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ttmath/ttmath/ttmathuint_x86.h

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/*
* This file is a part of TTMath Bignum Library
* and is distributed under the (new) BSD licence.
* Author: Tomasz Sowa <t.sowa@slimaczek.pl>
*/
/*
* Copyright (c) 2006-2009, Tomasz Sowa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name Tomasz Sowa nor the names of contributors to this
* project may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef headerfilettmathuint_x86
#define headerfilettmathuint_x86
#ifndef TTMATH_NOASM
#ifdef TTMATH_PLATFORM32
/*!
\file ttmathuint_x86.h
\brief template class UInt<uint> with assembler code for 32bit x86 processors
this file is included at the end of ttmathuint.h
*/
/*!
\brief a namespace for the TTMath library
*/
namespace ttmath
{
/*!
*
* basic mathematic functions
*
*/
/*!
adding ss2 to the this and adding carry if it's defined
(this = this + ss2 + c)
c must be zero or one (might be a bigger value than 1)
function returns carry (1) (if it has been)
*/
template<uint value_size>
uint UInt<value_size>::Add(const UInt<value_size> & ss2, uint c)
{
uint b = value_size;
uint * p1 = table;
uint * p2 = const_cast<uint*>(ss2.table);
// we don't have to use TTMATH_REFERENCE_ASSERT here
// this algorithm doesn't require it
#ifndef __GNUC__
// this part might be compiled with for example visual c
__asm
{
push eax
push ebx
push ecx
push edx
push esi
mov ecx,[b]
mov ebx,[p1]
mov esi,[p2]
xor edx,edx // edx=0
mov eax,[c]
neg eax // CF=1 if rax!=0 , CF=0 if rax==0
p:
mov eax,[esi+edx*4]
adc [ebx+edx*4],eax
inc edx
dec ecx
jnz p
adc ecx, ecx
mov [c], ecx
pop esi
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
// this part should be compiled with gcc
__asm__ __volatile__(
"xorl %%edx, %%edx \n"
"negl %%eax \n" // CF=1 if rax!=0 , CF=0 if rax==0
"1: \n"
"movl (%%esi,%%edx,4), %%eax \n"
"adcl %%eax, (%%ebx,%%edx,4) \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"adc %%ecx, %%ecx \n"
: "=c" (c), "=a" (dummy), "=d" (dummy2)
: "0" (b), "1" (c), "b" (p1), "S" (p2)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Add")
return c;
}
/*!
adding one word (at a specific position)
and returning a carry (if it has been)
e.g.
if we've got (value_size=3):
table[0] = 10;
table[1] = 30;
table[2] = 5;
and we call:
AddInt(2,1)
then it'll be:
table[0] = 10;
table[1] = 30 + 2;
table[2] = 5;
of course if there was a carry from table[2] it would be returned
*/
template<uint value_size>
uint UInt<value_size>::AddInt(uint value, uint index)
{
uint b = value_size;
uint * p1 = table;
uint c;
TTMATH_ASSERT( index < value_size )
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
mov ecx, [b]
sub ecx, [index]
mov edx, [index]
mov ebx, [p1]
mov eax, [value]
p:
add [ebx+edx*4], eax
jnc end
mov eax, 1
inc edx
dec ecx
jnz p
end:
setc al
movzx edx, al
mov [c], edx
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
__asm__ __volatile__(
"subl %%edx, %%ecx \n"
"1: \n"
"addl %%eax, (%%ebx,%%edx,4) \n"
"jnc 2f \n"
"movl $1, %%eax \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"2: \n"
"setc %%al \n"
"movzx %%al, %%edx \n"
: "=d" (c), "=a" (dummy), "=c" (dummy2)
: "0" (index), "1" (value), "2" (b), "b" (p1)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::AddInt")
return c;
}
/*!
adding only two unsigned words to the existing value
and these words begin on the 'index' position
(it's used in the multiplication algorithm 2)
index should be equal or smaller than value_size-2 (index <= value_size-2)
x1 - lower word, x2 - higher word
for example if we've got value_size equal 4 and:
table[0] = 3
table[1] = 4
table[2] = 5
table[3] = 6
then let
x1 = 10
x2 = 20
and
index = 1
the result of this method will be:
table[0] = 3
table[1] = 4 + x1 = 14
table[2] = 5 + x2 = 25
table[3] = 6
and no carry at the end of table[3]
(of course if there was a carry in table[2](5+20) then
this carry would be passed to the table[3] etc.)
*/
template<uint value_size>
uint UInt<value_size>::AddTwoInts(uint x2, uint x1, uint index)
{
uint b = value_size;
uint * p1 = table;
uint c;
TTMATH_ASSERT( index < value_size - 1 )
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
mov ecx, [b]
sub ecx, [index]
mov ebx, [p1]
mov edx, [index]
mov eax, [x1]
add [ebx+edx*4], eax
inc edx
dec ecx
mov eax, [x2]
p:
adc [ebx+edx*4], eax
jnc end
mov eax, 0
inc edx
dec ecx
jnz p
end:
setc al
movzx edx, al
mov [c], edx
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
__asm__ __volatile__(
"subl %%edx, %%ecx \n"
"addl %%esi, (%%ebx,%%edx,4) \n"
"incl %%edx \n"
"decl %%ecx \n"
"1: \n"
"adcl %%eax, (%%ebx,%%edx,4) \n"
"jnc 2f \n"
"mov $0, %%eax \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"2: \n"
"setc %%al \n"
"movzx %%al, %%eax \n"
: "=a" (c), "=c" (dummy), "=d" (dummy2)
: "0" (x2), "1" (b), "2" (index), "b" (p1), "S" (x1)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::AddTwoInts")
return c;
}
/*!
this static method addes one vector to the other
'ss1' is larger in size or equal to 'ss2'
ss1 points to the first (larger) vector
ss2 points to the second vector
ss1_size - size of the ss1 (and size of the result too)
ss2_size - size of the ss2
result - is the result vector (which has size the same as ss1: ss1_size)
Example: ss1_size is 5, ss2_size is 3
ss1: ss2: result (output):
5 1 5+1
4 3 4+3
2 7 2+7
6 6
9 9
of course the carry is propagated and will be returned from the last item
(this method is used by the Karatsuba multiplication algorithm)
*/
template<uint value_size>
uint UInt<value_size>::AddVector(const uint * ss1, const uint * ss2, uint ss1_size, uint ss2_size, uint * result)
{
TTMATH_ASSERT( ss1_size >= ss2_size )
uint rest = ss1_size - ss2_size;
uint c;
#ifndef __GNUC__
// this part might be compiled with for example visual c
__asm
{
pushad
mov ecx, [ss2_size]
xor edx, edx // edx = 0, cf = 0
mov esi, [ss1]
mov ebx, [ss2]
mov edi, [result]
p:
mov eax, [esi+edx*4]
adc eax, [ebx+edx*4]
mov [edi+edx*4], eax
inc edx
dec ecx
jnz p
adc ecx, ecx // ecx has the cf state
mov ebx, [rest]
or ebx, ebx
jz end
xor ebx, ebx // ebx = 0
neg ecx // setting cf from ecx
mov ecx, [rest] // ecx is != 0
p2:
mov eax, [esi+edx*4]
adc eax, ebx
mov [edi+edx*4], eax
inc edx
dec ecx
jnz p2
adc ecx, ecx
end:
mov [c], ecx
popad
}
#endif
#ifdef __GNUC__
// this part should be compiled with gcc
uint dummy1, dummy2, dummy3;
__asm__ __volatile__(
"push %%edx \n"
"xor %%edx, %%edx \n" // edx = 0, cf = 0
"1: \n"
"mov (%%esi,%%edx,4), %%eax \n"
"adc (%%ebx,%%edx,4), %%eax \n"
"mov %%eax, (%%edi,%%edx,4) \n"
"inc %%edx \n"
"dec %%ecx \n"
"jnz 1b \n"
"adc %%ecx, %%ecx \n" // ecx has the cf state
"pop %%eax \n" // eax = rest
"or %%eax, %%eax \n"
"jz 3f \n"
"xor %%ebx, %%ebx \n" // ebx = 0
"neg %%ecx \n" // setting cf from ecx
"mov %%eax, %%ecx \n" // ecx=rest and is != 0
"2: \n"
"mov (%%esi, %%edx, 4), %%eax \n"
"adc %%ebx, %%eax \n"
"mov %%eax, (%%edi, %%edx, 4) \n"
"inc %%edx \n"
"dec %%ecx \n"
"jnz 2b \n"
"adc %%ecx, %%ecx \n"
"3: \n"
: "=a" (dummy1), "=b" (dummy2), "=c" (c), "=d" (dummy3)
: "1" (ss2), "2" (ss2_size), "3" (rest), "S" (ss1), "D" (result)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::AddVector")
return c;
}
/*!
subtracting ss2 from the 'this' and subtracting
carry if it has been defined
(this = this - ss2 - c)
c must be zero or one (might be a bigger value than 1)
function returns carry (1) (if it has been)
*/
template<uint value_size>
uint UInt<value_size>::Sub(const UInt<value_size> & ss2, uint c)
{
uint b = value_size;
uint * p1 = table;
uint * p2 = const_cast<uint*>(ss2.table);
// we don't have to use TTMATH_REFERENCE_ASSERT here
// this algorithm doesn't require it
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
push esi
mov ecx,[b]
mov ebx,[p1]
mov esi,[p2]
xor edx,edx // edx=0
mov eax,[c]
neg eax // CF=1 if rax!=0 , CF=0 if rax==0
p:
mov eax,[esi+edx*4]
sbb [ebx+edx*4],eax
inc edx
dec ecx
jnz p
adc ecx, ecx
mov [c], ecx
pop esi
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
__asm__ __volatile__(
"xorl %%edx, %%edx \n"
"negl %%eax \n" // CF=1 if rax!=0 , CF=0 if rax==0
"1: \n"
"movl (%%esi,%%edx,4), %%eax \n"
"sbbl %%eax, (%%ebx,%%edx,4) \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"adc %%ecx, %%ecx \n"
: "=c" (c), "=a" (dummy), "=d" (dummy2)
: "0" (b), "1" (c), "b" (p1), "S" (p2)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Sub")
return c;
}
/*!
this method subtracts one word (at a specific position)
and returns a carry (if it was)
e.g.
if we've got (value_size=3):
table[0] = 10;
table[1] = 30;
table[2] = 5;
and we call:
SubInt(2,1)
then it'll be:
table[0] = 10;
table[1] = 30 - 2;
table[2] = 5;
of course if there was a carry from table[2] it would be returned
*/
template<uint value_size>
uint UInt<value_size>::SubInt(uint value, uint index)
{
uint b = value_size;
uint * p1 = table;
uint c;
TTMATH_ASSERT( index < value_size )
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
mov ecx, [b]
sub ecx, [index]
mov edx, [index]
mov ebx, [p1]
mov eax, [value]
p:
sub [ebx+edx*4], eax
jnc end
mov eax, 1
inc edx
dec ecx
jnz p
end:
setc al
movzx edx, al
mov [c], edx
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
__asm__ __volatile__(
"subl %%edx, %%ecx \n"
"1: \n"
"subl %%eax, (%%ebx,%%edx,4) \n"
"jnc 2f \n"
"movl $1, %%eax \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"2: \n"
"setc %%al \n"
"movzx %%al, %%edx \n"
: "=d" (c), "=a" (dummy), "=c" (dummy2)
: "0" (index), "1" (value), "2" (b), "b" (p1)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::SubInt")
return c;
}
/*!
this static method subtractes one vector from the other
'ss1' is larger in size or equal to 'ss2'
ss1 points to the first (larger) vector
ss2 points to the second vector
ss1_size - size of the ss1 (and size of the result too)
ss2_size - size of the ss2
result - is the result vector (which has size the same as ss1: ss1_size)
Example: ss1_size is 5, ss2_size is 3
ss1: ss2: result (output):
5 1 5-1
4 3 4-3
2 7 2-7
6 6-1 (the borrow from previous item)
9 9
return (carry): 0
of course the carry (borrow) is propagated and will be returned from the last item
(this method is used by the Karatsuba multiplication algorithm)
*/
template<uint value_size>
uint UInt<value_size>::SubVector(const uint * ss1, const uint * ss2, uint ss1_size, uint ss2_size, uint * result)
{
TTMATH_ASSERT( ss1_size >= ss2_size )
uint rest = ss1_size - ss2_size;
uint c;
#ifndef __GNUC__
// this part might be compiled with for example visual c
/*
the asm code is nearly the same as in AddVector
only two instructions 'adc' are changed to 'sbb'
*/
__asm
{
pushad
mov ecx, [ss2_size]
xor edx, edx // edx = 0, cf = 0
mov esi, [ss1]
mov ebx, [ss2]
mov edi, [result]
p:
mov eax, [esi+edx*4]
sbb eax, [ebx+edx*4]
mov [edi+edx*4], eax
inc edx
dec ecx
jnz p
adc ecx, ecx // ecx has the cf state
mov ebx, [rest]
or ebx, ebx
jz end
xor ebx, ebx // ebx = 0
neg ecx // setting cf from ecx
mov ecx, [rest] // ecx is != 0
p2:
mov eax, [esi+edx*4]
sbb eax, ebx
mov [edi+edx*4], eax
inc edx
dec ecx
jnz p2
adc ecx, ecx
end:
mov [c], ecx
popad
}
#endif
#ifdef __GNUC__
// this part should be compiled with gcc
uint dummy1, dummy2, dummy3;
__asm__ __volatile__(
"push %%edx \n"
"xor %%edx, %%edx \n" // edx = 0, cf = 0
"1: \n"
"mov (%%esi,%%edx,4), %%eax \n"
"sbb (%%ebx,%%edx,4), %%eax \n"
"mov %%eax, (%%edi,%%edx,4) \n"
"inc %%edx \n"
"dec %%ecx \n"
"jnz 1b \n"
"adc %%ecx, %%ecx \n" // ecx has the cf state
"pop %%eax \n" // eax = rest
"or %%eax, %%eax \n"
"jz 3f \n"
"xor %%ebx, %%ebx \n" // ebx = 0
"neg %%ecx \n" // setting cf from ecx
"mov %%eax, %%ecx \n" // ecx=rest and is != 0
"2: \n"
"mov (%%esi, %%edx, 4), %%eax \n"
"sbb %%ebx, %%eax \n"
"mov %%eax, (%%edi, %%edx, 4) \n"
"inc %%edx \n"
"dec %%ecx \n"
"jnz 2b \n"
"adc %%ecx, %%ecx \n"
"3: \n"
: "=a" (dummy1), "=b" (dummy2), "=c" (c), "=d" (dummy3)
: "1" (ss2), "2" (ss2_size), "3" (rest), "S" (ss1), "D" (result)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::SubVector")
return c;
}
/*!
this method moves all bits into the left hand side
return value <- this <- c
the lowest *bit* will be held the 'c' and
the state of one additional bit (on the left hand side)
will be returned
for example:
let this is 001010000
after Rcl2_one(1) there'll be 010100001 and Rcl2_one returns 0
*/
template<uint value_size>
uint UInt<value_size>::Rcl2_one(uint c)
{
uint b = value_size;
uint * p1 = table;
#ifndef __GNUC__
__asm
{
push ebx
push ecx
push edx
mov ebx, [p1]
xor edx, edx
mov ecx, [c]
neg ecx
mov ecx, [b]
p:
rcl dword ptr [ebx+edx*4], 1
inc edx
dec ecx
jnz p
adc ecx, ecx
mov [c], ecx
pop edx
pop ecx
pop ebx
}
#endif
#ifdef __GNUC__
uint dummy, dummy2;
__asm__ __volatile__(
"xorl %%edx, %%edx \n" // edx=0
"negl %%eax \n" // CF=1 if eax!=0 , CF=0 if eax==0
"1: \n"
"rcll $1, (%%ebx, %%edx, 4) \n"
"incl %%edx \n"
"decl %%ecx \n"
"jnz 1b \n"
"adcl %%ecx, %%ecx \n"
: "=c" (c), "=a" (dummy), "=d" (dummy2)
: "0" (b), "1" (c), "b" (p1)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Rcl2_one")
return c;
}
/*!
this method moves all bits into the right hand side
c -> this -> return value
the highest *bit* will be held the 'c' and
the state of one additional bit (on the right hand side)
will be returned
for example:
let this is 000000010
after Rcr2_one(1) there'll be 100000001 and Rcr2_one returns 0
*/
template<uint value_size>
uint UInt<value_size>::Rcr2_one(uint c)
{
uint b = value_size;
uint * p1 = table;
#ifndef __GNUC__
__asm
{
push ebx
push ecx
mov ebx, [p1]
mov ecx, [c]
neg ecx
mov ecx, [b]
p:
rcr dword ptr [ebx+ecx*4-4], 1
dec ecx
jnz p
adc ecx, ecx
mov [c], ecx
pop ecx
pop ebx
}
#endif
#ifdef __GNUC__
uint dummy;
__asm__ __volatile__(
"negl %%eax \n" // CF=1 if eax!=0 , CF=0 if eax==0
"1: \n"
"rcrl $1, -4(%%ebx, %%ecx, 4) \n"
"decl %%ecx \n"
"jnz 1b \n"
"adcl %%ecx, %%ecx \n"
: "=c" (c), "=a" (dummy)
: "0" (b), "1" (c), "b" (p1)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Rcr2_one")
return c;
}
#ifdef _MSC_VER
#pragma warning (disable : 4731)
//warning C4731: frame pointer register 'ebp' modified by inline assembly code
#endif
/*!
this method moves all bits into the left hand side
return value <- this <- c
the lowest *bits* will be held the 'c' and
the state of one additional bit (on the left hand side)
will be returned
for example:
let this is 001010000
after Rcl2(3, 1) there'll be 010000111 and Rcl2 returns 1
*/
template<uint value_size>
uint UInt<value_size>::Rcl2(uint bits, uint c)
{
TTMATH_ASSERT( bits>0 && bits<TTMATH_BITS_PER_UINT )
uint b = value_size;
uint * p1 = table;
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
push esi
push edi
push ebp
mov edi, [b]
mov ecx, 32
sub ecx, [bits]
mov edx, -1
shr edx, cl
mov ecx, [bits]
mov ebx, [p1]
mov eax, [c]
mov ebp, edx // ebp = mask (modified ebp - don't read/write to variables)
xor edx, edx // edx = 0
mov esi, edx
or eax, eax
cmovnz esi, ebp // if(c) esi=mask else esi=0
p:
rol dword ptr [ebx+edx*4], cl
mov eax, [ebx+edx*4]
and eax, ebp
xor [ebx+edx*4], eax // clearing bits
or [ebx+edx*4], esi // saving old value
mov esi, eax
inc edx
dec edi
jnz p
pop ebp // restoring ebp
and eax, 1
mov [c], eax
pop edi
pop esi
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2, dummy3;
__asm__ __volatile__(
"push %%ebp \n"
"movl %%ecx, %%esi \n"
"movl $32, %%ecx \n"
"subl %%esi, %%ecx \n" // ecx = 32 - bits
"movl $-1, %%edx \n" // edx = -1 (all bits set to one)
"shrl %%cl, %%edx \n" // shifting (0 -> edx -> cf) (cl times)
"movl %%edx, %%ebp \n" // ebp = edx = mask
"movl %%esi, %%ecx \n"
"xorl %%edx, %%edx \n"
"movl %%edx, %%esi \n"
"orl %%eax, %%eax \n"
"cmovnz %%ebp, %%esi \n" // if(c) esi=mask else esi=0
"1: \n"
"roll %%cl, (%%ebx,%%edx,4) \n"
"movl (%%ebx,%%edx,4), %%eax \n"
"andl %%ebp, %%eax \n"
"xorl %%eax, (%%ebx,%%edx,4) \n"
"orl %%esi, (%%ebx,%%edx,4) \n"
"movl %%eax, %%esi \n"
"incl %%edx \n"
"decl %%edi \n"
"jnz 1b \n"
"and $1, %%eax \n"
"pop %%ebp \n"
: "=a" (c), "=D" (dummy), "=S" (dummy2), "=d" (dummy3)
: "0" (c), "1" (b), "b" (p1), "c" (bits)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Rcl2")
return c;
}
/*!
this method moves all bits into the right hand side
C -> this -> return value
the highest *bits* will be held the 'c' and
the state of one additional bit (on the right hand side)
will be returned
for example:
let this is 000000010
after Rcr2(2, 1) there'll be 110000000 and Rcr2 returns 1
*/
template<uint value_size>
uint UInt<value_size>::Rcr2(uint bits, uint c)
{
TTMATH_ASSERT( bits>0 && bits<TTMATH_BITS_PER_UINT )
uint b = value_size;
uint * p1 = table;
#ifndef __GNUC__
__asm
{
push eax
push ebx
push ecx
push edx
push esi
push edi
push ebp
mov edi, [b]
mov ecx, 32
sub ecx, [bits]
mov edx, -1
shl edx, cl
mov ecx, [bits]
mov ebx, [p1]
mov eax, [c]
mov ebp, edx // ebp = mask (modified ebp - don't read/write to variables)
xor edx, edx // edx = 0
mov esi, edx
add edx, edi
dec edx // edx is pointing at the end of the table (on last word)
or eax, eax
cmovnz esi, ebp // if(c) esi=mask else esi=0
p:
ror dword ptr [ebx+edx*4], cl
mov eax, [ebx+edx*4]
and eax, ebp
xor [ebx+edx*4], eax // clearing bits
or [ebx+edx*4], esi // saving old value
mov esi, eax
dec edx
dec edi
jnz p
pop ebp // restoring ebp
rol eax, 1 // 31bit will be first
and eax, 1
mov [c], eax
pop edi
pop esi
pop edx
pop ecx
pop ebx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy, dummy2, dummy3;
__asm__ __volatile__(
"push %%ebp \n"
"movl %%ecx, %%esi \n"
"movl $32, %%ecx \n"
"subl %%esi, %%ecx \n" // ecx = 32 - bits
"movl $-1, %%edx \n" // edx = -1 (all bits set to one)
"shll %%cl, %%edx \n" // shifting (cf <- edx <- 0) (cl times)
"movl %%edx, %%ebp \n" // ebp = edx = mask
"movl %%esi, %%ecx \n"
"xorl %%edx, %%edx \n"
"movl %%edx, %%esi \n"
"addl %%edi, %%edx \n"
"decl %%edx \n" // edx is pointing at the end of the table (on last word)
"orl %%eax, %%eax \n"
"cmovnz %%ebp, %%esi \n" // if(c) esi=mask else esi=0
"1: \n"
"rorl %%cl, (%%ebx,%%edx,4) \n"
"movl (%%ebx,%%edx,4), %%eax \n"
"andl %%ebp, %%eax \n"
"xorl %%eax, (%%ebx,%%edx,4) \n"
"orl %%esi, (%%ebx,%%edx,4) \n"
"movl %%eax, %%esi \n"
"decl %%edx \n"
"decl %%edi \n"
"jnz 1b \n"
"roll $1, %%eax \n"
"andl $1, %%eax \n"
"pop %%ebp \n"
: "=a" (c), "=D" (dummy), "=S" (dummy2), "=d" (dummy3)
: "0" (c), "1" (b), "b" (p1), "c" (bits)
: "cc", "memory" );
#endif
TTMATH_LOG("UInt::Rcr2")
return c;
}
#ifdef _MSC_VER
#pragma warning (default : 4731)
#endif
/*
this method returns the number of the highest set bit in one 32-bit word
if the 'x' is zero this method returns '-1'
*/
template<uint value_size>
sint UInt<value_size>::FindLeadingBitInWord(uint x)
{
sint result;
#ifndef __GNUC__
__asm
{
push eax
push edx
mov edx,-1
bsr eax,[x]
cmovz eax,edx
mov [result], eax
pop edx
pop eax
}
#endif
#ifdef __GNUC__
uint dummy;
__asm__ (
"movl $-1, %1 \n"
"bsrl %2, %0 \n"
"cmovz %1, %0 \n"
: "=r" (result), "=&r" (dummy)
: "r" (x)
: "cc" );
#endif
return result;
}
/*!
this method sets a special bit in the 'value'
and returns the last state of the bit (zero or one)
bit is from <0,31>
e.g.
uint x = 100;
uint bit = SetBitInWord(x, 3);
now: x = 108 and bit = 0
*/
template<uint value_size>
uint UInt<value_size>::SetBitInWord(uint & value, uint bit)
{
TTMATH_ASSERT( bit < TTMATH_BITS_PER_UINT )
uint old_bit;
uint v = value;
#ifndef __GNUC__
__asm
{
push ebx
push eax
mov eax, [v]
mov ebx, [bit]
bts eax, ebx
mov [v], eax
setc bl
movzx ebx, bl
mov [old_bit], ebx
pop eax
pop ebx
}
#endif
#ifdef __GNUC__
__asm__ (
"btsl %%ebx, %%eax \n"
"setc %%bl \n"
"movzx %%bl, %%ebx \n"
: "=a" (v), "=b" (old_bit)
: "0" (v), "1" (bit)
: "cc" );
#endif
value = v;
return old_bit;
}
/*!
multiplication: result_high:result_low = a * b
result_high - higher word of the result
result_low - lower word of the result
this methos never returns a carry
this method is used in the second version of the multiplication algorithms
*/
template<uint value_size>
void UInt<value_size>::MulTwoWords(uint a, uint b, uint * result_high, uint * result_low)
{
/*
we must use these temporary variables in order to inform the compilator
that value pointed with result1 and result2 has changed
this has no effect in visual studio but it's useful when
using gcc and options like -Ox
*/
uint result1_;
uint result2_;
#ifndef __GNUC__
__asm
{
push eax
push edx
mov eax, [a]
mul dword ptr [b]
mov [result2_], edx
mov [result1_], eax
pop edx
pop eax
}
#endif
#ifdef __GNUC__
__asm__ (
"mull %%edx \n"
: "=a" (result1_), "=d" (result2_)
: "0" (a), "1" (b)
: "cc" );
#endif
*result_low = result1_;
*result_high = result2_;
}
/*!
*
* Division
*
*
*/
/*!
this method calculates 64bits word a:b / 32bits c (a higher, b lower word)
r = a:b / c and rest - remainder
*
* WARNING:
* if r (one word) is too small for the result or c is equal zero
* there'll be a hardware interruption (0)
* and probably the end of your program
*
*/
template<uint value_size>
void UInt<value_size>::DivTwoWords(uint a, uint b, uint c, uint * r, uint * rest)
{
uint r_;
uint rest_;
/*
these variables have similar meaning like those in
the multiplication algorithm MulTwoWords
*/
TTMATH_ASSERT( c != 0 )
#ifndef __GNUC__
__asm
{
push eax
push edx
mov edx, [a]
mov eax, [b]
div dword ptr [c]
mov [r_], eax
mov [rest_], edx
pop edx
pop eax
}
#endif
#ifdef __GNUC__
__asm__ (
"divl %%ecx \n"
: "=a" (r_), "=d" (rest_)
: "0" (b), "1" (a), "c" (c)
: "cc" );
#endif
*r = r_;
*rest = rest_;
}
} //namespace
#endif //ifdef TTMATH_PLATFORM32
#endif //ifndef TTMATH_NOASM
#endif
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