In article ,   
   Krishna Myneni   wrote:   
   >On 4/15/24 09:09, Anton Ertl wrote:   
   >> Krishna Myneni  writes:   
   >>> Failure from overflowing the   
   >>> fpu stack is silent.   
   >>   
   >> Reality check:   
   >>   
   >> VFX Forth 64 5.43 [build 0199] 2023-11-09 for Linux x64   
   >> © MicroProcessor Engineering Ltd, 1998-2023   
   >>   
   >> 1e 2e 3e 4e 5e 6e 7e  ok F:-7   
   >> 8e  ok   
   >> NDP Stack Fault: NDP SW = 0041   
   >> NDP Potential Exception: NDP SW = 0041   
   >>   
   >> SwiftForth also seems to notice it in some way, but does not report it   
   >> as an error:   
   >>   
   >> SwiftForth x64-Linux 4.0.0-RC87 24-Mar-2024   
   >> 1e 2e 3e 4e 5e 6e  ok   
   >> f. 6.00000000  ok   
   >>   
   >> SwiftForth x64-Linux 4.0.0-RC87 24-Mar-2024   
   >> 1e 2e 3e 4e 5e 6e 7e  ok   
   >> f.   
   >>    ok   
   >   
   >I tried overflowing the fpu stack in kforth32, and no exception is   
   >raised. Perhaps one needs to configure the fpu to raise an exception.   
   >Also tried it in C with an assembly procedure. The executable throws no   
   >exception.   
   >   
   >--   
   >Krishna   
   >   
   >== begin fpu-stack-overflow.4th ==   
   >  fpu-stack-overflow.4th   
   >\ for use with kforth32   
   >   
   >include ans-words   
   >include strings   
   >include modules   
   >include syscalls   
   >include mc   
   >include asm-x86   
   >   
   >code fpu-stack-overflow   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >         fld1,   
   >end-code   
   >   
   >fpu-stack-overflow   
   >   
   >   
   >== end fpu-stack-overflow.4th ==   
   >   
   >== begin example ==   
   >$ kforth32   
   >kForth-32 v 2.4.5       (Build: 2024-03-30)   
   >Copyright (c) 1998--2023 Krishna Myneni   
   >Contributions by: dpw gd mu bk abs tn cmb bg dnw   
   >Provided under the GNU Affero General Public License, v3.0 or later   
   >   
   >include fpu-stack-overflow   
   >  ok   
   >== end example ==   
   >   
   >   
   I tried this on ciforth. It crashes with the 10th item   
   not the 8th.   
      
   Groetjes Albert   
   --   
   Don't praise the day before the evening. One swallow doesn't make spring.   
   You must not say "hey" before you have crossed the bridge. Don't sell the   
   hide of the bear until you shot it. Better one bird in the hand than ten in   
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