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