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cc68.rules
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cc68.rules
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# Trim jumps to next instruction
jmp %1
%1:
=
%1:
# And terminal jsr rts
jsr %1
rts
=
jmp %1
# Indirect function calls can go via x when we are loading the value
# from a target just before the branch
ldd %1
xgdx
jsr ,x
=
ldx %1
jsr ,x
# Double exchanges
xgdx; XtoD
xgdx; DtoX
=
;
# Double exchanges
xgdx
xgdx
=
;
# Double push of constant
# We could also do static but we have no visibility into volatiles yet
ldx #%1
pshx
ldx #%1
=
ldx #%1
pshx
ldx @%1
pshx
ldx @%1
=
ldx @%1
pshx
# int foo = something; func(foo, ....)
pshx
;invalid XDP
tsx
ldx $01,x
pshx
=
pshx
pshx
# Silly logic removals
ldd @one
staa @tmp1
orab @tmp1
jne %1
=
ldd @one
jne %1
# Some trivial optimizations for clra/clrb cases
ldd @one
stab %1
clra
clrb
=
ldd @one
stab %1
decb
clra
clrb
stab %1
clra
clrb
=
clra
clrb
stab %1
ldd @one
std %1
clra
clrb
=
ldd @one
std %1
decb
clra
clrb
std %1
clra
clrb
=
clra
clrb
std %1
# And with D,P
clra
clrb
stab %1
;invalid DP
clra
clrb
=
clra
clrb
stab %1
;invalid DP
ldd @one
std %1
;invalid DP
clra
clrb
=
ldd @one
std %1
decb
;invalid DP
clra
clrb
std %1
;invalid DP
clra
clrb
=
clra
clrb
std %1
;invalid DP
# And with X,D,P
clra
clrb
stab %1
;invalid XDP
clra
clrb
=
clra
clrb
stab %1
;invalid XDP
ldd @one
std %1
;invalid XDP
clra
clrb
=
ldd @one
std %1
decb
;invalid XDP
clra
clrb
std %1
;invalid XDP
clra
clrb
=
clra
clrb
std %1
;invalid XDP
clra
clra
=
clra
clrb
pshb
;invalid DP
clrb
pshb
=
clrb
pshb
pshb
;invalid DP
clra
pshb
;invalid DP
clra
=
clra
pshb
;invalid DP
clra
clrb
std %1
;invalid DP
clra
clrb
=
clra
clrb
std %1
;invalid DP
clra
clrb
std %1
;invalid XDP
clra
clrb
=
clra
clrb
std %1
;invalid XDP
# Similar idea for constants
ldab #%1
pshb
;invalid DP
ldab #%1
=
ldab #%1
pshb
;invalid DP
# Where logic tells us clr is not needed
subd %1
jne %2
clra
=
subd %1
jne %2
# Make exchange and push more efficient
xgdx; XtoD
pshb
psha
=
pshx
xgdx; XtoD
xgdx; DtoX
pshb
psha
=
pshx
xgdx; XtoD
# Useful overlaps to spot
clrb
pshb
ldab #$FF
=
clrb
pshb
decb
# Push of postinc/dec static/global
stx _%1
dex
stx @tmp
ldd @tmp
ldd _%1
pshb
psha
;invalid XDP
=
stx _%1
pshx
stx _%1
inx
stx @tmp
ldd @tmp
ldd _%1
pshb
psha
;invalid XDP
=
stx _%1
pshx
# Store and reload
std %1
ldd %1
=
std %1
stx %1
ldx %1
=
stx %1
std %1
;invalid DP
ldd %1
=
std %1
std %1
;invalid XDP
ldd %1
=
std %1
# Some classes of compare
# Simple check on 8bit versus 0 (safe only due to compiler behaviour)
clra
ldab %1
jne %2
L%3
ldd %4
=
ldab %1
jne %2
L%3
ldd %4
clra
ldab %1
jne %2
ldd %3
=
ldab %1
jne %2
# Pointless stack
pshb
pulb
=
;
pshx
pulx
=
;
pshb
psha
pula
pulb
=
;
pula
pulb
pshb
psha
ldd %1
=
ldd %1
pula
pulb
pshb
psha
clra
ldab %1
=
clra
ldab %1
pula
pulb
pshb
psha
clra
clrb
=
clra
clrb
# Turn pula/pulb/xgdx into pulx. This should be safe without a check
# we then load D but might need a hint adding
pula
pulb
xgdx; DtoX
=
pulx
# DP optimized constants
#
clra
ldab #$01
=
ldd @one
addd #$0001
=
addd @one
# 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:
# Fix up some of the X cases
# Push and then invalidate D so can use X
ldd %1
pshb
psha
;invalid XDP
=
ldx %1
pshx
;invalid XDP
# Push and then invalidate D so can use X single arg entry, with label
ldd %1
pshb
psha
%2:
;invalid XDP
=
ldx %1
pshx
%2:
;invalid XDP
# Stack via X
ldd %1
pshb
psha
;invalid XDP
=
ldx %1
pshx
# Stack via X when there is a further argument stacked via X which does
# not use X (either constant or static (# or _)). We cannot do this for
# locals as they will use ,x in the second load and a tsx is no cheaper
# we can't easily do this for all combinations unfortunately because
# we also need to check there are no ,x dependencies further down the chain
# until we hit the jsr _func
#
# TODO: add @zero and @one match forms ditto clra/clrb ones ?
#
# func(arg,const)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
jsr _%3
=
ldx %1
pshx
ldx #%2
pshx
;invalid DP
jsr _%3
# func(arg, static)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
jsr _%3
=
ldx %1
pshx
ldx _%2
pshx
;invalid DP
jsr _%3
# func(arg, const, const)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
ldd #%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx #%2
pshx
ldx #%3
pshx
;invalid DP
jsr _%4
# func(arg, const, static)
ldd %1
pshb
psha
;invalid DP
ldd #%2
pshb
psha
;invalid DP
ldd _%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx #%2
pshx
ldx _%3
pshx
;invalid DP
jsr _%4
# func(arg, static, const)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
ldd #%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx _%2
pshx
ldx #%3
pshx
;invalid DP
jsr _%4
# func(arg, static, static)
ldd %1
pshb
psha
;invalid DP
ldd _%2
pshb
psha
;invalid DP
ldd _%3
pshb
psha
;invalid DP
jsr _%4
=
ldx %1
pshx
ldx _%2
pshx
ldx _%3
pshx
;invalid DP
jsr _%4
# Stack via X when X is live but we are calling a user function so _xyz
ldd %1
pshb
psha
;invalid DP
jsr _%2
=
ldx %1
pshx
;invalid DP
jsr _%2
# Stack via X because we can see a non X dependent X load following
ldd %1
pshb
psha
ldx @%2
=
ldx %1
pshx
ldx @%2
ldd %1
pshb
psha
ldx _%2
=
ldx %1
pshx
ldx _%2
ldd %1
pshb
psha
ldx #%2
=
ldx %1
pshx
ldx #%2
# Clean up trailing references from things like p++;
ldd %1
L%2
ldd %3
=
L%2
ldd %3
ldd %1
ldd %2
=
ldd %2
# n++/n-- with unused result
ldd %1
pshb
psha
addd %2
std %1
pula
pulb
ldd %3
=
ldd %1
addd %2
std %1
ldd %3
# Optimize a few pull sequences where we can see X is not live
pula
pulb
L%1:
tsx
=
pulx
L%1:
tsx
pula
pulb
tsx
=
pulx
tsx
pula
pulb
pulx
=
pulx
pulx
pula
pulb
;invalid XDP
=
pulx
;invalid XDP
ldd %1
pshb
psha
tsx
ldd %2
=
ldx %1
pshx
tsx
ldd %2
# Some useful tricks with comparisons. Where the comparison sets the flags
# and the next thing we do is to do a conditional based on them we can
# eliminate the test function. Look at the others as we clean them up
# in the compiler
jsr booleq
jeq %1
=
jne %1
jsr boolne
jne %1
=
jne %1
# 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
ldd %1
pshb
psha
ldd %2
tsx
subd $00,x
pulx
=
ldd %2
subd %1
ldd %1
pshb
psha
ldd %2
tsx
addd $00,x
pulx
=
ldd %1
addd %2
ldd %1
pshb
psha
ldd %2
subd $00,x
pulx
=
ldd %2
subd %1
ldd %1
pshb
psha
ldd %2
addd $00,x
pulx
=
ldd %1
addd %2
# re-order constant subtract
ldx %1
pshx
ldd #%2
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd #%2
ldx %1
pshx
ldd @one
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd @one
# re-order constant add
ldx %1
pshx
ldd #%2
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd #%2
ldx %1
pshx
ldd @one
tsx
std @tmp
ldd $00,x
pulx
subd @tmp
=
ldd %1
subd @one
# re-order some assignments of constant to computed address
# Can't do this for locals (we need X then)
# Int versions then char versions
ldd %1
pshb
psha
ldd #%2
pulx
std %3
=
ldx %1
ldd #%2
std %3
ldd %1
pshb
psha
ldd @%2
pulx
std %3
=
ldx %1
ldd @%2
std %3
ldd %1
pshb
psha
ldd _%2
pulx
std %3
=
ldx %1
ldd _%2
std %3
ldd %1
pshb
psha
ldd #%2
pulx
stab %3
=
ldx %1
ldd #%2
stab %3
ldd %1
pshb
psha
ldd @%2
pulx
stab %3
=
ldx %1
ldd @%2
stab %3
ldd %1
pshb
psha
ldd _%2
pulx
stab %3
=
ldx %1
ldd _%2
stab %3
# Spot logic operations where we can use x to avoid going over the stack
# We can't handle all cases because if the second op is ,x then we lose
ldd %1
pshb
psha
ldd #%2
tsx
=
ldx %1
pshx
ldd #%2
tsx
ldd %1
pshb
psha
ldd _%2
tsx
=
ldx %1
pshx
ldd _%2
tsx
# Repeat clears for 8bit work
clra
ldab %1
clra
=
clra
ldab %1
clra
clrb
stab %1
tsx
ldd %2
=
clrb
stab %1
tsx
ldd %2
clra
clrb
stab %1
ldd %2
=
clrb
stab %1
ldd %2
clra
clrb
stab %1
ldd %2
=
clrb
stab %1
ldd %2
# Pointer chases that can use X directly
ldd %1
std @tmp
ldx @tmp
ldd %2
=
ldx %1
ldd %2
ldd %1
std @tmp
ldx @tmp
clra
ldab%2
=
ldx %1
clra
ldab %2
ldd %1
pshb
psha
std @tmp