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[Loads] Check loop-varying pointer in isDereferenceableAndAlignedInLoop. #120962

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[Loads] Check loop-varying pointer in isDereferenceableAndAlignedInLoop. #120962

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63 changes: 38 additions & 25 deletions llvm/lib/Analysis/Loads.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,31 @@ static bool isDereferenceableAndAlignedPointer(
if (!Visited.insert(V).second)
return false;

if (CtxI) {
/// Look through assumes to see if both dereferencability and alignment can
/// be proven by an assume if needed.
RetainedKnowledge AlignRK;
RetainedKnowledge DerefRK;
bool IsAligned = V->getPointerAlignment(DL) >= Alignment;
if (getKnowledgeForValue(
V, {Attribute::Dereferenceable, Attribute::Alignment}, AC,
[&](RetainedKnowledge RK, Instruction *Assume, auto) {
if (!isValidAssumeForContext(Assume, CtxI, DT))
return false;
if (RK.AttrKind == Attribute::Alignment)
AlignRK = std::max(AlignRK, RK);
if (RK.AttrKind == Attribute::Dereferenceable)
DerefRK = std::max(DerefRK, RK);
IsAligned |= AlignRK && AlignRK.ArgValue >= Alignment.value();
if (IsAligned && DerefRK &&
DerefRK.ArgValue >= Size.getZExtValue())
return true; // We have found what we needed so we stop looking
return false; // Other assumes may have better information. so
// keep looking
}))
return true;
}

// Note that it is not safe to speculate into a malloc'd region because
// malloc may return null.

Expand Down Expand Up @@ -168,31 +193,6 @@ static bool isDereferenceableAndAlignedPointer(
Size, DL, CtxI, AC, DT, TLI,
Visited, MaxDepth);

if (CtxI) {
/// Look through assumes to see if both dereferencability and alignment can
/// be proven by an assume if needed.
RetainedKnowledge AlignRK;
RetainedKnowledge DerefRK;
bool IsAligned = V->getPointerAlignment(DL) >= Alignment;
if (getKnowledgeForValue(
V, {Attribute::Dereferenceable, Attribute::Alignment}, AC,
[&](RetainedKnowledge RK, Instruction *Assume, auto) {
if (!isValidAssumeForContext(Assume, CtxI, DT))
return false;
if (RK.AttrKind == Attribute::Alignment)
AlignRK = std::max(AlignRK, RK);
if (RK.AttrKind == Attribute::Dereferenceable)
DerefRK = std::max(DerefRK, RK);
IsAligned |= AlignRK && AlignRK.ArgValue >= Alignment.value();
if (IsAligned && DerefRK &&
DerefRK.ArgValue >= Size.getZExtValue())
return true; // We have found what we needed so we stop looking
return false; // Other assumes may have better information. so
// keep looking
}))
return true;
}

// If we don't know, assume the worst.
return false;
}
Expand Down Expand Up @@ -290,6 +290,19 @@ bool llvm::isDereferenceableAndAlignedInLoop(
return isDereferenceableAndAlignedPointer(Ptr, Alignment, EltSize, DL,
HeaderFirstNonPHI, AC, &DT);

// If the load executes in a successor of the header, check if the
// loop-varying pointer is dereferenceable and aligned at the branch in the
// header. This is stricter than necessary and we could instead look for any
// block in the loop that executes unconditionally and post-dominates the
// block with the access.
if (LI->getParent() != L->getHeader() &&
L->getExitingBlock() == L->getLoopLatch() &&
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What if the loop has multiple exiting blocks and multiple latches? (i.e. nullptr == nullptr)

What if Ptr isn't defined in the header?

isDereferenceableAndAlignedPointer(Ptr, Alignment, EltSize, DL,
L->getHeader()->getTerminator(), AC,
&DT)) {
return true;
}

// Otherwise, check to see if we have a repeating access pattern where we can
// prove that all accesses are well aligned and dereferenceable.
auto *AddRec = dyn_cast<SCEVAddRecExpr>(SE.getSCEV(Ptr));
Expand Down
101 changes: 25 additions & 76 deletions llvm/test/Transforms/LoopVectorize/dereferenceable-info-from-assumption-constant-size.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -11,8 +11,8 @@ define void @deref_assumption_in_header_constant_trip_count(ptr noalias %a, ptr
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2]] ]
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[A]], <2 x i64> [[VEC_IND]]
; CHECK-NEXT: [[TMP4:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
Expand All @@ -23,25 +23,8 @@ define void @deref_assumption_in_header_constant_trip_count(ptr noalias %a, ptr
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 0
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP7]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = icmp sge <2 x i32> [[WIDE_LOAD]], zeroinitializer
; CHECK-NEXT: [[TMP10:%.*]] = xor <2 x i1> [[TMP9]], splat (i1 true)
; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i1> [[TMP10]], i32 0
; CHECK-NEXT: br i1 [[TMP8]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]]
; CHECK: [[PRED_LOAD_IF]]:
; CHECK-NEXT: [[TMP21:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP22:%.*]] = load i32, ptr [[TMP21]], align 4
; CHECK-NEXT: [[TMP11:%.*]] = insertelement <2 x i32> poison, i32 [[TMP22]], i32 0
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]]
; CHECK: [[PRED_LOAD_CONTINUE]]:
; CHECK-NEXT: [[TMP12:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP11]], %[[PRED_LOAD_IF]] ]
; CHECK-NEXT: [[TMP13:%.*]] = extractelement <2 x i1> [[TMP10]], i32 1
; CHECK-NEXT: br i1 [[TMP13]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_IF1]]:
; CHECK-NEXT: [[TMP26:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP27:%.*]] = load i32, ptr [[TMP26]], align 4
; CHECK-NEXT: [[TMP16:%.*]] = insertelement <2 x i32> [[TMP12]], i32 [[TMP27]], i32 1
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_CONTINUE2]]:
; CHECK-NEXT: [[TMP17:%.*]] = phi <2 x i32> [ [[TMP12]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP16]], %[[PRED_LOAD_IF1]] ]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr i32, ptr [[TMP4]], i32 0
; CHECK-NEXT: [[TMP17:%.*]] = load <2 x i32>, ptr [[TMP8]], align 4
; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP9]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[TMP17]]
; CHECK-NEXT: [[TMP30:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]]
; CHECK-NEXT: [[TMP31:%.*]] = getelementptr inbounds i32, ptr [[TMP30]], i32 0
Expand Down Expand Up @@ -290,8 +273,8 @@ define void @deref_assumption_in_header_constant_trip_count_align_1(ptr noalias
; CHECK: [[VECTOR_PH]]:
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2]] ]
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[A]], <2 x i64> [[VEC_IND]]
; CHECK-NEXT: [[TMP2:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
Expand All @@ -302,25 +285,8 @@ define void @deref_assumption_in_header_constant_trip_count_align_1(ptr noalias
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i32, ptr [[TMP4]], i32 0
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP5]], align 4
; CHECK-NEXT: [[TMP6:%.*]] = icmp sge <2 x i32> [[WIDE_LOAD]], zeroinitializer
; CHECK-NEXT: [[TMP7:%.*]] = xor <2 x i1> [[TMP6]], splat (i1 true)
; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i1> [[TMP7]], i32 0
; CHECK-NEXT: br i1 [[TMP8]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]]
; CHECK: [[PRED_LOAD_IF]]:
; CHECK-NEXT: [[TMP9:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP10:%.*]] = load i32, ptr [[TMP9]], align 1
; CHECK-NEXT: [[TMP11:%.*]] = insertelement <2 x i32> poison, i32 [[TMP10]], i32 0
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]]
; CHECK: [[PRED_LOAD_CONTINUE]]:
; CHECK-NEXT: [[TMP12:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP11]], %[[PRED_LOAD_IF]] ]
; CHECK-NEXT: [[TMP13:%.*]] = extractelement <2 x i1> [[TMP7]], i32 1
; CHECK-NEXT: br i1 [[TMP13]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_IF1]]:
; CHECK-NEXT: [[TMP14:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP15:%.*]] = load i32, ptr [[TMP14]], align 1
; CHECK-NEXT: [[TMP16:%.*]] = insertelement <2 x i32> [[TMP12]], i32 [[TMP15]], i32 1
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_CONTINUE2]]:
; CHECK-NEXT: [[TMP17:%.*]] = phi <2 x i32> [ [[TMP12]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP16]], %[[PRED_LOAD_IF1]] ]
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr i32, ptr [[TMP2]], i32 0
; CHECK-NEXT: [[TMP17:%.*]] = load <2 x i32>, ptr [[TMP7]], align 1
; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP6]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[TMP17]]
; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]]
; CHECK-NEXT: [[TMP19:%.*]] = getelementptr inbounds i32, ptr [[TMP18]], i32 0
Expand Down Expand Up @@ -606,17 +572,17 @@ define void @deref_assumption_in_then_constant_trip_count(ptr noalias %a, ptr no
; CHECK-NEXT: br i1 [[TMP6]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]]
; CHECK: [[PRED_LOAD_IF]]:
; CHECK-NEXT: [[TMP17:%.*]] = extractelement <2 x ptr> [[TMP5]], i32 0
; CHECK-NEXT: [[TMP18:%.*]] = load i32, ptr [[TMP17]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP18]], i32 0
; CHECK-NEXT: [[TMP8:%.*]] = load i32, ptr [[TMP17]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP8]], i32 0
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]]
; CHECK: [[PRED_LOAD_CONTINUE]]:
; CHECK-NEXT: [[TMP10:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP9]], %[[PRED_LOAD_IF]] ]
; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[TMP4]], i32 1
; CHECK-NEXT: br i1 [[TMP11]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_IF1]]:
; CHECK-NEXT: [[TMP22:%.*]] = extractelement <2 x ptr> [[TMP5]], i32 1
; CHECK-NEXT: [[TMP23:%.*]] = load i32, ptr [[TMP22]], align 4
; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP23]], i32 1
; CHECK-NEXT: [[TMP12:%.*]] = extractelement <2 x ptr> [[TMP5]], i32 1
; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 4
; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP13]], i32 1
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_CONTINUE2]]:
; CHECK-NEXT: [[TMP15:%.*]] = phi <2 x i32> [ [[TMP10]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], %[[PRED_LOAD_IF1]] ]
Expand Down Expand Up @@ -703,24 +669,24 @@ define void @deref_assumption_in_latch_constant_trip_count(ptr noalias %a, ptr n
; CHECK-NEXT: br i1 [[TMP6]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]]
; CHECK: [[PRED_LOAD_IF]]:
; CHECK-NEXT: [[TMP17:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP18:%.*]] = load i32, ptr [[TMP17]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP18]], i32 0
; CHECK-NEXT: [[TMP8:%.*]] = load i32, ptr [[TMP17]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = insertelement <2 x i32> poison, i32 [[TMP8]], i32 0
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]]
; CHECK: [[PRED_LOAD_CONTINUE]]:
; CHECK-NEXT: [[TMP10:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP9]], %[[PRED_LOAD_IF]] ]
; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[TMP5]], i32 1
; CHECK-NEXT: br i1 [[TMP11]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_IF1]]:
; CHECK-NEXT: [[TMP22:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP23:%.*]] = load i32, ptr [[TMP22]], align 4
; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP23]], i32 1
; CHECK-NEXT: [[TMP12:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 4
; CHECK-NEXT: [[TMP14:%.*]] = insertelement <2 x i32> [[TMP10]], i32 [[TMP13]], i32 1
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_CONTINUE2]]:
; CHECK-NEXT: [[TMP15:%.*]] = phi <2 x i32> [ [[TMP10]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], %[[PRED_LOAD_IF1]] ]
; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP4]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[TMP15]]
; CHECK-NEXT: [[TMP28:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP20:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[TMP28]], i64 4), "dereferenceable"(ptr [[TMP20]], i64 4) ]
; CHECK-NEXT: [[TMP16:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP18:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[TMP16]], i64 4), "dereferenceable"(ptr [[TMP18]], i64 4) ]
; CHECK-NEXT: [[TMP29:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP19:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: call void @llvm.assume(i1 true) [ "align"(ptr [[TMP29]], i64 4), "dereferenceable"(ptr [[TMP19]], i64 4) ]
Expand Down Expand Up @@ -796,8 +762,8 @@ define void @deref_assumption_in_header_variable_trip_count(ptr noalias %a, ptr
; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[N]], [[N_MOD_VF]]
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
; CHECK: [[VECTOR_BODY]]:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2:.*]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[PRED_LOAD_CONTINUE2]] ]
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i64> [ <i64 0, i64 1>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr i32, ptr [[A]], <2 x i64> [[VEC_IND]]
; CHECK-NEXT: [[TMP4:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
Expand All @@ -808,25 +774,8 @@ define void @deref_assumption_in_header_variable_trip_count(ptr noalias %a, ptr
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[TMP6]], i32 0
; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <2 x i32>, ptr [[TMP7]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = icmp sge <2 x i32> [[WIDE_LOAD]], zeroinitializer
; CHECK-NEXT: [[TMP10:%.*]] = xor <2 x i1> [[TMP9]], splat (i1 true)
; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i1> [[TMP10]], i32 0
; CHECK-NEXT: br i1 [[TMP8]], label %[[PRED_LOAD_IF:.*]], label %[[PRED_LOAD_CONTINUE:.*]]
; CHECK: [[PRED_LOAD_IF]]:
; CHECK-NEXT: [[TMP21:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP22:%.*]] = load i32, ptr [[TMP21]], align 4
; CHECK-NEXT: [[TMP11:%.*]] = insertelement <2 x i32> poison, i32 [[TMP22]], i32 0
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE]]
; CHECK: [[PRED_LOAD_CONTINUE]]:
; CHECK-NEXT: [[TMP12:%.*]] = phi <2 x i32> [ poison, %[[VECTOR_BODY]] ], [ [[TMP11]], %[[PRED_LOAD_IF]] ]
; CHECK-NEXT: [[TMP13:%.*]] = extractelement <2 x i1> [[TMP10]], i32 1
; CHECK-NEXT: br i1 [[TMP13]], label %[[PRED_LOAD_IF1:.*]], label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_IF1]]:
; CHECK-NEXT: [[TMP26:%.*]] = extractelement <2 x ptr> [[TMP1]], i32 1
; CHECK-NEXT: [[TMP27:%.*]] = load i32, ptr [[TMP26]], align 4
; CHECK-NEXT: [[TMP16:%.*]] = insertelement <2 x i32> [[TMP12]], i32 [[TMP27]], i32 1
; CHECK-NEXT: br label %[[PRED_LOAD_CONTINUE2]]
; CHECK: [[PRED_LOAD_CONTINUE2]]:
; CHECK-NEXT: [[TMP17:%.*]] = phi <2 x i32> [ [[TMP12]], %[[PRED_LOAD_CONTINUE]] ], [ [[TMP16]], %[[PRED_LOAD_IF1]] ]
; CHECK-NEXT: [[TMP8:%.*]] = getelementptr i32, ptr [[TMP4]], i32 0
; CHECK-NEXT: [[TMP17:%.*]] = load <2 x i32>, ptr [[TMP8]], align 4
; CHECK-NEXT: [[PREDPHI:%.*]] = select <2 x i1> [[TMP9]], <2 x i32> [[WIDE_LOAD]], <2 x i32> [[TMP17]]
; CHECK-NEXT: [[TMP30:%.*]] = getelementptr inbounds i32, ptr [[C]], i64 [[TMP0]]
; CHECK-NEXT: [[TMP31:%.*]] = getelementptr inbounds i32, ptr [[TMP30]], i32 0
Expand Down
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