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Cost Model: Move the 'max unroll factor' variable to the TTI and add initial Cost Model support on ARM.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-01-09 01:15:42 +00:00
parent d700a2f9c5
commit 83be7b0dd3
9 changed files with 89 additions and 7 deletions
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5
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -116,9 +116,6 @@ static const unsigned RuntimeMemoryCheckThreshold = 4;
/// This is the highest vector width that we try to generate.
static const unsigned MaxVectorSize = 8;
/// This is the highest Unroll Factor.
static const unsigned MaxUnrollSize = 4;
namespace {
// Forward declarations.
@ -2715,6 +2712,8 @@ LoopVectorizationCostModel::selectUnrollFactor(bool OptForSize,
UF = std::min(UF, (MaxLoopSizeThreshold / R.NumInstructions));
// Clamp the unroll factor ranges to reasonable factors.
unsigned MaxUnrollSize = TTI.getMaximumUnrollFactor();
if (UF > MaxUnrollSize)
UF = MaxUnrollSize;
else if (UF < 1)