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Move the max vector width to a constant parameter. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168570 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-11-25 16:48:08 +00:00
parent 00e8074ee2
commit 6bfc3481bd
1 changed files with 7 additions and 5 deletions
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12
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -86,6 +86,9 @@ const unsigned TinyTripCountThreshold = 16;
/// number of pointers. Notice that the check is quadratic!
const unsigned RuntimeMemoryCheckThreshold = 2;
/// This is the highest vector width that we try to generate.
const unsigned MaxVectorSize = 8;
namespace {
// Forward declarations.
@ -130,7 +133,7 @@ public:
private:
/// Add code that checks at runtime if the accessed arrays overlap.
/// Returns the comperator value or NULL if no check is needed.
Value* addRuntimeCheck(LoopVectorizationLegality *Legal,
Value* addRuntimeCheck(LoopVectorizationLegality *Legal,
Instruction *Loc);
/// Create an empty loop, based on the loop ranges of the old loop.
void createEmptyLoop(LoopVectorizationLegality *Legal);
@ -400,7 +403,7 @@ public:
/// Returns the most profitable vectorization factor for the loop that is
/// smaller or equal to the VF argument. This method checks every power
/// of two up to VF.
unsigned findBestVectorizationFactor(unsigned VF = 8);
unsigned findBestVectorizationFactor(unsigned VF = MaxVectorSize);
private:
/// Returns the expected execution cost. The unit of the cost does
@ -856,13 +859,12 @@ SingleBlockLoopVectorizer::createEmptyLoop(LoopVectorizationLegality *Legal) {
StartIdx,
"cmp.zero", Loc);
Value *MemoryRuntimeCheck = addRuntimeCheck(Legal, Loc);
Value *MemoryRuntimeCheck = addRuntimeCheck(Legal, Loc);
// If we are using memory runtime checks, include them in.
if (MemoryRuntimeCheck) {
if (MemoryRuntimeCheck)
Cmp = BinaryOperator::Create(Instruction::Or, Cmp, MemoryRuntimeCheck,
"CntOrMem", Loc);
}
BranchInst::Create(MiddleBlock, VectorPH, Cmp, Loc);
// Remove the old terminator.