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forth: remove 0 and 1 constants

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They do save space (nearly 100b), but they complicate our Forth-ification
process. We'll re-add them later.
This commit is contained in:
Virgil Dupras 2020-03-26 11:05:58 -04:00
parent 6eaabb9bbe
commit 42abbe75aa
2 changed files with 18 additions and 35 deletions
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2
emul/forth/stage.c
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@ -29,7 +29,7 @@ trouble of compiling defs to binary.
//#define DEBUG
// in sync with glue.asm
#define RAMSTART 0x8a0
#define RAMSTART 0x890
#define STDIO_PORT 0x00
// To know which part of RAM to dump, we listen to port 2, which at the end of
// its compilation process, spits its HERE addr to port 2 (MSB first)

51
forth/forth.asm
View File

@ -167,23 +167,25 @@ INTERPRET:
.dw FIND_
.dw CSKIP
.dw FBR
.db 18
.db 22
; It's a word, execute it
; For now, we only have one flag, let's take advantage of
; this to keep code simple.
.dw ONE ; Bit 0 on
.dw NUMBER ; Bit 0 on
.dw 1
.dw FLAGS_
.dw STORE
.dw EXECUTE
.dw ZERO ; Bit 0 off
.dw NUMBER ; Bit 0 off
.dw 0
.dw FLAGS_
.dw STORE
.dw BBR
.db 25
.db 29
; FBR mark, try number
.dw PARSEI
.dw BBR
.db 30
.db 34
; infinite loop
; *** Collapse OS lib copy ***
@ -628,7 +630,8 @@ EXIT:
.db 4
QUIT:
.dw compiledWord
.dw ZERO
.dw NUMBER
.dw 0
.dw FLAGS_
.dw STORE
.dw .private
@ -992,7 +995,8 @@ ISWS:
.dw NUMBER
.dw 33
.dw CMP
.dw ONE
.dw NUMBER
.dw 1
.dw PLUS
.dw NOT
.dw EXIT
@ -1043,17 +1047,19 @@ WORD:
; branch mark
.dw OVER ; ( a c a )
.dw STORE ; ( a )
.dw ONE ; ( a 1 )
.dw NUMBER ; ( a 1 )
.dw 1
.dw PLUS ; ( a+1 )
.dw CIN ; ( a c )
.dw DUP ; ( a c c )
.dw ISWS ; ( a c f )
.dw CSKIP ; ( a c )
.dw BBR
.db 18 ; here - mark
.db 20 ; here - mark
; at this point, we have ( a WS )
.dw DROP
.dw ZERO
.dw NUMBER
.dw 0
.dw SWAP ; ( 0 a )
.dw STORE ; ()
.dw NUMBER
@ -1374,32 +1380,9 @@ MULT:
push hl
jp next
; It might look peculiar to have specific words for "0" and "1", but although
; it slightly beefs ups the ASM part of the binary, this one-byte-save-per-use
; really adds up when we compare total size.
.db "0"
.dw $-MULT
.db 1
ZERO:
.dw nativeWord
ld hl, 0
push hl
jp next
.db "1"
.dw $-ZERO
.db 1
ONE:
.dw nativeWord
ld hl, 1
push hl
jp next
; ( a1 a2 -- b )
.db "SCMP"
.dw $-ONE
.dw $-MULT
.db 4
SCMP:
.dw nativeWord