1da177e4c3
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!
35 lines
658 B
ArmAsm
35 lines
658 B
ArmAsm
.text
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.align 32
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.globl ip_fast_csum
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.type ip_fast_csum,#function
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ip_fast_csum: /* %o0 = iph, %o1 = ihl */
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sub %o1, 4, %g7
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lduw [%o0 + 0x00], %o2
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lduw [%o0 + 0x04], %g2
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lduw [%o0 + 0x08], %g3
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addcc %g2, %o2, %o2
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lduw [%o0 + 0x0c], %g2
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addccc %g3, %o2, %o2
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lduw [%o0 + 0x10], %g3
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addccc %g2, %o2, %o2
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addc %o2, %g0, %o2
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1: addcc %g3, %o2, %o2
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add %o0, 4, %o0
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addccc %o2, %g0, %o2
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subcc %g7, 1, %g7
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be,a,pt %icc, 2f
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sll %o2, 16, %g2
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lduw [%o0 + 0x10], %g3
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ba,pt %xcc, 1b
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nop
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2: addcc %o2, %g2, %g2
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srl %g2, 16, %o2
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addc %o2, %g0, %o2
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xnor %g0, %o2, %o2
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set 0xffff, %o1
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retl
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and %o2, %o1, %o0
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.size ip_fast_csum, .-ip_fast_csum
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