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kas1e
UDivMod32 ?
Posted on: 2013/3/24 13:41    #1
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Did utility.library on aos4 have UDivMod32() function as it was in older utility.libraryes ?

I didn't find it in aos4 autodocs, but i find a notes about this in:

SDK:include/include_h/pragmas/utility_pragmas.h
SDK:include/include_h/inline/utility.h
SDK:include/include_h/clib/utility_protos.h

So questions is:

1). Why it disappear from utility.library autodocs
2). Is it available only for clib2, but not for newlib ?
3). How to compile/link such example on os4:

#include <proto/intuition.h>

main()
{
     ULONG aa;
     aa=UDivMod32(var1,var2);
}


As it "simply" divide, then maybe something like this should be fine enough:

main()
{
       ULONG aa;
       aa= (ULONG) (var1 / var2);
}


?

4). What faster will be: ulong + / from gcc, or UDivMod32 itself when avail ? I assume UDivMod32 can be faster for os3, as it can be done on asm in utility.library, or speed is the same and i can safely replace it everythere ?

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Re: UDivMod32 ?
Posted on: 2013/3/24 13:49    #2
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Remainder = UDivMod32( Dividend, Divisor );

some thing like:

Remainder = Dividend % Divisor ;

I guess it's due to lack of FPU on MC680X0.


#ifdef __AmigaOS4__
#define UDivMod32( Dividend, Divisor ) Dividend % Divisor
#endif
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 13:55    #3
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But 68k gcc for example understand pretty well "/", so i can compile it like:

Quote:

quotient = (ULONG)(num / div);


Is then there any point to use UDivMod32 at all for 68k ? I assume GCC will carry about it even if no FPU present ? So question still valid, what way will be faster, UDivMod32 or gcc-divide ?

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Re: UDivMod32 ?
Posted on: 2013/3/24 14:02    #4
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Quote:
As it "simply" divide, then maybe something like this should be fine enough:


no mod and div is not the same.


Resized Image

/ (div) gives you have many whole you have, while % (mod) gives you the fraction of the divider.
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 14:04    #5
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What about those ones: UMult32() and SDivMod32() ? I currently have it like:

Quote:

#define UDivMod32(x,y) x % y // UDivMod32() replacement (so on os3 it still be used as it)
#define UMult32(x,y) x * y // UMult32() replacement (so on os3 it still be used)
#define SDivMod32 ??


UDivMod32 is unsigned, SDivMod32 is signed, so need to care about it in #define as well

Quote:

/ (div) gives you have many whole you have, while % (mod) gives you the fraction of the divider.


Right, old utility autodoc says:
Quote:

UDivMod32 -- unsigned 32 by 32 bit division and modulus
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Re: UDivMod32 ?
Posted on: 2013/3/24 14:18    #6
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Mod = modulus

U is unsigned, S is signed.

The same macro will work on both, if you won't be 100% correct you put some casting in there.
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 14:22    #7
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Yep, i do it like:

#ifdef __amigaos4__
#define UDivMod32(x,y)( (ULONG) x % (ULONG) y ) // UDivMod32() replacement (so on os3 it still be used as it)
#define SDivMod32(x,y) ( (LONG) x % (LONG) y )  // SDivMode32() replacement (so on os3 it still be used)
#define UMult32(x,y) ( (ULONG) x * (ULONG) y )  // UMult32() replacement (so on os3 it still be used)
#endif


Thanks
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Re: UDivMod32 ?
Posted on: 2013/3/24 14:23    #8
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http://amigadev.elowar.com/read/ADCD_ ... cs_3._guide/node05AD.html

It looks like it uses D0 and D1 as result

RESULTS
D0 quotient - signed 32 quotient of the division.
D1 remainder - signed 32 remainder of the division.
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 14:28    #9
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Quote:

It looks like it uses D0 and D1 as result


In the code SDivMod32 uses like this:

short line,x,y;

x=input->gpi_Mouse.X+gadget->LeftEdge;
y=input->gpi_Mouse.Y+gadget->TopEdge;

..some more fun games with x,y and then:

line=SDivMod32(y-data->text_dims.Top,data->text_height);


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Re: UDivMod32 ?
Posted on: 2013/3/24 14:49    #10
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I think it's the line number calculation so it should be divided not modulus.
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 14:57    #11
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But autodoc cleary says "division and modulus". Just signed, not unsigned
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Re: UDivMod32 ?
Posted on: 2013/3/24 15:58    #12
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unsigned int32 reg68k[16];

#define getreg(r) reg68k[r]

unsigned int32 UDivMod32( unsigned int32 Dividend, unsigned int32 Divisor )
{
reg68k[1] = (unsigned int32) Dividend % Divisor;
reg68k[0] = (unsigned int32) Dividend / Divisor;
return reg68k[0];
}

singned int32 SDivMod32( singed int32 Dividend, signed int32 Divisor )
{
reg68k[1] = (unsigned int32) Dividend % Divisor;
reg68k[0] = (unsigned int32) Dividend / Divisor;
return (singned int32) reg68k[0];
}
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 16:02    #13
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Why there "#define getreg(r) reg68k[r]" if getreg() never used ?
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Re: UDivMod32 ?
Posted on: 2013/3/24 16:04    #14
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http://amigadev.elowar.com/read/ADCD_ ... cs_3._guide/node05B5.html

vs

http://amigadev.elowar.com/read/ADCD_ ... cs_3._guide/node05AD.html
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Re: UDivMod32 ?
Posted on: 2013/3/24 16:09    #15
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@Kas1e

if getreg is not used then, you can use simple macros, if get reg is used you need to emulate registers, and support Modula.
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 16:10    #16
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@liveforit
Still dont get it :)
I mean you do:

#define getreg(r) reg68k[r]

But you never user getreg. I.e. your define is define for getreg. Maybe you mean #define reg68k[r] getreg(r) ? Then getreg is SASC only function, which we need to avoid as well.

Or you just copy+paste that snipped from some place ?

Quote:

if get reg is used you need to emulate registers, and support Modula.


? Modula ? Why i need to worry about Modula, if its all about GCC only? :) Need fully working GCC replacement, without involving sasc-specific parts, pure cross-platform gcc.
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Re: UDivMod32 ?
Posted on: 2013/3/24 16:15    #17
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Or else you might do a version that returns a struct.

Struct {
uint32 div;
Uint32 mod;
} UDivMod;

Struct UDivMod _UDivMod32_( unsigned int32 Dividend, unsigned int32 Divisor )
{
Struct UDivMod ret;
ret.div= (unsigned int32) Dividend / Divisor;
ret.mod= (unsigned int32) Dividend % Divisor;
return ret;
}
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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 16:18    #18
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Quote:

Or else you might do a version that returns a struct.


No main code changes should be done in , should be just 1:1 and 100% replacements which do and return the same as old os3 originals. Currently i just do it like:

Quote:

#define UDivMod32(x,y)( (ULONG) x % (ULONG) y ) // UDivMod32() replacement (so on os3 it still be used as it)
#define SDivMod32(x,y) ( (LONG) x % (LONG) y ) // SDivMod32() replacement (so on os3 it still be used)
#define UMult32(x,y) ( (ULONG) x * (ULONG) y ) // UMult32() replacement (so on os3 it still be used)
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Re: UDivMod32 ?
Posted on: 2013/3/24 16:18    #19
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Kas1e

These are 68k function for use in assembler only (multiple return registers) (possible there may be compiler spscific glue to us them with C but not needed)

in clibrary code the clibrary has it's own equivalents "/" and "%" replace all usages of them if you want portable code

End of story


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kas1e
Re: UDivMod32 ?
Posted on: 2013/3/24 16:20    #20
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@Andy
Right, already done it like this then.

ps. what is strange, its why we still references to them in os4 sdk (pretty a lot should to say).
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