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| author | Stefan Liebler <stli@linux.ibm.com> | 2019-03-22 11:14:08 +0100 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2019-03-22 11:14:08 +0100 |
| commit | 96fbb9a328232e42814334d6e29a9a9c7995c01d (patch) | |
| tree | 3df42c7279ddb720eb4b57cd5f685619d8bad08d /sysdeps/s390/multiarch | |
| parent | a899a5512f618d5c4093a2d65e8dee07c791b0ab (diff) | |
| download | glibc-96fbb9a328232e42814334d6e29a9a9c7995c01d.tar.gz | |
S390: Add arch13 memmove ifunc variant.
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.
Diffstat (limited to 'sysdeps/s390/multiarch')
| -rw-r--r-- | sysdeps/s390/multiarch/ifunc-impl-list.c | 5 | ||||
| -rw-r--r-- | sysdeps/s390/multiarch/ifunc-resolve.h | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c index b54c52af36..d742d66a6a 100644 --- a/sysdeps/s390/multiarch/ifunc-impl-list.c +++ b/sysdeps/s390/multiarch/ifunc-impl-list.c @@ -169,6 +169,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, #if HAVE_MEMMOVE_IFUNC IFUNC_IMPL (i, name, memmove, +# if HAVE_MEMMOVE_ARCH13 + IFUNC_IMPL_ADD (array, i, memmove, + S390_IS_ARCH13_MIE3 (stfle_bits), + MEMMOVE_ARCH13) +# endif # if HAVE_MEMMOVE_Z13 IFUNC_IMPL_ADD (array, i, memmove, dl_hwcap & HWCAP_S390_VX, MEMMOVE_Z13) diff --git a/sysdeps/s390/multiarch/ifunc-resolve.h b/sysdeps/s390/multiarch/ifunc-resolve.h index b833dfef28..743de9e591 100644 --- a/sysdeps/s390/multiarch/ifunc-resolve.h +++ b/sysdeps/s390/multiarch/ifunc-resolve.h @@ -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) |