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comment unused code

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This commit is contained in:
Torsten Ruger 2016-12-14 19:52:08 +02:00
parent 56bf875f36
commit 27e7a362db
1 changed files with 28 additions and 22 deletions
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50
lib/arm/instructions/compare_instruction.rb
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@ -48,28 +48,7 @@ module Arm
operand = arg
immediate = 0
elsif (arg.is_a?(Arm::Shift))
rm_ref = arg.argument
immediate = 0
shift_op = {'lsl' => 0b000, 'lsr' => 0b010, 'asr' => 0b100,
'ror' => 0b110, 'rrx' => 0b110}[arg.type]
if (arg.type == 'ror' and arg.value.nil?)
# ror #0 == rrx
raise "cannot rotate by zero #{arg} #{inspect}"
end
arg1 = arg.value
if (arg1.is_a?(Register::IntegerConstant))
if (arg1.value >= 32)
raise "cannot shift by more than 31 #{arg1} #{inspect}"
end
shift_imm = arg1.value
elsif (arg1.is_a?(Arm::Register))
shift_op val |= 0x1;
shift_imm = arg1.number << 1
elsif (arg.type == 'rrx')
shift_imm = 0
end
operand = rm_ref | (shift_op << 4) | (shift_imm << 4+3)
# handle_shift
else
raise "invalid operand argument #{arg.inspect} , #{inspect}"
end
@ -88,6 +67,33 @@ module Arm
io.write_uint32 val
end
# Arms special shift abilities are not modelled in the register level
# So they would have to be used inoptimisations, that are not implemented
# in short unused code
def handle_shift
# rm_ref = arg.argument
# immediate = 0
# shift_op = {'lsl' => 0b000, 'lsr' => 0b010, 'asr' => 0b100,
# 'ror' => 0b110, 'rrx' => 0b110}[arg.type]
# if (arg.type == 'ror' and arg.value.nil?)
# # ror #0 == rrx
# raise "cannot rotate by zero #{arg} #{inspect}"
# end
#
# arg1 = arg.value
# if (arg1.is_a?(Register::IntegerConstant))
# if (arg1.value >= 32)
# raise "cannot shift by more than 31 #{arg1} #{inspect}"
# end
# shift_imm = arg1.value
# elsif (arg1.is_a?(Arm::Register))
# shift_op val |= 0x1;
# shift_imm = arg1.number << 1
# elsif (arg.type == 'rrx')
# shift_imm = 0
# end
# operand = rm_ref | (shift_op << 4) | (shift_imm << 4+3)
end
def to_s
"#{opcode} #{@left} , #{@right} #{super}"
end