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Use more compact loops.

This commit is contained in:
Sven Michael Klose 2020-11-01 22:59:07 +01:00 committed by greg-king5
parent 99c0815cdb
commit f59cb9af06
13 changed files with 90 additions and 94 deletions
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15
libsrc/atmos/read.s
View File

@ -20,18 +20,19 @@
sta ptr3
stx ptr3+1 ; save count as result
eor #$FF
sta ptr2
txa
eor #$FF
sta ptr2+1 ; Remember -count-1
inx
stx ptr2+1
tax
inx
stx ptr2 ; save count with each byte incremented separately
jsr popptr1 ; get buf
jsr popax ; get fd and discard
L1: inc ptr2
L1: dec ptr2
bnz L2
inc ptr2+1
dec ptr2+1
bze L9 ; no more room in buf
; If there are no more characters in BASIC's input buffer, then get a line from

14
libsrc/atmos/write.s
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@ -17,17 +17,17 @@
sta ptr3
stx ptr3+1 ; save count as result
eor #$FF
sta ptr2
txa
eor #$FF
sta ptr2+1 ; Remember -count-1
inx
stx ptr2+1
tax
inx
stx ptr2 ; save count with each byte incremented separately
jsr popptr1 ; get buf
jsr popax ; get fd and discard
L1: inc ptr2
L1: dec ptr2
bne L2
inc ptr2+1
dec ptr2+1
beq L9
L2: ldy #0
lda (ptr1),y

4
libsrc/cbm/read.s
View File

@ -106,9 +106,9 @@
; Decrement the count
@L3: inc ptr2
@L3: dec ptr2
bne @L0
inc ptr2+1
dec ptr2+1
bne @L0
beq done ; Branch always

10
libsrc/cbm/rwcommon.s
View File

@ -21,11 +21,11 @@
.proc rwcommon
eor #$FF
sta ptr2
txa
eor #$FF
sta ptr2+1 ; Remember -count-1
inx
stx ptr2+1
tax
inx
stx ptr2 ; Save count with each byte incremented separately
jsr popptr1 ; Get buf to ptr1, Y=0 by call

4
libsrc/cbm/write.s
View File

@ -83,9 +83,9 @@
; Decrement count
@L2: inc ptr2
@L2: dec ptr2
bne @L0
inc ptr2+1
dec ptr2+1
bne @L0
; Wrote all chars or disk full. Close the output channel

15
libsrc/common/memcmp.s
View File

@ -13,11 +13,11 @@ _memcmp:
; Calculate (-count-1) and store it into ptr3. This is some overhead here but
; saves time in the compare loop
eor #$FF
sta ptr3
txa
eor #$FF
sta ptr3+1
inx
stx ptr3+1
tax
inx
stx ptr3 ; Save count with each byte incremented separately
; Get the pointer parameters
@ -33,7 +33,7 @@ _memcmp:
; Head of compare loop: Test for the end condition
Loop: inx ; Bump low byte of (-count-1)
Loop: dex ; Bump low byte of (-count-1)
beq BumpHiCnt ; Jump on overflow
; Do the compare
@ -53,7 +53,7 @@ Comp: lda (ptr1),y
; Entry on low counter byte overflow
BumpHiCnt:
inc ptr3+1 ; Bump high byte of (-count-1)
dec ptr3+1 ; Bump high byte of (-count-1)
bne Comp ; Jump if not done
jmp return0 ; Count is zero, areas are identical
@ -67,4 +67,3 @@ NotEqual:
Greater:
ldx #$01 ; Make result positive
rts

22
libsrc/common/strncat.s
View File

@ -5,17 +5,17 @@
; char* strncat (char* dest, const char* src, size_t n);
;
.export _strncat
.import popax, popptr1
.importzp ptr1, ptr2, ptr3, tmp1, tmp2
.macpack cpu
.export _strncat
.import popax, popptr1
.importzp ptr1, ptr2, ptr3, tmp1, tmp2
.macpack cpu
_strncat:
eor #$FF ; one's complement to count upwards
sta tmp1
txa
eor #$FF
sta tmp2
inx
stx tmp2
tax
inx
stx tmp1 ; save count with each byte incremented separately
jsr popptr1 ; get src
@ -49,9 +49,9 @@ L2: sty ptr2
L3: ldy #0
ldx tmp1 ; low counter byte
L4: inx
L4: dex
bne L5
inc tmp2
dec tmp2
beq L6 ; jump if done
L5: lda (ptr1),y
sta (ptr2),y

18
libsrc/common/strncpy.s
View File

@ -10,11 +10,11 @@
.proc _strncpy
eor #$FF
sta tmp1
txa
eor #$FF
sta tmp2 ; Store -size - 1
inx
stx tmp2
tax
inx
stx tmp1 ; save count with each byte incremented separately
jsr popptr1 ; get src
jsr popax ; get dest
@ -26,9 +26,9 @@
ldx tmp1 ; Load low byte of ones complement of size
ldy #$00
L1: inx
L1: dex
bne L2
inc tmp2
dec tmp2
beq L9
L2: lda (ptr1),y ; Copy one character
@ -42,7 +42,7 @@ L2: lda (ptr1),y ; Copy one character
; Fill the remaining bytes.
L3: inx ; Counter low byte
L3: dex ; Counter low byte
beq L6 ; Branch on overflow
L4: sta (ptr2),y ; Clear one byte
L5: iny ; Bump pointer
@ -52,7 +52,7 @@ L5: iny ; Bump pointer
; Bump the counter high byte
L6: inc tmp2
L6: dec tmp2
bne L4
; Done, return dest

20
libsrc/common/strnicmp.s
View File

@ -15,17 +15,11 @@
_strnicmp:
_strncasecmp:
; Convert the given counter value in a/x from a downward counter into an
; upward counter, so we can increment the counter in the loop below instead
; of decrementing it. This adds some overhead now, but is cheaper than
; executing a more complex test in each iteration of the loop. We do also
; correct the value by one, so we can do the test on top of the loop.
eor #$FF
sta ptr3
txa
eor #$FF
sta ptr3+1
inx
stx ptr3+1
tax
inx
stx ptr3 ; save count with each byte incremented separately
; Get the remaining arguments
@ -40,7 +34,7 @@ _strncasecmp:
; Start of compare loop. Check the counter.
Loop: inc ptr3
Loop: dec ptr3
beq IncHi ; increment high byte
; Compare a byte from the strings
@ -79,7 +73,7 @@ L2: ldx tmp1
; Increment hi byte
IncHi: inc ptr3+1
IncHi: dec ptr3+1
bne Comp ; jump if counter not zero
; Exit code if strings are equal. a/x not set

16
libsrc/conio/vcprintf.s
View File

@ -47,12 +47,12 @@ outdesc: ; Static outdesc structure
out: jsr popax ; count
sta ptr2
eor #$FF
sta outdesc+6
txa
sta ptr2+1
eor #$FF
sta outdesc+7
stx ptr2+1
inx
stx outdesc+7
tax
inx
stx outdesc+6
jsr popptr1 ; buf
@ -74,7 +74,7 @@ out: jsr popax ; count
; Loop outputting characters
@L1: inc outdesc+6
@L1: dec outdesc+6
beq @L4
@L2: ldy tmp1
lda (ptr1),y
@ -85,7 +85,7 @@ out: jsr popax ; count
jsr _cputc
jmp @L1
@L4: inc outdesc+7
@L4: dec outdesc+7
bne @L2
rts

15
libsrc/geos-common/drivers/fio_module.s
View File

@ -94,11 +94,12 @@ _read:
; popax - fd, must be == to the above one
; return -1+__oserror or number of bytes read
eor #$ff
sta ptr1
txa
eor #$ff
sta ptr1+1 ; -(# of bytes to read)-1
inx
stx ptr1+1
tax
inx
stx ptr1 ; save count with each byte incremented separately
jsr popax
sta ptr2
stx ptr2+1 ; buffer ptr
@ -152,9 +153,9 @@ _read:
beq @done ; yes, we're done
jmp __mappederrno ; no, we're screwed
@L3: inc ptr1 ; decrement the count
@L3: dec ptr1 ; decrement the count
bne @L0
inc ptr1+1
dec ptr1+1
bne @L0
@done:

17
libsrc/osic1p/bootstrap.s
View File

@ -50,16 +50,17 @@ LINEDIST = $20 ; Offset in video RAM between two lines
ldx #>load_addr
sta load
stx load+1
lda #<load_size
eor #$FF
sta count ; store (-size - 1)
lda #>load_size
eor #$FF
sta count+1
L1: inc count ; pre-count one's-complement upwards
ldx #<load_size
inx
stx count
ldx #>load_size
inx
stx count+1 ; save size with each byte incremented separately
L1: dec count ; pre-count one's-complement upwards
bnz L2
inc count+1
dec count+1
bze L3
L2: jsr GETCHAR ; (doesn't change .Y)
sta (load),y

14
libsrc/telestrat/write.s
View File

@ -13,11 +13,11 @@
sta ptr3
stx ptr3+1 ; save count as result
eor #$FF
sta ptr2
txa
eor #$FF
sta ptr2+1 ; remember -count-1
inx
stx ptr2+1
tax
inx
stx ptr2 ; save count with each byte incremented separately
jsr popptr1 ; get buf
jsr popax ; get fd and discard
@ -51,9 +51,9 @@ next:
rts
L1: inc ptr2
L1: dec ptr2
bne L2
inc ptr2+1
dec ptr2+1
beq L9
L2: ldy #0
lda (ptr1),y