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[core] perf: buffer_align_size() identity if align 

use identity if requested size is already aligned to BUFFER_PIECE_SIZE
This commit is contained in:
Glenn Strauss 2018-10-26 21:57:25 -04:00
parent 929909a999
commit 2e23b43d12
1 changed files with 4 additions and 5 deletions
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9
src/buffer.c
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@ -77,12 +77,11 @@ void buffer_move(buffer *b, buffer *src) {
tmp = *src; *src = *b; *b = tmp;
}
#define BUFFER_PIECE_SIZE 64
#define BUFFER_PIECE_SIZE 64uL /*(must be power-of-2)*/
static size_t buffer_align_size(size_t size) {
size_t align = BUFFER_PIECE_SIZE - (size % BUFFER_PIECE_SIZE);
/* overflow on unsinged size_t is defined to wrap around */
if (size + align < size) return size;
return size + align;
size_t aligned = (size + BUFFER_PIECE_SIZE-1) & ~(BUFFER_PIECE_SIZE-1);
force_assert(aligned >= size);
return aligned;
}
/* make sure buffer is at least "size" big. discard old data */