diff options
Diffstat (limited to 'newlib/libc/machine/arc/memset-bs.S')
| -rw-r--r-- | newlib/libc/machine/arc/memset-bs.S | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/newlib/libc/machine/arc/memset-bs.S b/newlib/libc/machine/arc/memset-bs.S new file mode 100644 index 0000000..3c91ae3 --- /dev/null +++ b/newlib/libc/machine/arc/memset-bs.S @@ -0,0 +1,154 @@ +/* + 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/memset.c will be + used. */ +#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) + +#include "asm.h" + +/* ARC HS has it's own implementation of memset, yet we want this function + still to be compiled under "__dummy_memset" disguise, because strncpy + function uses __strncpy_bzero as a second entry point into memset. Would be + better to add __strncpy_bzero label to memset for ARC HS though, and even + better would be to avoid a second entry point into function. ARC HS always + has barrel-shifter, so this implementation will be always used for this + purpose. */ +#if !defined (__ARC601__) && defined (__Xbarrel_shifter) + +/* To deal with alignment/loop issues, SMALL must be at least 2. */ +#define SMALL 7 + + .global __strncpy_bzero + .hidden __strncpy_bzero +/* __strncpy_bzero provides the following interface to strncpy: + r0: return value + r2: zeroing length + r3: zeroing start address + No attempt is made here for __strncpy_memset to speed up aligned + cases, because the copying of a string presumably leaves start address + and length alignment for the zeroing randomly distributed. */ + +#ifdef __HS__ +ENTRY (__dummy_memset) +#else +ENTRY (memset) +#endif +#if !defined (__ARC700__) && !defined (__EM__) +#undef SMALL +#define SMALL 8 /* Even faster if aligned. */ + brls.d r2,SMALL,.Ltiny +#endif + mov_s r3,r0 + or r12,r0,r2 + bmsk.f r12,r12,1 + extb_s r1,r1 + asl r12,r1,8 + beq.d .Laligned + or_s r1,r1,r12 +#if defined (__ARC700__) || defined (__EM__) + brls r2,SMALL,.Ltiny +#endif +.Lnot_tiny: + add_s r12,r2,r0 + stb r1,[r12,-1] + bclr_l r12,r12,0 + stw r1,[r12,-2] + bmsk.f r12,r3,1 + add_s r2,r2,r12 + sub.ne r2,r2,4 + stb.ab r1,[r3,1] + bclr_s r3,r3,0 + stw.ab r1,[r3,2] + bclr_s r3,r3,1 +.Laligned: ; This code address should be aligned for speed. +#if defined (__ARC700__) || defined (__EM__) + asl r12,r1,16 + lsr.f lp_count,r2,2 + or_s r1,r1,r12 + lpne .Loop_end + st.ab r1,[r3,4] +.Loop_end: + j_s [blink] +#else /* !__ARC700 */ + lsr.f lp_count,r2,3 + asl r12,r1,16 + or_s r1,r1,r12 + lpne .Loop_end + st.ab r1,[r3,4] + st.ab r1,[r3,4] +.Loop_end: + jcc [blink] + j_s.d [blink] + st_s r1,[r3] +#endif /* !__ARC700 */ + +#if defined (__ARC700__) || defined (__EM__) + .balign 4 +__strncpy_bzero: + brhi.d r2,17,.Lnot_tiny + mov_l r1,0 +.Ltiny: + mov.f lp_count,r2 + lpne .Ltiny_end + stb.ab r1,[r3,1] +.Ltiny_end: + j_s [blink] +#else /* !__ARC700__ */ +#if SMALL > 8 +FIXME +#endif + .balign 4 +__strncpy_bzero: + brhi.d r2,8,.Lnot_tiny + mov_s r1,0 +.Ltiny: + sub_s r2,r2,11 + sub1 r12,pcl,r2 + j_s [r12] + stb_s r1,[r3,7] + stb_s r1,[r3,6] + stb_s r1,[r3,5] + stb_s r1,[r3,4] + stb_s r1,[r3,3] + stb_s r1,[r3,2] + stb_s r1,[r3,1] + stb_s r1,[r3] + j_s [blink] +#endif /* !__ARC700 */ +#ifdef __HS__ +ENDFUNC (__dummy_memset) +#else +ENDFUNC (memset) +#endif +#endif /* !__ARC601__ && __Xbarrel_shifter */ + +#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |