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
33 lines
1.2 KiB
Makefile
33 lines
1.2 KiB
Makefile
_LIBC_ARCH_COMMON_SRC_FILES := \
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arch-arm/bionic/abort_arm.S \
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arch-arm/bionic/atomics_arm.c \
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arch-arm/bionic/clone.S \
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arch-arm/bionic/eabi.c \
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arch-arm/bionic/_exit_with_stack_teardown.S \
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arch-arm/bionic/ffs.S \
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arch-arm/bionic/futex_arm.S \
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arch-arm/bionic/__get_sp.S \
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arch-arm/bionic/kill.S \
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arch-arm/bionic/libgcc_compat.c \
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arch-arm/bionic/memcmp16.S \
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arch-arm/bionic/memcmp.S \
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arch-arm/bionic/_setjmp.S \
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arch-arm/bionic/setjmp.S \
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arch-arm/bionic/sigsetjmp.S \
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arch-arm/bionic/syscall.S \
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arch-arm/bionic/tgkill.S \
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arch-arm/bionic/tkill.S \
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# These are used by the static and dynamic versions of the libc
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# respectively.
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_LIBC_ARCH_STATIC_SRC_FILES := \
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arch-arm/bionic/exidx_static.c
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_LIBC_ARCH_DYNAMIC_SRC_FILES := \
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arch-arm/bionic/exidx_dynamic.c
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ifeq ($(strip $(wildcard bionic/libc/arch-arm/$(TARGET_CPU_VARIANT)/$(TARGET_CPU_VARIANT).mk)),)
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$(error "TARGET_CPU_VARIANT not set or set to an unknown value. Possible values are cortex-a7, cortex-a8, cortex-a9, cortex-a15, krait. Use generic for devices that do not have a CPU similar to any of the supported cpu variants.")
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endif
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include bionic/libc/arch-arm/$(TARGET_CPU_VARIANT)/$(TARGET_CPU_VARIANT).mk
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