izaya/collapseos
1
0
Fork 0
mirror of https://github.com/hsoft/collapseos.git synced 2024-11-23 20:18:04 +11:00
Code Issues Releases Wiki Activity

forth: a little bit of ASM routine inlining

Browse Source
This commit is contained in:
Virgil Dupras 2020-03-30 21:33:37 -04:00
parent 5c03b33982
commit e5ab0dd1c9
3 changed files with 13 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
emul/forth/stage.c
View File

@ -29,7 +29,7 @@ trouble of compiling defs to binary.
//#define DEBUG
// in sync with glue.asm
#define RAMSTART 0x850
#define RAMSTART 0x840
#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)

BIN
emul/forth/z80c.bin
View File

Binary file not shown.

41
forth/forth.asm
View File

@ -190,17 +190,6 @@ forthMain:
.bootName:
.db "BOOT", 0
; copy (HL) into DE, then exchange the two, utilising the optimised HL instructions.
; ld must be done little endian, so least significant byte first.
intoHL:
push de
ld e, (hl)
inc hl
ld d, (hl)
ex de, hl
pop de
ret
; Compares strings pointed to by HL and DE until one of them hits its null char.
; If equal, Z is set. If not equal, Z is reset. C is set if HL > DE
strcmp:
@ -225,19 +214,6 @@ strcmp:
; early, set otherwise)
ret
; Given a string at (HL), move HL until it points to the end of that string.
strskip:
push bc
ex af, af'
xor a ; look for null char
ld b, a
ld c, a
cpir ; advances HL regardless of comparison, so goes one too far
dec hl
ex af, af'
pop bc
ret
; Parse string at (HL) as a decimal value and return value in DE.
; Reads as many digits as it can and stop when:
; 1 - A non-digit character is read
@ -376,8 +352,10 @@ find:
dec de \ dec de \ dec de ; prev field
push de ; --> lvl 2
ex de, hl
call intoHL
ex de, hl ; DE contains prev offset
ld e, (hl)
inc hl
ld d, (hl)
; DE contains prev offset
pop hl ; <-- lvl 2
; HL is prev field's addr
; Is offset zero?
@ -543,8 +521,13 @@ numberWord:
litWord:
ld hl, (IP)
push hl
call strskip
inc hl ; after null termination
; Skip to null char
xor a ; look for null char
ld b, a
ld c, a
cpir
; CPIR advances HL regardless of comparison, so goes one char after
; NULL. This is good, because that's what we want...
ld (IP), hl
jp next
@ -558,5 +541,5 @@ litWord:
.dw $-EXECUTE
.db 5
; Offset: 0249
; Offset: 0237
.out $