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| 1 : | anton | 1.1 | \ High level floating point 14jan94py |
| 2 : | |||
| 3 : | : f, ( f -- ) here 1 floats allot f! ; | ||
| 4 : | |||
| 5 : | anton | 1.2 | \ !! have create produce faligned pfas |
| 6 : | anton | 1.1 | : fconstant ( r -- ) |
| 7 : | pazsan | 1.4 | falign here f, Create A, |
| 8 : | DOES> @ f@ ; | ||
| 9 : | anton | 1.1 | |
| 10 : | : fvariable | ||
| 11 : | pazsan | 1.4 | falign here 0. d>f f, AConstant ; |
| 12 : | anton | 1.1 | |
| 13 : | : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ; | ||
| 14 : | |||
| 15 : | : FLit ( -- r ) r> faligned dup f@ float+ >r ; | ||
| 16 : | : FLiteral ( r -- ) postpone FLit falign f, ; immediate | ||
| 17 : | |||
| 18 : | &16 Value precision | ||
| 19 : | : set-precision to precision ; | ||
| 20 : | |||
| 21 : | : scratch ( r -- addr len ) | ||
| 22 : | pad precision - precision ; | ||
| 23 : | |||
| 24 : | : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; | ||
| 25 : | |||
| 26 : | : -zeros ( addr u -- addr' u' ) | ||
| 27 : | BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ; | ||
| 28 : | |||
| 29 : | pazsan | 1.4 | : f$ ( f -- n ) scratch represent 0= |
| 30 : | IF 2drop scratch 3 min type rdrop EXIT THEN | ||
| 31 : | IF '- emit THEN ; | ||
| 32 : | |||
| 33 : | : f. ( r -- ) f$ dup >r 0< | ||
| 34 : | IF '0 emit | ||
| 35 : | anton | 1.1 | ELSE scratch r@ min type r@ precision - zeros THEN |
| 36 : | '. emit r@ negate zeros | ||
| 37 : | scratch r> 0 max /string 0 max -zeros type space ; | ||
| 38 : | benschop | 1.3 | \ I'm afraid this does not really implement ansi semantics wrt precision. |
| 39 : | \ Shouldn't precision indicate the number of places shown after the point? | ||
| 40 : | anton | 1.1 | |
| 41 : | pazsan | 1.4 | : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
| 42 : | anton | 1.1 | scratch r@ min type '. emit scratch r> /string type |
| 43 : | 'E emit r> . ; | ||
| 44 : | |||
| 45 : | pazsan | 1.4 | : fs. ( r -- ) f$ 1- |
| 46 : | scratch over c@ emit '. emit 1 /string type | ||
| 47 : | 'E emit . ; | ||
| 48 : | |||
| 49 : | : fnumber ( string -- r / ) | ||
| 50 : | ?dup IF dup count >float 0= | ||
| 51 : | IF defers notfound | ||
| 52 : | ELSE drop state @ | ||
| 53 : | IF postpone FLiteral THEN THEN THEN ; | ||
| 54 : | anton | 1.1 | |
| 55 : | ' fnumber IS notfound | ||
| 56 : | |||
| 57 : | 1e0 fasin 2e0 f* fconstant pi |
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