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glibc/sysdeps/s390/s390-32
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Stefan Liebler 4c01126896 S390: Implement mempcpy with help of memcpy. [BZ #19765] 
There exist optimized memcpy functions on s390, but no optimized mempcpy.
This patch adds mempcpy entry points in memcpy.S files, which
use the memcpy implementation. Now mempcpy itself is also an IFUNC function
as memcpy is and the variants are listed in ifunc-impl-list.c.

The s390 string.h does not define _HAVE_STRING_ARCH_mempcpy.
Instead mempcpy string/string.h inlines memcpy() + n.
If n is constant and small enough, GCC emits instructions like mvi or mvc
and avoids the function call to memcpy.
If n is not constant, then memcpy is called and n is added afterwards.
If _HAVE_STRING_ARCH_mempcpy would be defined, mempcpy would be called in
every case.

According to PR70140 "Inefficient expansion of __builtin_mempcpy"
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70140) GCC should handle a
call to mempcpy in the same way as memcpy. Then either the mempcpy macro
in string/string.h has to be removed or _HAVE_STRING_ARCH_mempcpy has to
be defined for S390.

ChangeLog:

	[BZ #19765]
	* sysdeps/s390/mempcpy.S: New File.
	* sysdeps/s390/multiarch/mempcpy.c: Likewise.
	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add mempcpy.
	* sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list):
	Add mempcpy variants.
	* sysdeps/s390/s390-32/memcpy.S: Add mempcpy entry point.
	(memcpy): Adjust to be usable from mempcpy entry point.
	(__memcpy_mvcle): Likewise.
	* sysdeps/s390/s390-64/memcpy.S: Likewise.
	* sysdeps/s390/s390-32/multiarch/memcpy-s390.S: Add entry points
	____mempcpy_z196, ____mempcpy_z10 and add __GI_ symbols for mempcpy.
	(__memcpy_z196): Adjust to be usable from mempcpy entry point.
	(__memcpy_z10): Likewise.
	* sysdeps/s390/s390-64/multiarch/memcpy-s390x.S: Likewise.
2016-05-24 10:39:13 +02:00
..
bits S390: Define SIZE_MAX as unsigned long (BZ #16712). 2014-03-24 16:59:01 +01:00
multiarch S390: Implement mempcpy with help of memcpy. [BZ #19765] 2016-05-24 10:39:13 +02:00
__longjmp.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
add_n.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
addmul_1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
backtrace.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bcopy.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
bsd-_setjmp.S Move sysdeps/s390/s390-32/elf files 2012-03-28 09:31:13 +02:00
bsd-setjmp.S Move sysdeps/s390/s390-32/elf files 2012-03-28 09:31:13 +02:00
bzero.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
crti.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
crtn.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-machine.h S390: Save and restore fprs/vrs while resolving symbols. 2016-03-31 17:37:16 +02:00
dl-sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-trampoline.h S390: Use ahi instead of aghi in 32bit _dl_runtime_resolve. 2016-04-01 10:42:54 +02:00
dl-trampoline.S S390: Save and restore fprs/vrs while resolving symbols. 2016-03-31 17:37:16 +02:00
Implies Update. 2004-07-01 17:50:47 +00:00
Makefile S390: Use fPIC to avoid R_390_GOT12 relocation in gcrt1.o. 2016-05-11 15:51:25 +02:00
memchr.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memcmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
memcpy.S S390: Implement mempcpy with help of memcpy. [BZ #19765] 2016-05-24 10:39:13 +02:00
memset.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mul_1.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
s390-mcount.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setjmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
stackguard-macros.h S390: Use __asm__ instead of asm. 2015-11-20 08:56:40 +01:00
start.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcmp.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strcpy.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
strncpy.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sub_n.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tls-macros.h S390: Use __asm__ instead of asm. 2015-11-20 08:56:40 +01:00
tst-audit.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
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