diff options
Diffstat (limited to 'REORG.TODO/sysdeps/sh/memcpy.S')
| -rw-r--r-- | REORG.TODO/sysdeps/sh/memcpy.S | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sh/memcpy.S b/REORG.TODO/sysdeps/sh/memcpy.S new file mode 100644 index 0000000000..c13afeaf24 --- /dev/null +++ b/REORG.TODO/sysdeps/sh/memcpy.S @@ -0,0 +1,198 @@ +/* Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Kazumoto Kojima <kkojima@rr.iij4u.or.jp> + Optimized by Toshiyasu Morita <toshiyasu.morita@hsa.hitachi.com> + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* void *memcpy(void *dst, const void *src, size_t n); + No overlap between the memory of DST and of SRC are assumed. */ + +ENTRY(memcpy) + mov r4,r3 /* Save destination. */ + + /* If less than 11 bytes, just do a byte copy. */ + mov #11,r0 + cmp/gt r6,r0 + bt L_byteloop_init + + /* Check if we need to word-align source. */ + mov r5,r0 + tst #1,r0 + bt L_wordalign + + mov.b @r0+,r1 /* Copy one byte. */ + add #-1,r6 + mov.b r1,@r4 + add #1,r4 + + .balignw 4,0x0009 +L_wordalign: + /* Check if we need to longword-align source. */ + tst #2,r0 + bt L_copy + + mov.w @r0+,r1 /* Copy one word. */ + add #-2,r6 +#ifdef __BIG_ENDIAN__ + add #1,r4 + mov.b r1,@r4 + shlr8 r1 + mov.b r1,@-r4 + add #2,r4 +#else + mov.b r1,@r4 + add #1,r4 + shlr8 r1 + mov.b r1,@r4 + add #1,r4 +#endif +L_copy: + mov r0,r5 + + /* Calculate the correct routine to handle the destination + alignment and simultaneously calculate the loop counts for + both the 2 word copy loop and byte copy loop. */ + mova L_jumptable,r0 + mov r0,r1 + mov r4,r0 + mov r6,r7 + and #3,r0 + shlr2 r7 + shll r0 + shlr r7 + mov.w @(r0,r1),r2 + mov #7,r0 + braf r2 + and r0,r6 +L_base: + + .balign 4 +L_jumptable: + .word L_copydest0 - L_base + .word L_copydest1_or_3 - L_base + .word L_copydest2 - L_base + .word L_copydest1_or_3 - L_base + + .balign 4 + /* Copy routine for (dest mod 4) == 1 or == 3. */ +L_copydest1_or_3: + add #-1,r4 + .balignw 4,0x0009 +L_copydest1_or_3_loop: + mov.l @r5+,r0 /* Read first longword. */ + dt r7 + mov.l @r5+,r1 /* Read second longword. */ +#ifdef __BIG_ENDIAN__ + /* Write first longword as byte, word, byte. */ + mov.b r0,@(4,r4) + shlr8 r0 + mov.w r0,@(2,r4) + shlr16 r0 + mov.b r0,@(1,r4) + mov r1,r0 + /* Write second longword as byte, word, byte. */ + mov.b r0,@(8,r4) + shlr8 r0 + mov.w r0,@(6,r4) + shlr16 r0 + mov.b r0,@(5,r4) +#else + /* Write first longword as byte, word, byte. */ + mov.b r0,@(1,r4) + shlr8 r0 + mov.w r0,@(2,r4) + shlr16 r0 + mov.b r0,@(4,r4) + mov r1,r0 + /* Write second longword as byte, word, byte. */ + mov.b r0,@(5,r4) + shlr8 r0 + mov.w r0,@(6,r4) + shlr16 r0 + mov.b r0,@(8,r4) +#endif + bf/s L_copydest1_or_3_loop + add #8,r4 + + bra L_byteloop_init + add #1,r4 + + .balign 4 + /* Copy routine for (dest mod 4) == 2. */ +L_copydest2: +L_copydest2_loop: + mov.l @r5+,r0 + dt r7 + mov.l @r5+,r1 +#ifdef __BIG_ENDIAN__ + mov.w r0,@(2,r4) + shlr16 r0 + mov.w r0,@r4 + mov r1,r0 + mov.w r0,@(6,r4) + shlr16 r0 + mov.w r0,@(4,r4) +#else + mov.w r0,@r4 + shlr16 r0 + mov.w r0,@(2,r4) + mov r1,r0 + mov.w r0,@(4,r4) + shlr16 r0 + mov.w r0,@(6,r4) +#endif + bf/s L_copydest2_loop + add #8,r4 + + bra L_byteloop_init + nop + + .balign 4 + /* Copy routine for (dest mod 4) == 0. */ +L_copydest0: + add #-8,r4 + .balignw 4,0x0009 +L_copydest0_loop: + mov.l @r5+,r0 + dt r7 + mov.l @r5+,r1 + add #8,r4 + mov.l r0,@r4 + bf/s L_copydest0_loop + mov.l r1,@(4,r4) + + add #8,r4 /* Fall through. */ + +L_byteloop_init: + tst r6,r6 + bt L_exit + + .balignw 4,0x0009 + /* Copy remaining bytes. */ +L_byteloop: + mov.b @r5+,r0 + dt r6 + mov.b r0,@r4 + bf/s L_byteloop + add #1,r4 + +L_exit: + rts + mov r3,r0 /* Return destination. */ +END(memcpy) +libc_hidden_builtin_def (memcpy) |