def optimize(self, expr: BinaryOp):
if expr.op == "Add" and len(expr.operands) == 2:
op0, op1 = expr.operands
if isinstance(op0, BinaryOp) and op0.op == "Div" and isinstance(
op0.operands[1], Const):
if isinstance(op1,
BinaryOp) and op1.op == "Div" and isinstance(
op1.operands[1], Const):
if isinstance(op1.operands[0], BinaryOp) and op1.operands[0].op == "Mul" and \
isinstance(op1.operands[0].operands[1], Const):
a0 = op0.operands[0]
a1 = op1.operands[0].operands[0]
if a0.likes(a1):
N0 = op0.operands[1]
N1: int = op1.operands[0].operands[1].value
if N0.value == op1.operands[1].value:
mul = BinaryOp(op0.idx, "Mul", [
a0,
Const(None, None, N1 + 1, expr.bits, **
expr.operands[0].operands[1].tags)
], False, **op0.tags)
div = BinaryOp(expr.idx, "Div", [mul, N0],
False, **expr.tags)
return div
return None
def optimize(self, expr: BinaryOp):
if expr.op == "Shr" and len(expr.operands) == 2 and isinstance(expr.operands[1], Const) \
and isinstance(expr.operands[0], BinaryOp) and expr.operands[0].op == "Div" \
and isinstance(expr.operands[0].operands[1], Const):
inner = expr.operands[0].operands[0]
if isinstance(inner, BinaryOp) and inner.op == "Mul" and isinstance(inner.operands[1], Const):
a = inner.operands[0]
N0 = inner.operands[1].value
N1 = expr.operands[0].operands[1]
N2 = expr.operands[1].value
mul = BinaryOp(inner.idx, "Mul",
[a,
Const(None, None, N0 // (2 ** N2), expr.bits, **expr.operands[0].operands[1].tags)
],
False,
**inner.tags)
div = BinaryOp(expr.idx, "Div",
[mul,
N1],
False,
**expr.tags)
return div
return None
def optimize(self, expr: BinaryOp):
if isinstance(expr.operands[0], Convert):
if (expr.operands[0].to_bits == 32 # converting to an int
and isinstance(expr.operands[1], Const)
):
if expr.op == "And":
if expr.operands[0].from_bits == 16 and expr.operands[1].value <= 0xffff:
con = Const(None, None, expr.operands[1].value, 16, **expr.operands[1].tags)
new_expr = BinaryOp(expr.idx, "And", (expr.operands[0].operand, con), expr.signed,
bits=16, **expr.tags)
return Convert(expr.operands[0].idx, 16, 32, expr.operands[0].is_signed, new_expr,
**expr.operands[0].tags)
elif expr.operands[0].from_bits == 8 and expr.operands[1].value <= 0xff:
con = Const(None, None, expr.operands[1].value, 8, **expr.operands[1].tags)
new_expr = BinaryOp(expr.idx, "And", (expr.operands[0].operand, con), expr.signed,
bits=8, **expr.tags)
return Convert(expr.operands[0].idx, 8, 32, expr.operands[0].is_signed, new_expr,
**expr.operands[0].tags)
elif expr.op in {"CmpEQ", "CmpNE", "CmpGT", "CmpGE", "CmpGTs", "CmpGEs", "CmpLT", "CmpLE", "CmpLTs", "CmpLEs"}:
if expr.operands[0].from_bits == 16 and expr.operands[1].value <= 0xffff:
con = Const(None, None, expr.operands[1].value, 16, **expr.operands[1].tags)
new_expr = BinaryOp(expr.idx, expr.op, (expr.operands[0].operand, con), expr.signed,
bits=16, **expr.tags)
return new_expr
elif expr.operands[0].from_bits == 8 and expr.operands[1].value <= 0xff:
con = Const(None, None, expr.operands[1].value, 8, **expr.operands[1].tags)
new_expr = BinaryOp(expr.idx, expr.op, (expr.operands[0].operand, con), expr.signed,
bits=8, **expr.tags)
return new_expr
elif (isinstance(expr.operands[1], Convert)
and expr.operands[1].to_bits == expr.operands[0].to_bits
and expr.operands[1].from_bits == expr.operands[0].from_bits
):
if expr.op in {"Add", "Sub"}:
op0 = expr.operands[0]
op0_inner = expr.operands[0].operand
# op1 = expr.operands[1]
op1_inner = expr.operands[1].operand
new_expr = BinaryOp(expr.idx, expr.op, (op0_inner, op1_inner), expr.signed,
bits=op0.from_bits, **expr.tags,
)
r = Convert(expr.idx, op0.from_bits, op0.to_bits, op0.is_signed, new_expr,
**op0.tags,
)
return r
return None
def optimize(self, expr: BinaryOp):
# (Conv(M->N, expr) << P) >> Q ==> (Conv(M->N, expr) & bitmask) >> (Q-P), where
# Q >= P, and
# M < N, and
# bitmask = 0b('1' * (N - P))
if expr.op == "Shr" and isinstance(expr.operands[1], Const):
q = expr.operands[1].value
expr_b = expr.operands[0]
if isinstance(expr_b,
BinaryOp) and expr_b.op == "Shl" and isinstance(
expr_b.operands[1], Const):
p = expr_b.operands[1].value
expr_a = expr_b.operands[0]
if q >= p and isinstance(expr_a,
Convert) and not expr_a.is_signed:
m = expr_a.from_bits
n = expr_a.to_bits
if m < n and n >= p:
bitmask = (1 << (n - p)) - 1
and_expr = BinaryOp(
None,
'And',
(
Convert(expr_a.idx, m, n, False,
expr_a.operand, **expr_a.tags),
Const(None, None, bitmask, n),
),
False,
variable=None,
variable_offset=None,
**expr.tags,
)
return BinaryOp(
None,
'Shr',
(
and_expr,
Const(None, None, q - p, and_expr.bits),
),
False,
**expr.tags,
)
return None
def optimize(self, expr: BinaryOp):
if expr.op == "Sub" and len(expr.operands) == 2 \
and isinstance(expr.operands[1], BinaryOp) and expr.operands[1].op == "Div" \
and isinstance(expr.operands[1].operands[1], Const):
a = expr.operands[0]
if expr.operands[1].operands[0].likes(a):
N = expr.operands[1].operands[1].value
mul = BinaryOp(expr.idx, "Mul",
[a, Const(None, None, N - 1, expr.bits)], False,
**expr.tags)
div = BinaryOp(expr.operands[1].idx, "Div", [
mul,
Const(None, None, N, expr.bits, **expr.operands[1].tags)
], False, **expr.operands[1].tags)
return div
return None
def optimize(self, expr: Convert):
# Conv(M->1, ((expr) >> N) & 1) => expr < 0
# Conv(M->1, ((expr - 0) >> N) & 1) => expr < 0
if expr.to_bits == 1:
if isinstance(expr.operand, BinaryOp) and expr.operand.op == "And" \
and isinstance(expr.operand.operands[1], Const) \
and expr.operand.operands[1].value == 1:
# taking a single bit
inner_expr = expr.operand.operands[0]
if isinstance(inner_expr, BinaryOp) and inner_expr.op == "Shr" \
and isinstance(inner_expr.operands[1], Const):
# right-shifting with a constant
shr_amount = inner_expr.operands[1].value
if shr_amount == 7:
# int8_t
to_bits = 8
elif shr_amount == 15:
# int16_t
to_bits = 16
elif shr_amount == 31:
# int32_t
to_bits = 32
elif shr_amount == 63:
# int64_t
to_bits = 64
else:
# unsupported
return None
real_expr = inner_expr.operands[0]
if isinstance(real_expr, BinaryOp) and real_expr.op == "Sub" \
and isinstance(real_expr.operands[1], Const) \
and real_expr.operands[1].value == 0:
real_expr = real_expr.operands[0]
cvt = Convert(expr.idx, real_expr.bits, to_bits, False,
real_expr, **expr.tags)
cmp = BinaryOp(
None,
"CmpLT",
(
cvt,
Const(None, None, 0, to_bits),
),
True,
**expr.tags,
)
return cmp
return None
def _handle_BinaryOp(self, expr_idx: int, expr: BinaryOp, stmt_idx: int, stmt: Statement, block: Block):
new_operands = [ self._handle_expr(0, expr.operands[0], stmt_idx, stmt, block),
self._handle_expr(1, expr.operands[1], stmt_idx, stmt, block),
]
if any(op is not None for op in new_operands):
new_operands = [(new_op if new_op is not None else old_op) for new_op, old_op in zip(new_operands, expr.operands)]
return BinaryOp(expr.idx, expr.op,
new_operands,
expr.signed,
variable=expr.variable,
variable_offset=expr.variable_offset,
**expr.tags
)
return None
def optimize(self, expr: BinaryOp):
if expr.op == "Sub" and len(expr.operands) == 2 \
and isinstance(expr.operands[0], BinaryOp) and expr.operands[0].op == "Shl" \
and isinstance(expr.operands[0].operands[1], Const):
a = expr.operands[1]
if expr.operands[0].operands[0].likes(a):
N = expr.operands[0].operands[1].value
return BinaryOp(expr.idx, "Mul",
[a,
Const(None, None, 2 ** N - 1, expr.bits, **expr.operands[0].operands[1].tags)
],
False,
**expr.tags)
return None
def optimize(self, expr: BinaryOp):
if expr.op == "Sub" and len(expr.operands) == 2 \
and isinstance(expr.operands[1], BinaryOp) and expr.operands[1].op == "Mul" \
and isinstance(expr.operands[1].operands[1], Const):
a0 = expr.operands[0]
op1 = expr.operands[1]
mul_const = expr.operands[1].operands[1]
if isinstance(op1.operands[0], BinaryOp) and op1.operands[0].op == "Div" and \
isinstance(op1.operands[0].operands[1], Const):
a1 = op1.operands[0].operands[0]
div_const = op1.operands[0].operands[1]
if a0.likes(a1) and mul_const.value == div_const.value:
mod = BinaryOp(expr.idx, "DivMod", [a0, div_const], False,
**expr.tags)
return mod
return None
def optimize(self, expr: Convert):
if expr.from_bits == 64 and expr.to_bits == 32 \
and isinstance(expr.operand, BinaryOp) and expr.operand.op == "Shr" \
and isinstance(expr.operand.operands[1], Const) \
and expr.operand.operands[1].value == 32:
inner = expr.operand.operands[0]
if isinstance(inner,
BinaryOp) and inner.op == "Mull" and isinstance(
inner.operands[0], Const):
bits = 32
C = inner.operands[0].value
X = inner.operands[1]
V = bits
ndigits = 5 if V == 32 else 6
divisor = self._check_divisor(pow(2, V), C, ndigits)
if divisor is not None:
new_const = Const(None, None, divisor, V)
new_expr = BinaryOp(inner.idx, 'Div', [X, new_const],
inner.signed, **inner.tags)
return new_expr
def _handle_BinaryOp(self, expr_idx: int, expr: BinaryOp, stmt_idx: int,
stmt: Statement, block: Optional[Block]):
changed = False
operand_0 = self._handle_expr(0, expr.operands[0], stmt_idx, stmt,
block)
if operand_0 is not None and operand_0 is not expr.operands[0]:
changed = True
else:
operand_0 = expr.operands[0]
operand_1 = self._handle_expr(1, expr.operands[1], stmt_idx, stmt,
block)
if operand_1 is not None and operand_1 is not expr.operands[1]:
changed = True
else:
operand_1 = expr.operands[1]
if changed:
new_expr = expr.copy()
new_expr.operands = (operand_0, operand_1)
return new_expr
return None
def optimize(self, expr: BinaryOp):
#
if expr.op == "And" \
and isinstance(expr.operands[1], Const):
mask = expr.operands[1].value
to_bits = _MASK_TO_BITS.get(mask, None)
if to_bits is None:
return None
if isinstance(expr.operands[0], Convert):
conv: Convert = expr.operands[0]
atom = conv.operand
if conv.from_bits <= to_bits:
# this masking is useless
return Convert(None, conv.from_bits, expr.bits,
conv.is_signed, atom, **conv.tags)
elif isinstance(expr.operands[0], BinaryOp) and expr.operands[0].op in {'Shl', 'Shr', 'Sar'} \
and isinstance(expr.operands[0].operands[0], Convert):
binop_expr = expr.operands[0]
conv: Convert = expr.operands[0].operands[0]
atom = conv.operand
if conv.from_bits <= to_bits:
# this masking is useless
# apply the binary operation
atom = BinaryOp(None,
binop_expr.op,
(atom, binop_expr.operands[1]),
binop_expr.signed,
variable=binop_expr.variable,
variable_offset=binop_expr.variable_offset,
**binop_expr.tags)
return Convert(None, conv.from_bits, expr.bits,
conv.is_signed, atom, **conv.tags)
return None