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cc68-00.rules
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# This is fairly ineffective, we need a proper optimizer that can do
# things like live value and constant tracking to make a real dent
# in the 6800 output
#
#
# Patterns for tidying up branching and the like
#
# Trim jumps to next instruction
jmp %1
%1:
=
%1:
jmp %2
%1:
%2:
=
%1:
%2:
jmp %3
%1:
%2:
%3:
=
%1:
%2:
%3:
# And terminal jsr rts
jsr %1
rts
=
jmp %1
#
# Terminal load
#
ldaa %1
ldab %2
;invalid XDP
=
;invalid XDP
clra
ldab %1
;invalid XDP
=
;invalid XDP
clra
clrb
;invalid XDP
=
;invalid XDP
ldaa %1
tab
;invalid XDP
=
;invalid XDP
ldaa %1
ldab %2
;invalid DP
=
;invalid DP
clra
ldab %1
;invalid DP
=
;invalid DP
clra
clrb
;invalid DP
=
;invalid DP
ldaa %1
tab
;invalid DP
=
;invalid DP
# Shorten some other calls with helper variants
# bnega only inspects b and changes a and b
clra
ldab %1
jsr bnega
=
ldab %1
jsr bnega
# Unneeded reloads (NOTWORKING)
staa %1
stab %2
;invalid DP
ldaa %1
ldab %2
=
staa %1
stab %2
;invalid DP
staa %1
stab %2
;invalid XDP
ldaa %1
ldab %2
=
staa %1
stab %2
;invalid XDP
# Silly logic removals
clra
ldab #1
staa @tmp1
orab @tmp1
jne %1
=
clra
ldab #1
jmp %1
# Some trivial optimizations for clra/clrb cases
clra
ldab #$01
stab %1
clra
clrb
=
clra
ldab #1
stab %1
clrb
clra
clrb
stab %1
clra
clrb
=
clra
clrb
stab %1
clra
ldab #$01
staa %1
stab %1+1
clra
clrb
=
clra
ldab #$01
staa %1
stab %1+1
clrb
clra
clrb
staa %1
stab %2
clra
clrb
=
clra
clrb
staa %1
stab %2
# And with D,P
clra
clrb
stab %1
;invalid DP
clra
clrb
=
clra
clrb
stab %1
;invalid DP
clra
ldab #$01
staa %1
stab %2
;invalid DP
clra
clrb
=
clra
ldab #$01
staa %1
stab %2
;invalid DP
clrb
clra
clrb
staa %1
stab %2
;invalid DP
clra
clrb
=
clra
clrb
staa %1
stab %2
;invalid DP
# And with X,D,P
clra
clrb
stab %1
;invalid XDP
clra
clrb
=
clra
clrb
stab %1
;invalid XDP
clra
ldab #$01
staa %1
stab %2
;invalid XDP
clra
clrb
=
clra
ldab #$01
staa %1
stab %2
;invalid XDP
clrb
clra
clrb
staa %1
stab %1
;invalid XDP
clra
clrb
=
clra
clrb
sta %1
stb %1
;invalid XDP
clra
clra
=
clra
clrb
pshb
;invalid DP
clrb
pshb
=
clrb
pshb
pshb
;invalid DP
clra
pshb
;invalid DP
clra
=
clra
pshb
;invalid DP
clra
clrb
staa %1
stab %2
;invalid DP
clra
clrb
=
clra
clrb
staa %1
stab %2
;invalid DP
clra
clrb
staa %1
stab %2
;invalid XDP
clra
clrb
=
clra
clrb
staa %1
stab %2
;invalid XDP
# Similar idea for constants
ldab #%1
pshb
;invalid DP
ldab #%1
=
ldab #%1
pshb
;invalid DP
# Where logic tells us clr is not needed
suba %1
sbcb %2
jne %2
clra
=
suba %1
sbcb %2
jne %2
# Useful overlaps to spot
clrb
pshb
ldab #$FF
=
clrb
pshb
decb
# Store and reload
staa %1
stab %2
ldaa %1
ldab %2
=
staa %1
stab %2
stx %1
ldx %1
=
stx %1
staa %1
stab %2
;invalid DP
ldaa %1
ldab %2
=
staa %1
stab %2
staa %1
stab %2
;invalid XDP
ldaa %1
ldab %2
=
staa %1
stab %2
# Pointless stack
pshb
pulb
=
;
pshb
psha
pula
pulb
=
;
pula
pulb
pshb
psha
ldaa %1
ldab %2
=
ldaa %1
ldab %2
pula
pulb
pshb
psha
clra
ldab %1
=
clra
ldab %1
pula
pulb
pshb
psha
clra
clrb
=
clra
clrb
# Silly reloads (safe as we don't load X)
staa %1
stab %2
ldaa %1
ldab %2
=
staa %1
stab %2
# Branches
#
%1:
jmp %2
%3:
jmp %1
=
%1:
%3:
jmp %2
# Review more conditions
jne %1
jmp %2
%1:
=
jeq %2
%1:
jeq %1
jmp %2
%1:
=
jne %2
%1:
jcc %1
jmp %2
%1:
=
jcs %2
%1:
jcs %1
jmp %2
%1:
=
jcc %2
%1:
# Clean up trailing references from things like p++;
ldaa %1
ldab %2
L%3
ldaa %4
ldab %5
=
L%3
ldaa %4
ldab %5
ldaa %1
ldab %2
ldaa %3
ldab %4
=
ldaa %3
ldab %4
# n++/n-- with unused result
ldaa %1
ldab %1+1
pshb
psha
addb #%2
adca #%3
staa %1
stab %1+1
pula
pulb
ldaa %4
ldab %5
=
ldaa %1
ldab %1+1
addb #%2
adca #%3
staa %1
stab %1+1
ldaa %4
ldab %5
# Clean up tsx tsx
tsx
tsx
=
tsx
# We have a more general issue of cases where we shouldn't go via the
# stack at all to address - eg 16bit compare with static. Until we fix
# the compiler address them here
ldaa %1
ldab %2
pshb
psha
ldaa %3
ldab %4
tsx
subb $01,x
sbca $00,x
pulx
=
ldaa %3
ldab %4
subb %2
sbca %1
ldaa %1
ldab %2
pshb
psha
ldaa %3
ldab %4
tsx
adcb $01,x
adda $00,x
inx
inx
=
ldaa %1
ldab %2
adcb %4
adda %3
ldaa %1
ldab %2
pshb
psha
ldaa %3
ldab %4
subb $01,x
sbca $00,x
inx
inx
=
ldaa %3
ldab %4
subb %2
sbca %1
ldaa %1
ldab %1+1
pshb
psha
ldaa %3
ldab %4
addb $01,x
adca $00,x
inx
inx
=
ldaa %1
ldab %2
addb %4
adca %3
# Repeat clears for 8bit work
clra
ldab %1
clra
=
clra
ldab %1
clra
clrb
stab %1
tsx
ldaa %2
ldab %3
=
clr %1
tsx
ldaa %2
ldab %3
clra
clrb
stab %1
ldaa %2
ldab %3
=
clr %1
ldaa %2
ldab %3
clra
clrb
stab %1
ldaa %2
ldab %3
=
clr %1
ldaa %2
ldab %3
# Byte increments
clra
ldab #$01
addb %1
stab %1
=
inc %1
ldab %1
clra
# Subtract clean up
ldaa %1
ldab %2
pshb
psha
ldaa %3
ldab %4
tsx
subb $01,x
sbca $00,x
ins
ins
=
ldaa %3
ldab %4
suba %2
sbca %1
clra
ldab %2
pshb
psha
ldaa %3
ldab %4
tsx
subb $01,x
sbca $00,x
ins
ins
=
ldaa %3
ldab %4
suba %2
sbca #0
ldaa %1
ldab %2
pshb
psha
clra
ldab %4
tsx
subb $01,x
sbca $00,x
ins
ins
=
clra
ldab %4
suba %2
sbca %1
# Optimize common dtox patterns
ldaa %1,x
ldab %1+1,x
jsr dtox
=
ldx %1,x
ldaa #>%1
ldab #<%1
jsr dtox
=
ldx #%1
ldaa _%1
ldab _%1+1
jsr dtox
=
ldx _%1
# Struct offset maths assign 0
clr @%1
clr @%1+1
pula
pulb
addb #%2
adca #%3
jsr dtox
ldaa @%1
ldab @%1+1
staa %4,x
stab %4+1,x
;invalid DP
=
pula
pulb
addb #%2
adca #%3
jsr dtox
clr %4,x
clr %4+1,x
;invalid DP
jsr dtox
ldaa @tmp2
ldab @tmp2+1
staa $01,x
stab $00,x
=
jsr dtoxstoretmp2
jsr dtox
ldaa @tmp2
ldab @tmp2+1
stab $00,x
=
jsr dtoxstoretmp2b
jsr dtox
clra
ldab $00,x
=
jsr dtoxldb
jsr dtox
ldaa $01,x
ldab $00,x
=
jsr dtoxldw
jsr dtox
clra
=
jsr dtoxclra
staa @tmp
stab @tmp+1
ldx @tmp
=
jsr dtox
tsx
ldx $00,x
ins
ins
=
jsr dopulx
jsr dopulx
stab $00,x
=
jsr dopulxstb
jsr dopulx
stab $01,x
staa $00,x
=
jsr dopulxstd
#
# We also sometimes push d, clear tmp2 and pop
#
pshb
psha
clra
clrb
staa @tmp2
stab @tmp2+1
pula
pulb
=
clr @tmp2
clr @tmp2+1
#
# Clean up store via tmp2 when we have smaller values
#
pshb
psha
clra
clrb
staa @tmp2
stab @tmp2+1
pula
pulb
=
clr @tmp2
clr @tmp2+1
pshb
psha
clra
ldab %1
staa @tmp2
stab @tmp2+1
pula
pulb
=
pshb
ldab %1
clr @tmp2
stab @tmp2+1
pulb
# take the return value store it and push it foo(bar(...
tsx
stab $01,x
staa $00,x
;invalid DP
ldaa $01,x
ldab $00,x
pshb
psha
=
tsx
jsr storedpush
# Subtract cleanup
#
ldaa _%1
ldab _%2
tsx
staa @tmp
stab @tmp+1
ldaa $00,x
ldab $00+1,x
ins
ins
subb @tmp
sbca @tmp+1
=
subb _%2
sbca _%1
ldaa #%1
ldab #%2
tsx
staa @tmp
stab @tmp+1
ldaa $00,x
ldab $00+1,x
ins
ins
subb @tmp
sbca @tmp+1
=
subb #%2
sbca #%1
#
# 8bit post increment (not matching ? FIXME)
#
ldab %1,x
stab @tmp1
incb
stab %1,x
ldab @tmp1
=
ldab %1
inc %1,x
ldab _%1
stab @tmp1
incb
stab _%1
ldab @tmp1
=
ldab _%1
inc _%1
#
# Constant stores to static
# The rare case we can go via X usefully
#
clra
clrb
staa _%1
stab _%1+1
;invalid XDP
=
clr _%1
clr _%1+1
clra
clrb
staa _%1
stab _%1+1
;invalid DP
=
clr _%1
clr _%1+1
#
# See if we can load via X. There are very few cases we can do this
# on the 6800 but they are worth looking for
#
clra
ldab #$%1
staa _%2
stab _%2+1
;invalid XDP
=
ldx #$%1
stx _%2
;invalid XDP
clra
ldab #%1
staa @%2
stab @%2+1
;invalid XDP
=
ldx #%1
stx @%2
;invalid XDP
ldaa #$%1
ldab #$%2
staa _%3
stab _%3+1
;invalid XDP
=
ldx #$%1%2
stx _%3
;invalid XDP
ldaa #$%1
ldab #$%2
staa @%3
stab @%3+1
;invalid XDP
=
ldx #$%1%2
stx @%3
;invalid XDP
# Clean up any stray tsx where we removed the code entirely or added
# one
tsx
;invalid XDP
=
;invalid XDP
############################################################################
#
# Below this point are rules that want to deal with DP only so we
# strip the X out of remaining markers. This is a good rule to comment
# out when debugging rulesets!
#
############################################################################
;invalid XDP
=
;invalid DP
# 16bit post increment
ldaa %1,x
ldab %1+1,x
staa @tmp
stab @tmp+1
addb #%2
adca #%3
staa %1,x
stab %1+1,x
ldaa @tmp
ldab @tmp+1
;invalid DP
=
ldaa %1,x
ldab %1+1,x
addb #%2
adca #%3
staa %1,x
stab %1+1,x