1; RUN: opt -basic-aa -loop-vectorize -force-vector-width=2 \ 2; RUN: -force-vector-interleave=1 -S < %s \ 3; RUN: | FileCheck %s -check-prefix=BOTH -check-prefix=LV 4; RUN: opt -basic-aa -scoped-noalias-aa -loop-vectorize -dse -force-vector-width=2 \ 5; RUN: -force-vector-interleave=1 -S < %s \ 6; RUN: | FileCheck %s -check-prefix=BOTH -check-prefix=DSE 7 8target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 9 10; This loop needs to be versioned with memchecks between {A, B} x {C} before 11; it can be vectorized. 12; 13; for (i = 0; i < n; i++) { 14; C[i] = A[i] + 1; 15; C[i] += B[i]; 16; } 17; 18; Check that the corresponding noalias metadata is added to the vector loop 19; but not to the scalar loop. 20; 21; Since in the versioned vector loop C and B can no longer alias, the first 22; store to C[i] can be DSE'd. 23 24 25define void @f(i32* %a, i32* %b, i32* %c) { 26entry: 27 br label %for.body 28 29; BOTH: vector.memcheck: 30; BOTH: vector.body: 31for.body: ; preds = %for.body, %entry 32 %ind = phi i64 [ 0, %entry ], [ %inc, %for.body ] 33 34 %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind 35; Scope 1 36; LV: = load {{.*}} !alias.scope !0 37 %loadA = load i32, i32* %arrayidxA, align 4 38 39 %add = add nuw i32 %loadA, 2 40 41 %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind 42; Noalias with scope 1 and 6 43; LV: store {{.*}} !alias.scope !3, !noalias !5 44; DSE-NOT: store 45 store i32 %add, i32* %arrayidxC, align 4 46 47 %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind 48; Scope 6 49; LV: = load {{.*}} !alias.scope !7 50 %loadB = load i32, i32* %arrayidxB, align 4 51 52 %add2 = add nuw i32 %add, %loadB 53 54; Noalias with scope 1 and 6 55; LV: store {{.*}} !alias.scope !3, !noalias !5 56; DSE: store 57 store i32 %add2, i32* %arrayidxC, align 4 58 59 %inc = add nuw nsw i64 %ind, 1 60 %exitcond = icmp eq i64 %inc, 20 61 br i1 %exitcond, label %for.end, label %for.body 62 63; BOTH: for.body: 64; BOTH-NOT: !alias.scope 65; BOTH-NOT: !noalias 66 67for.end: ; preds = %for.body 68 ret void 69} 70 71; LV: !0 = !{!1} 72; LV: !1 = distinct !{!1, !2} 73; LV: !2 = distinct !{!2, !"LVerDomain"} 74; LV: !3 = !{!4} 75; LV: !4 = distinct !{!4, !2} 76; LV: !5 = !{!1, !6} 77; LV: !6 = distinct !{!6, !2} 78; LV: !7 = !{!6} 79