def PhaseFinalizeStackAndLocalRegAlloc(fun: ir.Fun, _opt_stats: Dict[str, int],
fout):
"""Finalizing the stack implies performing all transformations that
could increase register usage.
"""
# print("@@@@@@\n", "\n".join(serialize.FunRenderToAsm(fun)), file=fout)
# hack: some of the code expansion templates need a scratch reg
# we do not want to reserve registers for this globally, so instead
# we inject some nop instructions that reserve a register that we
# use as a scratch for the instruction immediately following the nop
#
# This still has a potential bug: if the next instruction has one of its
# inputs spilled, it will like use the scratch reg provided by the nop1
# which will cause incorrect code.
# TODO: add a checker so we at least detect this
# Alternatives: reserve reg (maybe only for functions that need it)
# TODO: make sure that nop1 regs never get spilled
isel_tab.FunAddNop1ForCodeSel(fun)
regs.FunLocalRegAlloc(fun)
fun.FinalizeStackSlots()
# if fun.name == "fibonacci": DumpFun("after local alloc", fun)
# DumpFun("after local alloc", fun)
# cleanup
_FunMoveEliminationCpu(fun)
def PhaseFinalizeStackAndLocalRegAlloc(fun: ir.Fun, _opt_stats: Dict[str, int],
fout):
"""Finalizing the stack implies performing all transformations that
could increase register usage.
"""
regs.FunLocalRegAlloc(fun)
fun.FinalizeStackSlots()
# cleanup
FunMoveEliminationCpu(fun)
def PhaseFinalizeStackAndLocalRegAlloc(fun: ir.Fun, _opt_stats: Dict[str, int],
fout):
"""Finalizing the stack implies performing all transformations that
could increase register usage.
"""
if False:
to_be_spillled = [reg for reg in fun.regs if not reg.HasCpuReg()]
to_be_spillled.sort()
reg_alloc.FunSpillRegs(fun, o.DK.U32, to_be_spillled)
fun.FinalizeStackSlots()
# DumpFun("@@@ aaa", fun)
# Special flavor out-of-bound immediate rewriter that is stack aware
# In rare cases this could introduce the need for another gpr reg
_FunRewriteOutOfBoundsOffsetsStk(fun)
# DumpFun("@@@@ before reg-alloc", fun)
# Assign regs to local var
regs.FunLocalRegAlloc(fun)
fun.flags &= ~ir.FUN_FLAG.STACK_FINALIZED
fun.FinalizeStackSlots()
# cleanup
FunMoveEliminationCpu(fun)
