File psl-1983/3-1/util/nbig0.build artifact 4de290d1e9 part of check-in trunk

% NBIG0.BUILD - MLG, move BUILD info, add MC68000 case

Compiletime<<load syslisp;
	     Load Fast!-Vector;
             load inum;
	     load if!-system>>;

in "nbig0.red"$

% Now install the important globals for this machine

if_system(VAX, 
      <<
	BigFloatHi!*:=btimes2(bdifference(btwopower 67, btwopower 11), 
			btwopower 60);% Largest representable float.
	BigFloatLow!*:=BMinus BigFloatHi!*>>);

if_system(MC68000, 
	<<Setbits 30$  %/ Some BUG?
		% HP9836 sizes, range 10^-308 .. 10 ^308
			% i GUESS:
                        % 10^308 = 2 ^1025
                        % 15.8 digits, IEEE double ~56 bits
 	  BigFloatHi!*:=btimes2(BSUB1 BTWOPOWER 56,
			btwopower 961);% Largest representable float.
	  BigFloatLow!*:=BMinus BigFloatHi!*>>);

if_system(PDP10,
	<<
  	  BigFloatHi!*:=btimes2(bsub1 btwopower 62, btwopower 65);
	  BigFloatLow!*:=BMinus BigFloatHi!*>>);

  FloatSysHi!* := Float SysHi!*;
  FloatSysLow!* := Float SysLow!*;

END;