + s2);
}
/* TCP Handling Routines

11
sys/netinet/libalias/alias.c
View File

@ -139,9 +139,16 @@ __FBSDID("$FreeBSD$");
static __inline int
twowords(void *p)
{
u_short *s = p;
uint8_t *c = p;
return (s[0] + s[1]);
#if BYTE_ORDER == LITTLE_ENDIAN
uint16_t s1 = ((uint16_t)c[1] << 8) + (uint16_t)c[0];
uint16_t s2 = ((uint16_t)c[3] << 8) + (uint16_t)c[2];
#else
uint16_t s1 = ((uint16_t)c[0] << 8) + (uint16_t)c[1];
uint16_t s2 = ((uint16_t)c[2] << 8) + (uint16_t)c[3];
#endif
return (s1 + s2);
}
/* TCP Handling Routines