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NG4memset.S
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/* SPDX-License-Identifier: GPL-2.0 */
/* NG4memset.S: Niagara-4 optimized memset/bzero.
*
* Copyright (C) 2012 David S. Miller ([email protected])
*/
#include <asm/asi.h>
.register %g2, #scratch
.register %g3, #scratch
.text
.align 32
.globl NG4memset
NG4memset:
andcc %o1, 0xff, %o4
be,pt %icc, 1f
mov %o2, %o1
sllx %o4, 8, %g1
or %g1, %o4, %o2
sllx %o2, 16, %g1
or %g1, %o2, %o2
sllx %o2, 32, %g1
ba,pt %icc, 1f
or %g1, %o2, %o4
.size NG4memset,.-NG4memset
.align 32
.globl NG4bzero
NG4bzero:
clr %o4
1: cmp %o1, 16
ble %icc, .Ltiny
mov %o0, %o3
sub %g0, %o0, %g1
and %g1, 0x7, %g1
brz,pt %g1, .Laligned8
sub %o1, %g1, %o1
1: stb %o4, [%o0 + 0x00]
subcc %g1, 1, %g1
bne,pt %icc, 1b
add %o0, 1, %o0
.Laligned8:
cmp %o1, 64 + (64 - 8)
ble .Lmedium
sub %g0, %o0, %g1
andcc %g1, (64 - 1), %g1
brz,pn %g1, .Laligned64
sub %o1, %g1, %o1
1: stx %o4, [%o0 + 0x00]
subcc %g1, 8, %g1
bne,pt %icc, 1b
add %o0, 0x8, %o0
.Laligned64:
andn %o1, 64 - 1, %g1
sub %o1, %g1, %o1
brnz,pn %o4, .Lnon_bzero_loop
mov 0x20, %g2
1: stxa %o4, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
subcc %g1, 0x40, %g1
stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
bne,pt %icc, 1b
add %o0, 0x40, %o0
.Lpostloop:
cmp %o1, 8
bl,pn %icc, .Ltiny
membar #StoreStore|#StoreLoad
.Lmedium:
andn %o1, 0x7, %g1
sub %o1, %g1, %o1
1: stx %o4, [%o0 + 0x00]
subcc %g1, 0x8, %g1
bne,pt %icc, 1b
add %o0, 0x08, %o0
andcc %o1, 0x4, %g1
be,pt %icc, .Ltiny
sub %o1, %g1, %o1
stw %o4, [%o0 + 0x00]
add %o0, 0x4, %o0
.Ltiny:
cmp %o1, 0
be,pn %icc, .Lexit
1: subcc %o1, 1, %o1
stb %o4, [%o0 + 0x00]
bne,pt %icc, 1b
add %o0, 1, %o0
.Lexit:
retl
mov %o3, %o0
.Lnon_bzero_loop:
mov 0x08, %g3
mov 0x28, %o5
1: stxa %o4, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
subcc %g1, 0x40, %g1
stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
stxa %o4, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
stxa %o4, [%o0 + %o5] ASI_BLK_INIT_QUAD_LDD_P
add %o0, 0x10, %o0
stxa %o4, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P
stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P
stxa %o4, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P
stxa %o4, [%o0 + %o5] ASI_BLK_INIT_QUAD_LDD_P
bne,pt %icc, 1b
add %o0, 0x30, %o0
ba,a,pt %icc, .Lpostloop
nop
.size NG4bzero,.-NG4bzero