Win64 and GMP

Michael Abshoff Michael.Abshoff at
Wed Dec 27 15:17:03 CET 2006

Myria wrote:

Hello Myria,

> Currently, there is no Win64 (x86-64) build of GMP, and from the current
> situation, it would be difficult to make one.

You will find little love for Windows on this mailing list. If you check
the archives you will find plenty of evidence.

> As far as I know, the only compilers and assemblers that can do Win64 are
> Microsoft's and Intel's.  GAS can do x86-64 obviously, but it cannot
> currently do the mandatory function markup required by Win64 (the ".pdata"
> section).  GCC is a bigger problem - its x86-64 compiler assumes that all
> code is below 2 GB, an incorrect assumption on Win64.  (The correct
> assumption for Win64 is that a single module - EXE or DLL - is smaller
> than
> 2 GB, but modules can be anywhere.)
> I think with considerable work, GMP could be ported to Visual Studio.
> Probably the easiest way would be to use Cygwin so the scripts work, and
> modify the scripts to use different compiler options.  Not fun.
> For the assembly code, it's probably possible to use some script to
> translate the code to Intel syntax and insert the necessary markup
> required
> for MASM 64.  I don't know what m4 is.
> Has GMP been ported to Visual Studio before?

Yes, check out Brian Gladman's gmp4win page at - he has assembly support
for EMT64/Opterons. It works quite well.

> Melissa



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