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authorcvs2svn <>2014-12-18 23:30:28 +0300
committercvs2svn <>2014-12-18 23:30:28 +0300
commit38b85aed54f123088f578c98ead9474c3237b913 (patch)
treee8fa66238e5382a18584e7637fb65278c99a565a /newlib/libc/machine/arm/aeabi_memcpy-armv7a.S
parent7e72fffc61b29325ac5a875c5318cdf2f294ae28 (diff)
This commit was manufactured by cvs2svn to create tag 'newlib-2_1_0'.newlib-2_1_0
Sprout from newlib-2_2_0 2014-12-18 20:30:12 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'newlib-2_2_0'.' Cherrypick from master 2013-12-23 20:45:10 UTC Jeff Johnston <jjohnstn@redhat.com> '2013-12-23 Jeff Johnston <jjohnstn@redhat.com>': COPYING.NEWLIB ChangeLog config.guess config.sub config/ChangeLog configure configure.ac libgloss/ChangeLog libgloss/README libgloss/aarch64/Makefile.in libgloss/aarch64/cpu-init/rdimon-aem-el3.S libgloss/arm/Makefile.in libgloss/arm/configure libgloss/arm/configure.in libgloss/arm/elf-aprofile-validation.specs libgloss/arm/elf-aprofile-ve.specs libgloss/arm/elf-rdimon.specs libgloss/arm/syscalls.c libgloss/bfin/Makefile.in libgloss/configure libgloss/configure.in libgloss/libnosys/nosys.specs libgloss/libnosys/sbrk.c libgloss/mips/crt0.S libgloss/mips/mti32.ld libgloss/mips/mti64.ld libgloss/mips/mti64_64.ld libgloss/mips/mti64_n32.ld libgloss/mips/regs.S libgloss/moxie/Makefile.in libgloss/moxie/configure libgloss/moxie/configure.in libgloss/msp430/Makefile.in libgloss/msp430/crt0.S libgloss/msp430/crtn.S libgloss/msp430/msp430-sim.ld libgloss/msp430/msp430.ld libgloss/msp430/msp430xl-sim.ld libgloss/msp430/nosyscalls.S libgloss/nds32/Makefile.in libgloss/nds32/crt0.S libgloss/nds32/crt1.S libgloss/nds32/syscall_argv.S libgloss/nds32/syscall_argvlen.S libgloss/nds32/syscall_chdir.S libgloss/nds32/syscall_chmod.S libgloss/nds32/syscall_close.S libgloss/nds32/syscall_exit.S libgloss/nds32/syscall_extra.h libgloss/nds32/syscall_fstat.S libgloss/nds32/syscall_getpid.S libgloss/nds32/syscall_gettimeofday.S libgloss/nds32/syscall_isatty.S libgloss/nds32/syscall_kill.S libgloss/nds32/syscall_link.S libgloss/nds32/syscall_lseek.S libgloss/nds32/syscall_open.S libgloss/nds32/syscall_read.S libgloss/nds32/syscall_rename.S libgloss/nds32/syscall_sbrk.S libgloss/nds32/syscall_stat.S libgloss/nds32/syscall_system.S libgloss/nds32/syscall_time.S libgloss/nds32/syscall_times.S libgloss/nds32/syscall_unlink.S libgloss/nds32/syscall_utime.S libgloss/nds32/syscall_write.S ltmain.sh newlib/ChangeLog newlib/NEWS newlib/README 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newlib/libc/machine/fr30/configure newlib/libc/machine/frv/configure newlib/libc/machine/h8300/configure newlib/libc/machine/h8500/configure newlib/libc/machine/hppa/configure newlib/libc/machine/i386/configure newlib/libc/machine/i960/configure newlib/libc/machine/iq2000/configure newlib/libc/machine/lm32/configure newlib/libc/machine/m32c/configure newlib/libc/machine/m32r/configure newlib/libc/machine/m68hc11/configure newlib/libc/machine/m68k/configure newlib/libc/machine/m88k/configure newlib/libc/machine/mep/configure newlib/libc/machine/microblaze/configure newlib/libc/machine/mips/Makefile.am newlib/libc/machine/mips/Makefile.in newlib/libc/machine/mips/configure newlib/libc/machine/mips/setjmp.S newlib/libc/machine/mips/strcmp.c newlib/libc/machine/mn10200/configure newlib/libc/machine/mn10300/configure newlib/libc/machine/moxie/configure newlib/libc/machine/msp430/configure newlib/libc/machine/mt/configure newlib/libc/machine/nds32/Makefile.am newlib/libc/machine/nds32/Makefile.in newlib/libc/machine/nds32/configure newlib/libc/machine/nds32/configure.in newlib/libc/machine/nds32/setjmp.S newlib/libc/machine/necv70/configure newlib/libc/machine/nios2/configure newlib/libc/machine/powerpc/configure newlib/libc/machine/rl78/configure newlib/libc/machine/rl78/setjmp.S newlib/libc/machine/rx/configure newlib/libc/machine/sh/configure newlib/libc/machine/sparc/configure newlib/libc/machine/sparc/setjmp.S newlib/libc/machine/spu/configure newlib/libc/machine/spu/spu_timer_internal.h newlib/libc/machine/tic4x/configure newlib/libc/machine/tic6x/configure newlib/libc/machine/tic80/configure newlib/libc/machine/v850/configure newlib/libc/machine/w65/configure newlib/libc/machine/x86_64/configure newlib/libc/machine/xc16x/configure newlib/libc/machine/xscale/configure newlib/libc/machine/xscale/machine/profile.h newlib/libc/machine/xstormy16/configure newlib/libc/machine/z8k/configure newlib/libc/search/Makefile.am newlib/libc/search/Makefile.in newlib/libc/search/hash.c newlib/libc/search/qsort.c newlib/libc/stdio/Makefile.am newlib/libc/stdio/Makefile.in newlib/libc/stdio/asnprintf.c newlib/libc/stdio/asprintf.c newlib/libc/stdio/clearerr.c newlib/libc/stdio/dprintf.c newlib/libc/stdio/fclose.c newlib/libc/stdio/feof.c newlib/libc/stdio/ferror.c newlib/libc/stdio/fflush.c newlib/libc/stdio/fgetc.c newlib/libc/stdio/fgets.c newlib/libc/stdio/fgetwc.c newlib/libc/stdio/fgetws.c newlib/libc/stdio/fileno.c newlib/libc/stdio/findfp.c newlib/libc/stdio/fprintf.c newlib/libc/stdio/fputc.c newlib/libc/stdio/fputs.c newlib/libc/stdio/fputwc.c newlib/libc/stdio/fputws.c newlib/libc/stdio/fread.c newlib/libc/stdio/fscanf.c newlib/libc/stdio/fwalk.c newlib/libc/stdio/fwrite.c newlib/libc/stdio/getwchar.c newlib/libc/stdio/local.h newlib/libc/stdio/open_memstream.c newlib/libc/stdio/printf.c newlib/libc/stdio/putwchar.c newlib/libc/stdio/scanf.c newlib/libc/stdio/snprintf.c newlib/libc/stdio/sprintf.c newlib/libc/stdio/sscanf.c newlib/libc/stdio/stdio.tex newlib/libc/stdio/vasnprintf.c newlib/libc/stdio/vasprintf.c newlib/libc/stdio/vdprintf.c newlib/libc/stdio/vfprintf.c newlib/libc/stdio/vprintf.c newlib/libc/stdio/vscanf.c newlib/libc/stdio/vsnprintf.c newlib/libc/stdio/vsprintf.c newlib/libc/stdio/vsscanf.c newlib/libc/stdlib/Makefile.am newlib/libc/stdlib/Makefile.in newlib/libc/stdlib/gd_qnan.h newlib/libc/stdlib/ldtoa.c newlib/libc/stdlib/nano-mallocr.c newlib/libc/stdlib/strtod.c newlib/libc/stdlib/strtold.c newlib/libc/string/local.h newlib/libc/string/memccpy.c newlib/libc/string/memchr.c newlib/libc/string/memrchr.c newlib/libc/string/memset.c newlib/libc/string/rawmemchr.c newlib/libc/string/strcasestr.c newlib/libc/string/strerror.c newlib/libc/string/u_strerr.c newlib/libc/sys/a29khif/configure newlib/libc/sys/arc/configure newlib/libc/sys/arm/configure newlib/libc/sys/arm/syscalls.c newlib/libc/sys/configure newlib/libc/sys/configure.in newlib/libc/sys/d10v/configure newlib/libc/sys/decstation/configure newlib/libc/sys/epiphany/configure newlib/libc/sys/h8300hms/configure newlib/libc/sys/h8500hms/configure newlib/libc/sys/linux/configure newlib/libc/sys/linux/dl/atomicity.h newlib/libc/sys/linux/dl/dynamic-link.h newlib/libc/sys/linux/dl/ldsodefs.h newlib/libc/sys/linux/iconv/gconv_charset.h newlib/libc/sys/linux/include/resolv.h newlib/libc/sys/linux/libc-symbols.h newlib/libc/sys/linux/linuxthreads/configure newlib/libc/sys/linux/linuxthreads/internals.h newlib/libc/sys/linux/linuxthreads/libc-symbols.h newlib/libc/sys/linux/linuxthreads/machine/configure newlib/libc/sys/linux/linuxthreads/machine/i386/configure newlib/libc/sys/linux/machine/configure newlib/libc/sys/linux/machine/i386/configure newlib/libc/sys/linux/machine/i386/dl-machine.h newlib/libc/sys/linux/machine/i386/dl-procinfo.h newlib/libc/sys/linux/machine/i386/weakalias.h newlib/libc/sys/linux/shared.ld newlib/libc/sys/linux/sys/unistd.h newlib/libc/sys/m88kbug/configure newlib/libc/sys/mmixware/configure newlib/libc/sys/netware/configure newlib/libc/sys/rdos/configure newlib/libc/sys/rtems/configure newlib/libc/sys/rtems/sys/cpuset.h newlib/libc/sys/rtems/sys/syslimits.h newlib/libc/sys/sh/configure newlib/libc/sys/sparc64/configure newlib/libc/sys/sun4/configure newlib/libc/sys/sysmec/configure newlib/libc/sys/sysnec810/configure newlib/libc/sys/sysnecv850/configure newlib/libc/sys/sysvi386/configure newlib/libc/sys/sysvnecv70/configure newlib/libc/sys/tic80/configure newlib/libc/sys/w65/configure newlib/libc/sys/z8ksim/configure newlib/libc/time/Makefile.am newlib/libc/time/Makefile.in newlib/libc/time/clock.c newlib/libc/time/gmtime_r.c newlib/libc/time/lcltime_r.c newlib/libc/time/local.h newlib/libc/time/mktm_r.c newlib/libc/time/strftime.c newlib/libc/time/strptime.c newlib/libc/unix/getcwd.c newlib/libm/common/Makefile.am newlib/libm/common/Makefile.in newlib/libm/common/s_nan.c newlib/libm/common/sf_nan.c newlib/libm/complex/complex.tex newlib/libm/configure newlib/libm/libm.texinfo newlib/libm/machine/aarch64/configure newlib/libm/machine/arm/configure newlib/libm/machine/configure newlib/libm/machine/configure.in newlib/libm/machine/i386/configure newlib/libm/machine/spu/configure newlib/libm/math/math.tex newlib/libm/mathfp/sf_numtest.c newlib/newlib.hin Delete: config/mt-nios2-elf libgloss/arm/elf-nano.specs libgloss/mips/abiflags.S libgloss/moxie/moxiebox.ld libgloss/msp430/ciosyscalls.S libgloss/msp430/unlink.c libgloss/nds32/_argv.S libgloss/nds32/_argvlen.S libgloss/nds32/_chdir.S libgloss/nds32/_chmod.S libgloss/nds32/_close.S libgloss/nds32/_exit.S libgloss/nds32/_fstat.S libgloss/nds32/_getpid.S libgloss/nds32/_gettimeofday.S libgloss/nds32/_isatty.S libgloss/nds32/_kill.S libgloss/nds32/_link.S libgloss/nds32/_lseek.S libgloss/nds32/_open.S libgloss/nds32/_read.S libgloss/nds32/_rename.S libgloss/nds32/_sbrk.S libgloss/nds32/_stat.S libgloss/nds32/_system.S libgloss/nds32/_time.S libgloss/nds32/_times.S libgloss/nds32/_unlink.S libgloss/nds32/_utime.S libgloss/nds32/_write.S libgloss/nds32/syscall_error_handler.S libgloss/nds32/vh.h libgloss/or1k/Makefile.in libgloss/or1k/README libgloss/or1k/aclocal.m4 libgloss/or1k/board.h libgloss/or1k/boards/README libgloss/or1k/boards/atlys.S libgloss/or1k/boards/de0_nano.S libgloss/or1k/boards/ml501.S libgloss/or1k/boards/ml509.S libgloss/or1k/boards/optimsoc.S libgloss/or1k/boards/or1ksim-uart.S libgloss/or1k/boards/or1ksim.S libgloss/or1k/boards/ordb1a3pe1500.S libgloss/or1k/boards/ordb2a.S libgloss/or1k/boards/orpsocrefdesign.S libgloss/or1k/boards/tmpl.S libgloss/or1k/boards/tmpl.c libgloss/or1k/caches-asm.S libgloss/or1k/configure libgloss/or1k/configure.in libgloss/or1k/crt0.S libgloss/or1k/exceptions-asm.S libgloss/or1k/exceptions.c libgloss/or1k/impure.c libgloss/or1k/include/or1k-asm.h libgloss/or1k/include/or1k-nop.h libgloss/or1k/include/or1k-support.h libgloss/or1k/interrupts-asm.S libgloss/or1k/interrupts.c libgloss/or1k/mmu-asm.S libgloss/or1k/or1k-internals.h libgloss/or1k/or1k_uart.c libgloss/or1k/or1k_uart.h libgloss/or1k/outbyte.S libgloss/or1k/sbrk.c libgloss/or1k/sync-asm.S libgloss/or1k/syscalls.c libgloss/or1k/timer.c libgloss/or1k/util.c newlib/libc/include/sys/_intsup.h newlib/libc/machine/aarch64/memchr-stub.c newlib/libc/machine/aarch64/memchr.S newlib/libc/machine/aarch64/strchr-stub.c newlib/libc/machine/aarch64/strchr.S newlib/libc/machine/aarch64/strchrnul-stub.c newlib/libc/machine/aarch64/strchrnul.S newlib/libc/machine/aarch64/strcpy-stub.c newlib/libc/machine/aarch64/strcpy.S newlib/libc/machine/aarch64/strrchr-stub.c newlib/libc/machine/aarch64/strrchr.S newlib/libc/machine/arm/acle-compat.h newlib/libc/machine/arm/aeabi_memcpy-armv7a.S newlib/libc/machine/arm/aeabi_memcpy.c newlib/libc/machine/arm/strcmp-arm-tiny.S newlib/libc/machine/arm/strcmp-armv4.S newlib/libc/machine/arm/strcmp-armv4t.S newlib/libc/machine/arm/strcmp-armv6.S newlib/libc/machine/arm/strcmp-armv6m.S newlib/libc/machine/arm/strcmp-armv7.S newlib/libc/machine/arm/strcmp-armv7m.S newlib/libc/machine/mips/strcmp.S newlib/libc/machine/or1k/Makefile.am newlib/libc/machine/or1k/Makefile.in newlib/libc/machine/or1k/aclocal.m4 newlib/libc/machine/or1k/configure newlib/libc/machine/or1k/configure.in newlib/libc/machine/or1k/setjmp.S newlib/libc/search/bsd_qsort_r.c newlib/libc/search/qsort_r.c newlib/libc/stdio/clearerr_u.c newlib/libc/stdio/feof_u.c newlib/libc/stdio/ferror_u.c newlib/libc/stdio/fflush_u.c newlib/libc/stdio/fgetc_u.c newlib/libc/stdio/fgets_u.c newlib/libc/stdio/fgetwc_u.c newlib/libc/stdio/fgetws_u.c newlib/libc/stdio/fileno_u.c newlib/libc/stdio/fputc_u.c newlib/libc/stdio/fputs_u.c newlib/libc/stdio/fputwc_u.c newlib/libc/stdio/fputws_u.c newlib/libc/stdio/fread_u.c newlib/libc/stdio/fsetlocking.c newlib/libc/stdio/fwrite_u.c newlib/libc/stdio/getwc_u.c newlib/libc/stdio/getwchar_u.c newlib/libc/stdio/nano-vfprintf.c newlib/libc/stdio/nano-vfprintf_float.c newlib/libc/stdio/nano-vfprintf_i.c newlib/libc/stdio/nano-vfprintf_local.h newlib/libc/stdio/nano-vfscanf.c newlib/libc/stdio/nano-vfscanf_float.c newlib/libc/stdio/nano-vfscanf_i.c newlib/libc/stdio/nano-vfscanf_local.h newlib/libc/stdio/putwc_u.c newlib/libc/stdio/putwchar_u.c newlib/libc/stdio/stdio_ext.c newlib/libc/stdlib/itoa.c newlib/libc/stdlib/utoa.c newlib/libc/sys/tirtos/Makefile.am newlib/libc/sys/tirtos/Makefile.in newlib/libc/sys/tirtos/aclocal.m4 newlib/libc/sys/tirtos/configure newlib/libc/sys/tirtos/configure.in newlib/libc/sys/tirtos/include/sys/lock.h newlib/libc/sys/tirtos/lock.c newlib/libc/time/month_lengths.c newlib/libc/time/tzcalc_limits.c newlib/libm/common/log2l.c newlib/libm/common/logbl.c newlib/libm/common/nexttoward.c newlib/libm/common/nexttowardf.c newlib/libm/common/nexttowardl.c newlib/libm/machine/nds32/Makefile.am newlib/libm/machine/nds32/Makefile.in newlib/libm/machine/nds32/aclocal.m4 newlib/libm/machine/nds32/configure newlib/libm/machine/nds32/configure.in newlib/libm/machine/nds32/w_sqrt.S newlib/libm/machine/nds32/wf_sqrt.S newlib/testsuite/newlib.stdio/nulprintf.c
Diffstat (limited to 'newlib/libc/machine/arm/aeabi_memcpy-armv7a.S')
-rw-r--r--newlib/libc/machine/arm/aeabi_memcpy-armv7a.S286
1 files changed, 0 insertions, 286 deletions
diff --git a/newlib/libc/machine/arm/aeabi_memcpy-armv7a.S b/newlib/libc/machine/arm/aeabi_memcpy-armv7a.S
deleted file mode 100644
index 53e3330ff..000000000
--- a/newlib/libc/machine/arm/aeabi_memcpy-armv7a.S
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * Copyright (c) 2014 ARM Ltd
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the company may not be used to endorse or promote
- * products derived from this software without specific prior written
- * permission.
- *
- * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "arm_asm.h"
-
-/* NOTE: This ifdef MUST match the one in aeabi_memcpy.c. */
-#if defined (__ARM_ARCH_7A__) && defined (__ARM_FEATURE_UNALIGNED) && \
- (defined (__ARM_NEON__) || !defined (__SOFTFP__))
-
- .syntax unified
- .global __aeabi_memcpy
- .type __aeabi_memcpy, %function
-__aeabi_memcpy:
- /* Assumes that n >= 0, and dst, src are valid pointers.
- If there is at least 8 bytes to copy, use LDRD/STRD.
- If src and dst are misaligned with different offsets,
- first copy byte by byte until dst is aligned,
- and then copy using LDRD/STRD and shift if needed.
- When less than 8 left, copy a word and then byte by byte. */
-
- /* Save registers (r0 holds the return value):
- optimized push {r0, r4, r5, lr}.
- To try and improve performance, stack layout changed,
- i.e., not keeping the stack looking like users expect
- (highest numbered register at highest address). */
- push {r0, lr}
- strd r4, r5, [sp, #-8]!
-
- /* Get copying of tiny blocks out of the way first. */
- /* Is there at least 4 bytes to copy? */
- subs r2, r2, #4
- blt copy_less_than_4 /* If n < 4. */
-
- /* Check word alignment. */
- ands ip, r0, #3 /* ip = last 2 bits of dst. */
- bne dst_not_word_aligned /* If dst is not word-aligned. */
-
- /* Get here if dst is word-aligned. */
- ands ip, r1, #3 /* ip = last 2 bits of src. */
- bne src_not_word_aligned /* If src is not word-aligned. */
-word_aligned:
- /* Get here if source and dst both are word-aligned.
- The number of bytes remaining to copy is r2+4. */
-
- /* Is there is at least 64 bytes to copy? */
- subs r2, r2, #60
- blt copy_less_than_64 /* If r2 + 4 < 64. */
-
- /* First, align the destination buffer to 8-bytes,
- to make sure double loads and stores don't cross cache line boundary,
- as they are then more expensive even if the data is in the cache
- (require two load/store issue cycles instead of one).
- If only one of the buffers is not 8-bytes aligned,
- then it's more important to align dst than src,
- because there is more penalty for stores
- than loads that cross cacheline boundary.
- This check and realignment are only worth doing
- if there is a lot to copy. */
-
- /* Get here if dst is word aligned,
- i.e., the 2 least significant bits are 0.
- If dst is not 2w aligned (i.e., the 3rd bit is not set in dst),
- then copy 1 word (4 bytes). */
- ands r3, r0, #4
- beq two_word_aligned /* If dst already two-word aligned. */
- ldr r3, [r1], #4
- str r3, [r0], #4
- subs r2, r2, #4
- blt copy_less_than_64
-
-two_word_aligned:
- /* TODO: Align to cacheline (useful for PLD optimization). */
-
- /* Every loop iteration copies 64 bytes. */
-1:
- .irp offset, #0, #8, #16, #24, #32, #40, #48, #56
- ldrd r4, r5, [r1, \offset]
- strd r4, r5, [r0, \offset]
- .endr
-
- add r0, r0, #64
- add r1, r1, #64
- subs r2, r2, #64
- bge 1b /* If there is more to copy. */
-
-copy_less_than_64:
-
- /* Get here if less than 64 bytes to copy, -64 <= r2 < 0.
- Restore the count if there is more than 7 bytes to copy. */
- adds r2, r2, #56
- blt copy_less_than_8
-
- /* Copy 8 bytes at a time. */
-2:
- ldrd r4, r5, [r1], #8
- strd r4, r5, [r0], #8
- subs r2, r2, #8
- bge 2b /* If there is more to copy. */
-
-copy_less_than_8:
-
- /* Get here if less than 8 bytes to copy, -8 <= r2 < 0.
- Check if there is more to copy. */
- cmn r2, #8
- beq return /* If r2 + 8 == 0. */
-
- /* Restore the count if there is more than 3 bytes to copy. */
- adds r2, r2, #4
- blt copy_less_than_4
-
- /* Copy 4 bytes. */
- ldr r3, [r1], #4
- str r3, [r0], #4
-
-copy_less_than_4:
- /* Get here if less than 4 bytes to copy, -4 <= r2 < 0. */
-
- /* Restore the count, check if there is more to copy. */
- adds r2, r2, #4
- beq return /* If r2 == 0. */
-
- /* Get here with r2 is in {1,2,3}={01,10,11}. */
- /* Logical shift left r2, insert 0s, update flags. */
- lsls r2, r2, #31
-
- /* Copy byte by byte.
- Condition ne means the last bit of r2 is 0.
- Condition cs means the second to last bit of r2 is set,
- i.e., r2 is 1 or 3. */
- itt ne
- ldrbne r3, [r1], #1
- strbne r3, [r0], #1
-
- itttt cs
- ldrbcs r4, [r1], #1
- ldrbcs r5, [r1]
- strbcs r4, [r0], #1
- strbcs r5, [r0]
-
-return:
- /* Restore registers: optimized pop {r0, r4, r5, pc} */
- ldrd r4, r5, [sp], #8
- pop {r0, pc} /* This is the only return point of memcpy. */
-
-dst_not_word_aligned:
-
- /* Get here when dst is not aligned and ip has the last 2 bits of dst,
- i.e., ip is the offset of dst from word.
- The number of bytes that remains to copy is r2 + 4,
- i.e., there are at least 4 bytes to copy.
- Write a partial word (0 to 3 bytes), such that dst becomes
- word-aligned. */
-
- /* If dst is at ip bytes offset from a word (with 0 < ip < 4),
- then there are (4 - ip) bytes to fill up to align dst to the next
- word. */
- rsb ip, ip, #4 /* ip = #4 - ip. */
- cmp ip, #2
-
- /* Copy byte by byte with conditionals. */
- itt gt
- ldrbgt r3, [r1], #1
- strbgt r3, [r0], #1
-
- itt ge
- ldrbge r4, [r1], #1
- strbge r4, [r0], #1
-
- ldrb lr, [r1], #1
- strb lr, [r0], #1
-
- /* Update the count.
- ip holds the number of bytes we have just copied. */
- subs r2, r2, ip /* r2 = r2 - ip. */
- blt copy_less_than_4 /* If r2 < ip. */
-
- /* Get here if there are more than 4 bytes to copy.
- Check if src is aligned. If beforehand src and dst were not word
- aligned but congruent (same offset), then now they are both
- word-aligned, and we can copy the rest efficiently (without
- shifting). */
- ands ip, r1, #3 /* ip = last 2 bits of src. */
- beq word_aligned /* If r1 is word-aligned. */
-
-src_not_word_aligned:
- /* Get here when src is not word-aligned, but dst is word-aligned.
- The number of bytes that remains to copy is r2+4. */
-
- /* Copy word by word using LDR when alignment can be done in hardware,
- i.e., SCTLR.A is set, supporting unaligned access in LDR and STR. */
- subs r2, r2, #60
- blt 8f
-
-7:
- /* Copy 64 bytes in every loop iteration. */
- .irp offset, #0, #4, #8, #12, #16, #20, #24, #28, #32, #36, #40, #44, #48, #52, #56, #60
- ldr r3, [r1, \offset]
- str r3, [r0, \offset]
- .endr
-
- add r0, r0, #64
- add r1, r1, #64
- subs r2, r2, #64
- bge 7b
-
-8:
- /* Get here if less than 64 bytes to copy, -64 <= r2 < 0.
- Check if there is more than 3 bytes to copy. */
- adds r2, r2, #60
- blt copy_less_than_4
-
-9:
- /* Get here if there is less than 64 but at least 4 bytes to copy,
- where the number of bytes to copy is r2+4. */
- ldr r3, [r1], #4
- str r3, [r0], #4
- subs r2, r2, #4
- bge 9b
-
- b copy_less_than_4
-
-
- .syntax unified
- .global __aeabi_memcpy4
- .type __aeabi_memcpy4, %function
-__aeabi_memcpy4:
- /* Assumes that both of its arguments are 4-byte aligned. */
-
- push {r0, lr}
- strd r4, r5, [sp, #-8]!
-
- /* Is there at least 4 bytes to copy? */
- subs r2, r2, #4
- blt copy_less_than_4 /* If n < 4. */
-
- bl word_aligned
-
- .syntax unified
- .global __aeabi_memcpy8
- .type __aeabi_memcpy8, %function
-__aeabi_memcpy8:
- /* Assumes that both of its arguments are 8-byte aligned. */
-
- push {r0, lr}
- strd r4, r5, [sp, #-8]!
-
- /* Is there at least 4 bytes to copy? */
- subs r2, r2, #4
- blt copy_less_than_4 /* If n < 4. */
-
- /* Is there at least 8 bytes to copy? */
- subs r2, r2, #4
- blt copy_less_than_8 /* If n < 8. */
-
- /* Is there at least 64 bytes to copy? */
- subs r2, r2, #56
- blt copy_less_than_64 /* if n + 8 < 64. */
-
- bl two_word_aligned
-
-#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 13:21:31 +0300