[llvm-commits] PATCH: Provide branch weight metadata forinstrumentation branches in AddressSanitizer=

[Nuno Lopes]

In theory, the branch probability code already recognizes BBs with 
unreachable terminator and assigns them a low probability.
If that's not the case, maybe we should have a look at that.
Nuno


-----Original Message----- 
From: Chandler Carruth
Sent: Monday, July 16, 2012 10:10 AM

I have no idea if this heuristic is correct, but I suspect it's pretty 
good...

It doesn't really matter what heuristic is used if we insert 
'unreachable' -- that should trump all else, but it seemed simpler to just 
always set a flat heavy bias toward the "nothing wrong" direction. Looking 
at the asm output, the metadata has the desired effect.