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Make compilation tests pass.

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This commit is contained in:
Chris Pressey 2018-03-14 16:27:33 +00:00
parent adb53f7a04
commit 96fbe03ce7
2 changed files with 17 additions and 1 deletions
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4
src/sixtypical/compiler.py
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@ -556,9 +556,11 @@ class Compiler(object):
if instr.direction > 0:
self.compile_inc(instr, instr.dest)
final = instr.final.succ()
elif instr.direction < 0:
self.compile_dec(instr, instr.dest)
self.compile_cmp(instr, instr.final, instr.dest)
final = instr.final.pred()
self.compile_cmp(instr, final, instr.dest)
self.emitter.emit(BNE(Relative(top_label)))
def compile_with_interrupts_off(self, instr):

14
src/sixtypical/model.py
View File

@ -296,6 +296,20 @@ class ConstantRef(Ref):
def low_byte(self):
return self.value & 255
def pred(self):
assert self.type == TYPE_BYTE
value = self.value - 1
while value < 0:
value += 256
return ConstantRef(self.type, value)
def succ(self):
assert self.type == TYPE_BYTE
value = self.value + 1
while value > 255:
value -= 256
return ConstantRef(self.type, value)
REG_A = LocationRef(TYPE_BYTE, 'a')
REG_X = LocationRef(TYPE_BYTE, 'x')