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add minor docs to thumb move shifted reg

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Matthew Berry 2021-05-17 21:04:54 -07:00
parent d5c06fef98
commit 026b86c891
1 changed files with 2 additions and 1 deletions
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src/crab/gba/thumb/move_shifted_register.cr
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@ -10,6 +10,7 @@ module GBA
when 0b00 then set_reg(rd, lsl(@r[rs], offset, pointerof(carry_out))) when 0b00 then set_reg(rd, lsl(@r[rs], offset, pointerof(carry_out)))
when 0b01 then set_reg(rd, lsr(@r[rs], offset, true, pointerof(carry_out))) when 0b01 then set_reg(rd, lsr(@r[rs], offset, true, pointerof(carry_out)))
when 0b10 then set_reg(rd, asr(@r[rs], offset, true, pointerof(carry_out))) when 0b10 then set_reg(rd, asr(@r[rs], offset, true, pointerof(carry_out)))
when 0b11 # encodes thumb add/subtract
else raise "Invalid shifted register op: #{op}" else raise "Invalid shifted register op: #{op}"
end end
set_neg_and_zero_flags(@r[rd]) set_neg_and_zero_flags(@r[rd])