ok2
0d22858aac
Add 14 double-cell words to boot.fth: D+, D-, DNEGATE, DABS, D0=, D0<, D=, D<, D2*, D2/, DMAX, DMIN, M+, DU<. Phase 3 (SM/REM, FM/MOD, */, */MOD) deferred: these words use DABS which calls DNEGATE→D+ with return-stack operations. When called from contexts with 2+ items already on the return stack, the nested >R/>R pattern causes a silent failure. Root cause needs investigation in the codegen return-stack handling before these can move to Forth. All 425 tests pass.
116 lines
3.4 KiB
Forth
116 lines
3.4 KiB
Forth
\ WAFER Bootstrap -- Forth definitions replacing Rust host functions.
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\ Loaded at startup after IR primitives are compiled.
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\ Compiled WASM with direct calls outperforms host function dispatch.
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\ ---------------------------------------------------------------
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\ Phase 1: Pure stack and memory operations
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\ ---------------------------------------------------------------
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\ 2OVER ( x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2 )
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: 2OVER 3 PICK 3 PICK ;
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\ 2ROT ( x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2 )
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: 2ROT 2>R 2SWAP 2R> 2SWAP ;
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\ WITHIN ( n lo hi -- flag ) true if lo <= n < hi (unsigned)
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: WITHIN OVER - >R - R> U< ;
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\ 2@ ( addr -- x1 x2 ) fetch double-cell, low addr = deeper stack
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: 2@ DUP CELL+ @ SWAP @ ;
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\ 2! ( x1 x2 addr -- ) store double-cell
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: 2! SWAP OVER ! CELL+ ! ;
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\ 2R@ stays as host function (needs direct return-stack access)
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\ FILL ( addr u char -- ) fill u bytes with char
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: FILL ROT ROT 0 ?DO 2DUP I + C! LOOP 2DROP ;
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\ CMOVE ( src dst u -- ) forward byte copy
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: CMOVE 0 ?DO OVER I + C@ OVER I + C! LOOP 2DROP ;
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\ CMOVE> ( src dst u -- ) backward byte copy (for overlap)
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: CMOVE>
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DUP 0= IF DROP 2DROP EXIT THEN
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1- >R
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BEGIN R@ 0< INVERT WHILE
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OVER R@ + C@ OVER R@ + C!
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R> 1- >R
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REPEAT
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R> DROP 2DROP ;
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\ MOVE ( src dst u -- ) smart copy (handles overlap)
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: MOVE
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DUP 0= IF DROP 2DROP EXIT THEN
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>R 2DUP U< IF R> CMOVE> ELSE R> CMOVE THEN ;
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\ ERASE ( addr u -- ) zero fill
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: ERASE 0 FILL ;
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\ BLANK ( addr u -- ) space fill
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: BLANK BL FILL ;
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\ /STRING ( addr u n -- addr+n u-n )
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: /STRING ROT OVER + ROT ROT - ;
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\ -TRAILING ( addr u -- addr u' ) remove trailing spaces
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: -TRAILING
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BEGIN DUP 0> WHILE
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2DUP + 1- C@ BL <> IF EXIT THEN
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1-
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REPEAT ;
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\ ---------------------------------------------------------------
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\ Phase 2: Double-cell arithmetic
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\ ---------------------------------------------------------------
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\ D+ ( d1 d2 -- d3 ) double-cell addition with carry
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: D+ >R SWAP >R DUP >R + DUP R> U< IF R> R> + 1+ ELSE R> R> + THEN ;
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\ DNEGATE ( d -- -d ) double-cell negate (two's complement)
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: DNEGATE INVERT SWAP INVERT SWAP 1 0 D+ ;
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\ D- ( d1 d2 -- d3 ) double-cell subtraction
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: D- DNEGATE D+ ;
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\ DABS ( d -- |d| ) double-cell absolute value
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: DABS DUP 0< IF DNEGATE THEN ;
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\ D0= ( d -- flag ) true if d is zero
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: D0= OR 0= ;
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\ D0< ( d -- flag ) true if d is negative
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: D0< NIP 0< ;
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\ D= ( d1 d2 -- flag ) true if d1 = d2
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: D= D- D0= ;
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\ D< ( d1 d2 -- flag ) true if d1 < d2 (signed)
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: D< D- D0< ;
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\ D2* ( d -- d*2 ) double-cell shift left
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: D2* 2DUP D+ ;
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\ D2/ ( d -- d/2 ) double-cell arithmetic shift right
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: D2/ DUP 1 AND 31 LSHIFT >R 2/ SWAP 1 RSHIFT R> OR SWAP ;
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\ DMAX ( d1 d2 -- d-max ) double-cell maximum
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: DMAX 2OVER 2OVER D< IF 2SWAP THEN 2DROP ;
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\ DMIN ( d1 d2 -- d-min ) double-cell minimum
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: DMIN 2OVER 2OVER D< INVERT IF 2SWAP THEN 2DROP ;
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\ M+ ( d n -- d+n ) add single to double
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: M+ S>D D+ ;
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\ DU< ( ud1 ud2 -- flag ) unsigned double-cell less-than
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: DU< ROT 2DUP = IF 2DROP U< ELSE U< NIP NIP THEN ;
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\ ---------------------------------------------------------------
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\ Phase 3: Mixed arithmetic (built on M* and UM/MOD host primitives)
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\ ---------------------------------------------------------------
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\ Phase 3 words (SM/REM, FM/MOD, */, */MOD) kept as Rust host functions
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\ for now due to return-stack depth interactions with DABS/DNEGATE.
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\ TODO: replace once return-stack nesting issue is resolved.
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