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avra: a litte bit of code deduplication

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This commit is contained in:
Virgil Dupras 2019-12-15 18:34:14 -05:00
parent 2652c81519
commit e9c692ed50
1 changed files with 13 additions and 24 deletions
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37
apps/zasm/avr.asm
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@ -36,6 +36,8 @@ instrNames:
.db "ADC", 0
.db "ADD", 0
.db "AND", 0
.db "BLD", 0
.db "BST", 0
.db "CLR", 0
.db "CP", 0
.db "CPC", 0
@ -45,8 +47,10 @@ instrNames:
.db "MUL", 0
.db "OR", 0
.db "SBC", 0
.db "SBRC", 0
.db "SBRS", 0
.db "SUB", 0
.equ I_ANDI 31
.equ I_ANDI 35
.db "ANDI", 0
.db "CPI", 0
.db "LDI", 0
@ -54,11 +58,6 @@ instrNames:
.db "SBCI", 0
.db "SBR", 0
.db "SUBI", 0
.equ I_BLD 38
.db "BLD", 0
.db "BST", 0
.db "SBRC", 0
.db "SBRS", 0
.equ I_RCALL 42
.db "RCALL", 0
.db "RJMP", 0
@ -134,10 +133,12 @@ instrNames:
; In the same order as in instrNames
instrTbl:
; Rd(5) + Rd(5): XXXXXXrd ddddrrrr
; Rd(5) + Rd(5) (0x02) and Rd(5) + bit (0x05) (same processing)
.db 0x02, 0b00011100, 0x00 ; ADC
.db 0x02, 0b00001100, 0x00 ; ADD
.db 0x02, 0b00100000, 0x00 ; AND
.db 0x05, 0b11111000, 0x00 ; BLD
.db 0x05, 0b11111010, 0x00 ; BST
.db 0x41, 0b00100100, 0x00 ; CLR (Rr copies Rd)
.db 0x02, 0b00010100, 0x00 ; CP
.db 0x02, 0b00000100, 0x00 ; CPC
@ -147,6 +148,8 @@ instrTbl:
.db 0x02, 0b10011100, 0x00 ; MUL
.db 0x02, 0b00101000, 0x00 ; OR
.db 0x02, 0b00001000, 0x00 ; SBC
.db 0x05, 0b11111100, 0x00 ; SBRC
.db 0x05, 0b11111110, 0x00 ; SBRS
.db 0x02, 0b00011000, 0x00 ; SUB
; Rd(4) + K(8): XXXXKKKK ddddKKKK
.db 0x04, 0b01110000, 0x00 ; ANDI
@ -156,12 +159,6 @@ instrTbl:
.db 0x04, 0b01000000, 0x00 ; SBCI
.db 0x04, 0b01100000, 0x00 ; SBR
.db 0x04, 0b01010000, 0x00 ; SUBI
; Rd(5) + bit: XXXXXXXd ddddXbbb: lonely bit in LSB is 0 in all cases, so we
; ignore it.
.db 0x05, 0b11111000, 0x00 ; BLD
.db 0x05, 0b11111010, 0x00 ; BST
.db 0x05, 0b11111100, 0x00 ; SBRC
.db 0x05, 0b11111110, 0x00 ; SBRS
; k(12): XXXXkkkk kkkkkkkk
.db 0x00, 0b11010000, 0x00 ; RCALL
.db 0x00, 0b11000000, 0x00 ; RJMP
@ -298,10 +295,8 @@ parseInstruction:
ld a, e ; InstrID
cp I_ANDI
jr c, .spitRd5Rr5
cp I_BLD
jr c, .spitRdK8
cp I_RCALL
jr c, .spitRdBit
jr c, .spitRdK8
cp I_IN
jr c, .spitK12
cp I_BREAK
@ -313,6 +308,8 @@ parseInstruction:
call .placeRd
jp .spit
.spitRd5Rr5:
; This is used for both Rd(5) + Rr(5) and Rd(5) + bit because the same
; logic works for both cases.
ld a, h
call .placeRd
ld a, l
@ -345,14 +342,6 @@ parseInstruction:
ld b, a
jp .spitMSB
.spitRdBit:
ld a, h
call .placeRd
or l
; LSB is in A and is ready to go
call ioPutB
jr .spitMSB
.spitK12:
; Let's deal with the upcode constant before we destroy IX below
ld b, (ix+1)