linux/arch/sparc/lib/ipcsum.S
Sam Ravnborg 478b8fecda sparc,sparc64: unify lib/
o Renamed files in sparc64 to <name>_64.S when identical
  to sparc32 files.
o iomap.c were equal for sparc32 and sparc64
o adjusted sparc/Makefile now we have only one lib/

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-04 09:17:19 -08:00

35 lines
658 B
ArmAsm

.text
.align 32
.globl ip_fast_csum
.type ip_fast_csum,#function
ip_fast_csum: /* %o0 = iph, %o1 = ihl */
sub %o1, 4, %g7
lduw [%o0 + 0x00], %o2
lduw [%o0 + 0x04], %g2
lduw [%o0 + 0x08], %g3
addcc %g2, %o2, %o2
lduw [%o0 + 0x0c], %g2
addccc %g3, %o2, %o2
lduw [%o0 + 0x10], %g3
addccc %g2, %o2, %o2
addc %o2, %g0, %o2
1: addcc %g3, %o2, %o2
add %o0, 4, %o0
addccc %o2, %g0, %o2
subcc %g7, 1, %g7
be,a,pt %icc, 2f
sll %o2, 16, %g2
lduw [%o0 + 0x10], %g3
ba,pt %xcc, 1b
nop
2: addcc %o2, %g2, %g2
srl %g2, 16, %o2
addc %o2, %g0, %o2
xnor %g0, %o2, %o2
set 0xffff, %o1
retl
and %o2, %o1, %o0
.size ip_fast_csum, .-ip_fast_csum