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[RISCV][TTI] Refine reverse shuffle costing for high LMUL #144155

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Jun 16, 2025
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[RISCV][TTI] Refine reverse shuffle costing for high LMUL #144155

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84 changes: 62 additions & 22 deletions llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -602,6 +602,15 @@ InstructionCost RISCVTTIImpl::getSlideCost(FixedVectorType *Tp,
return FirstSlideCost + SecondSlideCost + MaskCost;
}

// Consolidate!
static MVT getLMUL1VT(MVT VT) {
assert(VT.getVectorElementType().getSizeInBits() <= 64 &&
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Should 64 here be RISCV::RVVBitsPerBlock?

"Unexpected vector MVT");
return MVT::getScalableVectorVT(
VT.getVectorElementType(),
RISCV::RVVBitsPerBlock / VT.getVectorElementType().getSizeInBits());
}

InstructionCost RISCVTTIImpl::getShuffleCost(TTI::ShuffleKind Kind,
VectorType *Tp, ArrayRef<int> Mask,
TTI::TargetCostKind CostKind,
Expand Down Expand Up @@ -840,33 +849,64 @@ InstructionCost RISCVTTIImpl::getShuffleCost(TTI::ShuffleKind Kind,
return LT.first * getRISCVInstructionCost(Opcodes, LT.second, CostKind);
}
case TTI::SK_Reverse: {

if (!LT.second.isVector())
return InstructionCost::getInvalid();

// TODO: Cases to improve here:
// * Illegal vector types
// * i64 on RV32
// * i1 vector
// At low LMUL, most of the cost is producing the vrgather index register.
// At high LMUL, the cost of the vrgather itself will dominate.
// Example sequence:
// csrr a0, vlenb
// srli a0, a0, 3
// addi a0, a0, -1
// vsetvli a1, zero, e8, mf8, ta, mu (ignored)
// vid.v v9
// vrsub.vx v10, v9, a0
// vrgather.vv v9, v8, v10
InstructionCost LenCost = 3;
if (Tp->getElementType()->isIntegerTy(1)) {
VectorType *WideTy =
VectorType::get(IntegerType::get(Tp->getContext(), 8),
cast<VectorType>(Tp)->getElementCount());
return getCastInstrCost(Instruction::ZExt, WideTy, Tp,
TTI::CastContextHint::None, CostKind) +
getShuffleCost(TTI::SK_Reverse, WideTy, {}, CostKind, 0, nullptr) +
getCastInstrCost(Instruction::Trunc, Tp, WideTy,
TTI::CastContextHint::None, CostKind);
}

MVT ContainerVT = LT.second;
if (LT.second.isFixedLengthVector())
// vrsub.vi has a 5 bit immediate field, otherwise an li suffices
LenCost = isInt<5>(LT.second.getVectorNumElements() - 1) ? 0 : 1;
unsigned Opcodes[] = {RISCV::VID_V, RISCV::VRSUB_VX, RISCV::VRGATHER_VV};
if (LT.second.isFixedLengthVector() &&
isInt<5>(LT.second.getVectorNumElements() - 1))
Opcodes[1] = RISCV::VRSUB_VI;
ContainerVT = TLI->getContainerForFixedLengthVector(LT.second);
MVT M1VT = getLMUL1VT(ContainerVT);
if (ContainerVT.bitsLE(M1VT)) {
// Example sequence:
// csrr a0, vlenb
// srli a0, a0, 3
// addi a0, a0, -1
// vsetvli a1, zero, e8, mf8, ta, mu (ignored)
// vid.v v9
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Is there a case where we have to use vrgatherei16 and i16 vid for an i8 vector reverse?

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There is. It would require fixed length vectors being generated for a <256 x i8> vector which would be fairly unlikely without rather wide zvlNb values though.

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What about scalable vectors?

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You're right, the code is using a bound on VLMAX in that case. The actual lowering also narrows the index to 16 bits if possible. I'm okay doing this as a followup, but would prefer to leave that out of this change. Are you okay with that?

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It can be done as a follow up.

// vrsub.vx v10, v9, a0
// vrgather.vv v9, v8, v10
InstructionCost LenCost = 3;
if (LT.second.isFixedLengthVector())
// vrsub.vi has a 5 bit immediate field, otherwise an li suffices
LenCost = isInt<5>(LT.second.getVectorNumElements() - 1) ? 0 : 1;
unsigned Opcodes[] = {RISCV::VID_V, RISCV::VRSUB_VX, RISCV::VRGATHER_VV};
if (LT.second.isFixedLengthVector() &&
isInt<5>(LT.second.getVectorNumElements() - 1))
Opcodes[1] = RISCV::VRSUB_VI;
InstructionCost GatherCost =
getRISCVInstructionCost(Opcodes, LT.second, CostKind);
return LT.first * (LenCost + GatherCost);
}

// At high LMUL, we split into a series of M1 reverses (see
// lowerVECTOR_REVERSE) and then do a single slide at the end to eliminate
// the resulting gap at the bottom (for fixed vectors only). The important
// bit is that the cost scales linearly, not quadratically with LMUL.
unsigned M1Opcodes[] = {RISCV::VID_V, RISCV::VRSUB_VX};
InstructionCost FixedCost =
getRISCVInstructionCost(M1Opcodes, M1VT, CostKind) + 3;
unsigned Ratio =
ContainerVT.getVectorMinNumElements() / M1VT.getVectorMinNumElements();
InstructionCost GatherCost =
getRISCVInstructionCost(Opcodes, LT.second, CostKind);
// Mask operation additionally required extend and truncate
InstructionCost ExtendCost = Tp->getElementType()->isIntegerTy(1) ? 3 : 0;
return LT.first * (LenCost + GatherCost + ExtendCost);
getRISCVInstructionCost({RISCV::VRGATHER_VV}, M1VT, CostKind) * Ratio;
InstructionCost SlideCost = !LT.second.isFixedLengthVector() ? 0 :
getRISCVInstructionCost({RISCV::VSLIDEDOWN_VX}, LT.second, CostKind);
return FixedCost + LT.first * (GatherCost + SlideCost);
}
}
return BaseT::getShuffleCost(Kind, Tp, Mask, CostKind, Index, SubTp);
Expand Down
68 changes: 34 additions & 34 deletions llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
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Expand Up @@ -78,47 +78,47 @@ declare <vscale x 16 x i32> @llvm.vector.insert.nxv16i32.nxv4i32(<vscale x 16 x

define void @vector_reverse() {
; CHECK-LABEL: 'vector_reverse'
; CHECK-NEXT: Cost Model: Found an estimated cost of 11 for instruction: %reverse_nxv16i8 = call <vscale x 16 x i8> @llvm.vector.reverse.nxv16i8(<vscale x 16 x i8> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %reverse_nxv32i8 = call <vscale x 32 x i8> @llvm.vector.reverse.nxv32i8(<vscale x 32 x i8> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv16i8 = call <vscale x 16 x i8> @llvm.vector.reverse.nxv16i8(<vscale x 16 x i8> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv32i8 = call <vscale x 32 x i8> @llvm.vector.reverse.nxv32i8(<vscale x 32 x i8> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv2i16 = call <vscale x 2 x i16> @llvm.vector.reverse.nxv2i16(<vscale x 2 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv4i16 = call <vscale x 4 x i16> @llvm.vector.reverse.nxv4i16(<vscale x 4 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 11 for instruction: %reverse_nxv8i16 = call <vscale x 8 x i16> @llvm.vector.reverse.nxv8i16(<vscale x 8 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %reverse_nxv16i16 = call <vscale x 16 x i16> @llvm.vector.reverse.nxv16i16(<vscale x 16 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 11 for instruction: %reverse_nxv4i32 = call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %reverse_nxv8i32 = call <vscale x 8 x i32> @llvm.vector.reverse.nxv8i32(<vscale x 8 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 83 for instruction: %reverse_nxv16i32 = call <vscale x 16 x i32> @llvm.vector.reverse.nxv16i32(<vscale x 16 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 166 for instruction: %reverse_nxv32i32 = call <vscale x 32 x i32> @llvm.vector.reverse.nxv32i32(<vscale x 32 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 11 for instruction: %reverse_nxv2i64 = call <vscale x 2 x i64> @llvm.vector.reverse.nxv2i64(<vscale x 2 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 27 for instruction: %reverse_nxv4i64 = call <vscale x 4 x i64> @llvm.vector.reverse.nxv4i64(<vscale x 4 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 83 for instruction: %reverse_nxv8i64 = call <vscale x 8 x i64> @llvm.vector.reverse.nxv8i64(<vscale x 8 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 166 for instruction: %reverse_nxv16i64 = call <vscale x 16 x i64> @llvm.vector.reverse.nxv16i64(<vscale x 16 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 332 for instruction: %reverse_nxv32i64 = call <vscale x 32 x i64> @llvm.vector.reverse.nxv32i64(<vscale x 32 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 14 for instruction: %reverse_nxv16i1 = call <vscale x 16 x i1> @llvm.vector.reverse.nxv16i1(<vscale x 16 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv8i1 = call <vscale x 8 x i1> @llvm.vector.reverse.nxv8i1(<vscale x 8 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv4i1 = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv2i1 = call <vscale x 2 x i1> @llvm.vector.reverse.nxv2i1(<vscale x 2 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv8i16 = call <vscale x 8 x i16> @llvm.vector.reverse.nxv8i16(<vscale x 8 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv16i16 = call <vscale x 16 x i16> @llvm.vector.reverse.nxv16i16(<vscale x 16 x i16> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv4i32 = call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv8i32 = call <vscale x 8 x i32> @llvm.vector.reverse.nxv8i32(<vscale x 8 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 13 for instruction: %reverse_nxv16i32 = call <vscale x 16 x i32> @llvm.vector.reverse.nxv16i32(<vscale x 16 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 21 for instruction: %reverse_nxv32i32 = call <vscale x 32 x i32> @llvm.vector.reverse.nxv32i32(<vscale x 32 x i32> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv2i64 = call <vscale x 2 x i64> @llvm.vector.reverse.nxv2i64(<vscale x 2 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv4i64 = call <vscale x 4 x i64> @llvm.vector.reverse.nxv4i64(<vscale x 4 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 13 for instruction: %reverse_nxv8i64 = call <vscale x 8 x i64> @llvm.vector.reverse.nxv8i64(<vscale x 8 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 21 for instruction: %reverse_nxv16i64 = call <vscale x 16 x i64> @llvm.vector.reverse.nxv16i64(<vscale x 16 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 37 for instruction: %reverse_nxv32i64 = call <vscale x 32 x i64> @llvm.vector.reverse.nxv32i64(<vscale x 32 x i64> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 15 for instruction: %reverse_nxv16i1 = call <vscale x 16 x i1> @llvm.vector.reverse.nxv16i1(<vscale x 16 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv8i1 = call <vscale x 8 x i1> @llvm.vector.reverse.nxv8i1(<vscale x 8 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv4i1 = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv2i1 = call <vscale x 2 x i1> @llvm.vector.reverse.nxv2i1(<vscale x 2 x i1> undef)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; SIZE-LABEL: 'vector_reverse'
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv16i8 = call <vscale x 16 x i8> @llvm.vector.reverse.nxv16i8(<vscale x 16 x i8> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv32i8 = call <vscale x 32 x i8> @llvm.vector.reverse.nxv32i8(<vscale x 32 x i8> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv16i8 = call <vscale x 16 x i8> @llvm.vector.reverse.nxv16i8(<vscale x 16 x i8> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv32i8 = call <vscale x 32 x i8> @llvm.vector.reverse.nxv32i8(<vscale x 32 x i8> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv2i16 = call <vscale x 2 x i16> @llvm.vector.reverse.nxv2i16(<vscale x 2 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv4i16 = call <vscale x 4 x i16> @llvm.vector.reverse.nxv4i16(<vscale x 4 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv8i16 = call <vscale x 8 x i16> @llvm.vector.reverse.nxv8i16(<vscale x 8 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv16i16 = call <vscale x 16 x i16> @llvm.vector.reverse.nxv16i16(<vscale x 16 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv4i32 = call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv8i32 = call <vscale x 8 x i32> @llvm.vector.reverse.nxv8i32(<vscale x 8 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv16i32 = call <vscale x 16 x i32> @llvm.vector.reverse.nxv16i32(<vscale x 16 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %reverse_nxv32i32 = call <vscale x 32 x i32> @llvm.vector.reverse.nxv32i32(<vscale x 32 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv2i64 = call <vscale x 2 x i64> @llvm.vector.reverse.nxv2i64(<vscale x 2 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv4i64 = call <vscale x 4 x i64> @llvm.vector.reverse.nxv4i64(<vscale x 4 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 6 for instruction: %reverse_nxv8i64 = call <vscale x 8 x i64> @llvm.vector.reverse.nxv8i64(<vscale x 8 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 12 for instruction: %reverse_nxv16i64 = call <vscale x 16 x i64> @llvm.vector.reverse.nxv16i64(<vscale x 16 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 24 for instruction: %reverse_nxv32i64 = call <vscale x 32 x i64> @llvm.vector.reverse.nxv32i64(<vscale x 32 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv16i1 = call <vscale x 16 x i1> @llvm.vector.reverse.nxv16i1(<vscale x 16 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv8i1 = call <vscale x 8 x i1> @llvm.vector.reverse.nxv8i1(<vscale x 8 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv4i1 = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv2i1 = call <vscale x 2 x i1> @llvm.vector.reverse.nxv2i1(<vscale x 2 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv8i16 = call <vscale x 8 x i16> @llvm.vector.reverse.nxv8i16(<vscale x 8 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv16i16 = call <vscale x 16 x i16> @llvm.vector.reverse.nxv16i16(<vscale x 16 x i16> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv4i32 = call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv8i32 = call <vscale x 8 x i32> @llvm.vector.reverse.nxv8i32(<vscale x 8 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 13 for instruction: %reverse_nxv16i32 = call <vscale x 16 x i32> @llvm.vector.reverse.nxv16i32(<vscale x 16 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 21 for instruction: %reverse_nxv32i32 = call <vscale x 32 x i32> @llvm.vector.reverse.nxv32i32(<vscale x 32 x i32> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 7 for instruction: %reverse_nxv2i64 = call <vscale x 2 x i64> @llvm.vector.reverse.nxv2i64(<vscale x 2 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 9 for instruction: %reverse_nxv4i64 = call <vscale x 4 x i64> @llvm.vector.reverse.nxv4i64(<vscale x 4 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 13 for instruction: %reverse_nxv8i64 = call <vscale x 8 x i64> @llvm.vector.reverse.nxv8i64(<vscale x 8 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 21 for instruction: %reverse_nxv16i64 = call <vscale x 16 x i64> @llvm.vector.reverse.nxv16i64(<vscale x 16 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 37 for instruction: %reverse_nxv32i64 = call <vscale x 32 x i64> @llvm.vector.reverse.nxv32i64(<vscale x 32 x i64> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 11 for instruction: %reverse_nxv16i1 = call <vscale x 16 x i1> @llvm.vector.reverse.nxv16i1(<vscale x 16 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv8i1 = call <vscale x 8 x i1> @llvm.vector.reverse.nxv8i1(<vscale x 8 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv4i1 = call <vscale x 4 x i1> @llvm.vector.reverse.nxv4i1(<vscale x 4 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 10 for instruction: %reverse_nxv2i1 = call <vscale x 2 x i1> @llvm.vector.reverse.nxv2i1(<vscale x 2 x i1> undef)
; SIZE-NEXT: Cost Model: Found an estimated cost of 1 for instruction: ret void
;
%reverse_nxv16i8 = call <vscale x 16 x i8> @llvm.vector.reverse.nxv16i8(<vscale x 16 x i8> undef)
Expand Down
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