SimplifyCFG: Use parallel-and and parallel-or mode to consolidate branch conditions

Merge consecutive if-regions if they contain identical statements.
Both transformations reduce number of branches.  The transformation
is guarded by a target-hook, and is currently enabled only for +R600,
but the correctness has been tested on X86 target using a variety of
CPU benchmarks.

Patch by: Mei Ye

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187278 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/Transforms/IPO/PassManagerBuilder.cpp b/lib/Transforms/IPO/PassManagerBuilder.cpp
index 1917cc8..6355204 100644
--- a/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -235,7 +235,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
   }
 
   MPM.add(createAggressiveDCEPass());         // Delete dead instructions
-  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
+  MPM.add(createCFGSimplificationPass(true)); // Merge & remove BBs
   MPM.add(createInstructionCombiningPass());  // Clean up after everything.
 
   // As an experimental mode, run any vectorization passes in a separate
@@ -371,7 +371,7 @@ void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
   PM.add(createJumpThreadingPass());
 
   // Delete basic blocks, which optimization passes may have killed.
-  PM.add(createCFGSimplificationPass());
+  PM.add(createCFGSimplificationPass(true));
 
   // Now that we have optimized the program, discard unreachable functions.
   PM.add(createGlobalDCEPass());