d119b7b6f4
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. Change-Id: Ifd091ebdbce70fe35a7c5d8f71d5914255f3af35
9 lines
505 B
Makefile
9 lines
505 B
Makefile
$(call libc-add-cpu-variant-src,MEMCPY,arch-arm/cortex-a15/bionic/memcpy.S)
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$(call libc-add-cpu-variant-src,MEMSET,arch-arm/cortex-a15/bionic/memset.S)
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$(call libc-add-cpu-variant-src,STRCAT,arch-arm/cortex-a15/bionic/strcat.S)
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$(call libc-add-cpu-variant-src,STRCMP,arch-arm/cortex-a15/bionic/strcmp.S)
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$(call libc-add-cpu-variant-src,STRCPY,arch-arm/cortex-a15/bionic/strcpy.S)
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$(call libc-add-cpu-variant-src,STRLEN,arch-arm/cortex-a15/bionic/strlen.S)
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include bionic/libc/arch-arm/generic/generic.mk
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