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Diffstat (limited to 'newlib/libc/machine/cris/memcpy.c')
| -rw-r--r-- | newlib/libc/machine/cris/memcpy.c | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/newlib/libc/machine/cris/memcpy.c b/newlib/libc/machine/cris/memcpy.c deleted file mode 100644 index c7bd6ebdc..000000000 --- a/newlib/libc/machine/cris/memcpy.c +++ /dev/null @@ -1,236 +0,0 @@ -/* A memcpy for CRIS. - Copyright (C) 1994-2005 Axis Communications. - 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. Neither the name of Axis Communications 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 AXIS COMMUNICATIONS AND ITS 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 AXIS - COMMUNICATIONS OR ITS 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. */ - -/* FIXME: This file should really only be used for reference, as the - result is somewhat depending on gcc generating what we expect rather - than what we describe. An assembly file should be used instead. */ - -#include <stddef.h> - -/* Break even between movem and move16 is really at 38.7 * 2, but - modulo 44, so up to the next multiple of 44, we use ordinary code. */ -#define MEMCPY_BY_BLOCK_THRESHOLD (44 * 2) - -/* No name ambiguities in this file. */ -__asm__ (".syntax no_register_prefix"); - -void * -memcpy(void *pdst, const void *psrc, size_t pn) -{ - /* Now we want the parameters put in special registers. - Make sure the compiler is able to make something useful of this. - As it is now: r10 -> r13; r11 -> r11 (nop); r12 -> r12 (nop). - - If gcc was allright, it really would need no temporaries, and no - stack space to save stuff on. */ - - register void *return_dst __asm__ ("r10") = pdst; - register unsigned char *dst __asm__ ("r13") = pdst; - register unsigned const char *src __asm__ ("r11") = psrc; - register int n __asm__ ("r12") = pn; - - /* When src is aligned but not dst, this makes a few extra needless - cycles. I believe it would take as many to check that the - re-alignment was unnecessary. */ - if (((unsigned long) dst & 3) != 0 - /* Don't align if we wouldn't copy more than a few bytes; so we - don't have to check further for overflows. */ - && n >= 3) - { - if ((unsigned long) dst & 1) - { - n--; - *dst = *src; - src++; - dst++; - } - - if ((unsigned long) dst & 2) - { - n -= 2; - *(short *) dst = *(short *) src; - src += 2; - dst += 2; - } - } - - /* Decide which copying method to use. */ - if (n >= MEMCPY_BY_BLOCK_THRESHOLD) - { - /* It is not optimal to tell the compiler about clobbering any - registers; that will move the saving/restoring of those registers - to the function prologue/epilogue, and make non-movem sizes - suboptimal. */ - __asm__ volatile - ("\ - ;; GCC does promise correct register allocations, but let's \n\ - ;; make sure it keeps its promises. \n\ - .ifnc %0-%1-%2,$r13-$r11-$r12 \n\ - .error \"GCC reg alloc bug: %0-%1-%4 != $r13-$r12-$r11\" \n\ - .endif \n\ - \n\ - ;; Save the registers we'll use in the movem process \n\ - ;; on the stack. \n\ - subq 11*4,sp \n\ - movem r10,[sp] \n\ - \n\ - ;; Now we've got this: \n\ - ;; r11 - src \n\ - ;; r13 - dst \n\ - ;; r12 - n \n\ - \n\ - ;; Update n for the first loop. \n\ - subq 44,r12 \n\ -0: \n\ -" -#ifdef __arch_common_v10_v32 - /* Cater to branch offset difference between v32 and v10. We - assume the branch below has an 8-bit offset. */ -" setf\n" -#endif -" movem [r11+],r10 \n\ - subq 44,r12 \n\ - bge 0b \n\ - movem r10,[r13+] \n\ - \n\ - ;; Compensate for last loop underflowing n. \n\ - addq 44,r12 \n\ - \n\ - ;; Restore registers from stack. \n\ - movem [sp+],r10" - - /* Outputs. */ - : "=r" (dst), "=r" (src), "=r" (n) - - /* Inputs. */ - : "0" (dst), "1" (src), "2" (n)); - } - - while (n >= 16) - { - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - - n -= 16; - } - - switch (n) - { - case 0: - break; - - case 1: - *dst = *src; - break; - - case 2: - *(short *) dst = *(short *) src; - break; - - case 3: - *(short *) dst = *(short *) src; dst += 2; src += 2; - *dst = *src; - break; - - case 4: - *(long *) dst = *(long *) src; - break; - - case 5: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *dst = *src; - break; - - case 6: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; - break; - - case 7: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; dst += 2; src += 2; - *dst = *src; - break; - - case 8: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; - break; - - case 9: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *dst = *src; - break; - - case 10: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; - break; - - case 11: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; dst += 2; src += 2; - *dst = *src; - break; - - case 12: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; - break; - - case 13: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *dst = *src; - break; - - case 14: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; - break; - - case 15: - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(long *) dst = *(long *) src; dst += 4; src += 4; - *(short *) dst = *(short *) src; dst += 2; src += 2; - *dst = *src; - break; - } - - return return_dst; -} |