On Mon, Aug 27, 2012 at 04:55:03PM +0530, Naveen N. Rao wrote:
> Many MCE boot flags are boolean in nature, but are declared as integers
> currently. We can pack these into a bitfield to save some space.
Note that this doesn't necessarily save anything because it needs more
code to access, and accesses are more common than the flag
cmpl $0,foo(%rip) 7 bytes
testl $1,foo(%rip) 10 bytes
bt $0,foo(%rip) 8 bytes
Even worse for writes. The best you can usually do is to use chars on
x86.
-Andi
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