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powerpc: Optimized rawmemchr for POWER9
This version uses vector instructions and is up to 60% faster on medium
matches and up to 90% faster on long matches, compared to the POWER7
version. A few examples:
__rawmemchr_power9 __rawmemchr_power7
Length 32, alignment 0: 2.27566 3.77765
Length 64, alignment 2: 2.46231 3.51064
Length 1024, alignment 0: 17.3059 32.6678
This commit is contained in:
Anton Blanchard
Paul E. Murphy
parent
9e38f455a6
commit
765de945ef
107
sysdeps/powerpc/powerpc64/le/power9/rawmemchr.S
Normal file
107
sysdeps/powerpc/powerpc64/le/power9/rawmemchr.S
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@ -0,0 +1,107 @@
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/* Optimized rawmemchr implementation for PowerPC64/POWER9.
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Copyright (C) 2020 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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#ifndef RAWMEMCHR
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# define RAWMEMCHR __rawmemchr
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#endif
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/* Implements the function
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int [r3] rawmemchr (void *s [r3], int c [r4])
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The implementation can load bytes past a matching byte, but only
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up to the next 16B boundary, so it never crosses a page. */
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.machine power9
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ENTRY_TOCLESS (RAWMEMCHR, 4)
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CALL_MCOUNT 2
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xori r5,r4,0xff
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mtvsrd v18+32,r4 /* matching char in v18 */
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mtvsrd v19+32,r5 /* non matching char in v19 */
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vspltb v18,v18,7 /* replicate */
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vspltb v19,v19,7 /* replicate */
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neg r5,r3
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rldicl r9,r5,0,60 /* How many bytes to get source 16B aligned? */
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/* Align data and fill bytes not loaded with non matching char */
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lvx v0,0,r3
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lvsr v1,0,r3
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vperm v0,v19,v0,v1
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vcmpequb. v6,v0,v18 /* 0xff if byte matches, 0x00 otherwise */
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beq cr6,L(aligned)
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vctzlsbb r0,v6
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add r3,r3,r0
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blr
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L(aligned):
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add r3,r3,r9
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L(loop):
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lxv v0+32,0(r3)
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vcmpequb. v6,v0,v18 /* 0xff if byte matches, 0x00 otherwise */
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bne cr6,L(tail1)
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lxv v0+32,16(r3)
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vcmpequb. v6,v0,v18 /* 0xff if byte matches, 0x00 otherwise */
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bne cr6,L(tail2)
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lxv v0+32,32(r3)
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vcmpequb. v6,v0,v18 /* 0xff if byte matches, 0x00 otherwise */
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bne cr6,L(tail3)
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lxv v0+32,48(r3)
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vcmpequb. v6,v0,v18 /* 0xff if byte matches, 0x00 otherwise */
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bne cr6,L(tail4)
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addi r3,r3,64
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b L(loop)
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L(tail1):
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vctzlsbb r0,v6
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add r3,r3,r0
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blr
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L(tail2):
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vctzlsbb r0,v6
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add r3,r3,r0
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addi r3,r3,16
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blr
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L(tail3):
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vctzlsbb r0,v6
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add r3,r3,r0
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addi r3,r3,32
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blr
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L(tail4):
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vctzlsbb r0,v6
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add r3,r3,r0
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addi r3,r3,48
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blr
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END (RAWMEMCHR)
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weak_alias (__rawmemchr,rawmemchr)
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libc_hidden_builtin_def (__rawmemchr)
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@ -32,7 +32,8 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
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strncase-power8
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ifneq (,$(filter %le,$(config-machine)))
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sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9 stpcpy-power9
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sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9 stpcpy-power9 \
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rawmemchr-power9
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endif
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CFLAGS-strncase-power7.c += -mcpu=power7 -funroll-loops
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CFLAGS-strncase_l-power7.c += -mcpu=power7 -funroll-loops
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@ -216,6 +216,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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/* Support sysdeps/powerpc/powerpc64/multiarch/rawmemchr.c. */
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IFUNC_IMPL (i, name, rawmemchr,
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#ifdef __LITTLE_ENDIAN__
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IFUNC_IMPL_ADD (array, i, rawmemchr,
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hwcap2 & PPC_FEATURE2_ARCH_3_00,
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__rawmemchr_power9)
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#endif
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IFUNC_IMPL_ADD (array, i, rawmemchr,
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hwcap & PPC_FEATURE_HAS_VSX,
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__rawmemchr_power7)
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21
sysdeps/powerpc/powerpc64/multiarch/rawmemchr-power9.S
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21
sysdeps/powerpc/powerpc64/multiarch/rawmemchr-power9.S
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@ -0,0 +1,21 @@
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/* Optimized rawmemchr implementation for PowerPC64/POWER9.
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Copyright (C) 2020 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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<https://www.gnu.org/licenses/>. */
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#define RAWMEMCHR __rawmemchr_power9
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#include <sysdeps/powerpc/powerpc64/le/power9/rawmemchr.S>
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@ -24,13 +24,21 @@
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extern __typeof (__rawmemchr) __rawmemchr_ppc attribute_hidden;
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extern __typeof (__rawmemchr) __rawmemchr_power7 attribute_hidden;
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# ifdef __LITTLE_ENDIAN__
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extern __typeof (__rawmemchr) __rawmemchr_power9 attribute_hidden;
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# endif
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# undef __rawmemchr
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/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
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ifunc symbol properly. */
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libc_ifunc_redirected (__redirect___rawmemchr, __rawmemchr,
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(hwcap & PPC_FEATURE_HAS_VSX)
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? __rawmemchr_power7
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# ifdef __LITTLE_ENDIAN__
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(hwcap2 & PPC_FEATURE2_ARCH_3_00)
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? __rawmemchr_power9 :
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# endif
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(hwcap & PPC_FEATURE_HAS_VSX)
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? __rawmemchr_power7
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: __rawmemchr_ppc);
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weak_alias (__rawmemchr, rawmemchr)
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