https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 99abfeafb5f2eea1bb481330ff37343e1133c924 authored by Linus Torvalds on 25 January 2007, 02:19:28 UTC
Linux 2.6.20-rc6
Linux 2.6.20-rc6
Tip revision: 99abfea
div64.S
/*
* Divide a 64-bit unsigned number by a 32-bit unsigned number.
* This routine assumes that the top 32 bits of the dividend are
* non-zero to start with.
* On entry, r3 points to the dividend, which get overwritten with
* the 64-bit quotient, and r4 contains the divisor.
* On exit, r3 contains the remainder.
*
* Copyright (C) 2002 Paul Mackerras, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include "ppc_asm.h"
.globl __div64_32
__div64_32:
lwz r5,0(r3) # get the dividend into r5/r6
lwz r6,4(r3)
cmplw r5,r4
li r7,0
li r8,0
blt 1f
divwu r7,r5,r4 # if dividend.hi >= divisor,
mullw r0,r7,r4 # quotient.hi = dividend.hi / divisor
subf. r5,r0,r5 # dividend.hi %= divisor
beq 3f
1: mr r11,r5 # here dividend.hi != 0
andis. r0,r5,0xc000
bne 2f
cntlzw r0,r5 # we are shifting the dividend right
li r10,-1 # to make it < 2^32, and shifting
srw r10,r10,r0 # the divisor right the same amount,
add r9,r4,r10 # rounding up (so the estimate cannot
andc r11,r6,r10 # ever be too large, only too small)
andc r9,r9,r10
or r11,r5,r11
rotlw r9,r9,r0
rotlw r11,r11,r0
divwu r11,r11,r9 # then we divide the shifted quantities
2: mullw r10,r11,r4 # to get an estimate of the quotient,
mulhwu r9,r11,r4 # multiply the estimate by the divisor,
subfc r6,r10,r6 # take the product from the divisor,
add r8,r8,r11 # and add the estimate to the accumulated
subfe. r5,r9,r5 # quotient
bne 1b
3: cmplw r6,r4
blt 4f
divwu r0,r6,r4 # perform the remaining 32-bit division
mullw r10,r0,r4 # and get the remainder
add r8,r8,r0
subf r6,r10,r6
4: stw r7,0(r3) # return the quotient in *r3
stw r8,4(r3)
mr r3,r6 # return the remainder in r3
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