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Unknown DSP opcode 0x02ca tested and figured out.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3522 8ced0084-cf51-0410-be5f-012b33b47a6e
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hrydgard 2009-06-21 11:46:27 +00:00
parent e5b75aef09
commit 1ca874365b
1 changed files with 41 additions and 0 deletions
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Source/DSPSpy/tests/op_test.ds Normal file
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; This test tries to figure out a couple of unknown opcodes.
incdir "tests"
include "dsp_base.inc"
// 0x02ca is an unknown opcode found in Zelda ucodes.
// 0x02ca logically shifts (not rotates) the whole ACC0 right by signed 16-bit value AC1.M
// (So, if AC1.M is negative, it shifts left).
// We'll call it lsrn, no arguments.
// 0x02cb is the same opcode, but arithmetic.
// We'll call it asrn, no arguments.
clr $ACC0
clr $ACC1
lri $AC0.H, #0
lri $AC0.M, #256
//neg $ACC0
lri $AC0.L, #1
lri $AC1.H, #0xFF
lri $AC1.M, #1
lri $AC1.L, #0xFF
call send_back
cw 0x02ca
call send_back
cw 0x02ca
call send_back
cw 0x02ca
call send_back
cw 0x02ca
call send_back
jmp end_of_test