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[X86] Pre-allocate some of the shuffle mask SmallVectors in the auto upgrade code instead of calling push_back in a loop. This removes the need to check if the vector needs to grow on each iteration.

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llvm-svn: 272501
This commit is contained in:
Craig Topper 2016-06-12 04:48:00 +00:00
parent b01b227720
commit fb3bf38856
1 changed files with 12 additions and 20 deletions
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32
lib/IR/AutoUpgrade.cpp
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@ -749,9 +749,9 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
unsigned NumDstElts = DstTy->getNumElements();
// Extract a subvector of the first NumDstElts lanes and sign/zero extend.
SmallVector<uint32_t, 8> ShuffleMask;
SmallVector<uint32_t, 8> ShuffleMask(NumDstElts);
for (unsigned i = 0; i != NumDstElts; ++i)
ShuffleMask.push_back(i);
ShuffleMask[i] = i;
Value *SV = Builder.CreateShuffleVector(
CI->getArgOperand(0), UndefValue::get(SrcTy), ShuffleMask);
@ -817,11 +817,9 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
VectorType *VecTy = cast<VectorType>(CI->getType());
unsigned NumElts = VecTy->getNumElements();
SmallVector<uint32_t, 16> Idxs;
for (unsigned i = 0; i != NumElts; ++i) {
unsigned Idx = ((Imm >> (i%8)) & 1) ? i + NumElts : i;
Idxs.push_back(Idx);
}
SmallVector<uint32_t, 16> Idxs(NumElts);
for (unsigned i = 0; i != NumElts; ++i)
Idxs[i] = ((Imm >> (i%8)) & 1) ? i + NumElts : i;
Rep = Builder.CreateShuffleVector(Op0, Op1, Idxs);
} else if (Name.startswith("llvm.x86.avx.vinsertf128.") ||
@ -837,10 +835,9 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
// Extend the second operand into a vector that is twice as big.
Value *UndefV = UndefValue::get(Op1->getType());
SmallVector<uint32_t, 8> Idxs;
for (unsigned i = 0; i != NumElts; ++i) {
Idxs.push_back(i);
}
SmallVector<uint32_t, 8> Idxs(NumElts);
for (unsigned i = 0; i != NumElts; ++i)
Idxs[i] = i;
Rep = Builder.CreateShuffleVector(Op1, UndefV, Idxs);
// Insert the second operand into the first operand.
@ -854,19 +851,14 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
// Imm = 1 <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 10, i32 11>
// Imm = 0 <i32 8, i32 9, i32 10, i32 11, i32 4, i32 5, i32 6, i32 7 >
Idxs.clear();
// The low half of the result is either the low half of the 1st operand
// or the low half of the 2nd operand (the inserted vector).
for (unsigned i = 0; i != NumElts / 2; ++i) {
unsigned Idx = Imm ? i : (i + NumElts);
Idxs.push_back(Idx);
}
for (unsigned i = 0; i != NumElts / 2; ++i)
Idxs[i] = Imm ? i : (i + NumElts);
// The high half of the result is either the low half of the 2nd operand
// (the inserted vector) or the high half of the 1st operand.
for (unsigned i = NumElts / 2; i != NumElts; ++i) {
unsigned Idx = Imm ? (i + NumElts / 2) : i;
Idxs.push_back(Idx);
}
for (unsigned i = NumElts / 2; i != NumElts; ++i)
Idxs[i] = Imm ? (i + NumElts / 2) : i;
Rep = Builder.CreateShuffleVector(Op0, Rep, Idxs);
} else if (Name.startswith("llvm.x86.avx.vextractf128.") ||
Name == "llvm.x86.avx2.vextracti128") {