How to output 128 bits to the screen?

[jj2007]

it should be trivial to extend it to print 128-bit floats (I think the code is already there).

Great, show us

[jack]

I have minimal C experience otherwise I would take you up on the challenge, but you can convert a 128-bit float in exponential format to string using e113toasc, you just have to #define UNUSED 1

[jj2007]

I have minimal C experience

Me too

otherwise I would take you up on the challenge, but you can convert a 128-bit float in exponential format to string using e113toasc, you just have to #define UNUSED 1

There are many competent C/C++ coders here, so soon we'll see a DLL or LIB

[Mikl__]

Hi, jj2007, aw27, TWell, jack, FORTRAN!
Many thanks for the tips and helpness!

[jj2007]

I am working on a MasmBasic implementation. Here is cos(45):

Code: [Select]

QuadMath        7.071067811865475244008443621048490885e-01
Wolfram Alpha   7.071067811865475244008443621048490392e-01
Not bad, but it will require a GCC installation

[aw27]

I am working on a MasmBasic implementation. Here is cos(45):

Code: [Select]

QuadMath        7.071067811865475244008443621048490885e-01
Wolfram Alpha   7.071067811865475244008443621048490392e-01
Not bad, but it will require a GCC installation

Are you working on a BigNum library or on a way to print a 128 bit float to the screen? 

[jj2007]

The latter. Since GCC is a very popular compiler, and has the QuadMath library "out of the box", I am trying to get an assembler interface to that lib. Pretty useless, I know

Anyway, this works already:

        PrintLine "xmm0=", Tb$, Quad$(xmm0)
        PrintLine "MyReal16=", Tb$, Quad$(MyReal16)


But I must say that GCC QuadMath is not user-friendly. Badly documented, you need to read the header file to get info

[aw27]

The latter. Since GCC is a very popular compiler, and has the QuadMath library "out of the box", I am trying to get an assembler interface to that lib. Pretty useless, I know

Anyway, this works already:

        PrintLine "xmm0=", Tb$, Quad$(xmm0)
        PrintLine "MyReal16=", Tb$, Quad$(MyReal16)


But I must say that GCC QuadMath is not user-friendly. Badly documented, you need to read the header file to get info

Just note that SSE/AVX does not support 128-bit floats/Real16 and Intel has no current plans to implement. So, printing a xmm/ymm/zmm register looking for the 128-bit float in there, just prints garbage. Of course you can work with a software only solution.

[jj2007]

Of course you can work with a software only solution.

Exactly. It's called "QuadMath", and it works already, see above.

I attach a proggie that reads a RAD string (e.g. 45*PI/180=0.785398163397448309615660845819875721049292349843776455243) and spits out the cosine. As mentioned before, it needs C:\TDM-GCC-32\bin\libquadmath-0.dll

[Mikl__]

?

[jj2007]

Hi Mikl,

You were too fast - the first version had an exception handler, and instead of telling you that the DLL doesn't exist, it just threw an exception. Try the new attachment, and make sure you have GCC installed in the right location.

Interesting that you got non-printable characters, though. Which codepage? What do you get with chcp 65001?

[aw27]

I don't have GCC installed now.    

[Mikl__]

codepage=866

[jj2007]

Try this one, the "Dll not found" warning was broken

And yes, it won't work without C:\TDM-GCC-32\bin\libquadmath-0.dll

[jj2007]

Stupid question: Where am I wrong?

Code: [Select]

include \masm32\include\masm32rt.inc
.data
My4 REAL4 -1.23456789012345678901234567890e0
My8 REAL8 -1.23456789012345678901234567890e0

.code
start:
  mov esi, offset My4
  mov eax, [esi]
  sar eax, 23
  and eax, 11111111b ; 8 bits expo
  sub eax, 127  ; bias
  print str$(eax), 9, "expo R4", 13, 10

  mov esi, offset My8
  mov eax, [esi]
  sar eax, 52-32
  and eax, 11111111111b ; 11 bits expo
  sub eax, 1023 ; bias
  print str$(eax), 9, "expo R8", 13, 10
  exit
end start

Should be 2x0, right?

Code: [Select]

0       expo R4
41      expo R8