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fix return sequence

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logic error of swapping messages too soon
simplify by folding message unto itself
thus only need one extra register for the address
This commit is contained in:
Torsten Ruger 2018-03-23 18:58:42 +02:00
parent a306c464b7
commit 6721153456
1 changed files with 5 additions and 7 deletions
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12
lib/mom/instruction/return_sequence.rb
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@ -20,17 +20,15 @@ module Mom
#
class ReturnSequence < Instruction
def to_risc(compiler)
return_move = SlotLoad.new( [:message ,:return_value] , [:message , :next_message, :return_value],self)
return_move = SlotLoad.new( [:message ,:return_value] , [:message , :caller, :return_value],self)
moves = return_move.to_risc(compiler)
caller_reg = compiler.use_reg(:int)
return_reg = compiler.use_reg(:int)
return_address = compiler.use_reg(:int)
compiler.reset_regs
caller_index = Risc.resolve_to_index(:message , :caller)
return_index = Risc.resolve_to_index(:message , :return_address)
moves << Risc::SlotToReg.new(self, Risc.message_reg , caller_index , caller_reg)
moves << Risc::Transfer.new(self, caller_reg , Risc.message_reg)
moves << Risc::SlotToReg.new(self, Risc.message_reg, return_index , return_reg)
moves << Risc::FunctionReturn.new(self, return_reg)
moves << Risc::SlotToReg.new(self, Risc.message_reg, return_index , return_address)
moves << Risc::SlotToReg.new(self, Risc.message_reg , caller_index , Risc.message_reg)
moves << Risc::FunctionReturn.new(self, return_address)
end
end