tree 120e419524ae376b89f5a68d8480e01ce712ea86
parent 3cbd1786ac06fe751dc4b5ad55e75115cb1d51ce
author Manman Ren <mren@apple.com> 1347669597 +0000
committer Manman Ren <mren@apple.com> 1347669597 +0000

PGO: preserve branch-weight metadata when simplifying two branches with a common
destination.

Updated previous implementation to fix a case not covered:
// PBI: br i1 %x, TrueDest, BB
// BI:  br i1 %y, TrueDest, FalseDest
The other case was handled correctly.
// PBI: br i1 %x, BB, FalseDest
// BI:  br i1 %y, TrueDest, FalseDest

Also tried to use 64-bit arithmetic instead of APInt with scale to simplify the
computation. Let me know if you have other opinions about this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163954 91177308-0d34-0410-b5e6-96231b3b80d8