1 ; RUN: opt < %s -disable-loop-unrolling -debug-only=loop-vectorize -O3 -S 2>&1 | FileCheck %s
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
7 target 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"
8 target triple = "x86_64-unknown-linux-gnu"
10 @a = external global [255 x i32]
12 ; Function Attrs: nounwind readonly uwtable
14 ; CHECK: LV: Checking a loop in "vect"
18 for.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
31 ; If it did, we have two loops:
33 ; CHECK: br {{.*}} label %vector.body, !llvm.loop [[vect:![0-9]+]]
35 ; CHECK: br {{.*}} label %for.body, !llvm.loop [[scalar:![0-9]+]]
37 for.end: ; preds = %for.body
41 ; Now, we check for the Hint metadata
42 ; CHECK: [[vect]] = distinct !{[[vect]], [[width:![0-9]+]]}
43 ; CHECK: [[width]] = !{!"llvm.loop.isvectorized", i32 1}
44 ; CHECK: [[scalar]] = distinct !{[[scalar]], [[runtime_unroll:![0-9]+]], [[width]]}
45 ; CHECK: [[runtime_unroll]] = !{!"llvm.loop.unroll.runtime.disable"}