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Merge pull request #395 from gmpy/improve-write-performance

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lfs_bd_cmp() compares more bytes at one time
This commit is contained in:
Christopher Haster
2020-12-03 22:34:47 -06:00
committed by GitHub
parent e273a82679 64f70f51b0
commit 66272067ab
1 changed files with 12 additions and 8 deletions
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20
lfs.c
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@@ -118,18 +118,22 @@ static int lfs_bd_cmp(lfs_t *lfs,
lfs_block_t block, lfs_off_t off, lfs_block_t block, lfs_off_t off,
const void *buffer, lfs_size_t size) { const void *buffer, lfs_size_t size) {
const uint8_t *data = buffer; const uint8_t *data = buffer;
lfs_size_t diff = 0;
for (lfs_off_t i = 0; i < size; i++) { for (lfs_off_t i = 0; i < size; i += diff) {
uint8_t dat; uint8_t dat[8];
int err = lfs_bd_read(lfs,
diff = lfs_min(size-i, sizeof(dat));
int res = lfs_bd_read(lfs,
pcache, rcache, hint-i, pcache, rcache, hint-i,
block, off+i, &dat, 1); block, off+i, &dat, diff);
if (err) { if (res) {
return err; return res;
} }
if (dat != data[i]) { res = memcmp(dat, data + i, diff);
return (dat < data[i]) ? LFS_CMP_LT : LFS_CMP_GT; if (res) {
return res < 0 ? LFS_CMP_LT : LFS_CMP_GT;
} }
} }