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[VPlan] Drop poison-generating flags on induction trunc #168922

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Nov 21, 2025
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[VPlan] Drop poison-generating flags on induction trunc #168922

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1128a72
[LV] Pre-commit test for #168902
artagnon Nov 20, 2025
55b1eb7
[VPlan] Drop poison-generating flags on induction trunc
artagnon Nov 20, 2025
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2 changes: 2 additions & 0 deletions llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
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Expand Up @@ -3326,6 +3326,8 @@ expandVPWidenIntOrFpInduction(VPWidenIntOrFpInductionRecipe *WidenIVR,
assert(StepTy->isIntegerTy() && "Truncation requires an integer type");
Step = Builder.createScalarCast(Instruction::Trunc, Step, Ty, DL);
Start = Builder.createScalarCast(Instruction::Trunc, Start, Ty, DL);
// Truncation doesn't preserve WrapFlags.
Flags.dropPoisonGeneratingFlags();
Comment on lines +3329 to +3330
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@fhahn fhahn Nov 21, 2025

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We may be improve the results, if the trunc itself has nuw/nsw.

StepTy = Ty;
}

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6 changes: 3 additions & 3 deletions llvm/test/Transforms/LoopVectorize/AArch64/epilog-vectorization-widen-inductions.ll
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Expand Up @@ -410,7 +410,7 @@ define void @test_widen_truncated_induction(ptr %A) {
; CHECK-NEXT: store <2 x i8> [[VEC_IND]], ptr [[TMP1]], align 1
; CHECK-NEXT: store <2 x i8> [[STEP_ADD]], ptr [[TMP3]], align 1
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <2 x i8> [[STEP_ADD]], splat (i8 2)
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <2 x i8> [[STEP_ADD]], splat (i8 2)
; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 10000
; CHECK-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK: middle.block:
Expand All @@ -422,15 +422,15 @@ define void @test_widen_truncated_induction(ptr %A) {
; CHECK-NEXT: [[TMP5:%.*]] = trunc i64 [[VEC_EPILOG_RESUME_VAL]] to i8
; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i8> poison, i8 [[TMP5]], i64 0
; CHECK-NEXT: [[DOTSPLAT:%.*]] = shufflevector <2 x i8> [[DOTSPLATINSERT]], <2 x i8> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[INDUCTION:%.*]] = add nuw nsw <2 x i8> [[DOTSPLAT]], <i8 0, i8 1>
; CHECK-NEXT: [[INDUCTION:%.*]] = add <2 x i8> [[DOTSPLAT]], <i8 0, i8 1>
; CHECK-NEXT: br label [[VEC_EPILOG_VECTOR_BODY:%.*]]
; CHECK: vec.epilog.vector.body:
; CHECK-NEXT: [[INDEX2:%.*]] = phi i64 [ [[VEC_EPILOG_RESUME_VAL]], [[VEC_EPILOG_PH]] ], [ [[INDEX_NEXT5:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND3:%.*]] = phi <2 x i8> [ [[INDUCTION]], [[VEC_EPILOG_PH]] ], [ [[VEC_IND_NEXT4:%.*]], [[VEC_EPILOG_VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i8, ptr [[A]], i64 [[INDEX2]]
; CHECK-NEXT: store <2 x i8> [[VEC_IND3]], ptr [[TMP7]], align 1
; CHECK-NEXT: [[INDEX_NEXT5]] = add nuw i64 [[INDEX2]], 2
; CHECK-NEXT: [[VEC_IND_NEXT4]] = add nuw nsw <2 x i8> [[VEC_IND3]], splat (i8 2)
; CHECK-NEXT: [[VEC_IND_NEXT4]] = add <2 x i8> [[VEC_IND3]], splat (i8 2)
; CHECK-NEXT: [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT5]], 10000
; CHECK-NEXT: br i1 [[TMP9]], label [[VEC_EPILOG_MIDDLE_BLOCK:%.*]], label [[VEC_EPILOG_VECTOR_BODY]], {{!llvm.loop ![0-9]+}}
; CHECK: vec.epilog.middle.block:
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20 changes: 10 additions & 10 deletions llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll
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Expand Up @@ -353,7 +353,7 @@ define void @tail_predicate_without_optsize(ptr %p, i8 %a, i8 %b, i8 %c, i32 %n)
; DEFAULT: [[PRED_STORE_CONTINUE35]]:
; DEFAULT-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 16
; DEFAULT-NEXT: [[VEC_IND_NEXT]] = add <16 x i8> [[VEC_IND]], splat (i8 16)
; DEFAULT-NEXT: [[VEC_IND_NEXT36]] = add nuw nsw <16 x i8> [[VEC_IND1]], splat (i8 16)
; DEFAULT-NEXT: [[VEC_IND_NEXT36]] = add <16 x i8> [[VEC_IND1]], splat (i8 16)
; DEFAULT-NEXT: br i1 true, label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
; DEFAULT: [[MIDDLE_BLOCK]]:
; DEFAULT-NEXT: br label %[[FOR_COND_CLEANUP:.*]]
Expand Down Expand Up @@ -454,8 +454,8 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; DEFAULT-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[C]], i64 0
; DEFAULT-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 16 x i8> [[BROADCAST_SPLATINSERT3]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
; DEFAULT-NEXT: [[TMP10:%.*]] = call <vscale x 16 x i8> @llvm.stepvector.nxv16i8()
; DEFAULT-NEXT: [[TMP11:%.*]] = mul nuw nsw <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; DEFAULT-NEXT: [[INDUCTION:%.*]] = add nuw nsw <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; DEFAULT-NEXT: [[TMP11:%.*]] = mul <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; DEFAULT-NEXT: [[INDUCTION:%.*]] = add <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; DEFAULT-NEXT: [[TMP12:%.*]] = trunc i64 [[TMP1]] to i8
; DEFAULT-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[TMP12]], i64 0
; DEFAULT-NEXT: [[DOTSPLAT:%.*]] = shufflevector <vscale x 16 x i8> [[DOTSPLATINSERT]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
Expand All @@ -477,7 +477,7 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; DEFAULT-NEXT: [[ACTIVE_LANE_MASK_NEXT]] = call <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i64(i64 [[INDEX]], i64 [[TMP9]])
; DEFAULT-NEXT: [[TMP24:%.*]] = extractelement <vscale x 16 x i1> [[ACTIVE_LANE_MASK_NEXT]], i32 0
; DEFAULT-NEXT: [[TMP23:%.*]] = xor i1 [[TMP24]], true
; DEFAULT-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; DEFAULT-NEXT: [[VEC_IND_NEXT]] = add <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; DEFAULT-NEXT: br i1 [[TMP23]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
; DEFAULT: [[MIDDLE_BLOCK]]:
; DEFAULT-NEXT: br label %[[FOR_COND_CLEANUP:.*]]
Expand All @@ -504,8 +504,8 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; OPTSIZE-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[C]], i64 0
; OPTSIZE-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 16 x i8> [[BROADCAST_SPLATINSERT3]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
; OPTSIZE-NEXT: [[TMP10:%.*]] = call <vscale x 16 x i8> @llvm.stepvector.nxv16i8()
; OPTSIZE-NEXT: [[TMP11:%.*]] = mul nuw nsw <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; OPTSIZE-NEXT: [[INDUCTION:%.*]] = add nuw nsw <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; OPTSIZE-NEXT: [[TMP11:%.*]] = mul <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; OPTSIZE-NEXT: [[INDUCTION:%.*]] = add <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; OPTSIZE-NEXT: [[TMP12:%.*]] = trunc i64 [[TMP1]] to i8
; OPTSIZE-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[TMP12]], i64 0
; OPTSIZE-NEXT: [[DOTSPLAT:%.*]] = shufflevector <vscale x 16 x i8> [[DOTSPLATINSERT]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
Expand All @@ -527,7 +527,7 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; OPTSIZE-NEXT: [[ACTIVE_LANE_MASK_NEXT]] = call <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i64(i64 [[INDEX]], i64 [[TMP9]])
; OPTSIZE-NEXT: [[TMP24:%.*]] = extractelement <vscale x 16 x i1> [[ACTIVE_LANE_MASK_NEXT]], i32 0
; OPTSIZE-NEXT: [[TMP23:%.*]] = xor i1 [[TMP24]], true
; OPTSIZE-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; OPTSIZE-NEXT: [[VEC_IND_NEXT]] = add <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; OPTSIZE-NEXT: br i1 [[TMP23]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; OPTSIZE: [[MIDDLE_BLOCK]]:
; OPTSIZE-NEXT: br label %[[FOR_COND_CLEANUP:.*]]
Expand All @@ -554,8 +554,8 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; MINSIZE-NEXT: [[BROADCAST_SPLATINSERT3:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[C]], i64 0
; MINSIZE-NEXT: [[BROADCAST_SPLAT4:%.*]] = shufflevector <vscale x 16 x i8> [[BROADCAST_SPLATINSERT3]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
; MINSIZE-NEXT: [[TMP10:%.*]] = call <vscale x 16 x i8> @llvm.stepvector.nxv16i8()
; MINSIZE-NEXT: [[TMP11:%.*]] = mul nuw nsw <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; MINSIZE-NEXT: [[INDUCTION:%.*]] = add nuw nsw <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; MINSIZE-NEXT: [[TMP11:%.*]] = mul <vscale x 16 x i8> [[TMP10]], splat (i8 1)
; MINSIZE-NEXT: [[INDUCTION:%.*]] = add <vscale x 16 x i8> zeroinitializer, [[TMP11]]
; MINSIZE-NEXT: [[TMP12:%.*]] = trunc i64 [[TMP1]] to i8
; MINSIZE-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <vscale x 16 x i8> poison, i8 [[TMP12]], i64 0
; MINSIZE-NEXT: [[DOTSPLAT:%.*]] = shufflevector <vscale x 16 x i8> [[DOTSPLATINSERT]], <vscale x 16 x i8> poison, <vscale x 16 x i32> zeroinitializer
Expand All @@ -577,7 +577,7 @@ define void @sve_tail_predicate_without_minsize(ptr %p, i8 %a, i8 %b, i8 %c, i32
; MINSIZE-NEXT: [[ACTIVE_LANE_MASK_NEXT]] = call <vscale x 16 x i1> @llvm.get.active.lane.mask.nxv16i1.i64(i64 [[INDEX]], i64 [[TMP9]])
; MINSIZE-NEXT: [[TMP24:%.*]] = extractelement <vscale x 16 x i1> [[ACTIVE_LANE_MASK_NEXT]], i32 0
; MINSIZE-NEXT: [[TMP23:%.*]] = xor i1 [[TMP24]], true
; MINSIZE-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; MINSIZE-NEXT: [[VEC_IND_NEXT]] = add <vscale x 16 x i8> [[VEC_IND]], [[DOTSPLAT]]
; MINSIZE-NEXT: br i1 [[TMP23]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; MINSIZE: [[MIDDLE_BLOCK]]:
; MINSIZE-NEXT: br label %[[FOR_COND_CLEANUP:.*]]
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4 changes: 2 additions & 2 deletions llvm/test/Transforms/LoopVectorize/AArch64/streaming-compatible-sve-no-maximize-bandwidth.ll
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Expand Up @@ -43,7 +43,7 @@ define i32 @foo(i32 noundef %n, i32 noundef %lag, i32 noundef %shift) vscale_ran
; SC_SVE-NEXT: [[TMP16:%.*]] = shl <4 x i32> [[TMP15]], [[BROADCAST_SPLAT]]
; SC_SVE-NEXT: [[TMP17]] = add <4 x i32> [[TMP16]], [[VEC_PHI]]
; SC_SVE-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; SC_SVE-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <4 x i32> [[VEC_IND]], splat (i32 4)
; SC_SVE-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
; SC_SVE-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; SC_SVE-NEXT: br i1 [[TMP18]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; SC_SVE: middle.block:
Expand Down Expand Up @@ -114,7 +114,7 @@ define i32 @foo(i32 noundef %n, i32 noundef %lag, i32 noundef %shift) vscale_ran
; NO_SC_SVE-NEXT: [[TMP16:%.*]] = shl <8 x i32> [[TMP15]], [[BROADCAST_SPLAT]]
; NO_SC_SVE-NEXT: [[TMP17]] = add <8 x i32> [[TMP16]], [[VEC_PHI]]
; NO_SC_SVE-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
; NO_SC_SVE-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <8 x i32> [[VEC_IND]], splat (i32 8)
; NO_SC_SVE-NEXT: [[VEC_IND_NEXT]] = add <8 x i32> [[VEC_IND]], splat (i32 8)
; NO_SC_SVE-NEXT: [[TMP18:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; NO_SC_SVE-NEXT: br i1 [[TMP18]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; NO_SC_SVE: middle.block:
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/Transforms/LoopVectorize/AArch64/sve-interleaved-accesses.ll
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Expand Up @@ -391,7 +391,7 @@ define void @test_reversed_load2_store2(ptr noalias nocapture readonly %A, ptr n
; CHECK-NEXT: [[INTERLEAVED_VEC:%.*]] = call <vscale x 8 x i32> @llvm.vector.interleave2.nxv8i32(<vscale x 4 x i32> [[REVERSE2]], <vscale x 4 x i32> [[REVERSE3]])
; CHECK-NEXT: store <vscale x 8 x i32> [[INTERLEAVED_VEC]], ptr [[TMP19]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add nsw <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[TMP20:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP20]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
; CHECK: middle.block:
Expand Down Expand Up @@ -1590,7 +1590,7 @@ define void @interleave_deinterleave_reverse(ptr noalias nocapture readonly %A,
; CHECK-NEXT: [[INTERLEAVED_VEC11:%.*]] = call <vscale x 16 x i32> @llvm.vector.interleave4.nxv16i32(<vscale x 4 x i32> [[REVERSE6]], <vscale x 4 x i32> [[REVERSE7]], <vscale x 4 x i32> [[REVERSE8]], <vscale x 4 x i32> [[REVERSE9]])
; CHECK-NEXT: store <vscale x 16 x i32> [[INTERLEAVED_VEC11]], ptr [[TMP26]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP1]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add nsw <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[TMP27:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
; CHECK-NEXT: br i1 [[TMP27]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP45:![0-9]+]]
; CHECK: middle.block:
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/Transforms/LoopVectorize/AArch64/sve2-histcnt-too-many-deps.ll
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Expand Up @@ -90,7 +90,7 @@ define void @many_deps(ptr noalias %buckets, ptr %array, ptr %indices, ptr %othe
; NORMAL_DEP_LIMIT-NEXT: [[TMP15:%.*]] = add <vscale x 4 x i32> [[WIDE_LOAD10]], [[VEC_IND]]
; NORMAL_DEP_LIMIT-NEXT: store <vscale x 4 x i32> [[TMP15]], ptr [[TMP14]], align 4, !alias.scope [[META7]], !noalias [[META0]]
; NORMAL_DEP_LIMIT-NEXT: [[IV_NEXT]] = add nuw i64 [[IV]], [[TMP8]]
; NORMAL_DEP_LIMIT-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; NORMAL_DEP_LIMIT-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; NORMAL_DEP_LIMIT-NEXT: [[TMP16:%.*]] = icmp eq i64 [[IV_NEXT]], [[N_VEC]]
; NORMAL_DEP_LIMIT-NEXT: br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[FOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]]
; NORMAL_DEP_LIMIT: middle.block:
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/Transforms/LoopVectorize/AArch64/sve2-histcnt.ll
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Expand Up @@ -625,7 +625,7 @@ define void @simple_histogram_rtdepcheck(ptr noalias %buckets, ptr %array, ptr %
; CHECK-NEXT: [[TMP15:%.*]] = getelementptr inbounds i32, ptr [[ARRAY]], i64 [[INDEX]]
; CHECK-NEXT: store <vscale x 4 x i32> [[VEC_IND]], ptr [[TMP15]], align 4
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], [[TMP8]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add nuw nsw <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <vscale x 4 x i32> [[VEC_IND]], [[DOTSPLAT]]
; CHECK-NEXT: [[TMP16:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP16]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP21:![0-9]+]]
; CHECK: middle.block:
Expand Down
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