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| author | Christopher Ferris <cferris@google.com> | 2013-07-15 12:49:26 -0700 |
|---|---|---|
| committer | Christopher Ferris <cferris@google.com> | 2013-08-08 11:13:46 -0700 |
| commit | 4e24dcc8d869db7303650d8444c8796445fbbc07 (patch) | |
| tree | 0be95e3a9d17dafa7368394f03f304e051e0d38e /libc/arch-arm/arm.mk | |
| parent | cd927519a94939f2ebc307544f827baade529bc9 (diff) | |
| download | bionic-4e24dcc8d869db7303650d8444c8796445fbbc07.zip bionic-4e24dcc8d869db7303650d8444c8796445fbbc07.tar.gz bionic-4e24dcc8d869db7303650d8444c8796445fbbc07.tar.bz2 | |
Optimize strcat/strcpy, small tweaks to strlen. DO NOT MERGE
Create one version of strcat/strcpy/strlen for cortex-a15/krait and another
version for cortex-a9.
Tested with the libc_test strcat/strcpy/strlen tests.
Including new tests that verify that the src for strcat/strcpy do not
overread across page boundaries.
NOTE: The handling of unaligned strcpy (same code in strcat) could probably
be optimized further such that the src is read 64 bits at a time instead of
the partial reads occurring now.
strlen improves slightly since it was recently optimized.
Performance improvements for strcpy and strcat (using an empty dest string):
cortex-a9
- Small copies vary from about 5% to 20% as the size gets above 10 bytes.
- Copies >= 1024, about a 60% improvement.
- Unaligned copies, from about 40% improvement.
cortex-a15
- Most small copies exhibit a 100% improvement, a few copies only
improve by 20%.
- Copies >= 1024, about 150% improvement.
- Unaligned copies, about 100% improvement.
krait
- Most small copies vary widely, but on average 20% improvement, then
the performance gets better, hitting about a 100% improvement when
copies 64 bytes of data.
- Copies >= 1024, about 100% improvement.
- When coping MBs of data, about 50% improvement.
- Unaligned copies, about 90% improvement.
As strcat destination strings get larger in size:
cortex-a9
- about 40% improvement for small dst strings (>= 32).
- about 250% improvement for dst strings >= 1024.
cortex-a15
- about 200% improvement for small dst strings (>=32).
- about 250% improvement for dst strings >= 1024.
krait
- about 25% improvement for small dst strings (>=32).
- about 100% improvement for dst strings >=1024.
Merge from internal master.
(cherry-picked from d119b7b6f48fe507088cfb98bcafa99b320fd884)
Change-Id: I296463b251ef9fab004ee4dded2793feca5b547a
Diffstat (limited to 'libc/arch-arm/arm.mk')
| -rw-r--r-- | libc/arch-arm/arm.mk | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/libc/arch-arm/arm.mk b/libc/arch-arm/arm.mk index 1a2185f..7fb15a1 100644 --- a/libc/arch-arm/arm.mk +++ b/libc/arch-arm/arm.mk @@ -14,7 +14,6 @@ _LIBC_ARCH_COMMON_SRC_FILES := \ arch-arm/bionic/_setjmp.S \ arch-arm/bionic/setjmp.S \ arch-arm/bionic/sigsetjmp.S \ - arch-arm/bionic/strcpy.S \ arch-arm/bionic/syscall.S \ arch-arm/bionic/tgkill.S \ arch-arm/bionic/tkill.S \ |