1; REQUIRES: asserts 2; RUN: opt -loop-vectorize -mtriple=arm64-apple-iphoneos -pass-remarks-analysis=loop-vectorize -debug-only=loop-vectorize -S < %s 2>&1 | FileCheck %s 3 4; Specify a large unsafe vectorization factor of 32 that gets clamped to 16, 5; then test an even smaller VF of 2 is selected based on the cost-model. 6 7; CHECK: LV: User VF=32 is unsafe, clamping to max safe VF=16. 8; CHECK: remark: <unknown>:0:0: User-specified vectorization factor 32 is unsafe, clamping to maximum safe vectorization factor 16 9; CHECK: LV: Selecting VF: 2. 10; CHECK-LABEL: @test 11; CHECK: <2 x i64> 12define void @test(i64* nocapture %a, i64* nocapture readonly %b) { 13entry: 14 br label %loop.header 15 16loop.header: 17 %iv = phi i64 [ 0, %entry ], [ %iv.next, %latch ] 18 %arrayidx = getelementptr inbounds i64, i64* %a, i64 %iv 19 %0 = load i64, i64* %arrayidx, align 4 20 %arrayidx2 = getelementptr inbounds i64, i64* %b, i64 %iv 21 %1 = load i64, i64* %arrayidx2, align 4 22 %add = add nsw i64 %1, %0 23 %2 = add nuw nsw i64 %iv, 16 24 %arrayidx5 = getelementptr inbounds i64, i64* %a, i64 %2 25 %c = icmp eq i64 %1, 120 26 br i1 %c, label %then, label %latch 27 28then: 29 store i64 %add, i64* %arrayidx5, align 4 30 br label %latch 31 32latch: 33 %iv.next = add nuw nsw i64 %iv, 1 34 %exitcond.not = icmp eq i64 %iv.next, 1024 35 br i1 %exitcond.not, label %exit, label %loop.header, !llvm.loop !0 36 37exit: 38 ret void 39} 40 41!0 = !{!0, !1, !2} 42!1 = !{!"llvm.loop.vectorize.width", i64 32} 43!2 = !{!"llvm.loop.vectorize.enable", i1 true} 44