[gmx-developers] double precision powerpc
lindahl at sbc.su.se
Fri Mar 3 14:55:55 CET 2006
> i noticed that kernels (in src/gmxlib/nonbonded/
> nb_kernel_ppc_altivec) optimized for powerpc have functions
> accepting floats. i don't see how this will work in double
> precision. the function prototype for the kernels is defined to
> take 'real' as parameters (nb_kerneltypes.h) and 'real' is
> typedef'ed to either float or double since my toolchain do not
> support 'real'.
The configuration script will stop you from ever compiling double
precision with altivec, so that can't happen.
> is someone already working to get this working? or is there another
> way to get ppc_altivec working with doubles?
Nope, the VMX/Altivec hardware unit only supports single precision
floating-point. Double precision Altivec is impossible until that
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