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On 19 Feb 2015 21:45, Jiri Gaisler wrote: > On 02/17/2015 10:05 AM, Mike Frysinger wrote: > > On 17 Feb 2015 08:44, Jiri Gaisler wrote: > >> * float.c (get_accex) access FPU control and status words on x64 > > > > shouldn't you gut this file and use <fenv.h> instead for a portable method ? > > http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/fenv.h.html > > > > at the very least, you could cut over to <fpu_control.h> ... > > I will switch to fenv.h, but this will produce less accurate results > on Intel hardware. double on SPARC V8 has 53-bit mantissa while Intel has > both 53- and 64-bit, and 64-bit is default. To get accurate SPARC V8 FPU > operations, the Intel FPU should be switched to 53-bit, but the fenv.h > does not have an API for this. I guess we will have to live with that ... if you wanted to keep a little inline asm to just that particular bit twiddle, that should be fine. normally the sims are functional ... but i guess this part of the simulator is relying on the inaccuracies of floating point to trade for speed ? -mike
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