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S390: Add z13 memmove ifunc variant.
This patch introduces a z13 specific ifunc variant for memmove. As the common code implementation, it checks if we can copy from the beginning to the end - with z196 memcpy implementation - or if we have to copy from the end to the beginning. The latter case is done by using vector load/store instructions. If vector instructions are not available, the common-code is used as fallback. Therefore it is implemented in memmove-c with a different name. Furthermore the ifunc logic decides if we need the common-code implementation at all. If vector instructions are supported due to the minimum architecture level set we can skip the common-code ifunc variant. ChangeLog: * sysdeps/s390/Makefile (sysdep_routines): Add memmove-c. * sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_IFUNC, HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT, MEMMOVE_DEFAULT, HAVE_MEMMOVE_C, MEMMOVE_C, HAVE_MEMMOVE_Z13, MEMMOVE_Z13): New defines. * sysdeps/s390/memcpy-z900.S: Add z13 memmove implementation. * sysdeps/s390/memmove-c.c: New file. * sysdeps/s390/memmove.c: Likewise. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add ifunc variants for memmove.
This commit is contained in:
Stefan Liebler
parent
2ee1bc57ab
commit
cdd927d98c
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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* sysdeps/s390/Makefile (sysdep_routines): Add memmove-c.
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* sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_IFUNC,
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HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT, MEMMOVE_DEFAULT,
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HAVE_MEMMOVE_C, MEMMOVE_C, HAVE_MEMMOVE_Z13, MEMMOVE_Z13):
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New defines.
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* sysdeps/s390/memcpy-z900.S: Add z13 memmove implementation.
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* sysdeps/s390/memmove-c.c: New file.
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* sysdeps/s390/memmove.c: Likewise.
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* sysdeps/s390/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Add ifunc variants for memmove.
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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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* config.h.in (HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT): New undefine.
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@ -56,5 +56,6 @@ endif
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ifeq ($(subdir),string)
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sysdep_routines += bzero memset memset-z900 \
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memcmp memcmp-z900 \
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mempcpy memcpy memcpy-z900
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mempcpy memcpy memcpy-z900 \
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memmove memmove-c
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endif
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@ -43,6 +43,29 @@
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# define HAVE_MEMCPY_Z196 HAVE_MEMCPY_IFUNC
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#endif
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#if defined SHARED && defined USE_MULTIARCH && IS_IN (libc) \
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&& ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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# define HAVE_MEMMOVE_IFUNC 1
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#else
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# define HAVE_MEMMOVE_IFUNC 0
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#endif
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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# define HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT HAVE_MEMMOVE_IFUNC
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#else
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# define HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT 0
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#endif
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#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT
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# define MEMMOVE_DEFAULT MEMMOVE_Z13
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# define HAVE_MEMMOVE_C 0
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# define HAVE_MEMMOVE_Z13 1
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#else
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# define MEMMOVE_DEFAULT MEMMOVE_C
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# define HAVE_MEMMOVE_C 1
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# define HAVE_MEMMOVE_Z13 HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT
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#endif
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#if HAVE_MEMCPY_Z900_G5
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# define MEMCPY_Z900_G5 __memcpy_default
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# define MEMPCPY_Z900_G5 __mempcpy_default
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@ -66,3 +89,15 @@
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# define MEMCPY_Z196 NULL
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# define MEMPCPY_Z196 NULL
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#endif
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#if HAVE_MEMMOVE_C
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# define MEMMOVE_C __memmove_c
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#else
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# define MEMMOVE_C NULL
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#endif
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#if HAVE_MEMMOVE_Z13
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# define MEMMOVE_Z13 __memmove_z13
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#else
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# define MEMMOVE_Z13 NULL
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#endif
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@ -182,6 +182,7 @@ ENTRY(MEMCPY_Z196)
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# endif /* !defined __s390x__ */
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ltgr %r4,%r4
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je .L_Z196_4
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.L_Z196_start2:
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aghi %r4,-1
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srlg %r5,%r4,8
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ltgr %r5,%r5
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@ -207,6 +208,75 @@ ENTRY(MEMCPY_Z196)
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END(MEMCPY_Z196)
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#endif /* HAVE_MEMCPY_Z196 */
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#if HAVE_MEMMOVE_Z13
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ENTRY(MEMMOVE_Z13)
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.machine "z13"
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.machinemode "zarch_nohighgprs"
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# if !defined __s390x__
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/* Note: The 31bit dst and src pointers are prefixed with zeroes. */
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llgfr %r4,%r4
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llgfr %r3,%r3
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llgfr %r2,%r2
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# endif /* !defined __s390x__ */
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sgrk %r0,%r2,%r3
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clgijh %r4,16,.L_MEMMOVE_Z13_LARGE
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aghik %r5,%r4,-1
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.L_MEMMOVE_Z13_SMALL:
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jl .L_MEMMOVE_Z13_END /* Jump away if len was zero. */
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/* Store up to 16 bytes with vll/vstl which needs the index
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instead of lengths. */
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vll %v16,%r5,0(%r3)
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vstl %v16,%r5,0(%r2)
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.L_MEMMOVE_Z13_END:
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br %r14
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.L_MEMMOVE_Z13_LARGE:
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lgr %r1,%r2 /* For memcpy: r1: Use as dest ;
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r2: Return dest */
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/* The unsigned comparison (dst - src >= len) determines if we can
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execute the forward case with memcpy. */
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#if ! HAVE_MEMCPY_Z196
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# error The z13 variant of memmove needs the z196 variant of memcpy!
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#endif
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clgrjhe %r0,%r4,.L_Z196_start2
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risbgn %r5,%r4,4,128+63,60 /* r5 = r4 / 16 */
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aghi %r4,-16
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clgijhe %r5,8,.L_MEMMOVE_Z13_LARGE_64B
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.L_MEMMOVE_Z13_LARGE_16B_LOOP:
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/* Store at least 16 bytes with vl/vst. The number of 16byte blocks
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is stored in r5. */
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vl %v16,0(%r4,%r3)
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vst %v16,0(%r4,%r2)
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aghi %r4,-16
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brctg %r5,.L_MEMMOVE_Z13_LARGE_16B_LOOP
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aghik %r5,%r4,15
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j .L_MEMMOVE_Z13_SMALL
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.L_MEMMOVE_Z13_LARGE_64B:
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/* Store at least 128 bytes with 4x vl/vst. The number of 64byte blocks
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will be stored in r0. */
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aghi %r4,-48
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srlg %r0,%r5,2 /* r5 = %r0 / 4
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=> Number of 64byte blocks. */
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.L_MEMMOVE_Z13_LARGE_64B_LOOP:
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vl %v20,48(%r4,%r3)
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vl %v19,32(%r4,%r3)
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vl %v18,16(%r4,%r3)
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vl %v17,0(%r4,%r3)
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vst %v20,48(%r4,%r2)
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vst %v19,32(%r4,%r2)
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vst %v18,16(%r4,%r2)
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vst %v17,0(%r4,%r2)
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aghi %r4,-64
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brctg %r0,.L_MEMMOVE_Z13_LARGE_64B_LOOP
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aghi %r4,48
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/* Recalculate the number of 16byte blocks. */
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risbg %r5,%r5,62,128+63,0 /* r5 = r5 & 3
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=> Remaining 16byte blocks. */
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jne .L_MEMMOVE_Z13_LARGE_16B_LOOP
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aghik %r5,%r4,15
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j .L_MEMMOVE_Z13_SMALL
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END(MEMMOVE_Z13)
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#endif /* HAVE_MEMMOVE_Z13 */
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#if ! HAVE_MEMCPY_IFUNC
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/* If we don't use ifunc, define an alias for mem[p]cpy here.
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Otherwise see sysdeps/s390/mem[p]cpy.c. */
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@ -215,10 +285,27 @@ strong_alias (MEMPCPY_DEFAULT, __mempcpy)
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weak_alias (__mempcpy, mempcpy)
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#endif
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#if ! HAVE_MEMMOVE_IFUNC
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/* If we don't use ifunc, define an alias for memmove here.
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Otherwise see sysdeps/s390/memmove.c. */
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# if ! HAVE_MEMMOVE_C
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/* If the c variant is needed, then sysdeps/s390/memmove-c.c
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defines memmove.
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Otherwise MEMMOVE_DEFAULT is implemented here and we have to define it. */
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strong_alias (MEMMOVE_DEFAULT, memmove)
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# endif
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#endif
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#if defined SHARED && IS_IN (libc)
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/* Defines the internal symbols.
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Compare to libc_hidden_[builtin_]def (mem[p]cpy) in string/mem[p]cpy.c. */
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strong_alias (MEMCPY_DEFAULT, __GI_memcpy)
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strong_alias (MEMPCPY_DEFAULT, __GI_mempcpy)
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strong_alias (MEMPCPY_DEFAULT, __GI___mempcpy)
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# if ! HAVE_MEMMOVE_C
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/* If the c variant is needed, then sysdeps/s390/memmove-c.c
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defines the internal symbol.
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Otherwise MEMMOVE_DEFAULT is implemented here and we have to define it. */
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strong_alias (MEMMOVE_DEFAULT, __GI_memmove)
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# endif
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#endif
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37
sysdeps/s390/memmove-c.c
Normal file
37
sysdeps/s390/memmove-c.c
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@ -0,0 +1,37 @@
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/* Fallback C version of memmove.
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Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ifunc-memcpy.h>
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#if HAVE_MEMMOVE_C
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# if HAVE_MEMMOVE_IFUNC
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/* If we use ifunc, then the memmove symbol is defined
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in sysdeps/s390/memmove.c and we use a different name here.
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Otherwise, we have to define memmove here or in
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sysdeps/s390/memcpy.S depending on the used default implementation. */
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# define MEMMOVE MEMMOVE_C
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# if defined SHARED && IS_IN (libc)
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/* Define the internal symbol. */
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# undef libc_hidden_builtin_def
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# define libc_hidden_builtin_def(name) \
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__hidden_ver1 (__memmove_c, __GI_memmove, __memmove_c);
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# endif
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# endif
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# include <string/memmove.c>
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#endif
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44
sysdeps/s390/memmove.c
Normal file
44
sysdeps/s390/memmove.c
Normal file
@ -0,0 +1,44 @@
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/* Multiple versions of memmove.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <ifunc-memcpy.h>
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#if HAVE_MEMMOVE_IFUNC
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/* If we don't use ifunc, an alias is defined for memmove
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in sysdeps/s390/memmove-c.c or sysdeps/s390/memcpy.S
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depending on the used default implementation. */
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# undef memmove
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# define memmove __redirect_memmove
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# include <string.h>
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# include <ifunc-resolve.h>
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# undef memmove
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# if HAVE_MEMMOVE_C
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extern __typeof (__redirect_memmove) MEMMOVE_C attribute_hidden;
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# endif
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# if HAVE_MEMMOVE_Z13
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extern __typeof (__redirect_memmove) MEMMOVE_Z13 attribute_hidden;
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# endif
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s390_libc_ifunc_expr (__redirect_memmove, memmove,
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(HAVE_MEMMOVE_Z13 && (hwcap & HWCAP_S390_VX))
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? MEMMOVE_Z13
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: MEMMOVE_DEFAULT
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)
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#endif
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@ -126,6 +126,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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)
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#endif /* HAVE_MEMCPY_IFUNC */
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#if HAVE_MEMMOVE_IFUNC
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IFUNC_IMPL (i, name, memmove,
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# if HAVE_MEMMOVE_Z13
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IFUNC_IMPL_ADD (array, i, memmove,
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dl_hwcap & HWCAP_S390_VX, MEMMOVE_Z13)
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# endif
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# if HAVE_MEMMOVE_C
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IFUNC_IMPL_ADD (array, i, memmove, 1, MEMMOVE_C)
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# endif
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)
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#endif /* HAVE_MEMMOVE_IFUNC */
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#ifdef HAVE_S390_VX_ASM_SUPPORT
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# define IFUNC_VX_IMPL(FUNC) \
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