[LV] Add test cases for global struct dereferencability.

Currently LLVM fails to determine that conditional loads in
@accesses_to_struct_dereferenceable are dereferenceable unconditionally.

diff --git a/llvm/test/Transforms/LoopVectorize/load-of-struct-deref-pred.ll b/llvm/test/Transforms/LoopVectorize/load-of-struct-deref-pred.ll
new file mode 100644 (file)
index 0000000..527f981
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/load-of-struct-deref-pred.ll
@@ -0,0 +1,380 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
+; RUN: opt -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+%struct.Foo = type { [32000 x i32], [32000 x i32] }
+
+@foo = global %struct.Foo zeroinitializer, align 4
+
+define void @accesses_to_struct_dereferenceable(ptr noalias %dst) {
+; CHECK-LABEL: define void @accesses_to_struct_dereferenceable
+; CHECK-SAME: (ptr noalias [[DST:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_LOAD_CONTINUE6:%.*]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP2]], align 4
+; CHECK-NEXT:    [[TMP3:%.*]] = icmp ult <4 x i32> [[WIDE_LOAD]], zeroinitializer
+; CHECK-NEXT:    [[TMP4:%.*]] = xor <4 x i1> [[TMP3]], <i1 true, i1 true, i1 true, i1 true>
+; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <4 x i1> [[TMP4]], i32 0
+; CHECK-NEXT:    br i1 [[TMP5]], label [[PRED_LOAD_IF:%.*]], label [[PRED_LOAD_CONTINUE:%.*]]
+; CHECK:       pred.load.if:
+; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds [[STRUCT_FOO:%.*]], ptr @foo, i64 0, i32 1, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP7:%.*]] = load i32, ptr [[TMP6]], align 4
+; CHECK-NEXT:    [[TMP8:%.*]] = insertelement <4 x i32> poison, i32 [[TMP7]], i32 0
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE]]
+; CHECK:       pred.load.continue:
+; CHECK-NEXT:    [[TMP9:%.*]] = phi <4 x i32> [ poison, [[VECTOR_BODY]] ], [ [[TMP8]], [[PRED_LOAD_IF]] ]
+; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i1> [[TMP4]], i32 1
+; CHECK-NEXT:    br i1 [[TMP10]], label [[PRED_LOAD_IF1:%.*]], label [[PRED_LOAD_CONTINUE2:%.*]]
+; CHECK:       pred.load.if1:
+; CHECK-NEXT:    [[TMP11:%.*]] = add i64 [[INDEX]], 1
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP11]]
+; CHECK-NEXT:    [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 4
+; CHECK-NEXT:    [[TMP14:%.*]] = insertelement <4 x i32> [[TMP9]], i32 [[TMP13]], i32 1
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE2]]
+; CHECK:       pred.load.continue2:
+; CHECK-NEXT:    [[TMP15:%.*]] = phi <4 x i32> [ [[TMP9]], [[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], [[PRED_LOAD_IF1]] ]
+; CHECK-NEXT:    [[TMP16:%.*]] = extractelement <4 x i1> [[TMP4]], i32 2
+; CHECK-NEXT:    br i1 [[TMP16]], label [[PRED_LOAD_IF3:%.*]], label [[PRED_LOAD_CONTINUE4:%.*]]
+; CHECK:       pred.load.if3:
+; CHECK-NEXT:    [[TMP17:%.*]] = add i64 [[INDEX]], 2
+; CHECK-NEXT:    [[TMP18:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP17]]
+; CHECK-NEXT:    [[TMP19:%.*]] = load i32, ptr [[TMP18]], align 4
+; CHECK-NEXT:    [[TMP20:%.*]] = insertelement <4 x i32> [[TMP15]], i32 [[TMP19]], i32 2
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE4]]
+; CHECK:       pred.load.continue4:
+; CHECK-NEXT:    [[TMP21:%.*]] = phi <4 x i32> [ [[TMP15]], [[PRED_LOAD_CONTINUE2]] ], [ [[TMP20]], [[PRED_LOAD_IF3]] ]
+; CHECK-NEXT:    [[TMP22:%.*]] = extractelement <4 x i1> [[TMP4]], i32 3
+; CHECK-NEXT:    br i1 [[TMP22]], label [[PRED_LOAD_IF5:%.*]], label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.if5:
+; CHECK-NEXT:    [[TMP23:%.*]] = add i64 [[INDEX]], 3
+; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP23]]
+; CHECK-NEXT:    [[TMP25:%.*]] = load i32, ptr [[TMP24]], align 4
+; CHECK-NEXT:    [[TMP26:%.*]] = insertelement <4 x i32> [[TMP21]], i32 [[TMP25]], i32 3
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.continue6:
+; CHECK-NEXT:    [[TMP27:%.*]] = phi <4 x i32> [ [[TMP21]], [[PRED_LOAD_CONTINUE4]] ], [ [[TMP26]], [[PRED_LOAD_IF5]] ]
+; CHECK-NEXT:    [[TMP28:%.*]] = getelementptr [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP29:%.*]] = getelementptr i32, ptr [[TMP28]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i32>, ptr [[TMP29]], align 4
+; CHECK-NEXT:    [[PREDPHI:%.*]] = select <4 x i1> [[TMP4]], <4 x i32> [[TMP27]], <4 x i32> [[WIDE_LOAD7]]
+; CHECK-NEXT:    [[TMP30:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    store <4 x i32> [[PREDPHI]], ptr [[TMP30]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[TMP31:%.*]] = icmp eq i64 [[INDEX_NEXT]], 32000
+; CHECK-NEXT:    br i1 [[TMP31]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 32000, 32000
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; CHECK:       scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 32000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[IV]]
+; CHECK-NEXT:    [[D:%.*]] = load i32, ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i32 [[D]], 0
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[IV]]
+; CHECK-NEXT:    [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 4
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       if.else:
+; CHECK-NEXT:    [[GEP_B:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[IV]]
+; CHECK-NEXT:    [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 4
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    [[TMP_0:%.*]] = phi i32 [ [[L_A]], [[IF_THEN]] ], [ [[L_B]], [[IF_ELSE]] ]
+; CHECK-NEXT:    store i32 [[TMP_0]], ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 32000
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[LOOP_HEADER]], !llvm.loop [[LOOP3:![0-9]+]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
+  %gep.dst = getelementptr inbounds i32, ptr %dst, i64 %iv
+  %d = load i32, ptr %gep.dst, align 4
+  %cmp3 = icmp ult i32 %d, 0
+  br i1 %cmp3, label %if.then, label %if.else
+
+if.then:
+  %gep.a = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 0, i64 %iv
+  %l.a = load i32, ptr %gep.a, align 4
+  br label %loop.latch
+
+if.else:
+  %gep.b = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 1, i64 %iv
+  %l.b = load i32, ptr %gep.b, align 4
+  br label %loop.latch
+
+loop.latch:
+  %tmp.0 = phi i32 [ %l.a, %if.then ], [ %l.b, %if.else ]
+  store i32 %tmp.0, ptr %gep.dst, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 32000
+  br i1 %exitcond.not, label %exit, label %loop.header
+
+exit:
+  ret void
+}
+
+define void @accesses_to_struct_may_not_be_dereferenceable_due_to_loop_bound(ptr noalias %dst) {
+; CHECK-LABEL: define void @accesses_to_struct_may_not_be_dereferenceable_due_to_loop_bound
+; CHECK-SAME: (ptr noalias [[DST:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_LOAD_CONTINUE6:%.*]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP2]], align 4
+; CHECK-NEXT:    [[TMP3:%.*]] = icmp ult <4 x i32> [[WIDE_LOAD]], zeroinitializer
+; CHECK-NEXT:    [[TMP4:%.*]] = xor <4 x i1> [[TMP3]], <i1 true, i1 true, i1 true, i1 true>
+; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <4 x i1> [[TMP4]], i32 0
+; CHECK-NEXT:    br i1 [[TMP5]], label [[PRED_LOAD_IF:%.*]], label [[PRED_LOAD_CONTINUE:%.*]]
+; CHECK:       pred.load.if:
+; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds [[STRUCT_FOO:%.*]], ptr @foo, i64 0, i32 1, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP7:%.*]] = load i32, ptr [[TMP6]], align 4
+; CHECK-NEXT:    [[TMP8:%.*]] = insertelement <4 x i32> poison, i32 [[TMP7]], i32 0
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE]]
+; CHECK:       pred.load.continue:
+; CHECK-NEXT:    [[TMP9:%.*]] = phi <4 x i32> [ poison, [[VECTOR_BODY]] ], [ [[TMP8]], [[PRED_LOAD_IF]] ]
+; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i1> [[TMP4]], i32 1
+; CHECK-NEXT:    br i1 [[TMP10]], label [[PRED_LOAD_IF1:%.*]], label [[PRED_LOAD_CONTINUE2:%.*]]
+; CHECK:       pred.load.if1:
+; CHECK-NEXT:    [[TMP11:%.*]] = add i64 [[INDEX]], 1
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP11]]
+; CHECK-NEXT:    [[TMP13:%.*]] = load i32, ptr [[TMP12]], align 4
+; CHECK-NEXT:    [[TMP14:%.*]] = insertelement <4 x i32> [[TMP9]], i32 [[TMP13]], i32 1
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE2]]
+; CHECK:       pred.load.continue2:
+; CHECK-NEXT:    [[TMP15:%.*]] = phi <4 x i32> [ [[TMP9]], [[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], [[PRED_LOAD_IF1]] ]
+; CHECK-NEXT:    [[TMP16:%.*]] = extractelement <4 x i1> [[TMP4]], i32 2
+; CHECK-NEXT:    br i1 [[TMP16]], label [[PRED_LOAD_IF3:%.*]], label [[PRED_LOAD_CONTINUE4:%.*]]
+; CHECK:       pred.load.if3:
+; CHECK-NEXT:    [[TMP17:%.*]] = add i64 [[INDEX]], 2
+; CHECK-NEXT:    [[TMP18:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP17]]
+; CHECK-NEXT:    [[TMP19:%.*]] = load i32, ptr [[TMP18]], align 4
+; CHECK-NEXT:    [[TMP20:%.*]] = insertelement <4 x i32> [[TMP15]], i32 [[TMP19]], i32 2
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE4]]
+; CHECK:       pred.load.continue4:
+; CHECK-NEXT:    [[TMP21:%.*]] = phi <4 x i32> [ [[TMP15]], [[PRED_LOAD_CONTINUE2]] ], [ [[TMP20]], [[PRED_LOAD_IF3]] ]
+; CHECK-NEXT:    [[TMP22:%.*]] = extractelement <4 x i1> [[TMP4]], i32 3
+; CHECK-NEXT:    br i1 [[TMP22]], label [[PRED_LOAD_IF5:%.*]], label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.if5:
+; CHECK-NEXT:    [[TMP23:%.*]] = add i64 [[INDEX]], 3
+; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP23]]
+; CHECK-NEXT:    [[TMP25:%.*]] = load i32, ptr [[TMP24]], align 4
+; CHECK-NEXT:    [[TMP26:%.*]] = insertelement <4 x i32> [[TMP21]], i32 [[TMP25]], i32 3
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.continue6:
+; CHECK-NEXT:    [[TMP27:%.*]] = phi <4 x i32> [ [[TMP21]], [[PRED_LOAD_CONTINUE4]] ], [ [[TMP26]], [[PRED_LOAD_IF5]] ]
+; CHECK-NEXT:    [[TMP28:%.*]] = getelementptr [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP29:%.*]] = getelementptr i32, ptr [[TMP28]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i32>, ptr [[TMP29]], align 4
+; CHECK-NEXT:    [[PREDPHI:%.*]] = select <4 x i1> [[TMP4]], <4 x i32> [[TMP27]], <4 x i32> [[WIDE_LOAD7]]
+; CHECK-NEXT:    [[TMP30:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    store <4 x i32> [[PREDPHI]], ptr [[TMP30]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[TMP31:%.*]] = icmp eq i64 [[INDEX_NEXT]], 32000
+; CHECK-NEXT:    br i1 [[TMP31]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 32001, 32000
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; CHECK:       scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 32000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[IV]]
+; CHECK-NEXT:    [[D:%.*]] = load i32, ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i32 [[D]], 0
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[IV]]
+; CHECK-NEXT:    [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 4
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       if.else:
+; CHECK-NEXT:    [[GEP_B:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[IV]]
+; CHECK-NEXT:    [[L_B:%.*]] = load i32, ptr [[GEP_B]], align 4
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    [[TMP_0:%.*]] = phi i32 [ [[L_A]], [[IF_THEN]] ], [ [[L_B]], [[IF_ELSE]] ]
+; CHECK-NEXT:    store i32 [[TMP_0]], ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 32001
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[LOOP_HEADER]], !llvm.loop [[LOOP5:![0-9]+]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
+  %gep.dst = getelementptr inbounds i32, ptr %dst, i64 %iv
+  %d = load i32, ptr %gep.dst, align 4
+  %cmp3 = icmp ult i32 %d, 0
+  br i1 %cmp3, label %if.then, label %if.else
+
+if.then:
+  %gep.a = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 0, i64 %iv
+  %l.a = load i32, ptr %gep.a, align 4
+  br label %loop.latch
+
+if.else:
+  %gep.b = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 1, i64 %iv
+  %l.b = load i32, ptr %gep.b, align 4
+  br label %loop.latch
+
+loop.latch:
+  %tmp.0 = phi i32 [ %l.a, %if.then ], [ %l.b, %if.else ]
+  store i32 %tmp.0, ptr %gep.dst, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 32001
+  br i1 %exitcond.not, label %exit, label %loop.header
+
+exit:
+  ret void
+}
+
+define void @accesses_to_struct_may_not_be_dereferenceable_access_size(ptr noalias %dst) {
+; CHECK-LABEL: define void @accesses_to_struct_may_not_be_dereferenceable_access_size
+; CHECK-SAME: (ptr noalias [[DST:%.*]]) {
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
+; CHECK:       vector.ph:
+; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
+; CHECK:       vector.body:
+; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_LOAD_CONTINUE6:%.*]] ]
+; CHECK-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP2]], align 4
+; CHECK-NEXT:    [[TMP3:%.*]] = icmp ult <4 x i32> [[WIDE_LOAD]], zeroinitializer
+; CHECK-NEXT:    [[TMP4:%.*]] = xor <4 x i1> [[TMP3]], <i1 true, i1 true, i1 true, i1 true>
+; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <4 x i1> [[TMP4]], i32 0
+; CHECK-NEXT:    br i1 [[TMP5]], label [[PRED_LOAD_IF:%.*]], label [[PRED_LOAD_CONTINUE:%.*]]
+; CHECK:       pred.load.if:
+; CHECK-NEXT:    [[TMP6:%.*]] = getelementptr inbounds [[STRUCT_FOO:%.*]], ptr @foo, i64 0, i32 1, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP7:%.*]] = load i64, ptr [[TMP6]], align 4
+; CHECK-NEXT:    [[TMP8:%.*]] = insertelement <4 x i64> poison, i64 [[TMP7]], i32 0
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE]]
+; CHECK:       pred.load.continue:
+; CHECK-NEXT:    [[TMP9:%.*]] = phi <4 x i64> [ poison, [[VECTOR_BODY]] ], [ [[TMP8]], [[PRED_LOAD_IF]] ]
+; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i1> [[TMP4]], i32 1
+; CHECK-NEXT:    br i1 [[TMP10]], label [[PRED_LOAD_IF1:%.*]], label [[PRED_LOAD_CONTINUE2:%.*]]
+; CHECK:       pred.load.if1:
+; CHECK-NEXT:    [[TMP11:%.*]] = add i64 [[INDEX]], 1
+; CHECK-NEXT:    [[TMP12:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP11]]
+; CHECK-NEXT:    [[TMP13:%.*]] = load i64, ptr [[TMP12]], align 4
+; CHECK-NEXT:    [[TMP14:%.*]] = insertelement <4 x i64> [[TMP9]], i64 [[TMP13]], i32 1
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE2]]
+; CHECK:       pred.load.continue2:
+; CHECK-NEXT:    [[TMP15:%.*]] = phi <4 x i64> [ [[TMP9]], [[PRED_LOAD_CONTINUE]] ], [ [[TMP14]], [[PRED_LOAD_IF1]] ]
+; CHECK-NEXT:    [[TMP16:%.*]] = extractelement <4 x i1> [[TMP4]], i32 2
+; CHECK-NEXT:    br i1 [[TMP16]], label [[PRED_LOAD_IF3:%.*]], label [[PRED_LOAD_CONTINUE4:%.*]]
+; CHECK:       pred.load.if3:
+; CHECK-NEXT:    [[TMP17:%.*]] = add i64 [[INDEX]], 2
+; CHECK-NEXT:    [[TMP18:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP17]]
+; CHECK-NEXT:    [[TMP19:%.*]] = load i64, ptr [[TMP18]], align 4
+; CHECK-NEXT:    [[TMP20:%.*]] = insertelement <4 x i64> [[TMP15]], i64 [[TMP19]], i32 2
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE4]]
+; CHECK:       pred.load.continue4:
+; CHECK-NEXT:    [[TMP21:%.*]] = phi <4 x i64> [ [[TMP15]], [[PRED_LOAD_CONTINUE2]] ], [ [[TMP20]], [[PRED_LOAD_IF3]] ]
+; CHECK-NEXT:    [[TMP22:%.*]] = extractelement <4 x i1> [[TMP4]], i32 3
+; CHECK-NEXT:    br i1 [[TMP22]], label [[PRED_LOAD_IF5:%.*]], label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.if5:
+; CHECK-NEXT:    [[TMP23:%.*]] = add i64 [[INDEX]], 3
+; CHECK-NEXT:    [[TMP24:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[TMP23]]
+; CHECK-NEXT:    [[TMP25:%.*]] = load i64, ptr [[TMP24]], align 4
+; CHECK-NEXT:    [[TMP26:%.*]] = insertelement <4 x i64> [[TMP21]], i64 [[TMP25]], i32 3
+; CHECK-NEXT:    br label [[PRED_LOAD_CONTINUE6]]
+; CHECK:       pred.load.continue6:
+; CHECK-NEXT:    [[TMP27:%.*]] = phi <4 x i64> [ [[TMP21]], [[PRED_LOAD_CONTINUE4]] ], [ [[TMP26]], [[PRED_LOAD_IF5]] ]
+; CHECK-NEXT:    [[TMP28:%.*]] = trunc <4 x i64> [[TMP27]] to <4 x i32>
+; CHECK-NEXT:    [[TMP29:%.*]] = getelementptr [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[TMP0]]
+; CHECK-NEXT:    [[TMP30:%.*]] = getelementptr i32, ptr [[TMP29]], i32 0
+; CHECK-NEXT:    [[WIDE_LOAD7:%.*]] = load <4 x i32>, ptr [[TMP30]], align 4
+; CHECK-NEXT:    [[PREDPHI:%.*]] = select <4 x i1> [[TMP4]], <4 x i32> [[TMP28]], <4 x i32> [[WIDE_LOAD7]]
+; CHECK-NEXT:    [[TMP31:%.*]] = getelementptr inbounds i32, ptr [[TMP1]], i32 0
+; CHECK-NEXT:    store <4 x i32> [[PREDPHI]], ptr [[TMP31]], align 4
+; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
+; CHECK-NEXT:    [[TMP32:%.*]] = icmp eq i64 [[INDEX_NEXT]], 32000
+; CHECK-NEXT:    br i1 [[TMP32]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]]
+; CHECK:       middle.block:
+; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i64 32000, 32000
+; CHECK-NEXT:    br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]]
+; CHECK:       scalar.ph:
+; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ 32000, [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY:%.*]] ]
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[GEP_DST:%.*]] = getelementptr inbounds i32, ptr [[DST]], i64 [[IV]]
+; CHECK-NEXT:    [[D:%.*]] = load i32, ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[CMP3:%.*]] = icmp ult i32 [[D]], 0
+; CHECK-NEXT:    br i1 [[CMP3]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[GEP_A:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 0, i64 [[IV]]
+; CHECK-NEXT:    [[L_A:%.*]] = load i32, ptr [[GEP_A]], align 4
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       if.else:
+; CHECK-NEXT:    [[GEP_B:%.*]] = getelementptr inbounds [[STRUCT_FOO]], ptr @foo, i64 0, i32 1, i64 [[IV]]
+; CHECK-NEXT:    [[L_B:%.*]] = load i64, ptr [[GEP_B]], align 4
+; CHECK-NEXT:    [[T:%.*]] = trunc i64 [[L_B]] to i32
+; CHECK-NEXT:    br label [[LOOP_LATCH]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    [[TMP_0:%.*]] = phi i32 [ [[L_A]], [[IF_THEN]] ], [ [[T]], [[IF_ELSE]] ]
+; CHECK-NEXT:    store i32 [[TMP_0]], ptr [[GEP_DST]], align 4
+; CHECK-NEXT:    [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 32000
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[EXIT]], label [[LOOP_HEADER]], !llvm.loop [[LOOP7:![0-9]+]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %loop.header
+
+loop.header:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop.latch ]
+  %gep.dst = getelementptr inbounds i32, ptr %dst, i64 %iv
+  %d = load i32, ptr %gep.dst, align 4
+  %cmp3 = icmp ult i32 %d, 0
+  br i1 %cmp3, label %if.then, label %if.else
+
+if.then:
+  %gep.a = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 0, i64 %iv
+  %l.a = load i32, ptr %gep.a, align 4
+  br label %loop.latch
+
+if.else:
+  %gep.b = getelementptr inbounds %struct.Foo, ptr @foo, i64 0, i32 1, i64 %iv
+  %l.b = load i64, ptr %gep.b, align 4
+  %t = trunc i64 %l.b to i32
+  br label %loop.latch
+
+loop.latch:
+  %tmp.0 = phi i32 [ %l.a, %if.then ], [ %t, %if.else ]
+  store i32 %tmp.0, ptr %gep.dst, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond.not = icmp eq i64 %iv.next, 32000
+  br i1 %exitcond.not, label %exit, label %loop.header
+
+exit:
+  ret void
+}