Difference: FloatingPointUnit (14 vs. 15)

Revision 152022-11-03 - PeterSchmid

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  Bare FPU Words (Without C Math Library)
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+f+      ( r1 r2 -- r3 )     Add r1 to r2 giving the sum r3.
f-      ( r1 r2 -- r3 )     Subtract r2 from r1, giving r3.
f*      ( r1 r2 -- r3 )     Multiply r1 by r2 giving r3.
f/      ( r1 r2 -- r3 )     Divide r1 by r2, giving the quotient r3.
fsqrt   ( r1 -- r2 )        r2 is the square root of r1.
fabs    ( r1 -- r2 )        r2 is the absolute value of r1.
fnegate ( r1 -- r2 )        r2 is the negation of r1.

f0=     ( r -- ? )          flag is true if and only if r is equal to zero
f0<     ( r -- ? )          flag is true if and only if r is less than zero
f<      ( r1 r2 -- ? )      flag is true if and only if r1 is less than r2
->
>
+f+      ( r1 r2 -- r3 )     Add r1 to r2 giving the sum r3
f-      ( r1 r2 -- r3 )     Subtract r2 from r1, giving r3
f*      ( r1 r2 -- r3 )     Multiply r1 by r2 giving r3
f/      ( r1 r2 -- r3 )     Divide r1 by r2, giving the quotient r3
fsqrt   ( r1 -- r2 )        r2 is the square root of r1

fabs    ( r1 -- r2 )        r2 is the absolute value of r1
fnegate ( r1 -- r2 )        r2 is the negation of r1
fround  ( r1 -- r2 )        round r1 to an integral value using the "round to nearest" rule, giving r2

fflags@ ( -- u )            get the current value of the Floating Point Status/Control register FPSCR
fflags! ( -- u )            assign the given value to the Floating Point Status/Control register FPSCR

f0=     ( r -- ? )          flag is true if r is equal to zero
f0<     ( r -- ? )          flag is true if r is less than zero
f<      ( r1 r2 -- ? )      flag is true if r1 is less than r2
 f~      ( r1 r2 r3 -- ? )   If r3 is positive, flag is true if the absolute value of (r1 minus r2) is less than r3
                            If r3 is zero, flag is true if the implementation-dependent encoding of r1 and r2 are exactly identical 
                             (positive and negative zero are unequal if they have distinct encodings).
                            If r3 is negative, flag is true if the absolute value of (r1 minus r2) is less than the absolute value 
                            of r3 times the sum of the absolute values of r1 and r2.
-<
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+f>s     ( r -- n )          n is the single-cell signed-integer equivalent of the integer portion of r.
s>f     ( n -- r )          r is the floating-point equivalent of the single-cell value n.
->
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+f>s     ( r -- n )          n is the single-cell signed-integer equivalent of the integer portion of r
s>f     ( n -- r )          r is the floating-point equivalent of the single-cell value n
 f>fx    ( r -- d )          d is the fixed-point equivalent of the floating-point r
-<
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+fx>f    ( d -- r )          r is the floating-point equivalent of the fixed-point d.
->
>
+fx>f    ( d -- r )          r is the floating-point equivalent of the fixed-point d
-<
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+f.      ( r --  )           Display, with a trailing space, the top number using fixed-point notation:
->
>
+f.      ( r --  )           Display, with a trailing space, the top number using fixed-point notation
 fx*
fx/

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