diff options
Diffstat (limited to 'sysdeps/sh/memset.S')
| -rw-r--r-- | sysdeps/sh/memset.S | 118 |
1 files changed, 63 insertions, 55 deletions
diff --git a/sysdeps/sh/memset.S b/sysdeps/sh/memset.S index f2120a8515..12199106f2 100644 --- a/sysdeps/sh/memset.S +++ b/sysdeps/sh/memset.S @@ -1,6 +1,7 @@ -/* Copyright (C) 1999, 2000 Free Software Foundation, Inc. +/* Copyright (C) 1999, 2000, 2002 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 @@ -19,61 +20,68 @@ #include <sysdep.h> -/* void *memset (t, c, len) */ +/* void *memset (t, c, len); */ ENTRY(memset) - tst r6, r6 - bt/s end - mov r4, r3 - mov #3, r0 - cmp/hs r6, r0 - bt/s 2f - and r4, r0 - tst r0, r0 - bt/s 1f - add r0, r6 - add #-1, r0 - shll2 r0 - braf r0 - add #-4, r6 - - mov.b r5, @r4 - add #1, r4 - mov.b r5, @r4 - add #1, r4 - mov.b r5, @r4 - add #1, r4 -1: - extu.b r5, r0 - shll8 r5 - or r5, r0 - extu.w r0, r0 - mov r0, r5 - swap.w r5, r5 - or r0, r5 - -2: - add #-4, r6 - cmp/pz r6 - bf afew - mov.l r5, @r4 - bra 2b - add #4, r4 - -afew: - mov #-1, r0 - sub r6, r0 - shll2 r0 - braf r0 - nop - - mov.b r5, @r4 - add #1, r4 - mov.b r5, @r4 - add #1, r4 - mov.b r5, @r4 - add #1, r4 -end: + mov #12,r0 + cmp/gt r6,r0 + bt.s L_byte_loop_init + mov r4,r7 + + swap.b r5,r1 + or r1,r5 + swap.w r5,r1 + or r1,r5 + + mov r4,r0 + tst #1,r0 + bt L_wordalign + + mov.b r5,@r4 + add #-1,r6 + add #1,r4 + mov r4,r0 + + .balignw 4,0x0009 +L_wordalign: + tst #2,r0 + bt L_word_loop_init + + mov.w r5,@r4 + add #-2,r6 + add #2,r4 + mov r4,r0 + + .balignw 4,0x0009 +L_word_loop_init: + mov r6,r3 + shlr2 r3 + mov #7,r0 + shlr r3 + and r0,r6 + + .balignw 4,0x0009 +L_2word_loop: + mov.l r5,@r4 + dt r3 + mov.l r5,@(4,r4) + bf.s L_2word_loop + add #8,r4 + + .balignw 4,0x0009 +L_byte_loop_init: + tst r6,r6 + bt L_byte_exit + + .balignw 4,0x0009 +L_byte_loop: + mov.b r5,@r4 + dt r6 + bf.s L_byte_loop + add #1,r4 + + .balignw 4,0x0009 +L_byte_exit: rts - mov r3, r0 + mov r7,r0 END(memset) |