1; RUN: opt < %s -loop-rotate -S | FileCheck %s
2; RUN: opt < %s -loop-rotate -enable-mssa-loop-dependency=true -verify-memoryssa -S | FileCheck %s
3
4target 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"
5
6; Ensure that "llvm.loop.vectorize.enable" metadata was not lost after loop-rotate.
7; In past LoopRotate was clearing that metadata.
8;
9; See http://reviews.llvm.org/D3348 for details.
10
11; CHECK-LABEL: @foo
12; CHECK: loop_cond:
13; CHECK-NOT: loop-inc
14; CHECK: br i1 %cmp, label %return, label %loop_cond, !llvm.loop !0
15; CHECK: !0 = distinct !{!0, !1}
16; CHECK: !1 = !{!"llvm.loop.vectorize.enable", i1 true}
17define i32 @foo(i32 %a) {
18entry:
19  br label %loop_cond
20
21loop_cond:
22  %indx = phi i32 [ 1, %entry ], [ %inc, %loop_inc ]
23  %cmp = icmp ne i32 %indx, %a
24  br i1 %cmp, label %return, label %loop_inc
25
26loop_inc:
27  %inc = add i32 %indx, 1
28  br label %loop_cond, !llvm.loop !0
29
30return:
31  ret i32 0
32}
33
34!0 = !{!0, !1}
35!1 = !{!"llvm.loop.vectorize.enable", i1 true}
36