问题
I've read the other posts here, but still have a question about PPC and rlwinm.
The example I'm looking at is:
li r0, 0x100
clrlslwi r9, r0, 27,5 (which afaik is the same as rlwinm r9, r0,5,22,26)
First I load r0 = 0x100 Then Left Shift r0 by 5 so r0 = 0x2000 (No overflow, so no rotate needed)
Make a Mask with bits 22 to 26 set = 0x3e0
AND r0 with the Mask = 0x2000 AND 0x3E0 = 0
I must be doing something wrong...this would always net 0 What am I missing?
来源：https://stackoverflow.com/questions/36657387/powerpc-and-the-clrlslwi-or-rlwinm-instruction