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[RISCV] Fold vp.store(vp.reverse(VAL), ADDR, MASK) -> vp.strided.store(VAL, NEW_ADDR, -1, MASK) #123123

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Jan 17, 2025
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[RISCV] Fold vp.store(vp.reverse(VAL), ADDR, MASK) -> vp.strided.store(VAL, NEW_ADDR, -1, MASK) #123123

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8367247
[RISCV] Fold vp.store(vp.reverse(VAL), ADDR, MASK) -> vp.strided.stor…
topperc Jan 15, 2025
2a71d04
Merge remote-tracking branch 'origin/main' into pr/store-reverse
topperc Jan 16, 2025
395376d
fixup! update comments
topperc Jan 16, 2025
bb3f013
Merge remote-tracking branch 'origin/main' into pr/store-reverse
topperc Jan 17, 2025
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77 changes: 71 additions & 6 deletions llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1524,13 +1524,17 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
setTargetDAGCombine({ISD::ZERO_EXTEND, ISD::FP_TO_SINT, ISD::FP_TO_UINT,
ISD::FP_TO_SINT_SAT, ISD::FP_TO_UINT_SAT});
if (Subtarget.hasVInstructions())
setTargetDAGCombine({ISD::FCOPYSIGN, ISD::MGATHER, ISD::MSCATTER,
ISD::VP_GATHER, ISD::VP_SCATTER, ISD::SRA, ISD::SRL,
ISD::SHL, ISD::STORE, ISD::SPLAT_VECTOR,
setTargetDAGCombine({ISD::FCOPYSIGN, ISD::MGATHER,
ISD::MSCATTER, ISD::VP_GATHER,
ISD::VP_SCATTER, ISD::SRA,
ISD::SRL, ISD::SHL,
ISD::STORE, ISD::SPLAT_VECTOR,
ISD::BUILD_VECTOR, ISD::CONCAT_VECTORS,
ISD::EXPERIMENTAL_VP_REVERSE, ISD::MUL,
ISD::SDIV, ISD::UDIV, ISD::SREM, ISD::UREM,
ISD::INSERT_VECTOR_ELT, ISD::ABS, ISD::CTPOP});
ISD::VP_STORE, ISD::EXPERIMENTAL_VP_REVERSE,
ISD::MUL, ISD::SDIV,
ISD::UDIV, ISD::SREM,
ISD::UREM, ISD::INSERT_VECTOR_ELT,
ISD::ABS, ISD::CTPOP});
if (Subtarget.hasVendorXTHeadMemPair())
setTargetDAGCombine({ISD::LOAD, ISD::STORE});
if (Subtarget.useRVVForFixedLengthVectors())
Expand Down Expand Up @@ -16291,6 +16295,65 @@ static SDValue performVP_REVERSECombine(SDNode *N, SelectionDAG &DAG,
return Ret;
}

static SDValue performVP_STORECombine(SDNode *N, SelectionDAG &DAG,
const RISCVSubtarget &Subtarget) {
// Fold:
// vp.store(vp.reverse(VAL), ADDR, MASK) -> vp.strided.store(VAL, NEW_ADDR,
// -1, MASK)
auto *VPStore = cast<VPStoreSDNode>(N);

if (VPStore->getValue().getOpcode() != ISD::EXPERIMENTAL_VP_REVERSE)
return SDValue();

SDValue VPReverse = VPStore->getValue();
EVT ReverseVT = VPReverse->getValueType(0);

// We do not have a strided_store version for masks, and the evl of vp.reverse
// and vp.store should always be the same.
if (!ReverseVT.getVectorElementType().isByteSized() ||
VPStore->getVectorLength() != VPReverse.getOperand(2) ||
!VPReverse.hasOneUse())
return SDValue();

SDValue StoreMask = VPStore->getMask();
// If Mask is all ones, then load is unmasked and can be reversed.
if (!isOneOrOneSplat(StoreMask)) {
// If the mask is not all ones, we can reverse the store if the mask was
// also reversed by an unmasked vp.reverse with the same EVL.
if (StoreMask.getOpcode() != ISD::EXPERIMENTAL_VP_REVERSE ||
!isOneOrOneSplat(StoreMask.getOperand(1)) ||
StoreMask.getOperand(2) != VPStore->getVectorLength())
return SDValue();
StoreMask = StoreMask.getOperand(0);
}

// Base = StoreAddr + (NumElem - 1) * ElemWidthByte
SDLoc DL(N);
MVT XLenVT = Subtarget.getXLenVT();
SDValue NumElem = VPStore->getVectorLength();
uint64_t ElemWidthByte = VPReverse.getValueType().getScalarSizeInBits() / 8;

SDValue Temp1 = DAG.getNode(ISD::SUB, DL, XLenVT, NumElem,
DAG.getConstant(1, DL, XLenVT));
SDValue Temp2 = DAG.getNode(ISD::MUL, DL, XLenVT, Temp1,
DAG.getConstant(ElemWidthByte, DL, XLenVT));
SDValue Base =
DAG.getNode(ISD::ADD, DL, XLenVT, VPStore->getBasePtr(), Temp2);
SDValue Stride = DAG.getConstant(-ElemWidthByte, DL, XLenVT);

MachineFunction &MF = DAG.getMachineFunction();
MachinePointerInfo PtrInfo(VPStore->getAddressSpace());
MachineMemOperand *MMO = MF.getMachineMemOperand(
PtrInfo, VPStore->getMemOperand()->getFlags(),
LocationSize::beforeOrAfterPointer(), VPStore->getAlign());

return DAG.getStridedStoreVP(
VPStore->getChain(), DL, VPReverse.getOperand(0), Base,
VPStore->getOffset(), Stride, StoreMask, VPStore->getVectorLength(),
VPStore->getMemoryVT(), MMO, VPStore->getAddressingMode(),
VPStore->isTruncatingStore(), VPStore->isCompressingStore());
}

// Convert from one FMA opcode to another based on whether we are negating the
// multiply result and/or the accumulator.
// NOTE: Only supports RVV operations with VL.
Expand Down Expand Up @@ -18436,6 +18499,8 @@ SDValue RISCVTargetLowering::PerformDAGCombine(SDNode *N,
}
case ISD::EXPERIMENTAL_VP_REVERSE:
return performVP_REVERSECombine(N, DAG, Subtarget);
case ISD::VP_STORE:
return performVP_STORECombine(N, DAG, Subtarget);
case ISD::BITCAST: {
assert(Subtarget.useRVVForFixedLengthVectors());
SDValue N0 = N->getOperand(0);
Expand Down
81 changes: 81 additions & 0 deletions llvm/test/CodeGen/RISCV/rvv/vp-combine-store-reverse.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,81 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv64 -mattr=+f,+v -verify-machineinstrs < %s | FileCheck %s

define void @test_store_reverse_combiner(<vscale x 2 x float> %val, <vscale x 2 x float>* %ptr, i32 zeroext %evl) {
; CHECK-LABEL: test_store_reverse_combiner:
; CHECK: # %bb.0:
; CHECK-NEXT: slli a2, a1, 2
; CHECK-NEXT: add a0, a2, a0
; CHECK-NEXT: addi a0, a0, -4
; CHECK-NEXT: li a2, -4
; CHECK-NEXT: vsetvli zero, a1, e32, m1, ta, ma
; CHECK-NEXT: vsse32.v v8, (a0), a2
; CHECK-NEXT: ret
%rev = call <vscale x 2 x float> @llvm.experimental.vp.reverse.nxv2f32(<vscale x 2 x float> %val, <vscale x 2 x i1> splat (i1 true), i32 %evl)
call void @llvm.vp.store.nxv2f32.p0nxv2f32(<vscale x 2 x float> %rev, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> splat (i1 true), i32 %evl)
ret void
}

define void @test_store_mask_is_vp_reverse(<vscale x 2 x float> %val, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %mask, i32 zeroext %evl) {
; CHECK-LABEL: test_store_mask_is_vp_reverse:
; CHECK: # %bb.0:
; CHECK-NEXT: slli a2, a1, 2
; CHECK-NEXT: add a0, a2, a0
; CHECK-NEXT: addi a0, a0, -4
; CHECK-NEXT: li a2, -4
; CHECK-NEXT: vsetvli zero, a1, e32, m1, ta, ma
; CHECK-NEXT: vsse32.v v8, (a0), a2, v0.t
; CHECK-NEXT: ret
%storemask = call <vscale x 2 x i1> @llvm.experimental.vp.reverse.nxv2i1(<vscale x 2 x i1> %mask, <vscale x 2 x i1> splat (i1 true), i32 %evl)
%rev = call <vscale x 2 x float> @llvm.experimental.vp.reverse.nxv2f32(<vscale x 2 x float> %val, <vscale x 2 x i1> splat (i1 true), i32 %evl)
call void @llvm.vp.store.nxv2f32.p0nxv2f32(<vscale x 2 x float> %rev, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %storemask, i32 %evl)
ret void
}

define void @test_store_mask_not_all_one(<vscale x 2 x float> %val, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %notallones, i32 zeroext %evl) {
; CHECK-LABEL: test_store_mask_not_all_one:
; CHECK: # %bb.0:
; CHECK-NEXT: vsetvli zero, a1, e32, m1, ta, ma
; CHECK-NEXT: vid.v v9, v0.t
; CHECK-NEXT: addi a1, a1, -1
; CHECK-NEXT: vrsub.vx v9, v9, a1, v0.t
; CHECK-NEXT: vrgather.vv v10, v8, v9, v0.t
; CHECK-NEXT: vse32.v v10, (a0), v0.t
; CHECK-NEXT: ret
%rev = call <vscale x 2 x float> @llvm.experimental.vp.reverse.nxv2f32(<vscale x 2 x float> %val, <vscale x 2 x i1> %notallones, i32 %evl)
call void @llvm.vp.store.nxv2f32.p0nxv2f32(<vscale x 2 x float> %rev, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %notallones, i32 %evl)
ret void
}

define void @test_different_evl(<vscale x 2 x float> %val, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %mask, i32 zeroext %evl1, i32 zeroext %evl2) {
; CHECK-LABEL: test_different_evl:
; CHECK: # %bb.0:
; CHECK-NEXT: vsetvli zero, a1, e16, mf2, ta, ma
; CHECK-NEXT: vid.v v9
; CHECK-NEXT: addi a1, a1, -1
; CHECK-NEXT: vsetvli zero, zero, e8, mf4, ta, ma
; CHECK-NEXT: vmv.v.i v10, 0
; CHECK-NEXT: vmerge.vim v10, v10, 1, v0
; CHECK-NEXT: vsetvli zero, zero, e32, m1, ta, ma
; CHECK-NEXT: vid.v v11
; CHECK-NEXT: vsetvli zero, zero, e16, mf2, ta, ma
; CHECK-NEXT: vrsub.vx v9, v9, a1
; CHECK-NEXT: vsetvli zero, zero, e32, m1, ta, ma
; CHECK-NEXT: vrsub.vx v11, v11, a1
; CHECK-NEXT: vsetvli zero, zero, e8, mf4, ta, ma
; CHECK-NEXT: vrgatherei16.vv v12, v10, v9
; CHECK-NEXT: vmsne.vi v0, v12, 0
; CHECK-NEXT: vsetvli zero, zero, e32, m1, ta, ma
; CHECK-NEXT: vrgather.vv v9, v8, v11
; CHECK-NEXT: vsetvli zero, a2, e32, m1, ta, ma
; CHECK-NEXT: vse32.v v9, (a0), v0.t
; CHECK-NEXT: ret
%storemask = call <vscale x 2 x i1> @llvm.experimental.vp.reverse.nxv2i1(<vscale x 2 x i1> %mask, <vscale x 2 x i1> splat (i1 true), i32 %evl1)
%rev = call <vscale x 2 x float> @llvm.experimental.vp.reverse.nxv2f32(<vscale x 2 x float> %val, <vscale x 2 x i1> splat (i1 true), i32 %evl1)
call void @llvm.vp.store.nxv2f32.p0nxv2f32(<vscale x 2 x float> %rev, <vscale x 2 x float>* %ptr, <vscale x 2 x i1> %storemask, i32 %evl2)
ret void
}

declare <vscale x 2 x float> @llvm.experimental.vp.reverse.nxv2f32(<vscale x 2 x float>, <vscale x 2 x i1>, i32)
declare <vscale x 2 x i1> @llvm.experimental.vp.reverse.nxv2i1(<vscale x 2 x i1>, <vscale x 2 x i1>, i32)
declare void @llvm.vp.store.nxv2f32.p0nxv2f32(<vscale x 2 x float>, <vscale x 2 x float>* nocapture, <vscale x 2 x i1>, i32)
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