diff options
author | Anton Kolesov <Anton.Kolesov@synopsys.com> | 2015-10-23 21:24:50 +0300 |
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committer | Corinna Vinschen <corinna@vinschen.de> | 2015-11-12 16:14:17 +0300 |
commit | c0a99f02933e1e58197e61d0b2c6e0b3824a2119 (patch) | |
tree | 62baf46db6e25fb589f83cb1b2aabd945f9b32ca /newlib/libc/machine/arc/strncpy.S | |
parent | acdfcb0a0af54715bc37ed1c767bfe901b679357 (diff) |
Add support for ARC to newlib
newlib/ChangeLog:
2015-11-12 Anton Kolesov <Anton.Kolesov@synopsys.com>
* configure.host: Add ARC support.
* libc/include/machine/setjmp.h: Likewise.
* libc/machine/configure: Likewise.
* libc/machine/configure.in: Likewise.
* libc/machine/arc/Makefile.am: Likewise.
* libc/machine/arc/Makefile.in: Likewise.
* libc/machine/arc/aclocal.m4: Likewise.
* libc/machine/arc/asm.h: Likewise.
* libc/machine/arc/configure: Likewise.
* libc/machine/arc/configure.in: Likewise.
* libc/machine/arc/memcmp-bs-norm.S: Likewise.
* libc/machine/arc/memcmp-stub.c: Likewise.
* libc/machine/arc/memcmp.S: Likewise.
* libc/machine/arc/memcpy-archs.S: Likewise.
* libc/machine/arc/memcpy-bs.S: Likewise.
* libc/machine/arc/memcpy-stub.c: Likewise.
* libc/machine/arc/memcpy.S: Likewise.
* libc/machine/arc/memset-archs.S: Likewise.
* libc/machine/arc/memset-bs.S: Likewise.
* libc/machine/arc/memset-stub.c: Likewise.
* libc/machine/arc/memset.S: Likewise.
* libc/machine/arc/setjmp.S: Likewise.
* libc/machine/arc/strchr-bs-norm.S: Likewise.
* libc/machine/arc/strchr-bs.S: Likewise.
* libc/machine/arc/strchr-stub.c: Likewise.
* libc/machine/arc/strchr.S: Likewise.
* libc/machine/arc/strcmp-archs.S: Likewise.
* libc/machine/arc/strcmp-stub.c: Likewise.
* libc/machine/arc/strcmp.S: Likewise.
* libc/machine/arc/strcpy-bs-arc600.S: Likewise.
* libc/machine/arc/strcpy-bs.S: Likewise.
* libc/machine/arc/strcpy-stub.c: Likewise.
* libc/machine/arc/strcpy.S: Likewise.
* libc/machine/arc/strlen-bs-norm.S: Likewise.
* libc/machine/arc/strlen-bs.S: Likewise.
* libc/machine/arc/strlen-stub.c: Likewise.
* libc/machine/arc/strlen.S: Likewise.
* libc/machine/arc/strncpy-bs.S: Likewise.
* libc/machine/arc/strncpy-stub.c: Likewise.
* libc/machine/arc/strncpy.S: Likewise.
Diffstat (limited to 'newlib/libc/machine/arc/strncpy.S')
-rw-r--r-- | newlib/libc/machine/arc/strncpy.S | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/newlib/libc/machine/arc/strncpy.S b/newlib/libc/machine/arc/strncpy.S new file mode 100644 index 000000000..9e2266b82 --- /dev/null +++ b/newlib/libc/machine/arc/strncpy.S @@ -0,0 +1,134 @@ +/* + Copyright (c) 2015, Synopsys, Inc. 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) Neither the name of the Synopsys, Inc., 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. +*/ + +/* This implementation is optimized for performance. For code size a generic + implementation of this function from newlib/libc/string/strncpy.c will be + used. */ +#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) + +#include "asm.h" + +/* If dst and src are 4 byte aligned, copy 8 bytes at a time. + If the src is 4, but not 8 byte aligned, we first read 4 bytes to get + it 8 byte aligned. Thus, we can do a little read-ahead, without + dereferencing a cache line that we should not touch. */ + +#if defined (__ARC601__) || !defined (__Xbarrel_shifter) + +#define BRand(a,b,l) and a,a,b ` brne_s a,0,l + +ENTRY (strncpy) + cmp_s r2,8 + or r12,r0,r1 + bmsk.cc.f r12,r12,1 + brne.d r12,0,.Lbytewise + mov_s r10,r0 + ld_s r3,[r1,0] + mov r8,0x01010101 + add r6,r0,r2 + sub r6,r6,8 + bbit0.d r1,2,.Loop_start + ror r11,r8 + sub r12,r3,r8 + bic_l r12,r12,r3 + BRand (r12,r11,.Lr3z) + mov_s r4,r3 + ld.a r3,[r1,4] + st.ab r4,[r10,4] + .balign 4 +.Loop_start: + brhs r10,r6,.Loop_end +1: + ld.a r4,[r1,4] + sub r12,r3,r8 + bic_s r12,r12,r3 + BRand (r12,r11,.Lr3z2) + st.ab r3,[r10,8] + sub r12,r4,r8 + bic r12,r12,r4 + BRand (r12,r11,.Lr4z) + ld.a r3,[r1,4] + brlo.d r10,r6,1b + st r4,[r10,-4] +.Loop_end: + add r6,r6,4 + brhs r10,r6,.Lastword + sub r12,r3,r8 + bic_s r12,r12,r3 + BRand (r12,r11,.Lr3z) + add_s r1,r1,4 + st.ab r3,[r10,4] +.Lastword: + sub_s r2,r2,1 + b.d .Lstart_charloop + bmsk.f r2,r2,1 + + .balign 4 + nop_s +.Lr3z2: sub_s r1,r1,4 +.Lr4z: +.Lr3z: + .balign 4 +.Lr3z_loop: + ldb.ab r3,[r1,1] + brne.d r3,0,.Lr3z_loop + stb.ab r3,[r10,1] + +.Lzero_rest: + ; __strncpy_bzero requires: + ; return value in r0 + ; zeroing length in r2 + ; zeroing start address in r3 + mov_s r3,r10 + add_s r2,r2,r0 + b.d __strncpy_bzero + sub_s r2,r2,r3 + + .balign 4 +.Lbytewise: + sub.f r2,r2,1 + jcs [blink] +.Lstart_charloop: + mov_s r3,r10 +.Lcharloop: + ldb.ab r12,[r1,1] + beq.d .Last_byte + sub.f r2,r2,1 + brne.d r12,0,.Lcharloop + stb.ab r12,[r3,1] + b.d __strncpy_bzero + stb.ab r12,[r3,1] +.Last_byte: + j_s.d [blink] + stb_s r12,[r3] +ENDFUNC (strncpy) +#endif /* __ARC601__ || !__Xbarrel_shifter */ + +#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |