* libc/machine/aarch64/strchrnul.S: New file.
* libc/machine/aarch64/strchrnul-stub.c: New file. * libc/machine/aarch64/Makefile.am: Add them to build list. * libc/machine/aarch64/Makefile.in: Regenerated.
This commit is contained in:
Richard Earnshaw
parent
5efd066df2
commit
deda48a9fb
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@ -1,7 +1,14 @@
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2014-06-11 Richard Earnshaw <rearnsha@arm.com>
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* libc/machine/aarch64/strchrnul.S: New file.
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* libc/machine/aarch64/strchrnul-stub.c: New file.
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* libc/machine/aarch64/Makefile.am: Add them to build list.
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* libc/machine/aarch64/Makefile.in: Regenerated.
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2014-06-10 Richard Earnshaw <rearnsha@arm.com>
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* libc/machine/aarch64/strchr.S: New file
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* libc/machine/aarch64/strchr-stub.c: New file
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* libc/machine/aarch64/strchr.S: New file.
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* libc/machine/aarch64/strchr-stub.c: New file.
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* libc/machine/aarch64/Makefile.am: Add them to build list.
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* libc/machine/aarch64/Makefile.in: Regenerated.
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@ -20,6 +20,8 @@ lib_a_SOURCES += memset.S
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lib_a_SOURCES += setjmp.S
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lib_a_SOURCES += strchr-stub.c
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lib_a_SOURCES += strchr.S
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lib_a_SOURCES += strchrnul-stub.c
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lib_a_SOURCES += strchrnul.S
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lib_a_SOURCES += strcmp-stub.c
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lib_a_SOURCES += strcmp.S
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lib_a_SOURCES += strlen-stub.c
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@ -74,7 +74,8 @@ am_lib_a_OBJECTS = lib_a-memcmp-stub.$(OBJEXT) lib_a-memcmp.$(OBJEXT) \
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lib_a-memmove-stub.$(OBJEXT) lib_a-memmove.$(OBJEXT) \
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lib_a-memset-stub.$(OBJEXT) lib_a-memset.$(OBJEXT) \
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lib_a-setjmp.$(OBJEXT) lib_a-strchr-stub.$(OBJEXT) \
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lib_a-strchr.$(OBJEXT) lib_a-strcmp-stub.$(OBJEXT) \
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lib_a-strchr.$(OBJEXT) lib_a-strchrnul-stub.$(OBJEXT) \
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lib_a-strchrnul.$(OBJEXT) lib_a-strcmp-stub.$(OBJEXT) \
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lib_a-strcmp.$(OBJEXT) lib_a-strlen-stub.$(OBJEXT) \
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lib_a-strlen.$(OBJEXT) lib_a-strncmp-stub.$(OBJEXT) \
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lib_a-strncmp.$(OBJEXT) lib_a-strnlen-stub.$(OBJEXT) \
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@ -206,8 +207,9 @@ AM_CCASFLAGS = $(INCLUDES)
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noinst_LIBRARIES = lib.a
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lib_a_SOURCES = memcmp-stub.c memcmp.S memcpy-stub.c memcpy.S \
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memmove-stub.c memmove.S memset-stub.c memset.S setjmp.S \
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strchr-stub.c strchr.S strcmp-stub.c strcmp.S strlen-stub.c \
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strlen.S strncmp-stub.c strncmp.S strnlen-stub.c strnlen.S
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strchr-stub.c strchr.S strchrnul-stub.c strchrnul.S \
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strcmp-stub.c strcmp.S strlen-stub.c strlen.S strncmp-stub.c \
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strncmp.S strnlen-stub.c strnlen.S
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lib_a_CCASFLAGS = $(AM_CCASFLAGS)
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lib_a_CFLAGS = $(AM_CFLAGS)
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ACLOCAL_AMFLAGS = -I ../../.. -I ../../../..
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@ -306,6 +308,12 @@ lib_a-strchr.o: strchr.S
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lib_a-strchr.obj: strchr.S
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$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strchr.obj `if test -f 'strchr.S'; then $(CYGPATH_W) 'strchr.S'; else $(CYGPATH_W) '$(srcdir)/strchr.S'; fi`
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lib_a-strchrnul.o: strchrnul.S
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$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strchrnul.o `test -f 'strchrnul.S' || echo '$(srcdir)/'`strchrnul.S
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lib_a-strchrnul.obj: strchrnul.S
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$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strchrnul.obj `if test -f 'strchrnul.S'; then $(CYGPATH_W) 'strchrnul.S'; else $(CYGPATH_W) '$(srcdir)/strchrnul.S'; fi`
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lib_a-strcmp.o: strcmp.S
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$(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CCASFLAGS) $(CCASFLAGS) -c -o lib_a-strcmp.o `test -f 'strcmp.S' || echo '$(srcdir)/'`strcmp.S
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@ -366,6 +374,12 @@ lib_a-strchr-stub.o: strchr-stub.c
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lib_a-strchr-stub.obj: strchr-stub.c
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$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strchr-stub.obj `if test -f 'strchr-stub.c'; then $(CYGPATH_W) 'strchr-stub.c'; else $(CYGPATH_W) '$(srcdir)/strchr-stub.c'; fi`
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lib_a-strchrnul-stub.o: strchrnul-stub.c
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$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strchrnul-stub.o `test -f 'strchrnul-stub.c' || echo '$(srcdir)/'`strchrnul-stub.c
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lib_a-strchrnul-stub.obj: strchrnul-stub.c
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$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strchrnul-stub.obj `if test -f 'strchrnul-stub.c'; then $(CYGPATH_W) 'strchrnul-stub.c'; else $(CYGPATH_W) '$(srcdir)/strchrnul-stub.c'; fi`
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lib_a-strcmp-stub.o: strcmp-stub.c
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$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-strcmp-stub.o `test -f 'strcmp-stub.c' || echo '$(srcdir)/'`strcmp-stub.c
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@ -0,0 +1,31 @@
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/* Copyright (c) 2014, ARM Limited
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the company nor the names of its contributors
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may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
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# include "../../string/strchrnul.c"
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#else
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/* See strchrnul.S */
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#endif
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@ -0,0 +1,149 @@
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/*
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strchrnul - find a character or nul in a string
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Copyright (c) 2014, ARM Limited
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All rights Reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the company nor the names of its contributors
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may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
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/* See strchrnul-stub.c */
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#else
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/* Assumptions:
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*
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* ARMv8-a, AArch64
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* Neon Available.
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*/
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/* Arguments and results. */
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#define srcin x0
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#define chrin w1
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#define result x0
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#define src x2
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#define tmp1 x3
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#define wtmp2 w4
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#define tmp3 x5
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#define vrepchr v0
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#define vdata1 v1
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#define vdata2 v2
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#define vhas_nul1 v3
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#define vhas_nul2 v4
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#define vhas_chr1 v5
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#define vhas_chr2 v6
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#define vrepmask v15
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#define vend1 v16
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/* Core algorithm.
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For each 32-byte hunk we calculate a 64-bit syndrome value, with
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two bits per byte (LSB is always in bits 0 and 1, for both big
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and little-endian systems). For each tuple, bit 0 is set iff
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the relevant byte matched the requested character or nul. Since the
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bits in the syndrome reflect exactly the order in which things occur
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in the original string a count_trailing_zeros() operation will
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identify exactly which byte is causing the termination. */
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/* Locals and temporaries. */
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.macro def_fn f p2align=0
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.text
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.p2align \p2align
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.global \f
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.type \f, %function
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\f:
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.endm
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def_fn strchrnul
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/* Magic constant 0x40100401 to allow us to identify which lane
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matches the termination condition. */
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mov wtmp2, #0x0401
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movk wtmp2, #0x4010, lsl #16
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dup vrepchr.16b, chrin
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bic src, srcin, #31 /* Work with aligned 32-byte hunks. */
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dup vrepmask.4s, wtmp2
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ands tmp1, srcin, #31
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b.eq .Lloop
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/* Input string is not 32-byte aligned. Rather than forcing
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the padding bytes to a safe value, we calculate the syndrome
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for all the bytes, but then mask off those bits of the
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syndrome that are related to the padding. */
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ld1 {vdata1.16b, vdata2.16b}, [src], #32
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neg tmp1, tmp1
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cmeq vhas_nul1.16b, vdata1.16b, #0
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cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
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cmeq vhas_nul2.16b, vdata2.16b, #0
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cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
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orr vhas_chr1.16b, vhas_chr1.16b, vhas_nul1.16b
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orr vhas_chr2.16b, vhas_chr2.16b, vhas_nul2.16b
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and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
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and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
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lsl tmp1, tmp1, #1
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addp vend1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128
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mov tmp3, #~0
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addp vend1.16b, vend1.16b, vend1.16b // 128->64
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lsr tmp1, tmp3, tmp1
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mov tmp3, vend1.2d[0]
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bic tmp1, tmp3, tmp1 // Mask padding bits.
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cbnz tmp1, .Ltail
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.Lloop:
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ld1 {vdata1.16b, vdata2.16b}, [src], #32
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cmeq vhas_nul1.16b, vdata1.16b, #0
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cmeq vhas_chr1.16b, vdata1.16b, vrepchr.16b
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cmeq vhas_nul2.16b, vdata2.16b, #0
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cmeq vhas_chr2.16b, vdata2.16b, vrepchr.16b
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/* Use a fast check for the termination condition. */
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orr vhas_chr1.16b, vhas_nul1.16b, vhas_chr1.16b
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orr vhas_chr2.16b, vhas_nul2.16b, vhas_chr2.16b
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orr vend1.16b, vhas_chr1.16b, vhas_chr2.16b
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addp vend1.2d, vend1.2d, vend1.2d
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mov tmp1, vend1.2d[0]
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cbz tmp1, .Lloop
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/* Termination condition found. Now need to establish exactly why
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we terminated. */
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and vhas_chr1.16b, vhas_chr1.16b, vrepmask.16b
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and vhas_chr2.16b, vhas_chr2.16b, vrepmask.16b
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addp vend1.16b, vhas_chr1.16b, vhas_chr2.16b // 256->128
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addp vend1.16b, vend1.16b, vend1.16b // 128->64
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mov tmp1, vend1.2d[0]
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.Ltail:
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/* Count the trailing zeros, by bit reversing... */
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rbit tmp1, tmp1
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/* Re-bias source. */
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sub src, src, #32
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clz tmp1, tmp1 /* ... and counting the leading zeros. */
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/* tmp1 is twice the offset into the fragment. */
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add result, src, tmp1, lsr #1
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ret
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.size strchrnul, . - strchrnul
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#endif
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