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
4 ; We want to make sure that we don't even try to vectorize loops again
5 ; The vectorizer used to mark the un-vectorized loop only as already vectorized
6 ; thus, trying to vectorize the vectorized loop again
8 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"
9 target triple = "x86_64-unknown-linux-gnu"
11 @a = external global [255 x i32]
13 ; Function Attrs: nounwind readonly uwtable
15 ; CHECK: LV: Checking a loop in "vect"
19 for.body: ; preds = %for.body, %entry
20 ; We need to make sure we did vectorize the loop
21 ; CHECK: LV: Found a loop: for.body
22 ; CHECK: LV: We can vectorize this loop!
23 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
24 %red.05 = phi i32 [ 0, %entry ], [ %add, %for.body ]
25 %arrayidx = getelementptr inbounds [255 x i32], [255 x i32]* @a, i64 0, i64 %indvars.iv
26 %0 = load i32, i32* %arrayidx, align 4
27 %add = add nsw i32 %0, %red.05
28 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
29 %exitcond = icmp eq i64 %indvars.iv.next, 255
30 br i1 %exitcond, label %for.end, label %for.body
32 ; If it did, we have two loops:
34 ; CHECK: br {{.*}} label %vector.body, !llvm.loop [[vect:![0-9]+]]
36 ; CHECK: br {{.*}} label %for.body{{.*}}, !llvm.loop [[scalar:![0-9]+]]
38 for.end: ; preds = %for.body
42 ; Now, we check for the Hint metadata
43 ; CHECK: [[vect]] = distinct !{[[vect]], [[width:![0-9]+]]}
44 ; CHECK: [[width]] = !{!"llvm.loop.isvectorized", i32 1}
45 ; CHECK: [[scalar]] = distinct !{[[scalar]], [[runtime_unroll:![0-9]+]], [[width]]}
46 ; CHECK: [[runtime_unroll]] = !{!"llvm.loop.unroll.runtime.disable"}