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https://github.com/irmen/prog8.git
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681 lines
13 KiB
NASM
681 lines
13 KiB
NASM
; --- low level floating point assembly routines for the C64
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FL_ONE_const .byte 129 ; 1.0
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FL_ZERO_const .byte 0,0,0,0,0 ; 0.0
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FL_LOG2_const .byte $80, $31, $72, $17, $f8 ; log(2)
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floats_store_reg .byte 0 ; temp storage
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ub2float .proc
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; -- convert ubyte in SCRATCH_ZPB1 to float at address A/Y
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; clobbers A, Y
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stx P8ZP_SCRATCH_REG
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy P8ZP_SCRATCH_B1
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lda #0
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jsr GIVAYF
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_fac_to_mem ldx P8ZP_SCRATCH_W2
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ldy P8ZP_SCRATCH_W2+1
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jsr MOVMF
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ldx P8ZP_SCRATCH_REG
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rts
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.pend
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b2float .proc
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; -- convert byte in SCRATCH_ZPB1 to float at address A/Y
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; clobbers A, Y
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stx P8ZP_SCRATCH_REG
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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lda P8ZP_SCRATCH_B1
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jsr FREADSA
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jmp ub2float._fac_to_mem
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.pend
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uw2float .proc
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; -- convert uword in SCRATCH_ZPWORD1 to float at address A/Y
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stx P8ZP_SCRATCH_REG
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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lda P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr GIVUAYFAY
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jmp ub2float._fac_to_mem
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.pend
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w2float .proc
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; -- convert word in SCRATCH_ZPWORD1 to float at address A/Y
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stx P8ZP_SCRATCH_REG
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy P8ZP_SCRATCH_W1
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lda P8ZP_SCRATCH_W1+1
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jsr GIVAYF
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jmp ub2float._fac_to_mem
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.pend
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cast_from_uw .proc
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; -- uword in A/Y into float var at (P8ZP_SCRATCH_W2)
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stx P8ZP_SCRATCH_REG
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jsr GIVUAYFAY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_w .proc
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; -- word in A/Y into float var at (P8ZP_SCRATCH_W2)
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stx P8ZP_SCRATCH_REG
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jsr GIVAYFAY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_ub .proc
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; -- ubyte in Y into float var at (P8ZP_SCRATCH_W2)
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stx P8ZP_SCRATCH_REG
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jsr FREADUY
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jmp ub2float._fac_to_mem
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.pend
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cast_from_b .proc
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; -- byte in A into float var at (P8ZP_SCRATCH_W2)
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stx P8ZP_SCRATCH_REG
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jsr FREADSA
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jmp ub2float._fac_to_mem
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.pend
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cast_as_uw_into_ya .proc ; also used for float 2 ub
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; -- cast float at A/Y to uword into Y/A
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jsr MOVFM
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jmp cast_FAC1_as_uw_into_ya
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.pend
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cast_as_w_into_ay .proc ; also used for float 2 b
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; -- cast float at A/Y to word into A/Y
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jsr MOVFM
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jmp cast_FAC1_as_w_into_ay
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.pend
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cast_FAC1_as_uw_into_ya .proc ; also used for float 2 ub
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; -- cast fac1 to uword into Y/A
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stx P8ZP_SCRATCH_REG
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jsr GETADR ; into Y/A
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ldx P8ZP_SCRATCH_REG
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rts
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.pend
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cast_FAC1_as_w_into_ay .proc ; also used for float 2 b
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; -- cast fac1 to word into A/Y
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stx P8ZP_SCRATCH_REG
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jsr AYINT
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ldy $64
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lda $65
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ldx P8ZP_SCRATCH_REG
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rts
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.pend
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stack_b2float .proc
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; -- b2float operating on the stack
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inx
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lda P8ESTACK_LO,x
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stx P8ZP_SCRATCH_REG
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jsr FREADSA
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jmp push_fac1._internal
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.pend
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stack_w2float .proc
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; -- w2float operating on the stack
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inx
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ldy P8ESTACK_LO,x
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lda P8ESTACK_HI,x
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stx P8ZP_SCRATCH_REG
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jsr GIVAYF
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jmp push_fac1._internal
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.pend
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stack_ub2float .proc
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; -- ub2float operating on the stack
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inx
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lda P8ESTACK_LO,x
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stx P8ZP_SCRATCH_REG
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tay
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lda #0
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jsr GIVAYF
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jmp push_fac1._internal
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.pend
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stack_uw2float .proc
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; -- uw2float operating on the stack
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inx
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lda P8ESTACK_LO,x
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ldy P8ESTACK_HI,x
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stx P8ZP_SCRATCH_REG
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jsr GIVUAYFAY
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jmp push_fac1._internal
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.pend
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stack_float2w .proc ; also used for float2b
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jsr pop_float_fac1
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stx P8ZP_SCRATCH_REG
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jsr AYINT
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ldx P8ZP_SCRATCH_REG
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lda $64
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sta P8ESTACK_HI,x
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lda $65
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sta P8ESTACK_LO,x
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dex
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rts
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.pend
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stack_float2uw .proc ; also used for float2ub
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jsr pop_float_fac1
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stx P8ZP_SCRATCH_REG
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jsr GETADR
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ldx P8ZP_SCRATCH_REG
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sta P8ESTACK_HI,x
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tya
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sta P8ESTACK_LO,x
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dex
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rts
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.pend
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push_float .proc
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; ---- push mflpt5 in A/Y onto stack
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; (taking 3 stack positions = 6 bytes of which 1 is padding)
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldy #0
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lda (P8ZP_SCRATCH_W1),y
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sta P8ESTACK_LO,x
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ESTACK_HI,x
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dex
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ESTACK_LO,x
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ESTACK_HI,x
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dex
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iny
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lda (P8ZP_SCRATCH_W1),y
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sta P8ESTACK_LO,x
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dex
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rts
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.pend
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pop_float .proc
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; ---- pops mflpt5 from stack to memory A/Y
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; (frees 3 stack positions = 6 bytes of which 1 is padding)
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldy #4
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inx
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lda P8ESTACK_LO,x
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sta (P8ZP_SCRATCH_W1),y
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dey
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inx
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lda P8ESTACK_HI,x
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sta (P8ZP_SCRATCH_W1),y
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dey
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lda P8ESTACK_LO,x
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sta (P8ZP_SCRATCH_W1),y
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dey
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inx
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lda P8ESTACK_HI,x
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sta (P8ZP_SCRATCH_W1),y
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dey
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lda P8ESTACK_LO,x
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sta (P8ZP_SCRATCH_W1),y
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rts
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.pend
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pop_float_fac1 .proc
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; -- pops float from stack into FAC1
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr pop_float
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lda #<fmath_float1
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ldy #>fmath_float1
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jmp MOVFM
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.pend
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copy_float .proc
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; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
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; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
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sta _target+1
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sty _target+2
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ldy #4
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_loop lda (P8ZP_SCRATCH_W1),y
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_target sta $ffff,y ; modified
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dey
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bpl _loop
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rts
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.pend
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inc_var_f .proc
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; -- add 1 to float pointed to by A/Y
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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stx P8ZP_SCRATCH_REG
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jsr MOVFM
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lda #<FL_ONE_const
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ldy #>FL_ONE_const
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jsr FADD
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ldx P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr MOVMF
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ldx P8ZP_SCRATCH_REG
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rts
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.pend
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dec_var_f .proc
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; -- subtract 1 from float pointed to by A/Y
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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stx P8ZP_SCRATCH_REG
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lda #<FL_ONE_const
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ldy #>FL_ONE_const
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jsr MOVFM
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lda P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr FSUB
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ldx P8ZP_SCRATCH_W1
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ldy P8ZP_SCRATCH_W1+1
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jsr MOVMF
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ldx P8ZP_SCRATCH_REG
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rts
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.pend
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pop_2_floats_f2_in_fac1 .proc
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; -- pop 2 floats from stack, load the second one in FAC1 as well
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lda #<fmath_float2
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ldy #>fmath_float2
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jsr pop_float
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr pop_float
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lda #<fmath_float2
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ldy #>fmath_float2
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jmp MOVFM
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.pend
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fmath_float1 .byte 0,0,0,0,0 ; storage for a mflpt5 value
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fmath_float2 .byte 0,0,0,0,0 ; storage for a mflpt5 value
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push_fac1 .proc
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; -- push the float in FAC1 onto the stack
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stx P8ZP_SCRATCH_REG
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_internal ldx #<fmath_float1
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ldy #>fmath_float1
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jsr MOVMF
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lda #<fmath_float1
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ldy #>fmath_float1
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ldx P8ZP_SCRATCH_REG
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jmp push_float
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.pend
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pow_f .proc
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; -- push f1 ** f2 on stack
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lda #<fmath_float2
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ldy #>fmath_float2
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jsr pop_float
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr pop_float
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stx P8ZP_SCRATCH_REG
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr CONUPK ; fac2 = float1
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lda #<fmath_float2
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ldy #>fmath_float2
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jsr FPWR
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jmp push_fac1._internal
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.pend
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div_f .proc
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; -- push f1/f2 on stack
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jsr pop_2_floats_f2_in_fac1
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stx P8ZP_SCRATCH_REG
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr FDIV
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jmp push_fac1._internal
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.pend
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add_f .proc
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; -- push f1+f2 on stack
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jsr pop_2_floats_f2_in_fac1
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stx P8ZP_SCRATCH_REG
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr FADD
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jmp push_fac1._internal
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.pend
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sub_f .proc
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; -- push f1-f2 on stack
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jsr pop_2_floats_f2_in_fac1
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stx P8ZP_SCRATCH_REG
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr FSUB
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jmp push_fac1._internal
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.pend
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mul_f .proc
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; -- push f1*f2 on stack
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jsr pop_2_floats_f2_in_fac1
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stx P8ZP_SCRATCH_REG
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lda #<fmath_float1
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ldy #>fmath_float1
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jsr FMULT
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jmp push_fac1._internal
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.pend
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neg_f .proc
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; -- toggle the sign bit on the stack
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lda P8ESTACK_HI+3,x
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eor #$80
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sta P8ESTACK_HI+3,x
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rts
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.pend
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var_fac1_less_f .proc
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; -- is the float in FAC1 < the variable AY?
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stx P8ZP_SCRATCH_REG
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jsr FCOMP
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ldx P8ZP_SCRATCH_REG
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cmp #255
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_lesseq_f .proc
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; -- is the float in FAC1 <= the variable AY?
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stx P8ZP_SCRATCH_REG
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jsr FCOMP
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ldx P8ZP_SCRATCH_REG
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cmp #0
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beq +
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cmp #255
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_greater_f .proc
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; -- is the float in FAC1 > the variable AY?
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stx P8ZP_SCRATCH_REG
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jsr FCOMP
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ldx P8ZP_SCRATCH_REG
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cmp #1
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_greatereq_f .proc
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; -- is the float in FAC1 >= the variable AY?
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stx P8ZP_SCRATCH_REG
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jsr FCOMP
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ldx P8ZP_SCRATCH_REG
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cmp #0
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beq +
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cmp #1
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beq +
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lda #0
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rts
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+ lda #1
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rts
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.pend
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var_fac1_notequal_f .proc
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; -- are the floats numbers in FAC1 and the variable AY *not* identical?
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stx P8ZP_SCRATCH_REG
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jsr FCOMP
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ldx P8ZP_SCRATCH_REG
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and #1
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rts
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.pend
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vars_equal_f .proc
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; -- are the mflpt5 numbers in P8ZP_SCRATCH_W1 and AY identical?
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sta P8ZP_SCRATCH_W2
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sty P8ZP_SCRATCH_W2+1
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ldy #0
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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iny
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lda (P8ZP_SCRATCH_W1),y
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cmp (P8ZP_SCRATCH_W2),y
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bne _false
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lda #1
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rts
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_false lda #0
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rts
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.pend
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equal_f .proc
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; -- are the two mflpt5 numbers on the stack identical?
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inx
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inx
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inx
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inx
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lda P8ESTACK_LO-3,x
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cmp P8ESTACK_LO,x
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bne _equals_false
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lda P8ESTACK_LO-2,x
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cmp P8ESTACK_LO+1,x
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bne _equals_false
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lda P8ESTACK_LO-1,x
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cmp P8ESTACK_LO+2,x
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bne _equals_false
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lda P8ESTACK_HI-2,x
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cmp P8ESTACK_HI+1,x
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bne _equals_false
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lda P8ESTACK_HI-1,x
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cmp P8ESTACK_HI+2,x
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bne _equals_false
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_equals_true lda #1
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_equals_store inx
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sta P8ESTACK_LO+1,x
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rts
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_equals_false lda #0
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beq _equals_store
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.pend
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notequal_f .proc
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; -- are the two mflpt5 numbers on the stack different?
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jsr equal_f
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eor #1 ; invert the result
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sta P8ESTACK_LO+1,x
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rts
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.pend
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vars_less_f .proc
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; -- is float in AY < float in P8ZP_SCRATCH_W2 ?
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jsr MOVFM
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lda P8ZP_SCRATCH_W2
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|
ldy P8ZP_SCRATCH_W2+1
|
|
stx P8ZP_SCRATCH_REG
|
|
jsr FCOMP
|
|
ldx P8ZP_SCRATCH_REG
|
|
cmp #255
|
|
bne +
|
|
lda #1
|
|
rts
|
|
+ lda #0
|
|
rts
|
|
.pend
|
|
|
|
vars_lesseq_f .proc
|
|
; -- is float in AY <= float in P8ZP_SCRATCH_W2 ?
|
|
jsr MOVFM
|
|
lda P8ZP_SCRATCH_W2
|
|
ldy P8ZP_SCRATCH_W2+1
|
|
stx P8ZP_SCRATCH_REG
|
|
jsr FCOMP
|
|
ldx P8ZP_SCRATCH_REG
|
|
cmp #255
|
|
bne +
|
|
- lda #1
|
|
rts
|
|
+ cmp #0
|
|
beq -
|
|
lda #0
|
|
rts
|
|
.pend
|
|
|
|
less_f .proc
|
|
; -- is f1 < f2?
|
|
jsr compare_floats
|
|
cmp #255
|
|
beq compare_floats._return_true
|
|
bne compare_floats._return_false
|
|
.pend
|
|
|
|
|
|
lesseq_f .proc
|
|
; -- is f1 <= f2?
|
|
jsr compare_floats
|
|
cmp #255
|
|
beq compare_floats._return_true
|
|
cmp #0
|
|
beq compare_floats._return_true
|
|
bne compare_floats._return_false
|
|
.pend
|
|
|
|
greater_f .proc
|
|
; -- is f1 > f2?
|
|
jsr compare_floats
|
|
cmp #1
|
|
beq compare_floats._return_true
|
|
bne compare_floats._return_false
|
|
.pend
|
|
|
|
greatereq_f .proc
|
|
; -- is f1 >= f2?
|
|
jsr compare_floats
|
|
cmp #1
|
|
beq compare_floats._return_true
|
|
cmp #0
|
|
beq compare_floats._return_true
|
|
bne compare_floats._return_false
|
|
.pend
|
|
|
|
compare_floats .proc
|
|
lda #<fmath_float2
|
|
ldy #>fmath_float2
|
|
jsr pop_float
|
|
lda #<fmath_float1
|
|
ldy #>fmath_float1
|
|
jsr pop_float
|
|
lda #<fmath_float1
|
|
ldy #>fmath_float1
|
|
jsr MOVFM ; fac1 = flt1
|
|
lda #<fmath_float2
|
|
ldy #>fmath_float2
|
|
stx P8ZP_SCRATCH_REG
|
|
jsr FCOMP ; A = flt1 compared with flt2 (0=equal, 1=flt1>flt2, 255=flt1<flt2)
|
|
ldx P8ZP_SCRATCH_REG
|
|
rts
|
|
_return_false lda #0
|
|
_return_result sta P8ESTACK_LO,x
|
|
dex
|
|
rts
|
|
_return_true lda #1
|
|
bne _return_result
|
|
.pend
|
|
|
|
set_array_float_from_fac1 .proc
|
|
; -- set the float in FAC1 in the array (index in A, array in P8ZP_SCRATCH_W1)
|
|
sta P8ZP_SCRATCH_B1
|
|
asl a
|
|
asl a
|
|
clc
|
|
adc P8ZP_SCRATCH_B1
|
|
ldy P8ZP_SCRATCH_W1+1
|
|
clc
|
|
adc P8ZP_SCRATCH_W1
|
|
bcc +
|
|
iny
|
|
+ stx floats_store_reg
|
|
tax
|
|
jsr MOVMF
|
|
ldx floats_store_reg
|
|
rts
|
|
.pend
|
|
|
|
|
|
set_0_array_float .proc
|
|
; -- set a float in an array to zero (index in A, array in P8ZP_SCRATCH_W1)
|
|
sta P8ZP_SCRATCH_B1
|
|
asl a
|
|
asl a
|
|
clc
|
|
adc P8ZP_SCRATCH_B1
|
|
tay
|
|
lda #0
|
|
sta (P8ZP_SCRATCH_W1),y
|
|
iny
|
|
sta (P8ZP_SCRATCH_W1),y
|
|
iny
|
|
sta (P8ZP_SCRATCH_W1),y
|
|
iny
|
|
sta (P8ZP_SCRATCH_W1),y
|
|
iny
|
|
sta (P8ZP_SCRATCH_W1),y
|
|
rts
|
|
.pend
|
|
|
|
|
|
set_array_float .proc
|
|
; -- set a float in an array to a value (index in A, float in P8ZP_SCRATCH_W1, array in P8ZP_SCRATCH_W2)
|
|
sta P8ZP_SCRATCH_B1
|
|
asl a
|
|
asl a
|
|
clc
|
|
adc P8ZP_SCRATCH_B1
|
|
adc P8ZP_SCRATCH_W2
|
|
ldy P8ZP_SCRATCH_W2+1
|
|
bcc +
|
|
iny
|
|
+ jmp copy_float
|
|
; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
|
|
; into the 5 bytes pointed to by A/Y. Clobbers A,Y.
|
|
.pend
|
|
|
|
|