RE: [PATCH] powerpc/lib/sstep: Fix count leading zeros instructions
From: David Laight <hidden>
Date: 2017-10-09 15:24:03
From: naveen.n.rao@linux.vnet.ibm.com
Sent: 09 October 2017 15:48
...
This is about the behavior of the gcc builtin being undefined, rather than the actual cpu instruction itself.
I'd have hoped that the ggc builtin just generated the expected cpu instruc= tion. So is only undefined because it is very cpu dependant. More problematic here would be any cpu flag register settings. eg: x86 would set the 'Z' flag for zero input. David