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glibc/sysdeps/arm
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Prakhar Bahuguna f8f72bc0c3 [ARM] Optimise memchr for NEON-enabled processors 
This patch provides an optimised implementation of memchr using NEON
instructions to improve its performance, especially with longer search regions.
This gave an improvement in performance against the Thumb2+DSP optimised code,
with more significant gains for larger inputs. The NEON code also wins in cases
where the input is small (less than 8 bytes) by defaulting to a simple
byte-by-byte search. This avoids the overhead imposed by filling two quadword
registers from memory.

	* sysdeps/arm/armv7/multiarch/Makefile: Add memchr_neon to
	sysdep_routines.
	* sysdeps/arm/armv7/multiarch/ifunc-impl-list.c: Add define for
	__memchr_neon.
	Add ifunc definitions for __memchr_neon and __memchr_noneon.
	* sysdeps/arm/armv7/multiarch/memchr.S: New file.
	* sysdeps/arm/armv7/multiarch/memchr_impl.S: Likewise.
	* sysdeps/arm/armv7/multiarch/memchr_neon.S: Likewise.

Testing done: Ran regression tests for arm-none-linux-gnueabihf as well as a
full toolchain bootstrap. Benchmark tests were ran on ARMv7-A and ARMv8-A
hardware targets.
2017-06-27 15:43:50 +00:00
..
armv6 Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
armv6t2 Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
armv7 [ARM] Optimise memchr for NEON-enabled processors 2017-06-27 15:43:50 +00:00
bits Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
include/bits Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
nptl Optimize generic spinlock code and use C11 like atomic macros. 2017-06-06 09:41:56 +02:00
sys Rename struct ucontext tag (bug 21457). 2017-06-26 22:03:58 +00:00
__longjmp.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
abi-note.S
add_n.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
addmul_1.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
aeabi_assert.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_atexit.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_errno_addr.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_lcsts.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_localeconv.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_math.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_mb_cur_max.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_memclr.c Replace all internal uses of __bzero with memset. This removes the need 2017-06-12 14:56:53 +01:00
aeabi_memcpy.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_memmove.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_memset.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_sighandlers.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
aeabi_unwind_cpp_pr1.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
arm-features.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
arm-mcount.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
arm-unwind-resume.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
atomic-machine.h Optimize generic spinlock code and use C11 like atomic macros. 2017-06-06 09:41:56 +02:00
backtrace.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
bsd-_setjmp.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
bsd-setjmp.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
configure
configure.ac
crti.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
crtn.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-irel.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-machine.h PowerPC64 ELFv2 PPC64_OPT_LOCALENTRY 2017-06-14 10:47:25 +09:30
dl-sysdep.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-tls.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-tlsdesc.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
dl-trampoline.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_sqrt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_sqrtf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fclrexcpt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fedisblxcpt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
feenablxcpt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fegetenv.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fegetexcept.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fegetmode.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fegetround.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
feholdexcpt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fenv_private.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fesetenv.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fesetexcept.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fesetmode.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fesetround.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
feupdateenv.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fgetexcptflg.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
find_exidx.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fix-fp-int-convert-overflow.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fpu_control.h Fix ARM fpu_control.h for assemblers requiring VFP insn names (bug 21047). 2017-01-19 00:05:34 +00:00
fraiseexcpt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
frame.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
framestate.c
fsetexcptflg.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
ftestexcept.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gcc-compat.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
get-rounding-mode.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Implies
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
ldsodefs.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
libc-aeabi_read_tp.S
libc-tls.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
libm-test-ulps Update arm, mips, powerpc-nofpu libm-test-ulps. 2017-02-17 23:10:01 +00:00
libm-test-ulps-name
linkmap.h
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Makefile
math_private.h
math-tests.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
memcpy.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
memmove.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
memset.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
memusage.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
nptl-aeabi_unwind_cpp_pr1.c
preconfigure
preconfigure.ac
pt-arm-unwind-resume.S
rt-aeabi_unwind_cpp_pr1.c
rt-arm-unwind-resume.S
rtld-global-offsets.sym
s_fma.c
s_fmaf.c
setfpucw.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
setjmp.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
sfp-machine.h
sotruss-lib.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
start.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
static-stubs.c
strlen.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
sub_n.S
submul_1.S Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
sysdep.h Remove sfi_* annotations from ARM assembly files. 2017-05-20 08:12:11 -04:00
test-fpucw.c
tls-macros.h
tlsdesc.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tlsdesc.sym
tst-armtlsdescextlazy.c
tst-armtlsdescextlazymod.c
tst-armtlsdescextnow.c
tst-armtlsdescextnowmod.c
tst-armtlsdescloc.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-armtlsdesclocmod.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
tst-audit.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
unwind-pe.c
unwind-resume.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
unwind.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
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