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[SimplifyCFG] Be more aggressive

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Up the phi node folding threshold from a cheap "1" to a meagre "2".

Update tests for extra added selects and slight code churn.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229099 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2015-02-13 10:48:30 +00:00
parent 94b64060af
commit c76bff0715
3 changed files with 15 additions and 37 deletions
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8
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -53,9 +53,13 @@ using namespace PatternMatch;
#define DEBUG_TYPE "simplifycfg"
// Chosen as 2 so as to be cheap, but still to have enough power to fold
// a select, so the "clamp" idiom (of a min followed by a max) will be caught.
// To catch this, we need to fold a compare and a select, hence '2' being the
// minimum reasonable default.
static cl::opt<unsigned>
PHINodeFoldingThreshold("phi-node-folding-threshold", cl::Hidden, cl::init(1),
cl::desc("Control the amount of phi node folding to perform (default = 1)"));
PHINodeFoldingThreshold("phi-node-folding-threshold", cl::Hidden, cl::init(2),
cl::desc("Control the amount of phi node folding to perform (default = 2)"));
static cl::opt<bool>
DupRet("simplifycfg-dup-ret", cl::Hidden, cl::init(false),