text stringlengths 1 93.6k |
|---|
if self.final_offset:
|
self.riscv_instructions.append(
|
f'addi {sp}, {sp}, {self.final_offset} # writeback'
|
)
|
class Return(Arm64Instruction):
|
"""Convert Return - trivial conversion
|
"""
|
opcodes = ['ret']
|
def __init__(self, opcode, operands):
|
super().__init__(opcode, operands)
|
self.riscv_instructions = ['ret']
|
class MultiplyDivide (Arm64Instruction):
|
"""Combining multiply and divide since should be the same
|
converting mul, udiv or sdiv: simple 1:1
|
"""
|
opcodes = ['mul', 'udiv', 'sdiv']
|
map_op = {
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'mul': 'mul',
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'udiv': 'divu',
|
'sdiv': 'div',
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}
|
# TODO: check type safety!
|
def emit_riscv(self):
|
op = self.map_op[self.opcode]
|
xd, xa, xb = self.specific_regs
|
self.riscv_instructions = [
|
f'{op}{self.wflag} {xd}, {xa}, {xb}'
|
]
|
class Negate(Arm64Instruction):
|
""" Converts negate
|
TODO: Do we need a word level op?
|
"""
|
opcodes = ['neg']
|
def emit_riscv(self):
|
dest, source = self.specific_regs
|
self.riscv_instructions = [
|
f'sub {dest}, x0, {source}'
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]
|
class Subtract(Arm64Instruction):
|
"""Handle Subtract
|
Along with updating flags if it's `subs`
|
If possible, switches a sub with immediate to addi with flipped sign.
|
"""
|
opcodes = ['sub', 'subs']
|
def __init__(self, opcode, operands):
|
super().__init__(opcode, operands)
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self.op = 'sub'
|
if self.is_safe_imm(self.operands[2]):
|
self.op = 'addi'
|
self.immediate_value = -self.operands[2]['immediate']
|
self.op += self.wflag
|
if self.opcode == 'subs':
|
self.specific_regs.append(COMPARE)
|
def emit_riscv(self):
|
super().emit_riscv()
|
dest, s1, s2 = self.get_args()
|
if self.immediate_value:
|
s2 = self.immediate_value
|
self.riscv_instructions += [
|
f'{self.op} {dest}, {s1}, {s2}'
|
]
|
if self.opcode == 'subs':
|
cond = self.specific_regs[-1]
|
self.riscv_instructions.append(
|
f'mv {cond}, {dest} # simulating updating flags'
|
)
|
class Branch(Arm64Instruction):
|
""" Branch is jump, nothing else to it """
|
opcodes = ['b']
|
def __init__(self, opcode, operands):
|
super().__init__(opcode, operands)
|
target = operands[0]['label']
|
self.riscv_instructions = [
|
f'j {target}'
|
]
|
class Shifts(Arm64Instruction):
|
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