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ALSA: Clean up 64bit division functions

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Replace the house-made div64_32() with the standard div_u64*() functions.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2009-06-05 17:40:04 +02:00
parent 3218911f83
commit 3f7440a6b7
5 changed files with 9 additions and 84 deletions
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74
include/sound/pcm.h
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@ -486,80 +486,6 @@ void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
void snd_pcm_vma_notify_data(void *client, void *data);
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
#if BITS_PER_LONG >= 64
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
*rem = *n % div;
*n /= div;
}
#elif defined(i386)
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
u_int32_t low, high;
low = *n & 0xffffffff;
high = *n >> 32;
if (high) {
u_int32_t high1 = high % div;
high /= div;
asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
*n = (u_int64_t)high << 32 | low;
} else {
*n = low / div;
*rem = low % div;
}
}
#else
static inline void divl(u_int32_t high, u_int32_t low,
u_int32_t div,
u_int32_t *q, u_int32_t *r)
{
u_int64_t n = (u_int64_t)high << 32 | low;
u_int64_t d = (u_int64_t)div << 31;
u_int32_t q1 = 0;
int c = 32;
while (n > 0xffffffffU) {
q1 <<= 1;
if (n >= d) {
n -= d;
q1 |= 1;
}
d >>= 1;
c--;
}
q1 <<= c;
if (n) {
low = n;
*q = q1 | (low / div);
*r = low % div;
} else {
*r = 0;
*q = q1;
}
return;
}
static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
u_int32_t low, high;
low = *n & 0xffffffff;
high = *n >> 32;
if (high) {
u_int32_t high1 = high % div;
u_int32_t low1 = low;
high /= div;
divl(high1, low1, div, &low, rem);
*n = (u_int64_t)high << 32 | low;
} else {
*n = low / div;
*rem = low % div;
}
}
#endif
/*
* PCM library
*/