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S390: Add arch13 memmove ifunc variant.

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This patch introduces the new arch13 ifunc variant for memmove.
For the forward or non-overlapping case it is just using memcpy.
For the backward case it relies on the new instruction mvcrl.
The instruction copies up to 256 bytes at once.
In case of an overlap, it copies the bytes like copying them
one by one starting from right to left.

ChangeLog:

	* sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_ARCH13, MEMMOVE_ARCH13
	HAVE_MEMMOVE_IFUNC_AND_ARCH13_SUPPORT): New defines.
	* sysdeps/s390/memcpy-z900.S: Add arch13 memmove implementation.
	* sysdeps/s390/memmove.c (memmove): Add arch13 variant in
	ifunc selector.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc variant for arch13 memmove.
	* sysdeps/s390/multiarch/ifunc-resolve.h (S390_STFLE_BITS_ARCH13_MIE3,
	S390_IS_ARCH13_MIE3): New defines.
This commit is contained in:
Stefan Liebler
2019-03-22 11:14:08 +01:00
parent a899a5512f
commit 96fbb9a328
6 changed files with 111 additions and 5 deletions
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5
sysdeps/s390/multiarch/ifunc-resolve.h
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@@ -22,6 +22,11 @@
#define S390_STFLE_BITS_Z10 34 /* General instructions extension */
#define S390_STFLE_BITS_Z196 45 /* Distinct operands, pop ... */
#define S390_STFLE_BITS_ARCH13_MIE3 61 /* Miscellaneous-Instruction-Extensions
Facility 3, e.g. mvcrl. */
#define S390_IS_ARCH13_MIE3(STFLE_BITS) \
((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_ARCH13_MIE3))) != 0)
#define S390_IS_Z196(STFLE_BITS) \
((STFLE_BITS & (1ULL << (63 - S390_STFLE_BITS_Z196))) != 0)