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[VPlan] Reassociate (x & y) & z -> x & (y & z) #155383

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Merged
merged 8 commits into from
Sep 3, 2025
Merged

[VPlan] Reassociate (x & y) & z -> x & (y & z) #155383

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f9f7969
Reassociate header mask
lukel97 Aug 26, 2025
2cd0bb5
Reassociate all ands
lukel97 Sep 1, 2025
94f7b9f
Restrict to multiple users
lukel97 Sep 1, 2025
28162b8
Undo stray change
lukel97 Sep 1, 2025
f66a940
Update comment
lukel97 Sep 1, 2025
7661966
Fix devastating typo
lukel97 Sep 2, 2025
7d0e1cb
Merge branch 'main' into loop-vectorize/simplify-or-and
lukel97 Sep 2, 2025
6a796d0
Merge branch 'main' into loop-vectorize/simplify-or-and
lukel97 Sep 3, 2025
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9 changes: 9 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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Expand Up @@ -1119,6 +1119,15 @@ static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
return;
}

// Reassociate (x && y) && z -> x && (y && z) if x has multiple users. With
// tail folding it is likely that x is a header mask and can be simplified
// further.
if (match(Def, m_LogicalAnd(m_LogicalAnd(m_VPValue(X), m_VPValue(Y)),
m_VPValue(Z))) &&
X->hasMoreThanOneUniqueUser())
return Def->replaceAllUsesWith(
Builder.createLogicalAnd(X, Builder.createLogicalAnd(X, Y)));
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@fhahn fhahn Sep 2, 2025

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Should this be

Suggested change
Builder.createLogicalAnd(X, Builder.createLogicalAnd(X, Y)));
Builder.createLogicalAnd(X, Builder.createLogicalAnd(Y, Z)));

?

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@lukel97 lukel97 Sep 2, 2025

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Argh, yes. Will fix and reevaluate this PR...

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@lukel97 lukel97 Sep 2, 2025

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Fixed in 7661966. I ran this again on SPEC CPU 2017 for RISC-V and there's still the original codegen improvements from the initial version of this PR where we remove the header mask in more places


if (match(Def, m_c_Mul(m_VPValue(A), m_SpecificInt(1))))
return Def->replaceAllUsesWith(A);

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66 changes: 32 additions & 34 deletions llvm/test/Transforms/LoopVectorize/AArch64/force-target-instruction-cost.ll
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Expand Up @@ -194,14 +194,11 @@ define void @test_exit_branch_cost(ptr %dst, ptr noalias %x.ptr, ptr noalias %y.
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT40:%.*]] = insertelement <2 x i1> poison, i1 [[C_3]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT41:%.*]] = shufflevector <2 x i1> [[BROADCAST_SPLATINSERT40]], <2 x i1> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT56:%.*]] = insertelement <2 x i1> poison, i1 [[C_4]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT57:%.*]] = shufflevector <2 x i1> [[BROADCAST_SPLATINSERT56]], <2 x i1> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[TMP1:%.*]] = select i1 [[C_4]], <2 x i1> [[BROADCAST_SPLAT41]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP11:%.*]] = xor <2 x i1> [[TMP1]], splat (i1 true)
; CHECK-NEXT: [[TMP33:%.*]] = xor <2 x i1> [[BROADCAST_SPLAT57]], splat (i1 true)
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_STORE_CONTINUE55:.*]] ]
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_STORE_CONTINUE53:.*]] ]
; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i64, ptr [[X_PTR]], i64 [[INDEX]]
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i64>, ptr [[TMP4]], align 8
; CHECK-NEXT: [[TMP47:%.*]] = icmp eq <2 x i64> [[WIDE_LOAD]], zeroinitializer
Expand All @@ -213,58 +210,59 @@ define void @test_exit_branch_cost(ptr %dst, ptr noalias %x.ptr, ptr noalias %y.
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE]]
; CHECK: [[PRED_STORE_CONTINUE]]:
; CHECK-NEXT: [[TMP9:%.*]] = extractelement <2 x i1> [[TMP5]], i32 1
; CHECK-NEXT: br i1 [[TMP9]], label %[[PRED_STORE_IF42:.*]], label %[[PRED_STORE_CONTINUE43:.*]]
; CHECK: [[PRED_STORE_IF42]]:
; CHECK-NEXT: br i1 [[TMP9]], label %[[PRED_STORE_IF40:.*]], label %[[PRED_STORE_CONTINUE41:.*]]
; CHECK: [[PRED_STORE_IF40]]:
; CHECK-NEXT: store i64 0, ptr [[DST_1]], align 8, !alias.scope [[META7]], !noalias [[META10]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE43]]
; CHECK: [[PRED_STORE_CONTINUE43]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE41]]
; CHECK: [[PRED_STORE_CONTINUE41]]:
; CHECK-NEXT: [[TMP13:%.*]] = select <2 x i1> [[TMP5]], <2 x i1> [[TMP11]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP16:%.*]] = extractelement <2 x i1> [[TMP13]], i32 0
; CHECK-NEXT: br i1 [[TMP16]], label %[[PRED_STORE_IF44:.*]], label %[[PRED_STORE_CONTINUE45:.*]]
; CHECK: [[PRED_STORE_IF44]]:
; CHECK-NEXT: br i1 [[TMP16]], label %[[PRED_STORE_IF42:.*]], label %[[PRED_STORE_CONTINUE43:.*]]
; CHECK: [[PRED_STORE_IF42]]:
; CHECK-NEXT: store i64 0, ptr [[DST_3]], align 8, !alias.scope [[META15:![0-9]+]], !noalias [[META16:![0-9]+]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE45]]
; CHECK: [[PRED_STORE_CONTINUE45]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE43]]
; CHECK: [[PRED_STORE_CONTINUE43]]:
; CHECK-NEXT: [[TMP17:%.*]] = extractelement <2 x i1> [[TMP13]], i32 1
; CHECK-NEXT: br i1 [[TMP17]], label %[[PRED_STORE_IF46:.*]], label %[[PRED_STORE_CONTINUE47:.*]]
; CHECK: [[PRED_STORE_IF46]]:
; CHECK-NEXT: br i1 [[TMP17]], label %[[PRED_STORE_IF44:.*]], label %[[PRED_STORE_CONTINUE45:.*]]
; CHECK: [[PRED_STORE_IF44]]:
; CHECK-NEXT: store i64 0, ptr [[DST_3]], align 8, !alias.scope [[META15]], !noalias [[META16]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE47]]
; CHECK: [[PRED_STORE_CONTINUE47]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE45]]
; CHECK: [[PRED_STORE_CONTINUE45]]:
; CHECK-NEXT: [[TMP19:%.*]] = select <2 x i1> [[TMP5]], <2 x i1> [[BROADCAST_SPLAT41]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP21:%.*]] = select <2 x i1> [[TMP19]], <2 x i1> [[BROADCAST_SPLAT57]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP21:%.*]] = select <2 x i1> [[TMP5]], <2 x i1> [[TMP19]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP23:%.*]] = or <2 x i1> [[TMP47]], [[TMP21]]
; CHECK-NEXT: [[PREDPHI58:%.*]] = select <2 x i1> [[TMP21]], <2 x i64> zeroinitializer, <2 x i64> splat (i64 1)
; CHECK-NEXT: [[TMP28:%.*]] = extractelement <2 x i1> [[TMP23]], i32 0
; CHECK-NEXT: br i1 [[TMP28]], label %[[PRED_STORE_IF48:.*]], label %[[PRED_STORE_CONTINUE49:.*]]
; CHECK: [[PRED_STORE_IF48]]:
; CHECK-NEXT: br i1 [[TMP28]], label %[[PRED_STORE_IF46:.*]], label %[[PRED_STORE_CONTINUE47:.*]]
; CHECK: [[PRED_STORE_IF46]]:
; CHECK-NEXT: [[TMP29:%.*]] = extractelement <2 x i64> [[PREDPHI58]], i32 0
; CHECK-NEXT: store i64 [[TMP29]], ptr [[DST_2]], align 8, !alias.scope [[META17:![0-9]+]], !noalias [[META18:![0-9]+]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE49]]
; CHECK: [[PRED_STORE_CONTINUE49]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE47]]
; CHECK: [[PRED_STORE_CONTINUE47]]:
; CHECK-NEXT: [[TMP30:%.*]] = extractelement <2 x i1> [[TMP23]], i32 1
; CHECK-NEXT: br i1 [[TMP30]], label %[[PRED_STORE_IF50:.*]], label %[[PRED_STORE_CONTINUE51:.*]]
; CHECK: [[PRED_STORE_IF50]]:
; CHECK-NEXT: br i1 [[TMP30]], label %[[PRED_STORE_IF48:.*]], label %[[PRED_STORE_CONTINUE49:.*]]
; CHECK: [[PRED_STORE_IF48]]:
; CHECK-NEXT: [[TMP31:%.*]] = extractelement <2 x i64> [[PREDPHI58]], i32 1
; CHECK-NEXT: store i64 [[TMP31]], ptr [[DST_2]], align 8, !alias.scope [[META17]], !noalias [[META18]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE51]]
; CHECK: [[PRED_STORE_CONTINUE51]]:
; CHECK-NEXT: [[TMP35:%.*]] = select <2 x i1> [[TMP19]], <2 x i1> [[TMP33]], <2 x i1> zeroinitializer
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE49]]
; CHECK: [[PRED_STORE_CONTINUE49]]:
; CHECK-NEXT: [[TMP18:%.*]] = select <2 x i1> [[TMP5]], <2 x i1> [[BROADCAST_SPLAT41]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP35:%.*]] = select <2 x i1> [[TMP5]], <2 x i1> [[TMP18]], <2 x i1> zeroinitializer
; CHECK-NEXT: [[TMP37:%.*]] = or <2 x i1> [[TMP23]], [[TMP35]]
; CHECK-NEXT: [[TMP42:%.*]] = extractelement <2 x i1> [[TMP37]], i32 0
; CHECK-NEXT: br i1 [[TMP42]], label %[[PRED_STORE_IF52:.*]], label %[[PRED_STORE_CONTINUE53:.*]]
; CHECK: [[PRED_STORE_IF52]]:
; CHECK-NEXT: br i1 [[TMP42]], label %[[PRED_STORE_IF50:.*]], label %[[PRED_STORE_CONTINUE51:.*]]
; CHECK: [[PRED_STORE_IF50]]:
; CHECK-NEXT: [[TMP22:%.*]] = load i64, ptr [[SRC]], align 8, !alias.scope [[META19:![0-9]+]]
; CHECK-NEXT: store i64 [[TMP22]], ptr [[DST]], align 8, !alias.scope [[META20:![0-9]+]], !noalias [[META19]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE53]]
; CHECK: [[PRED_STORE_CONTINUE53]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE51]]
; CHECK: [[PRED_STORE_CONTINUE51]]:
; CHECK-NEXT: [[TMP44:%.*]] = extractelement <2 x i1> [[TMP37]], i32 1
; CHECK-NEXT: br i1 [[TMP44]], label %[[PRED_STORE_IF54:.*]], label %[[PRED_STORE_CONTINUE55]]
; CHECK: [[PRED_STORE_IF54]]:
; CHECK-NEXT: br i1 [[TMP44]], label %[[PRED_STORE_IF52:.*]], label %[[PRED_STORE_CONTINUE53]]
; CHECK: [[PRED_STORE_IF52]]:
; CHECK-NEXT: [[TMP24:%.*]] = load i64, ptr [[SRC]], align 8, !alias.scope [[META19]]
; CHECK-NEXT: store i64 [[TMP24]], ptr [[DST]], align 8, !alias.scope [[META20]], !noalias [[META19]]
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE55]]
; CHECK: [[PRED_STORE_CONTINUE55]]:
; CHECK-NEXT: br label %[[PRED_STORE_CONTINUE53]]
; CHECK: [[PRED_STORE_CONTINUE53]]:
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 2
; CHECK-NEXT: [[TMP46:%.*]] = icmp eq i64 [[INDEX_NEXT]], 64
; CHECK-NEXT: br i1 [[TMP46]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP21:![0-9]+]]
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9 changes: 2 additions & 7 deletions llvm/test/Transforms/LoopVectorize/RISCV/blocks-with-dead-instructions.ll
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Expand Up @@ -425,9 +425,6 @@ define void @multiple_blocks_with_dead_inst_multiple_successors_6(ptr %src, i1 %
; CHECK-NEXT: [[TMP2:%.*]] = add nuw nsw i64 [[TMP1]], 1
; CHECK-NEXT: br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 8 x i1> poison, i1 [[IC]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 8 x i1> [[BROADCAST_SPLATINSERT]], <vscale x 8 x i1> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[TMP8:%.*]] = xor <vscale x 8 x i1> [[BROADCAST_SPLAT]], splat (i1 true)
; CHECK-NEXT: [[TMP11:%.*]] = call <vscale x 8 x i64> @llvm.stepvector.nxv8i64()
; CHECK-NEXT: [[TMP13:%.*]] = mul <vscale x 8 x i64> [[TMP11]], splat (i64 3)
; CHECK-NEXT: [[INDUCTION:%.*]] = add <vscale x 8 x i64> zeroinitializer, [[TMP13]]
Expand All @@ -448,11 +445,9 @@ define void @multiple_blocks_with_dead_inst_multiple_successors_6(ptr %src, i1 %
; CHECK-NEXT: [[WIDE_MASKED_GATHER:%.*]] = call <vscale x 8 x i16> @llvm.vp.gather.nxv8i16.nxv8p0(<vscale x 8 x ptr> align 2 [[TMP20]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP27]])
; CHECK-NEXT: [[TMP17:%.*]] = icmp eq <vscale x 8 x i16> [[WIDE_MASKED_GATHER]], zeroinitializer
; CHECK-NEXT: [[TMP18:%.*]] = select <vscale x 8 x i1> [[TMP15]], <vscale x 8 x i1> [[TMP17]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP19:%.*]] = select <vscale x 8 x i1> [[TMP18]], <vscale x 8 x i1> [[TMP8]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP28:%.*]] = xor <vscale x 8 x i1> [[TMP17]], splat (i1 true)
; CHECK-NEXT: [[TMP21:%.*]] = select <vscale x 8 x i1> [[TMP15]], <vscale x 8 x i1> [[TMP28]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP22:%.*]] = or <vscale x 8 x i1> [[TMP19]], [[TMP21]]
; CHECK-NEXT: [[TMP23:%.*]] = select <vscale x 8 x i1> [[TMP18]], <vscale x 8 x i1> [[BROADCAST_SPLAT]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP22:%.*]] = or <vscale x 8 x i1> [[TMP18]], [[TMP28]]
; CHECK-NEXT: [[TMP23:%.*]] = select <vscale x 8 x i1> [[TMP15]], <vscale x 8 x i1> [[TMP17]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP24:%.*]] = or <vscale x 8 x i1> [[TMP22]], [[TMP23]]
; CHECK-NEXT: call void @llvm.vp.scatter.nxv8i16.nxv8p0(<vscale x 8 x i16> zeroinitializer, <vscale x 8 x ptr> align 2 [[TMP20]], <vscale x 8 x i1> [[TMP24]], i32 [[TMP27]])
; CHECK-NEXT: [[TMP25:%.*]] = zext i32 [[TMP27]] to i64
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22 changes: 7 additions & 15 deletions ...t/Transforms/LoopVectorize/RISCV/pr87378-vpinstruction-or-drop-poison-generating-flags.ll
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Expand Up @@ -12,11 +12,7 @@ define void @pr87378_vpinstruction_or_drop_poison_generating_flags(ptr %arg, i64
; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
; CHECK: vector.ph:
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <vscale x 8 x i64> poison, i64 [[A]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <vscale x 8 x i64> [[BROADCAST_SPLATINSERT]], <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT1:%.*]] = insertelement <vscale x 8 x i64> poison, i64 [[B]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 8 x i64> [[BROADCAST_SPLATINSERT1]], <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 8 x i64> poison, i64 [[C]], i64 0
; CHECK-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 8 x i64> [[BROADCAST_SPLATINSERT3]], <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[BROADCAST_SPLAT2:%.*]] = shufflevector <vscale x 8 x i64> [[BROADCAST_SPLATINSERT]], <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[TMP6:%.*]] = call <vscale x 8 x i64> @llvm.stepvector.nxv8i64()
; CHECK-NEXT: [[TMP7:%.*]] = mul <vscale x 8 x i64> [[TMP6]], splat (i64 1)
; CHECK-NEXT: [[INDUCTION:%.*]] = add <vscale x 8 x i64> zeroinitializer, [[TMP7]]
Expand All @@ -33,18 +29,14 @@ define void @pr87378_vpinstruction_or_drop_poison_generating_flags(ptr %arg, i64
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <vscale x 8 x i64> [[BROADCAST_SPLATINSERT5]], <vscale x 8 x i64> poison, <vscale x 8 x i32> zeroinitializer
; CHECK-NEXT: [[TMP10:%.*]] = call <vscale x 8 x i32> @llvm.stepvector.nxv8i32()
; CHECK-NEXT: [[TMP11:%.*]] = icmp ult <vscale x 8 x i32> [[TMP10]], [[BROADCAST_SPLAT8]]
; CHECK-NEXT: [[TMP13:%.*]] = icmp ule <vscale x 8 x i64> [[VEC_IND]], [[BROADCAST_SPLAT]]
; CHECK-NEXT: [[TMP28:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP13]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP14:%.*]] = icmp ule <vscale x 8 x i64> [[VEC_IND]], [[BROADCAST_SPLAT2]]
; CHECK-NEXT: [[TMP15:%.*]] = select <vscale x 8 x i1> [[TMP28]], <vscale x 8 x i1> [[TMP14]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP16:%.*]] = xor <vscale x 8 x i1> [[TMP13]], splat (i1 true)
; CHECK-NEXT: [[TMP29:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP16]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP15:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP14]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP29:%.*]] = xor <vscale x 8 x i1> [[TMP14]], splat (i1 true)
; CHECK-NEXT: [[TMP17:%.*]] = or <vscale x 8 x i1> [[TMP15]], [[TMP29]]
; CHECK-NEXT: [[TMP18:%.*]] = icmp ule <vscale x 8 x i64> [[VEC_IND]], [[BROADCAST_SPLAT4]]
; CHECK-NEXT: [[TMP19:%.*]] = select <vscale x 8 x i1> [[TMP17]], <vscale x 8 x i1> [[TMP18]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP20:%.*]] = xor <vscale x 8 x i1> [[TMP14]], splat (i1 true)
; CHECK-NEXT: [[TMP21:%.*]] = select <vscale x 8 x i1> [[TMP28]], <vscale x 8 x i1> [[TMP20]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP22:%.*]] = or <vscale x 8 x i1> [[TMP19]], [[TMP21]]
; CHECK-NEXT: [[TMP13:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP14]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP21:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP13]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP12:%.*]] = or <vscale x 8 x i1> [[TMP17]], [[TMP14]]
; CHECK-NEXT: [[TMP22:%.*]] = select <vscale x 8 x i1> [[TMP11]], <vscale x 8 x i1> [[TMP12]], <vscale x 8 x i1> zeroinitializer
; CHECK-NEXT: [[TMP23:%.*]] = extractelement <vscale x 8 x i1> [[TMP21]], i32 0
; CHECK-NEXT: [[PREDPHI:%.*]] = select i1 [[TMP23]], i64 poison, i64 [[INDEX]]
; CHECK-NEXT: [[TMP24:%.*]] = getelementptr i16, ptr [[ARG]], i64 [[PREDPHI]]
Expand Down
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