1; RUN: opt < %s -disable-loop-unrolling -debug-only=loop-vectorize -passes="default<O3>" -S 2>&1 | FileCheck %s 2; RUN: opt < %s -disable-loop-unrolling -debug-only=loop-vectorize -O3 -S 2>&1 | FileCheck %s 3; REQUIRES: asserts 4 5; We want to make sure that we don't even try to vectorize loops again 6; The vectorizer used to mark the un-vectorized loop only as already vectorized 7; thus, trying to vectorize the vectorized loop again 8 9target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 10target triple = "x86_64-unknown-linux-gnu" 11 12@a = external global [255 x i32] 13 14; Function Attrs: nounwind readonly uwtable 15define i32 @vect() { 16; CHECK: LV: Checking a loop in 'vect' 17entry: 18 br label %for.body 19 20for.body: ; preds = %for.body, %entry 21; We need to make sure we did vectorize the loop 22; CHECK: LV: Found a loop: for.body 23; CHECK: LV: We can vectorize this loop! 24 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 25 %red.05 = phi i32 [ 0, %entry ], [ %add, %for.body ] 26 %arrayidx = getelementptr inbounds [255 x i32], ptr @a, i64 0, i64 %indvars.iv 27 %0 = load i32, ptr %arrayidx, align 4 28 %add = add nsw i32 %0, %red.05 29 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 30 %exitcond = icmp eq i64 %indvars.iv.next, 255 31 br i1 %exitcond, label %for.end, label %for.body 32 33; If it did, we have two loops: 34; CHECK: vector.body: 35; CHECK: br {{.*}} label %vector.body, !llvm.loop [[vect:![0-9]+]] 36; CHECK: for.body: 37; CHECK: br {{.*}} label %for.body{{.*}}, !llvm.loop [[scalar:![0-9]+]] 38 39for.end: ; preds = %for.body 40 ret i32 %add 41} 42 43; Now, we check for the Hint metadata 44; CHECK: [[vect]] = distinct !{[[vect]], [[width:![0-9]+]], [[runtime_unroll:![0-9]+]]} 45; CHECK: [[width]] = !{!"llvm.loop.isvectorized", i32 1} 46; CHECK: [[runtime_unroll]] = !{!"llvm.loop.unroll.runtime.disable"} 47; CHECK: [[scalar]] = distinct !{[[scalar]], [[runtime_unroll]], [[width]]} 48