bionic/libc/arch-arm/generic/generic.mk

$(call libc-add-cpu-variant-src,MEMCPY,arch-arm/generic/bionic/memcpy.S)
$(call libc-add-cpu-variant-src,MEMSET,arch-arm/generic/bionic/memset.S)
$(call libc-add-cpu-variant-src,STRCMP,arch-arm/generic/bionic/strcmp.S)
$(call libc-add-cpu-variant-src,STRLEN,arch-arm/generic/bionic/strlen.c)
Break bionic implementations into arch versions. Move arch specific code for arm, mips, x86 into separate makefiles. In addition, add different arm cpu versions of memcpy/memset. Bug: 8005082 Merge from internal master (acdde8c1cf8e8beed98c052757d96695b820b50c). Change-Id: I04f3d0715104fab618e1abf7cf8f7eec9bec79df 2013-02-26 10:30:00 +01:00			`$(call libc-add-cpu-variant-src,MEMCPY,arch-arm/generic/bionic/memcpy.S)`
			`$(call libc-add-cpu-variant-src,MEMSET,arch-arm/generic/bionic/memset.S)`
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 Merge from internal master. (cherry-picked from commit a9a5870d166f8060a8182cd61e5536b0becea74e) Change-Id: I4c2b98f8a50804fb98ab67f75e9d660f1315a144 2013-03-09 01:50:31 +01:00			`$(call libc-add-cpu-variant-src,STRCMP,arch-arm/generic/bionic/strcmp.S)`
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. Merge from internal master. (cherry-picked from 2fc071797743b88a9a47427d46baed7c7b24f4d2) Change-Id: I1ceceb4e745fd68e9d946f96d1d42e0cdaff6ccf 2013-07-10 23:31:03 +02:00			`$(call libc-add-cpu-variant-src,STRLEN,arch-arm/generic/bionic/strlen.c)`