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/*
* Copyright (C) 2013, 2014-2015, 2017 Synopsys, Inc. (www.synopsys.com)
* Copyright (C) 2007 ARC International (UK) LTD
*
* Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
*/
#include <sysdep.h>
#if !defined(__ARC700__) && !defined(__ARCHS__)
#error "Neither ARC700 nor ARCHS is defined!"
#endif
ENTRY(memset)
#ifdef __ARC700__
#define SMALL 7 /* Must be at least 6 to deal with alignment/loop issues. */
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]
#endif /* __ARC700__ */
#ifdef __ARCHS__
#ifdef DONT_USE_PREALLOC
#define PREWRITE(A,B) prefetchw [(A),(B)]
#else
#define PREWRITE(A,B) prealloc [(A),(B)]
#endif
prefetchw [r0] ; Prefetch the write location
mov.f 0, r2
;;; if size is zero
jz.d [blink]
mov r3, r0 ; don't clobber ret val
;;; if length < 8
brls.d.nt r2, 8, .Lsmallchunk
mov.f lp_count,r2
and.f r4, r0, 0x03
rsub lp_count, r4, 4
lpnz @.Laligndestination
;; LOOP BEGIN
stb.ab r1, [r3,1]
sub r2, r2, 1
.Laligndestination:
;;; Destination is aligned
and r1, r1, 0xFF
asl r4, r1, 8
or r4, r4, r1
asl r5, r4, 16
or r5, r5, r4
mov r4, r5
sub3 lp_count, r2, 8
cmp r2, 64
bmsk.hi r2, r2, 5
mov.ls lp_count, 0
add3.hi r2, r2, 8
;;; Convert len to Dwords, unfold x8
lsr.f lp_count, lp_count, 6
lpnz @.Lset64bytes
;; LOOP START
PREWRITE(r3, 64) ;Prefetch the next write location
#if defined(__LL64__) || defined(__ARC_LL64__)
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
#else
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
#endif
.Lset64bytes:
lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes
lpnz .Lset32bytes
;; LOOP START
prefetchw [r3, 32] ;Prefetch the next write location
#if defined(__LL64__) || defined(__ARC_LL64__)
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
std.ab r4, [r3, 8]
#else
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
st.ab r4, [r3, 4]
#endif
.Lset32bytes:
and.f lp_count, r2, 0x1F ;Last remaining 31 bytes
.Lsmallchunk:
lpnz .Lcopy3bytes
;; LOOP START
stb.ab r1, [r3, 1]
.Lcopy3bytes:
j [blink]
#endif /* __ARCHS__ */
END(memset)
libc_hidden_def(memset)
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