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

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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
This commit is contained in:
Tom Stellard
2013-07-27 00:01:07 +00:00
parent 018696db45
commit 57e6b2d1f3
17 changed files with 628 additions and 39 deletions
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3
include/llvm/Transforms/Utils/Local.h
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@@ -39,6 +39,7 @@ class DataLayout;
class TargetLibraryInfo;
class TargetTransformInfo;
class DIBuilder;
class AliasAnalysis;
template<typename T> class SmallVectorImpl;
@@ -136,7 +137,7 @@ bool EliminateDuplicatePHINodes(BasicBlock *BB);
/// the basic block that was pointed to.
///
bool SimplifyCFG(BasicBlock *BB, const TargetTransformInfo &TTI,
const DataLayout *TD = 0);
const DataLayout *TD = 0, AliasAnalysis *AA = 0);
/// FoldBranchToCommonDest - If this basic block is ONLY a setcc and a branch,
/// and if a predecessor branches to us and one of our successors, fold the