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Cache frequently used indirectly referenced variables in the sliding mmap code.

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Con Kolivas 2013-03-19 00:17:52 +11:00
parent 87fe625829
commit 2c1dda7b73
1 changed files with 17 additions and 8 deletions
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25
rzip.c
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@ -173,14 +173,18 @@ static inline bool remap_high_sb(rzip_control *control, struct sliding_buffer *s
static uchar *sliding_get_sb(rzip_control *control, i64 p)
{
struct sliding_buffer *sb = &control->sb;
i64 sbo;
if (p >= sb->offset_low && p < sb->offset_low + sb->size_low)
return (sb->buf_low + p - sb->offset_low);
if (p >= sb->offset_high && p < (sb->offset_high + sb->size_high))
return (sb->buf_high + (p - sb->offset_high));
sbo = sb->offset_low;
if (p >= sbo && p < sbo + sb->size_low)
return (sb->buf_low + p - sbo);
sbo = sb->offset_high;
if (p >= sbo && p < (sbo + sb->size_high))
return (sb->buf_high + (p - sbo));
/* p is not within the low or high buffer range */
if (unlikely(!remap_high_sb(control, &control->sb, p)))
return NULL;
/* Use sb->offset_high directly since it will have changed */
return (sb->buf_high + (p - sb->offset_high));
}
@ -195,11 +199,16 @@ static uchar *single_get_sb(__maybe_unused rzip_control *control, i64 p)
static inline i64 sliding_get_sb_range(rzip_control *control, i64 p)
{
struct sliding_buffer *sb = &control->sb;
i64 sbo, sbs;
if (p >= sb->offset_low && p < sb->offset_low + sb->size_low)
return (sb->size_low - (p - sb->offset_low));
if (likely(p >= sb->offset_high && p < (sb->offset_high + sb->size_high)))
return (sb->size_high - (p - sb->offset_high));
sbo = sb->offset_low;
sbs = sb->size_low;
if (p >= sbo && p < sbo + sbs)
return (sbs - (p - sbo));
sbo = sb->offset_high;
sbs = sb->size_high;
if (likely(p >= sbo && p < (sbo + sbs)))
return (sbs - (p - sbo));
fatal_return(("sliding_get_sb_range: the pointer is out of range\n"), 0);
}