kernel-ark/arch/sparc64/lib/ipcsum.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

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