mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-29 04:45:05 +00:00
6ec274750c
Simple microoptimizations for sparc64 atomic functions: Save one instruction by using a delay slot. Use %g1 instead of %g7, because %g1 is written earlier. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
135 lines
2.8 KiB
ArmAsm
135 lines
2.8 KiB
ArmAsm
/* atomic.S: These things are too big to do inline.
|
|
*
|
|
* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
|
|
#include <asm/asi.h>
|
|
#include <asm/backoff.h>
|
|
|
|
.text
|
|
|
|
/* Two versions of the atomic routines, one that
|
|
* does not return a value and does not perform
|
|
* memory barriers, and a second which returns
|
|
* a value and does the barriers.
|
|
*/
|
|
.globl atomic_add
|
|
.type atomic_add,#function
|
|
atomic_add: /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic_add, .-atomic_add
|
|
|
|
.globl atomic_sub
|
|
.type atomic_sub,#function
|
|
atomic_sub: /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic_sub, .-atomic_sub
|
|
|
|
.globl atomic_add_ret
|
|
.type atomic_add_ret,#function
|
|
atomic_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, 2f
|
|
add %g1, %o0, %g1
|
|
retl
|
|
sra %g1, 0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic_add_ret, .-atomic_add_ret
|
|
|
|
.globl atomic_sub_ret
|
|
.type atomic_sub_ret,#function
|
|
atomic_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: lduw [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
cas [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %icc, 2f
|
|
sub %g1, %o0, %g1
|
|
retl
|
|
sra %g1, 0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic_sub_ret, .-atomic_sub_ret
|
|
|
|
.globl atomic64_add
|
|
.type atomic64_add,#function
|
|
atomic64_add: /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic64_add, .-atomic64_add
|
|
|
|
.globl atomic64_sub
|
|
.type atomic64_sub,#function
|
|
atomic64_sub: /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, 2f
|
|
nop
|
|
retl
|
|
nop
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic64_sub, .-atomic64_sub
|
|
|
|
.globl atomic64_add_ret
|
|
.type atomic64_add_ret,#function
|
|
atomic64_add_ret: /* %o0 = increment, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
add %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, 2f
|
|
nop
|
|
retl
|
|
add %g1, %o0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic64_add_ret, .-atomic64_add_ret
|
|
|
|
.globl atomic64_sub_ret
|
|
.type atomic64_sub_ret,#function
|
|
atomic64_sub_ret: /* %o0 = decrement, %o1 = atomic_ptr */
|
|
BACKOFF_SETUP(%o2)
|
|
1: ldx [%o1], %g1
|
|
sub %g1, %o0, %g7
|
|
casx [%o1], %g1, %g7
|
|
cmp %g1, %g7
|
|
bne,pn %xcc, 2f
|
|
nop
|
|
retl
|
|
sub %g1, %o0, %o0
|
|
2: BACKOFF_SPIN(%o2, %o3, 1b)
|
|
.size atomic64_sub_ret, .-atomic64_sub_ret
|