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authorcvs2svn <>2013-04-22 21:11:24 +0400
committercvs2svn <>2013-04-22 21:11:24 +0400
commitb17fa496b4c701892d94426b92106f3410b75baf (patch)
tree4709d59cd1267948e95c376e63313341c844d3f1 /newlib/libc/machine/aarch64/strncmp.S
parentc82eac05c783fa1cb82eac9216dab1ed8aa482ae (diff)
This commit was manufactured by cvs2svn to create tag 'cygwin-cygwin-1_7_18-release
1_7_18-release'. Sprout from cygwin-64bit-premerge-branch 2013-04-22 17:11:23 UTC cvs2svn 'This commit was manufactured by cvs2svn to create branch 'cygwin-64bit-' Cherrypick from master 2013-04-16 10:25:16 UTC Corinna Vinschen <corinna@vinschen.de> ' * libc/sys/rtems/sys/queue.h: Delete file.': ChangeLog Makefile.def Makefile.in configure newlib/ChangeLog newlib/libc/include/sys/cdefs.h newlib/libc/include/sys/features.h newlib/libc/search/hash.c winsup/cygwin/ChangeLog winsup/cygwin/include/cygwin/version.h winsup/cygwin/include/sys/queue.h winsup/cygwin/include/sys/sysinfo.h winsup/cygwin/libc/fts.c winsup/cygwin/regex/regexec.c Cherrypick from master 2009-12-16 18:28:15 UTC Jeff Johnston <jjohnstn@redhat.com> '': newlib/libc/sys/rtems/sys/queue.h Delete: COPYING3 COPYING3.LIB config.rpath configure.ac ltgcc.m4 newlib/libc/machine/aarch64/Makefile.am newlib/libc/machine/aarch64/Makefile.in newlib/libc/machine/aarch64/aclocal.m4 newlib/libc/machine/aarch64/configure newlib/libc/machine/aarch64/configure.in newlib/libc/machine/aarch64/memcmp-stub.c newlib/libc/machine/aarch64/memcmp.S newlib/libc/machine/aarch64/memcpy-stub.c newlib/libc/machine/aarch64/memcpy.S newlib/libc/machine/aarch64/memmove-stub.c newlib/libc/machine/aarch64/memmove.S newlib/libc/machine/aarch64/memset-stub.c newlib/libc/machine/aarch64/memset.S newlib/libc/machine/aarch64/setjmp.S newlib/libc/machine/aarch64/strcmp-stub.c newlib/libc/machine/aarch64/strcmp.S newlib/libc/machine/aarch64/strlen-stub.c newlib/libc/machine/aarch64/strlen.S newlib/libc/machine/aarch64/strncmp-stub.c newlib/libc/machine/aarch64/strncmp.S newlib/libc/machine/aarch64/strnlen-stub.c newlib/libc/machine/aarch64/strnlen.S newlib/libc/machine/epiphany/Makefile.am newlib/libc/machine/epiphany/Makefile.in newlib/libc/machine/epiphany/aclocal.m4 newlib/libc/machine/epiphany/configure newlib/libc/machine/epiphany/configure.in newlib/libc/machine/epiphany/machine/stdlib.h newlib/libc/machine/epiphany/setjmp.S newlib/libc/sys/epiphany/Makefile.am newlib/libc/sys/epiphany/Makefile.in newlib/libc/sys/epiphany/aclocal.m4 newlib/libc/sys/epiphany/configure newlib/libc/sys/epiphany/configure.in newlib/libc/sys/epiphany/e_printf.c newlib/libm/machine/aarch64/Makefile.am newlib/libm/machine/aarch64/Makefile.in newlib/libm/machine/aarch64/aclocal.m4 newlib/libm/machine/aarch64/configure newlib/libm/machine/aarch64/configure.in newlib/libm/machine/aarch64/s_ceil.c newlib/libm/machine/aarch64/s_floor.c newlib/libm/machine/aarch64/s_fma.c newlib/libm/machine/aarch64/s_fmax.c newlib/libm/machine/aarch64/s_fmin.c newlib/libm/machine/aarch64/s_llrint.c newlib/libm/machine/aarch64/s_llround.c newlib/libm/machine/aarch64/s_lrint.c newlib/libm/machine/aarch64/s_lround.c newlib/libm/machine/aarch64/s_nearbyint.c newlib/libm/machine/aarch64/s_rint.c newlib/libm/machine/aarch64/s_round.c newlib/libm/machine/aarch64/s_trunc.c newlib/libm/machine/aarch64/sf_ceil.c newlib/libm/machine/aarch64/sf_floor.c newlib/libm/machine/aarch64/sf_fma.c newlib/libm/machine/aarch64/sf_fmax.c newlib/libm/machine/aarch64/sf_fmin.c newlib/libm/machine/aarch64/sf_llrint.c newlib/libm/machine/aarch64/sf_llround.c newlib/libm/machine/aarch64/sf_lrint.c newlib/libm/machine/aarch64/sf_lround.c newlib/libm/machine/aarch64/sf_nearbyint.c newlib/libm/machine/aarch64/sf_rint.c newlib/libm/machine/aarch64/sf_round.c newlib/libm/machine/aarch64/sf_trunc.c
Diffstat (limited to 'newlib/libc/machine/aarch64/strncmp.S')
-rw-r--r--newlib/libc/machine/aarch64/strncmp.S228
1 files changed, 0 insertions, 228 deletions
diff --git a/newlib/libc/machine/aarch64/strncmp.S b/newlib/libc/machine/aarch64/strncmp.S
deleted file mode 100644
index 0b90dd8a6..000000000
--- a/newlib/libc/machine/aarch64/strncmp.S
+++ /dev/null
@@ -1,228 +0,0 @@
-/* Copyright (c) 2013, Linaro Limited
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * 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.
- * Neither the name of the Linaro nor the
- names of its contributors may be used to endorse or promote products
- derived from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "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 THE COPYRIGHT
- HOLDER OR CONTRIBUTORS 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. */
-
-#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
-/* See strcmp-stub.c */
-#else
-
-/* Assumptions:
- *
- * ARMv8-a, AArch64
- */
-
- .macro def_fn f p2align=0
- .text
- .p2align \p2align
- .global \f
- .type \f, %function
-\f:
- .endm
-
-#define REP8_01 0x0101010101010101
-#define REP8_7f 0x7f7f7f7f7f7f7f7f
-#define REP8_80 0x8080808080808080
-
-/* Parameters and result. */
-#define src1 x0
-#define src2 x1
-#define limit x2
-#define result x0
-
-/* Internal variables. */
-#define data1 x3
-#define data1w w3
-#define data2 x4
-#define data2w w4
-#define has_nul x5
-#define diff x6
-#define syndrome x7
-#define tmp1 x8
-#define tmp2 x9
-#define tmp3 x10
-#define zeroones x11
-#define pos x12
-#define limit_wd x13
-#define mask x14
-#define endloop x15
-
- .text
- .p2align 6
- .rep 7
- nop /* Pad so that the loop below fits a cache line. */
- .endr
-def_fn strncmp
- cbz limit, .Lret0
- eor tmp1, src1, src2
- mov zeroones, #REP8_01
- tst tmp1, #7
- b.ne .Lmisaligned8
- ands tmp1, src1, #7
- b.ne .Lmutual_align
- /* Calculate the number of full and partial words -1. */
- sub limit_wd, limit, #1 /* limit != 0, so no underflow. */
- lsr limit_wd, limit_wd, #3 /* Convert to Dwords. */
-
- /* NUL detection works on the principle that (X - 1) & (~X) & 0x80
- (=> (X - 1) & ~(X | 0x7f)) is non-zero iff a byte is zero, and
- can be done in parallel across the entire word. */
- /* Start of performance-critical section -- one 64B cache line. */
-.Lloop_aligned:
- ldr data1, [src1], #8
- ldr data2, [src2], #8
-.Lstart_realigned:
- subs limit_wd, limit_wd, #1
- sub tmp1, data1, zeroones
- orr tmp2, data1, #REP8_7f
- eor diff, data1, data2 /* Non-zero if differences found. */
- csinv endloop, diff, xzr, pl /* Last Dword or differences. */
- bics has_nul, tmp1, tmp2 /* Non-zero if NUL terminator. */
- ccmp endloop, #0, #0, eq
- b.eq .Lloop_aligned
- /* End of performance-critical section -- one 64B cache line. */
-
- /* Not reached the limit, must have found the end or a diff. */
- tbz limit_wd, #63, .Lnot_limit
-
- /* Limit % 8 == 0 => all bytes significant. */
- ands limit, limit, #7
- b.eq .Lnot_limit
-
- lsl limit, limit, #3 /* Bits -> bytes. */
- mov mask, #~0
-#ifdef __AARCH64EB__
- lsr mask, mask, limit
-#else
- lsl mask, mask, limit
-#endif
- bic data1, data1, mask
- bic data2, data2, mask
-
- /* Make sure that the NUL byte is marked in the syndrome. */
- orr has_nul, has_nul, mask
-
-.Lnot_limit:
- orr syndrome, diff, has_nul
-
-#ifndef __AARCH64EB__
- rev syndrome, syndrome
- rev data1, data1
- /* The MS-non-zero bit of the syndrome marks either the first bit
- that is different, or the top bit of the first zero byte.
- Shifting left now will bring the critical information into the
- top bits. */
- clz pos, syndrome
- rev data2, data2
- lsl data1, data1, pos
- lsl data2, data2, pos
- /* But we need to zero-extend (char is unsigned) the value and then
- perform a signed 32-bit subtraction. */
- lsr data1, data1, #56
- sub result, data1, data2, lsr #56
- ret
-#else
- /* For big-endian we cannot use the trick with the syndrome value
- as carry-propagation can corrupt the upper bits if the trailing
- bytes in the string contain 0x01. */
- /* However, if there is no NUL byte in the dword, we can generate
- the result directly. We can't just subtract the bytes as the
- MSB might be significant. */
- cbnz has_nul, 1f
- cmp data1, data2
- cset result, ne
- cneg result, result, lo
- ret
-1:
- /* Re-compute the NUL-byte detection, using a byte-reversed value. */
- rev tmp3, data1
- sub tmp1, tmp3, zeroones
- orr tmp2, tmp3, #REP8_7f
- bic has_nul, tmp1, tmp2
- rev has_nul, has_nul
- orr syndrome, diff, has_nul
- clz pos, syndrome
- /* The MS-non-zero bit of the syndrome marks either the first bit
- that is different, or the top bit of the first zero byte.
- Shifting left now will bring the critical information into the
- top bits. */
- lsl data1, data1, pos
- lsl data2, data2, pos
- /* But we need to zero-extend (char is unsigned) the value and then
- perform a signed 32-bit subtraction. */
- lsr data1, data1, #56
- sub result, data1, data2, lsr #56
- ret
-#endif
-
-.Lmutual_align:
- /* Sources are mutually aligned, but are not currently at an
- alignment boundary. Round down the addresses and then mask off
- the bytes that precede the start point.
- We also need to adjust the limit calculations, but without
- overflowing if the limit is near ULONG_MAX. */
- bic src1, src1, #7
- bic src2, src2, #7
- ldr data1, [src1], #8
- neg tmp3, tmp1, lsl #3 /* 64 - bits(bytes beyond align). */
- ldr data2, [src2], #8
- mov tmp2, #~0
- sub limit_wd, limit, #1 /* limit != 0, so no underflow. */
-#ifdef __AARCH64EB__
- /* Big-endian. Early bytes are at MSB. */
- lsl tmp2, tmp2, tmp3 /* Shift (tmp1 & 63). */
-#else
- /* Little-endian. Early bytes are at LSB. */
- lsr tmp2, tmp2, tmp3 /* Shift (tmp1 & 63). */
-#endif
- and tmp3, limit_wd, #7
- lsr limit_wd, limit_wd, #3
- /* Adjust the limit. Only low 3 bits used, so overflow irrelevant. */
- add limit, limit, tmp1
- add tmp3, tmp3, tmp1
- orr data1, data1, tmp2
- orr data2, data2, tmp2
- add limit_wd, limit_wd, tmp3, lsr #3
- b .Lstart_realigned
-
-.Lret0:
- mov result, #0
- ret
-
- .p2align 6
-.Lmisaligned8:
- sub limit, limit, #1
-1:
- /* Perhaps we can do better than this. */
- ldrb data1w, [src1], #1
- ldrb data2w, [src2], #1
- subs limit, limit, #1
- ccmp data1w, #1, #0, cs /* NZCV = 0b0000. */
- ccmp data1w, data2w, #0, cs /* NZCV = 0b0000. */
- b.eq 1b
- sub result, data1, data2
- ret
- .size strncmp, . - strncmp
-
-#endif