| commit | 9459d9d8112fe7816022665b5016c2014bb625f3 | |
| author | Pádraig Brady <P@draigBrady.com> | |
| Thu, 22 Oct 2015 13:34:08 +0000 (22 14:34 +0100) | ||
| committer | Pádraig Brady <P@draigBrady.com> | |
| Tue, 27 Oct 2015 17:25:12 +0000 (27 17:25 +0000) | ||
| tree | 80486d9f4331e149f6e7ef7381acbac1613ffb31 | treesnapshot (tar.gz zip) |
| parent | 6796698c9945d87236ffcc939137d0919ef04931 | commitdiff |
copy,dd: simplify and optimize NUL bytes detection
* src/factor.c: Move LIKELY() definition to...
* src/system.h: ...here.
(is_nul): Reimplement with a version that doesn't
require a sentinel after the buffer, and which calls
down to (the system optimized) memcmp.
Performance analyzed at http://rusty.ozlabs.org/?p=560
* src/dd.c (alloc_obuf): Simplify the is_nul() call by
not needing to write the sentinel.
* src/copy.c (sparse_copy): Likewise.
(copy_reg): Simplify the buffer allocation by avoiding
consideration of the sentinel in the buffer size calculation.
* src/factor.c: Move LIKELY() definition to...
* src/system.h: ...here.
(is_nul): Reimplement with a version that doesn't
require a sentinel after the buffer, and which calls
down to (the system optimized) memcmp.
Performance analyzed at http://rusty.ozlabs.org/?p=560
* src/dd.c (alloc_obuf): Simplify the is_nul() call by
not needing to write the sentinel.
* src/copy.c (sparse_copy): Likewise.
(copy_reg): Simplify the buffer allocation by avoiding
consideration of the sentinel in the buffer size calculation.
| src/copy.c | diffblobblamehistory | |
| src/dd.c | diffblobblamehistory | |
| src/factor.c | diffblobblamehistory | |
| src/system.h | diffblobblamehistory |