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Date: Thu, 20 Aug 2015 04:26:50 -0500
From: Segher Boessenkool <segher@kernel.crashing.org>
To: "Dominik 'Rathann' Mierzejewski" <dominik@greysector.net>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: error: 'asm' operand has impossible constraints when compiling
 gromacs 5.1 on PPC64 and PPC64LE with VSX SMD
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Hi,

On Thu, Aug 20, 2015 at 09:31:07AM +0200, Dominik 'Rathann' Mierzejewski wrote:
> /builddir/build/BUILD/gromacs-5.1/src/gromacs/simd/impl_ibm_vsx/impl_ibm_vsx.h:452:80: error: 'asm' operand has impossible constraints
>      __asm__ ("xvcvsxwdp %0,%1" : "=ww" (x) : "ww" ((__vector signed int) (ix)));
>                                                                                 ^

Please file a bug report; see  http://gcc.gnu.org/bugs/  .
Thanks!

(Btw, you forgot the most important piece of information -- the GCC
version).

Segher