mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
341 lines
7.6 KiB
341 lines
7.6 KiB
|
|
#include "ksia64.h"
|
|
|
|
//++
|
|
//
|
|
// Copyright (c) Microsoft Corporation. All rights reserved.
|
|
//
|
|
// Routine:
|
|
//
|
|
// ULONG
|
|
// tcpxsum(
|
|
// IN ULONG ChkSum,
|
|
// IN PUCHAR Buffer
|
|
// IN ULONG BufferLength
|
|
// )
|
|
//
|
|
// Routine Description:
|
|
//
|
|
// This function computes the checksum of the specified buffer.
|
|
//
|
|
// Arguments:
|
|
//
|
|
// a0: supplies the initial checksum value, in 16-bit form,
|
|
// with the high word set to 0.
|
|
//
|
|
// a1: supplies a pointer to the buffer buffer.
|
|
//
|
|
// a2: supplies the length of the buffer in bytes.
|
|
//
|
|
//
|
|
// Return Value:
|
|
//
|
|
// The computed checksum in 32-bit form two-partial-accumulators form,
|
|
// added to the initial checksum is returned as the function value.
|
|
//
|
|
// Author:
|
|
//
|
|
// Thierry Fevrier (Hewlett-Packard) for Microsoft Corporation.
|
|
//
|
|
// Notes:
|
|
//
|
|
// !!WARNING!! - Thierry - 07/10/2000
|
|
// The following code has been carefully optimized.
|
|
// Please consider this before making any modifications... Thank you.
|
|
//
|
|
//--
|
|
|
|
LEAF_ENTRY(tcpxsum)
|
|
|
|
and t1 = -4, a1
|
|
and t2 = -4, a1
|
|
brp.dptk.imp xUA, UAbrlabel
|
|
|
|
and t17 = -8, a1 // mod 8 the address
|
|
cmp.gtu pt2, pt3 = 96, a2 // is size < 96?
|
|
;;
|
|
add t3 = 8, t2
|
|
|
|
(pt3) ld8 t16 = [t17], 64 // load first data needed for loop
|
|
cmp.eq pt0, pt1 = 20, a2 // is length 20 bytes ?
|
|
nop.i 0
|
|
|
|
mov t4 = 128;;
|
|
nop.m 0
|
|
cmp.gtu pt2 = a2, t4;; //is a2 > 128?
|
|
|
|
(pt2) lfetch [t17], 64;; // if yes, you can prefetch 4
|
|
(pt2) lfetch [t17], 64 // do prefetches of data needed
|
|
nop.i 0;;
|
|
|
|
nop.m 0
|
|
nop.i 0
|
|
(pt1) br.cond.dptk.few x32start;;
|
|
|
|
ld4 t11 = [t2], 4
|
|
tbit.nz pt9 = a1, 0
|
|
nop.b 0
|
|
|
|
ld4 t12 = [t3], 4
|
|
cmp.ltu pt1 = t1, a1 // if not 4 byte aligned
|
|
(pt1) br.cond.dpnt.few x32start;;
|
|
|
|
ld4 t13 = [t2], 4
|
|
ld4 t14 = [t3], 4
|
|
nop.i 0;;
|
|
|
|
ld4 t15 = [t3]
|
|
add t20 = t11, t12
|
|
add t21 = t13, t14;;
|
|
|
|
add t20 = t20, t21;;
|
|
add t20 = t20, t15
|
|
nop.i 0;;
|
|
|
|
xfold:
|
|
addl t10 = 0xffff, zero // fold 64 bit into 16 bits
|
|
dep t0 = -1, zero, 0, 32
|
|
nop.i 0;;
|
|
|
|
and t1 = t20, t0
|
|
extr.u t2 = t20, 32, 32;;
|
|
add t20 = t1, t2;;
|
|
|
|
and t1 = t20, t0
|
|
extr.u t2 = t20, 32, 32;;
|
|
add t20 = t1, t2;;
|
|
|
|
and t2 = t20, t10
|
|
extr.u t1 = t20, 16, 16;;
|
|
add t20 = t1, t2;;
|
|
|
|
and t2 = t20, t10
|
|
extr.u t1 = t20, 16, 1;;
|
|
add t20 = t1, t2;;
|
|
|
|
(pt9) nop.m 0 // swap bytes if necessary
|
|
(pt9) extr.u t1 = t20, 8, 8
|
|
(pt9) nop.i 0;;
|
|
|
|
(pt9) nop.m 0
|
|
(pt9) dep t20 = t20, t1, 8, 8
|
|
(pt9) nop.i 0;;
|
|
|
|
add t20 = a0, t20 // add seed, fold again
|
|
nop.i 0
|
|
nop.i 0;;
|
|
|
|
extr.u t1 = t20, 32, 1
|
|
extr.u t2 = t20, 0, 32;;
|
|
add t20 = t1, t2;;
|
|
|
|
and t1 = t20, t10
|
|
extr.u t2 = t20, 16, 16;;
|
|
add t20 = t1, t2;;
|
|
|
|
and t1 = t20, t10
|
|
extr.u t2 = t20, 16, 1;;
|
|
add t20 = t1, t2;;
|
|
|
|
add v0 = zero, t20
|
|
nop.i 0
|
|
br.ret.sptk.few b0;;
|
|
|
|
x32start: // not 20 bytes
|
|
|
|
and t1 = -8, a1
|
|
cmp.eq pt3 = 1, zero
|
|
cmp.eq pt4 = 1, zero
|
|
|
|
add t10 = a1, a2
|
|
mov t20 = zero
|
|
tbit.nz pt9 = a1, 0;;
|
|
|
|
cmp.ltu pt1 = t1, a1
|
|
brp.sptk.imp x32startA, x32Abrlabel
|
|
UAbrlabel:
|
|
(pt1) br.cond.dptk.few xUA;;
|
|
|
|
|
|
x32startA: // now it is 8 byte aligned
|
|
|
|
and t10 = -8, t10
|
|
dep t9 = zero, a2, 0, 6 // make last 6 bits of count 0
|
|
// 6 bits => 64 = # bytes consumed
|
|
// in one iteration
|
|
adds t2 = 8, t1;;
|
|
|
|
cmp.gtu pt2 = 96, a2 // count < 96
|
|
add t5 = t1, t9
|
|
(pt2) br.cond.dpnt.few xLT32;;
|
|
|
|
ld8 t3 = [t1], 16 // initial load can eliminated. It may no
|
|
// longer be valid if alignment occurred, it
|
|
// was there to provide order
|
|
mov t4 = 128;;
|
|
cmp.gtu pt2 = a2, t4;; // is a2 > 256?
|
|
|
|
ld8 t4 = [t2], 16
|
|
(pt2) lfetch [t17], 64
|
|
mov t14 = zero;;
|
|
|
|
(pt2) lfetch [t17], 64
|
|
mov t11 = zero
|
|
mov t13 = zero
|
|
|
|
ld8 t18 = [t1], 16
|
|
ld8 t19 = [t2], 16
|
|
mov t12 = zero;;
|
|
|
|
x32loop: // t5 = address to stop fetching at
|
|
// t17 = next addr to prefetch
|
|
|
|
ld8 t6 = [t1], 16 // modified main loop; unrolled a little more
|
|
// and using prefetches
|
|
ld8 t7 = [t2], 16
|
|
add t11 = t11, t3
|
|
|
|
add t12 = t12, t4
|
|
add t13 = t13, t18
|
|
add t14 = t14, t19;;
|
|
|
|
ld8 t8 = [t1], 16
|
|
ld8 t9 = [t2], 16
|
|
cmp.ltu pt1 = t11, t3
|
|
|
|
cmp.ltu pt2 = t12, t4
|
|
cmp.ltu pt3 = t13, t18
|
|
cmp.ltu pt4 = t14, t19;;
|
|
|
|
cmp.ltu pt0 = t1, t5
|
|
cmp.ltu pt5 = t17, t5
|
|
(pt1) adds t11 = 1, t11
|
|
|
|
(pt2) adds t12 = 1, t12
|
|
(pt3) adds t13 = 1, t13
|
|
(pt4) adds t14 = 1, t14;;
|
|
|
|
(pt0) ld8 t3 = [t1], 16
|
|
(pt5) lfetch [t17], 64
|
|
add t11 = t11, t6
|
|
|
|
add t12 = t12, t7
|
|
add t13 = t13, t8
|
|
add t14 = t14, t9;;
|
|
|
|
(pt0) ld8 t4 = [t2], 16
|
|
(pt0) ld8 t18 = [t1], 16
|
|
cmp.ltu pt1 = t11, t6
|
|
|
|
cmp.ltu pt2 = t12, t7
|
|
cmp.ltu pt3 = t13, t8
|
|
cmp.ltu pt4 = t14, t9;;
|
|
|
|
(pt0) ld8 t19 = [t2], 16
|
|
(pt1) adds t11 = 1, t11
|
|
(pt2) adds t12 = 1, t12
|
|
|
|
(pt3) adds t13 = 1, t13
|
|
(pt4) adds t14 = 1, t14
|
|
(pt0) br.cond.dptk.many x32loop;; // merge parallel adds
|
|
add t21 = t11, t12;;
|
|
nop.m 0
|
|
cmp.ltu pt8 = t21, t11;;
|
|
|
|
(pt8) adds t21 = 1, t21;;
|
|
nop.m 0
|
|
add t20 = t20, t21;;
|
|
|
|
cmp.ltu pt1 = t20, t21;;
|
|
add t21 = t13, t14
|
|
(pt1) adds t20 = 1, t20;;
|
|
|
|
cmp.ltu pt2 = t21, t13
|
|
nop.i 0;;
|
|
(pt2) adds t21 = 1, t21;;
|
|
|
|
add t20 = t20, t21
|
|
nop.i 0;;
|
|
cmp.ltu pt1 = t20, t21;;
|
|
|
|
(pt1) adds t20 = 1, t20
|
|
nop.i 0
|
|
nop.i 0
|
|
|
|
xLT32: // < 32
|
|
|
|
nop.m 0
|
|
cmp.ltu pt0, pt1 = t1, t10
|
|
(pt1) br.cond.dpnt.few xtail
|
|
|
|
ld8 t11 = [t1], 8;;
|
|
add t20 = t20, t11
|
|
nop.i 0;;
|
|
|
|
cmp.ltu pt0 = t20, t11;;
|
|
(pt0) adds t20 = 1, t20
|
|
nop.i 0;;
|
|
|
|
nop.m 0
|
|
nop.f 0
|
|
br.cond.sptk.many xLT32
|
|
|
|
xtail: // < 8
|
|
|
|
and t5 = 7, a2;;
|
|
cmp.eq pt0 = zero, t5
|
|
nop.i 0
|
|
|
|
nop.m 0
|
|
nop.f 0
|
|
(pt0) br.cond.sptk.many xfold
|
|
|
|
ld8 t11 = [t1]
|
|
sub t6 = 8, t5
|
|
adds t7 = -1, zero;;
|
|
|
|
nop.m 0
|
|
shl t6 = t6, 3
|
|
nop.b 0;;
|
|
|
|
nop.m 0
|
|
shr.u t7 = t7, t6;;
|
|
and t11 = t11, t7;;
|
|
|
|
add t20 = t20, t11
|
|
nop.i 0;;
|
|
cmp.ltu pt0 = t20, t11;;
|
|
|
|
(pt0) adds t20 = 1, t20
|
|
nop.f 0
|
|
br.cond.sptk.many xfold
|
|
|
|
xUA: // unaligned
|
|
and t5 = 7, a1
|
|
dep t1 = zero, a1, 0, 3
|
|
adds t6 = -1, zero;;
|
|
|
|
ld8 t11 = [t1], 8
|
|
sub t7 = 8, t5 ;;
|
|
cmp.ltu pt0, pt1 = a2, t7;;
|
|
|
|
|
|
(pt0) sub t9 = t7, a2
|
|
shl t8 = t5, 3;;
|
|
(pt0) shl t12 = t9, 3;;
|
|
|
|
nop.m 0
|
|
(pt0) shr.u t14 = t6, t12
|
|
shl t13 = t6, t8;;
|
|
|
|
and t20 = t11, t13;;
|
|
(pt0) and t20 = t20, t14
|
|
(pt0) mov a2 = zero
|
|
|
|
(pt1) sub a2 = a2, t7
|
|
mov a1 = t1
|
|
x32Abrlabel:
|
|
br.cond.sptk.many x32startA
|
|
|
|
LEAF_EXIT(tcpxsum)
|
|
|