3 Commits

Author	SHA1	Message	Date
Christopher Ferris	2fc0717977	Add new optimized strlen for arm. ... This optimized version is primarily targeted at cortex-a15. Tested on all nexus devices using the system/extras/libc_test strlen test. Tested alignments from 1 to 32 that are powers of 2. Tested that strlen does not cross page boundaries at all alignments. Speed improvements listed below: cortex-a15 - Sizes >= 32 bytes, ~75% improvement. - Sizes >= 1024 bytes, ~250% improvement. cortex-a9 - Sizes >= 32 bytes, ~75% improvement. - Sizes >= 1024 bytes, ~85% improvement. krait - Sizes >= 32 bytes, ~95% improvement. - Sizes >= 1024 bytes, ~160% improvement. Change-Id: I361b1a36ed89ab991f2a8f0abbf0d7416d39c8f5	2013-07-15 12:37:51 -07:00
Christopher Ferris	a9a5870d16	Create arch specific versions of strcmp. ... This uses the new strcmp.a15.S code as the basis for new versions of strcmp.S. The cortex-a15 code is the performance optimized version of strcmp.a15.S taken with only the addition of a few pld instructions. The cortex-a9 code is the same as the cortex-a15 code except that the unaligned strcmp code was taken from the original strcmp.S. The krait code is the same as the cortex-a15 code except that one path in the unaligned strcmp code was taken from the original strcmp.S code (the 2 byte overlap case). The generic code is the original unmodified strmp.S from the bionic subdirectory. All three new versions underwent these test cases: Strings the same, all same size: - Both pointers double word aligned. - One pointer double word aligned, one pointer word aligned. - Both pointers word aligned. - One pointer double word aligned, one pointer 1 off a word alignment. - One pointer double word aligned, one pointer 2 off a word alignment. - One pointer double word aligned, one pointer 3 off a word alignment. - One pointer word aligned, one pointer 1 off a word alignment. - One pointer word aligned, one pointer 2 off a word alignment. - One pointer word aligned, one pointer 3 off a word alignment. For all cases where it made sense, the two pointers were also tested swapped. Different strings, all same size: - Single difference at double word boundary. - Single difference at word boudary. - Single difference at 1 off a word alignment. - Single difference at 2 off a word alignment. - Single difference at 3 off a word alignment. Different sized strings, strings the same until the end: - Shorter string ends on a double word boundary. - Shorter string ends on word boundary. - Shorter string ends at 1 off a word boundary. - Shorter string ends at 2 off a word boundary. - Shorter string ends at 3 off a word boundary. For all different cases, run them through the same pointer alignment cases when the strings are the same size. For all cases the two pointers were also tested swapped. Bug: 8005082 Change-Id: I5f3dc02b48afba2cb9c13332ab45c828ff171a1c	2013-03-12 10:25:11 -07:00
Christopher Ferris	acdde8c1cf	Break bionic implementations into arch versions. ... Move arch specific code for arm, mips, x86 into separate makefiles. In addition, add different arm cpu versions of memcpy/memset. Bug: 8005082 Change-Id: I04f3d0715104fab618e1abf7cf8f7eec9bec79df	2013-02-26 16:04:34 -08:00