[PATCH] D46662: [X86] condition branches folding for three-way conditional codes

[Andrea Di Biagio via Phabricator via llvm-commits]

andreadb added a comment.

In https://reviews.llvm.org/D46662#1246727, @davidxl wrote:

> What is the definition of branch density?


In this context, it is the number of branches per cache line.
(See: "AMD software optimization guide for family 16h processors" - Section 2.7.1.5: "Branch Marker Caching" ).

For Jaguar, L2 BTB entries are consumed when there are more than two branches per cache line.
There is a nice description in Section 2.7.1.2 "Branch Target Buffer".

I hope it helps.
-Andrea


https://reviews.llvm.org/D46662