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[RISCV] Add cost for @llvm.vector.splice.{left,right} #179219

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Merged
lukel97 merged 4 commits into from
Feb 9, 2026
Merged

[RISCV] Add cost for @llvm.vector.splice.{left,right} #179219

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5ff958d
Precommit tests
lukel97 Feb 2, 2026
639b544
[RISCV] Add cost for @llvm.vector.splice.{left,right}
lukel97 Feb 2, 2026
5301f35
Fix constant offset costs
lukel97 Feb 3, 2026
d2a1224
Merge branch 'main' into riscv/splice-variable-offset-costmodel
lukel97 Feb 9, 2026
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13 changes: 13 additions & 0 deletions llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1628,6 +1628,19 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
getRISCVInstructionCost(RISCV::VADD_VX, LT.second, CostKind);
return 1 + (LT.first - 1);
}
case Intrinsic::vector_splice_left:
case Intrinsic::vector_splice_right: {
auto LT = getTypeLegalizationCost(RetTy);
// Constant offsets fall through to getShuffleCost.
if (!ICA.isTypeBasedOnly() && isa<ConstantInt>(ICA.getArgs()[2]))
break;
if (ST->hasVInstructions() && LT.second.isVector()) {
return LT.first *
getRISCVInstructionCost({RISCV::VSLIDEDOWN_VX, RISCV::VSLIDEUP_VX},
LT.second, CostKind);
}
break;
}
case Intrinsic::experimental_cttz_elts: {
Type *ArgTy = ICA.getArgTypes()[0];
EVT ArgType = TLI->getValueType(DL, ArgTy, true);
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49 changes: 16 additions & 33 deletions llvm/test/Analysis/CostModel/RISCV/rvv-shuffle.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -148,39 +148,22 @@ define void @vector_reverse() {
}

define void @vector_splice() {
; ARGBASED-LABEL: 'vector_splice'
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %1 = call <vscale x 16 x i8> @llvm.vector.splice.left.nxv16i8(<vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %2 = call <vscale x 32 x i8> @llvm.vector.splice.left.nxv32i8(<vscale x 32 x i8> zeroinitializer, <vscale x 32 x i8> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %3 = call <vscale x 2 x i16> @llvm.vector.splice.left.nxv2i16(<vscale x 2 x i16> zeroinitializer, <vscale x 2 x i16> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %4 = call <vscale x 4 x i16> @llvm.vector.splice.left.nxv4i16(<vscale x 4 x i16> zeroinitializer, <vscale x 4 x i16> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %5 = call <vscale x 8 x i16> @llvm.vector.splice.left.nxv8i16(<vscale x 8 x i16> zeroinitializer, <vscale x 8 x i16> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %6 = call <vscale x 16 x i16> @llvm.vector.splice.left.nxv16i16(<vscale x 16 x i16> zeroinitializer, <vscale x 16 x i16> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %7 = call <vscale x 4 x i32> @llvm.vector.splice.left.nxv4i32(<vscale x 4 x i32> zeroinitializer, <vscale x 4 x i32> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %8 = call <vscale x 8 x i32> @llvm.vector.splice.left.nxv8i32(<vscale x 8 x i32> zeroinitializer, <vscale x 8 x i32> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %9 = call <vscale x 2 x i64> @llvm.vector.splice.left.nxv2i64(<vscale x 2 x i64> zeroinitializer, <vscale x 2 x i64> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %10 = call <vscale x 4 x i64> @llvm.vector.splice.left.nxv4i64(<vscale x 4 x i64> zeroinitializer, <vscale x 4 x i64> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %11 = call <vscale x 16 x i1> @llvm.vector.splice.left.nxv16i1(<vscale x 16 x i1> zeroinitializer, <vscale x 16 x i1> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %12 = call <vscale x 8 x i1> @llvm.vector.splice.left.nxv8i1(<vscale x 8 x i1> zeroinitializer, <vscale x 8 x i1> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %13 = call <vscale x 4 x i1> @llvm.vector.splice.left.nxv4i1(<vscale x 4 x i1> zeroinitializer, <vscale x 4 x i1> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %14 = call <vscale x 2 x i1> @llvm.vector.splice.left.nxv2i1(<vscale x 2 x i1> zeroinitializer, <vscale x 2 x i1> zeroinitializer, i32 1)
; ARGBASED-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; TYPEBASED-LABEL: 'vector_splice'
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %1 = call <vscale x 16 x i8> @llvm.vector.splice.left.nxv16i8(<vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %2 = call <vscale x 32 x i8> @llvm.vector.splice.left.nxv32i8(<vscale x 32 x i8> zeroinitializer, <vscale x 32 x i8> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %3 = call <vscale x 2 x i16> @llvm.vector.splice.left.nxv2i16(<vscale x 2 x i16> zeroinitializer, <vscale x 2 x i16> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %4 = call <vscale x 4 x i16> @llvm.vector.splice.left.nxv4i16(<vscale x 4 x i16> zeroinitializer, <vscale x 4 x i16> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %5 = call <vscale x 8 x i16> @llvm.vector.splice.left.nxv8i16(<vscale x 8 x i16> zeroinitializer, <vscale x 8 x i16> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %6 = call <vscale x 16 x i16> @llvm.vector.splice.left.nxv16i16(<vscale x 16 x i16> zeroinitializer, <vscale x 16 x i16> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %7 = call <vscale x 4 x i32> @llvm.vector.splice.left.nxv4i32(<vscale x 4 x i32> zeroinitializer, <vscale x 4 x i32> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %8 = call <vscale x 8 x i32> @llvm.vector.splice.left.nxv8i32(<vscale x 8 x i32> zeroinitializer, <vscale x 8 x i32> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %9 = call <vscale x 2 x i64> @llvm.vector.splice.left.nxv2i64(<vscale x 2 x i64> zeroinitializer, <vscale x 2 x i64> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %10 = call <vscale x 4 x i64> @llvm.vector.splice.left.nxv4i64(<vscale x 4 x i64> zeroinitializer, <vscale x 4 x i64> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %11 = call <vscale x 16 x i1> @llvm.vector.splice.left.nxv16i1(<vscale x 16 x i1> zeroinitializer, <vscale x 16 x i1> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %12 = call <vscale x 8 x i1> @llvm.vector.splice.left.nxv8i1(<vscale x 8 x i1> zeroinitializer, <vscale x 8 x i1> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %13 = call <vscale x 4 x i1> @llvm.vector.splice.left.nxv4i1(<vscale x 4 x i1> zeroinitializer, <vscale x 4 x i1> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Invalid cost for instruction: %14 = call <vscale x 2 x i1> @llvm.vector.splice.left.nxv2i1(<vscale x 2 x i1> zeroinitializer, <vscale x 2 x i1> zeroinitializer, i32 1)
; TYPEBASED-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
; CHECK-LABEL: 'vector_splice'
; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %1 = call <vscale x 16 x i8> @llvm.vector.splice.left.nxv16i8(<vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %2 = call <vscale x 32 x i8> @llvm.vector.splice.left.nxv32i8(<vscale x 32 x i8> zeroinitializer, <vscale x 32 x i8> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %3 = call <vscale x 2 x i16> @llvm.vector.splice.left.nxv2i16(<vscale x 2 x i16> zeroinitializer, <vscale x 2 x i16> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %4 = call <vscale x 4 x i16> @llvm.vector.splice.left.nxv4i16(<vscale x 4 x i16> zeroinitializer, <vscale x 4 x i16> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %5 = call <vscale x 8 x i16> @llvm.vector.splice.left.nxv8i16(<vscale x 8 x i16> zeroinitializer, <vscale x 8 x i16> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %6 = call <vscale x 16 x i16> @llvm.vector.splice.left.nxv16i16(<vscale x 16 x i16> zeroinitializer, <vscale x 16 x i16> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %7 = call <vscale x 4 x i32> @llvm.vector.splice.left.nxv4i32(<vscale x 4 x i32> zeroinitializer, <vscale x 4 x i32> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %8 = call <vscale x 8 x i32> @llvm.vector.splice.left.nxv8i32(<vscale x 8 x i32> zeroinitializer, <vscale x 8 x i32> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %9 = call <vscale x 2 x i64> @llvm.vector.splice.left.nxv2i64(<vscale x 2 x i64> zeroinitializer, <vscale x 2 x i64> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 8 for instruction: %10 = call <vscale x 4 x i64> @llvm.vector.splice.left.nxv4i64(<vscale x 4 x i64> zeroinitializer, <vscale x 4 x i64> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 4 for instruction: %11 = call <vscale x 16 x i1> @llvm.vector.splice.left.nxv16i1(<vscale x 16 x i1> zeroinitializer, <vscale x 16 x i1> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %12 = call <vscale x 8 x i1> @llvm.vector.splice.left.nxv8i1(<vscale x 8 x i1> zeroinitializer, <vscale x 8 x i1> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %13 = call <vscale x 4 x i1> @llvm.vector.splice.left.nxv4i1(<vscale x 4 x i1> zeroinitializer, <vscale x 4 x i1> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %14 = call <vscale x 2 x i1> @llvm.vector.splice.left.nxv2i1(<vscale x 2 x i1> zeroinitializer, <vscale x 2 x i1> zeroinitializer, i32 1)
; CHECK-NEXT: Cost Model: Found an estimated cost of 0 for instruction: ret void
;
; SIZE-LABEL: 'vector_splice'
; SIZE-NEXT: Cost Model: Found an estimated cost of 2 for instruction: %1 = call <vscale x 16 x i8> @llvm.vector.splice.left.nxv16i8(<vscale x 16 x i8> zeroinitializer, <vscale x 16 x i8> zeroinitializer, i32 1)
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