[LAA] Add tests with invariant dependences before strided ones.

Add extra test coverage for loops with strided and invariant accesses to
the same object.

1 files changed, 756 insertions, 0 deletions

diff --git a/llvm/test/Analysis/LoopAccessAnalysis/invariant-dependence-before.ll b/llvm/test/Analysis/LoopAccessAnalysis/invariant-dependence-before.ll
new file mode 100644
index 000000000000..2a210a5a445b
--- /dev/null
+++ b/llvm/test/Analysis/LoopAccessAnalysis/invariant-dependence-before.ll
@@ -0,0 +1,756 @@
+; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 3
+; RUN: opt -passes='print<access-info>' -disable-output %s 2>&1 | FileCheck %s
+
+define void @test_invar_dependence_before_positive_strided_access_1(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_before_positive_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_positive_strided_access_2(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_before_positive_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_before_positive_strided_access_1(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_positive_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 3
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_before_positive_strided_access_2(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_positive_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 3
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_positive_strided_access_1_different_access_sizes(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_before_positive_strided_access_1_different_access_sizes'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i8 %t, ptr %gep, align 1
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  %t = trunc i32 %l to i8
+  store i8 %t, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_before_positive_strided_access_1_different_access_sizes(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_positive_strided_access_1_different_access_sizes'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i64, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %t, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i64, ptr %a
+  %t = trunc i64 %l to i32
+  store i32 %t, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_negative_strided_access_1(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_before_negative_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i32, ptr %a, i32 100
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = sub i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, -100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_negative_strided_access_2(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_before_negative_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i32, ptr %a, i32 100
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = sub i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, -100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+
+define void @test_invar_dependence_not_before_negative_strided_access_1(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_negative_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i32, ptr %a, i32 99
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = sub i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, -100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_before_negative_strided_access_2(ptr %a) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_negative_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i32, ptr %a, i32 99
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = sub i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, -100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_both_invar_before_1(ptr %a) {
+; CHECK-LABEL: 'test_both_invar_before_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep.off, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep.off
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_both_invar_before_2(ptr %a) {
+; CHECK-LABEL: 'test_both_invar_before_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep.off, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %l = load i32, ptr %gep.off
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_both_invar_not_before_1(ptr %a) {
+; CHECK-LABEL: 'test_both_invar_not_before_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep.off, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 3
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep.off
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_both_invar_not_before_2(ptr %a) {
+; CHECK-LABEL: 'test_both_invar_not_before_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep.off, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 3
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %l = load i32, ptr %gep.off
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_via_loop_guard_positive_strided_access_1(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_before_via_loop_guard_positive_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 %off
+  %c = icmp sge i32 %off, 4
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_via_loop_guard_positive_strided_access_2(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_before_via_loop_guard_positive_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 %off
+  %c = icmp sge i32 %off, 4
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+define void @test_invar_dependence_not_before_via_loop_guard_positive_strided_access_1(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_via_loop_guard_positive_strided_access_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %a, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %gep, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 %off
+  %c = icmp sge i32 %off, 3
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_before_via_loop_guard_positive_strided_access_2(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_not_before_via_loop_guard_positive_strided_access_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: unsafe dependent memory operations in loop. Use #pragma clang loop distribute(enable) to allow loop distribution to attempt to isolate the offending operations into a separate loop
+; CHECK-NEXT:  Unknown data dependence.
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:        Unknown:
+; CHECK-NEXT:            %l = load i32, ptr %gep, align 4 ->
+; CHECK-NEXT:            store i32 %l, ptr %a, align 4
+; CHECK-EMPTY:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 %off
+  %c = icmp sge i32 %off, 3
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, 1
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_positive_strided_access_via_loop_guard_1(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_before_positive_strided_access_via_loop_guard_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: could not determine number of loop iterations
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  %c = icmp sge i32 %off, 0
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, %off
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_before_positive_strided_access_via_loop_guard_2(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_before_positive_strided_access_via_loop_guard_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: could not determine number of loop iterations
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  %c = icmp sge i32 %off, 0
+  br i1 %c, label %loop, label %exit
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, %off
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_known_beforepositive_strided_access_not_known_via_loop_guard_1(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_not_known_beforepositive_strided_access_not_known_via_loop_guard_1'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: could not determine number of loop iterations
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %a
+  store i32 %l, ptr %gep
+  %iv.next = add i32 %iv, %off
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}
+
+define void @test_invar_dependence_not_known_beforepositive_strided_access_not_known_via_loop_guard_2(ptr %a, i32 %off) {
+; CHECK-LABEL: 'test_invar_dependence_not_known_beforepositive_strided_access_not_known_via_loop_guard_2'
+; CHECK-NEXT:    loop:
+; CHECK-NEXT:      Report: could not determine number of loop iterations
+; CHECK-NEXT:      Dependences:
+; CHECK-NEXT:      Run-time memory checks:
+; CHECK-NEXT:      Grouped accesses:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Non vectorizable stores to invariant address were not found in loop.
+; CHECK-NEXT:      SCEV assumptions:
+; CHECK-EMPTY:
+; CHECK-NEXT:      Expressions re-written:
+;
+entry:
+  %gep.off = getelementptr i8, ptr %a, i32 4
+  br label %loop
+
+loop:
+  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
+  %gep = getelementptr i32, ptr %gep.off, i32 %iv
+  %l = load i32, ptr %gep
+  store i32 %l, ptr %a
+  %iv.next = add i32 %iv, %off
+  %ec = icmp eq i32 %iv.next, 100
+  br i1 %ec, label %exit, label %loop
+
+exit:
+  ret void
+}