diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-01-18 15:12:18 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-02-11 20:00:35 +0530 |
| commit | 5210d1e6889c8183ecad269e86e2d9c524015b5f (patch) | |
| tree | 77fcc0cfb1853c553eaf58a271256f13b860a528 /arch/arc/lib/memset.S | |
| parent | 6e35fa2d430538cd0609e499c6f789beea9e9798 (diff) | |
ARC: String library
Hand optimised asm code for ARC700 pipeline.
Originally written/optimized by Joern Rennecke
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Joern Rennecke <joern.rennecke@embecosm.com>
Diffstat (limited to 'arch/arc/lib/memset.S')
| -rw-r--r-- | arch/arc/lib/memset.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arc/lib/memset.S b/arch/arc/lib/memset.S new file mode 100644 index 00000000000..9b2d88d2e14 --- /dev/null +++ b/arch/arc/lib/memset.S @@ -0,0 +1,59 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <asm/linkage.h> + +#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */ + +ARC_ENTRY memset + mov_s r4,r0 + or r12,r0,r2 + bmsk.f r12,r12,1 + extb_s r1,r1 + asl r3,r1,8 + beq.d .Laligned + or_s r1,r1,r3 + brls r2,SMALL,.Ltiny + add r3,r2,r0 + stb r1,[r3,-1] + bclr_s r3,r3,0 + stw r1,[r3,-2] + bmsk.f r12,r0,1 + add_s r2,r2,r12 + sub.ne r2,r2,4 + stb.ab r1,[r4,1] + and r4,r4,-2 + stw.ab r1,[r4,2] + and r4,r4,-4 +.Laligned: ; This code address should be aligned for speed. + asl r3,r1,16 + lsr.f lp_count,r2,2 + or_s r1,r1,r3 + lpne .Loop_end + st.ab r1,[r4,4] +.Loop_end: + j_s [blink] + + .balign 4 +.Ltiny: + mov.f lp_count,r2 + lpne .Ltiny_end + stb.ab r1,[r4,1] +.Ltiny_end: + j_s [blink] +ARC_EXIT memset + +; memzero: @r0 = mem, @r1 = size_t +; memset: @r0 = mem, @r1 = char, @r2 = size_t + +ARC_ENTRY memzero + ; adjust bzero args to memset args + mov r2, r1 + mov r1, 0 + b memset ;tail call so need to tinker with blink +ARC_EXIT memzero |