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Enable partial and runtime loop unrolling for NVPTX.

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Enable partial and runtime loop unrolling for NVPTX backend via
TTI::UnrollingPreferences with a small threshold. This partially unrolls
small loops which are often unrolled by the PTX to SASS compiler
and unrolling earlier can be beneficial.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mark Heffernan 2015-07-13 18:33:21 +00:00
parent 8a9e01d606
commit 9be1720729
2 changed files with 14 additions and 0 deletions
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12
lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp
View File

@ -117,3 +117,15 @@ unsigned NVPTXTTIImpl::getArithmeticInstrCost(
Opd1PropInfo, Opd2PropInfo);
}
}
void NVPTXTTIImpl::getUnrollingPreferences(Loop *L,
TTI::UnrollingPreferences &UP) {
BaseT::getUnrollingPreferences(L, UP);
// Enable partial unrolling and runtime unrolling, but reduce the
// threshold. This partially unrolls small loops which are often
// unrolled by the PTX to SASS compiler and unrolling earlier can be
// beneficial.
UP.Partial = UP.Runtime = true;
UP.PartialThreshold = UP.Threshold / 4;
}

2
lib/Target/NVPTX/NVPTXTargetTransformInfo.h
View File

@ -58,6 +58,8 @@ public:
TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None);
void getUnrollingPreferences(Loop *L, TTI::UnrollingPreferences &UP);
};
} // end namespace llvm