6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-28 06:24:57 +00:00
Code Issues Projects Releases Wiki Activity

ARM cost model: Account for zero cost scalar SROA instructions

Browse Source 
By vectorizing a series of srl, or, ... instructions we have obfuscated the
intention so much that the backend does not know how to fold this code away.

radar://15336950

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193573 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2013-10-29 01:33:53 +00:00
parent 4a6b3a9a77
commit 7e8cebf22d
3 changed files with 84 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
lib/Transforms/Vectorize/SLPVectorizer.cpp
View File

@ -1013,9 +1013,24 @@ int BoUpSLP::getEntryCost(TreeEntry *E) {
TTI->getCmpSelInstrCost(Opcode, ScalarTy, Builder.getInt1Ty());
VecCost = TTI->getCmpSelInstrCost(Opcode, VecTy, MaskTy);
} else {
ScalarCost = VecTy->getNumElements() *
TTI->getArithmeticInstrCost(Opcode, ScalarTy);
VecCost = TTI->getArithmeticInstrCost(Opcode, VecTy);
// Certain instructions can be cheaper to vectorize if they have a
// constant second vector operand.
TargetTransformInfo::OperandValueKind Op1VK =
TargetTransformInfo::OK_AnyValue;
TargetTransformInfo::OperandValueKind Op2VK =
TargetTransformInfo::OK_UniformConstantValue;
// Check whether all second operands are constant.
for (unsigned i = 0; i < VL.size(); ++i)
if (!isa<ConstantInt>(cast<Instruction>(VL[i])->getOperand(1))) {
Op2VK = TargetTransformInfo::OK_AnyValue;
break;
}
ScalarCost =
VecTy->getNumElements() *
TTI->getArithmeticInstrCost(Opcode, ScalarTy, Op1VK, Op2VK);
VecCost = TTI->getArithmeticInstrCost(Opcode, VecTy, Op1VK, Op2VK);
}
return VecCost - ScalarCost;
}