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Author SHA1 Message Date
Xin Tong a4b9b9f42a Take indirect branch into account as well when folding. 
We may not be able to rewrite indirect branch target, but we also want to take it into
account when folding, i.e. if it and all its successor's predecessors go to the same
destination, we can fold, i.e. no need to thread.

llvm-svn: 301816
 2017-05-01 17:15:37 +00:00
Xin Tong 21f8ac235e [JumpThread] Do RAUW in case Cond folds to a constant in the CFG 
Summary: [JumpThread] Do RAUW in case Cond folds to a constant in the CFG

Reviewers: sanjoy

Reviewed By: sanjoy

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32407

llvm-svn: 301804
 2017-05-01 15:34:17 +00:00
Xin Tong f98602a1ab [JumpThread] We want to fold (not thread) when all predecessor go to single BB's successor. 
Summary:
In case all predecessor go to a single successor of current BB. We want to fold (not thread).

I failed to update the phi nodes properly in the last patch https://reviews.llvm.org/rL300657.

Phi nodes values are per predecessor in LLVM.

Reviewers: sanjoy

Reviewed By: sanjoy

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32400

llvm-svn: 301139
 2017-04-23 20:56:29 +00:00