diff options
Diffstat (limited to 'Source/DirectFB/lib/direct/ppcasm_memcpy.S')
| -rwxr-xr-x | Source/DirectFB/lib/direct/ppcasm_memcpy.S | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/Source/DirectFB/lib/direct/ppcasm_memcpy.S b/Source/DirectFB/lib/direct/ppcasm_memcpy.S new file mode 100755 index 0000000..04b695b --- /dev/null +++ b/Source/DirectFB/lib/direct/ppcasm_memcpy.S @@ -0,0 +1,77 @@ +/* + * String handling functions for PowerPC. + * + * Copyright (C) 1996 Paul Mackerras. + * + * + * In a mail from Paul on 23.10.2006 05:47: + * + * You may put an LGPL permission statement on that code, replacing the + * GPL permission statement. From a technical point of view, I'm not + * sure that the code in ppcasm_memcpy_cachable.S is the best thing to + * use in userspace, though; for one thing, it has a cache line size + * assumption encoded into it. Why don't you just use the glibc memcpy? + * It's pretty well optimized these days, AFAIK. + * + * Paul. + * + * + * This 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 of the License, or (at your option) any later version. + * + * This 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 this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include "ppc_asm.h" + + .globl direct_ppcasm_memcpy +direct_ppcasm_memcpy: + srwi. r7,r5,3 + addi r6,r3,-4 + addi r4,r4,-4 + beq 2f /* if less than 8 bytes to do */ + andi. r0,r6,3 /* get dest word aligned */ + mtctr r7 + bne 5f +1: lwz r7,4(r4) + lwzu r8,8(r4) + stw r7,4(r6) + stwu r8,8(r6) + bdnz 1b + andi. r5,r5,7 +2: cmplwi 0,r5,4 + blt 3f + lwzu r0,4(r4) + addi r5,r5,-4 + stwu r0,4(r6) +3: cmpwi 0,r5,0 + beqlr + mtctr r5 + addi r4,r4,3 + addi r6,r6,3 +4: lbzu r0,1(r4) + stbu r0,1(r6) + bdnz 4b + blr +5: subfic r0,r0,4 + mtctr r0 +6: lbz r7,4(r4) + addi r4,r4,1 + stb r7,4(r6) + addi r6,r6,1 + bdnz 6b + subf r5,r0,r5 + rlwinm. r7,r5,32-3,3,31 + beq 2b + mtctr r7 + b 1b |