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Implement post_decrement

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Paul Mathieu 2021-02-22 20:34:17 -08:00
parent abfd8d3647
commit fbeb22df5a
1 changed files with 16 additions and 0 deletions
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16
tools/cc.py
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@ -386,6 +386,14 @@ class Incr(UnOp):
f'add {self.dest}, {self.operand}, {sc0}',
f'or {self.operand}, {self.dest}, {self.dest}']
class Decr(UnOp):
scratch_need = 1
def synth(self, scratches):
sc0 = scratches[0]
return [f'set {sc0}, 1',
f'sub {self.dest}, {self.operand}, {sc0}',
f'or {self.operand}, {self.dest}, {self.dest}']
class NotOp(UnOp):
def synth(self, scratches):
@ -853,6 +861,14 @@ class CcInterp(lark.visitors.Interpreter):
self.cur_fun.deferred_ops.append(Incr(self.cur_fun, [reg, reg]))
self.cur_fun.deferred_ops.append(Store(self.cur_fun, [reg, var]))
def post_decrement(self, tree):
self.visit_children(tree)
tree.op = Reg(tree.children[0].op.out)
var = tree.children[0].var
reg = tree.op.out
self.cur_fun.deferred_ops.append(Decr(self.cur_fun, [reg, reg]))
self.cur_fun.deferred_ops.append(Store(self.cur_fun, [reg, var]))
pre_increment = _unary_op(Incr)
bool_not = _unary_op(BoolNot)