mirror of https://github.com/cc65/cc65.git
Apply faster popptr1 to functions and/or use register instead of stack to save accu.
This commit is contained in:
IrgendwerA8
parent
81b3c16c7e
commit
d7da827be8
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@ -6,8 +6,8 @@
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.export tosumulax, tosmulax
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.import mul8x16, mul8x16a ; in mul8.s
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.import popsreg
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.importzp sreg, tmp1, ptr4
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.import popptr1
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.importzp tmp1, ptr1, ptr4
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;---------------------------------------------------------------------------
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@ -19,12 +19,12 @@ tosumulax:
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txa ; High byte zero
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beq @L3 ; Do 8x16 multiplication if high byte zero
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stx ptr4+1 ; Save right operand
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jsr popsreg ; Get left operand
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jsr popptr1 ; Get left operand (Y=0 by popptr1)
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; Do ptr4:ptr4+1 * sreg:sreg+1 --> AX
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; Do ptr4:ptr4+1 * ptr1:ptr1+1 --> AX
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lda #0
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ldx sreg+1 ; Get high byte into register for speed
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tya ; A = 0
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ldx ptr1+1 ; check if lhs is 8 bit only
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beq @L4 ; -> we can do 8x16 after swap
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sta tmp1
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ldy #16 ; Number of bits
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@ -34,12 +34,12 @@ tosumulax:
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@L0: bcc @L1
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clc
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adc sreg
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pha
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txa ; hi byte of left op
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adc ptr1
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tax
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lda ptr1+1 ; hi byte of left op
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adc tmp1
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sta tmp1
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pla
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txa
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@L1: ror tmp1
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ror a
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@ -59,9 +59,9 @@ tosumulax:
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; If the high byte of rhs is zero, swap the operands and use the 8x16
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; routine. On entry, A and X are zero
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@L4: ldy sreg ; Save right operand (8 bit)
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@L4: ldy ptr1 ; Save right operand (8 bit)
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ldx ptr4 ; Copy left 16 bit operand to right
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stx sreg
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stx ptr1
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ldx ptr4+1 ; Don't store, this is done later
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sty ptr4 ; Copy low 8 bit of right op to left
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ldy #8
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@ -6,8 +6,8 @@
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.export tosumula0, tosmula0
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.export mul8x16, mul8x16a
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.import popsreg
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.importzp sreg, ptr4
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.import popptr1
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.importzp ptr1, ptr4
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;---------------------------------------------------------------------------
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@ -16,11 +16,11 @@
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tosmula0:
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tosumula0:
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sta ptr4
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mul8x16:jsr popsreg ; Get left operand
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mul8x16:jsr popptr1 ; Get left operand (Y=0 by popptr1)
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lda #0 ; Clear byte 1
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tya ; Clear byte 1
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ldy #8 ; Number of bits
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ldx sreg+1 ; Get into register for speed
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ldx ptr1+1 ; check if lhs is 8 bit only
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beq mul8x8 ; Do 8x8 multiplication if high byte zero
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mul8x16a:
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sta ptr4+1 ; Clear byte 2
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@ -29,12 +29,12 @@ mul8x16a:
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@L0: bcc @L1
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clc
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adc sreg
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pha
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txa ; hi byte of left op
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adc ptr1
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tax
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lda ptr1+1 ; hi byte of left op
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adc ptr4+1
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sta ptr4+1
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pla
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txa
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@L1: ror ptr4+1
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ror a
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@ -52,7 +52,7 @@ mul8x8:
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lsr ptr4 ; Get first bit into carry
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@L0: bcc @L1
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clc
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adc sreg
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adc ptr1
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@L1: ror
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ror ptr4
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dey
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@ -15,11 +15,11 @@
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rol ptr1+1
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clc
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adc ptr1
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pha
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tay
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txa
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adc ptr1+1
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tax
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pla
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tya
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rts
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.endproc
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@ -17,11 +17,11 @@
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rol ptr1+1
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clc
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adc ptr1
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pha
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tay
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txa
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adc ptr1+1
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tax
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pla
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tya
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rts
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.endproc
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@ -20,12 +20,12 @@
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rol ptr1+1 ; * 8
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sec
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sbc ptr1
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pha
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tay
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txa
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eor #$ff
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adc ptr1+1 ; * (8 - 1)
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tax
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pla
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tya
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rts
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.endproc
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@ -20,11 +20,11 @@
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rol ptr1+1 ; * 8
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clc
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adc ptr1 ; * (8+1)
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pha
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tay
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txa
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adc ptr1+1
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tax
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pla
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tya
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rts
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.endproc
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