See image: Dolphin Emulator setup
I am attempting to use Dolphin Wii emulator's debugger. It emulates a Broadway microprocessor (https://en.wikipedia.org/wiki/Broadway_(microprocessor)). The green bar indicates the next instruction that will be performed. If r0 = 0000006c and r3 = 817d34e0, what will the result of lwzx r3, r3, r0 be?
Dolphin says the result is r3 = 920d5fd0 when I step into that instruction. I though the result would be the sum of r3 and r0 stored in r3 so r3 should equal 817d354c.
Where have I gone wrong?
The debugger is known to have some issues so there could be a problem with it but I'm assuming I'm wrong.
Thanks!
Found the answer on a different forum https://forums.dolphin-emu.org/Thread-powerpc-lwzx?pid=454986#pid454986.
Quote from JonnyH:
lwzx[0] appears to be a "load word from address" instruction - from my understanding it doesn't store the result of (r3 + r0) in r3, but it stores the memory value at address (r3 + r0) into r3. So presumably there's the value 0x920d5fd0 in the memory at address 0x817d354c? [0] https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.alangref/idalangref_lwzx_lx_lwzi_instrus.htm
