1; RUN: opt < %s  -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
2
3target 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"
4
5;CHECK-LABEL: @read_mod_write_single_ptr(
6;CHECK: load <4 x float>
7;CHECK: ret i32
8define i32 @read_mod_write_single_ptr(float* nocapture %a, i32 %n) nounwind uwtable ssp {
9  %1 = icmp sgt i32 %n, 0
10  br i1 %1, label %.lr.ph, label %._crit_edge
11
12.lr.ph:                                           ; preds = %0, %.lr.ph
13  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
14  %2 = getelementptr inbounds float, float* %a, i64 %indvars.iv
15  %3 = load float, float* %2, align 4
16  %4 = fmul float %3, 3.000000e+00
17  store float %4, float* %2, align 4
18  %indvars.iv.next = add i64 %indvars.iv, 1
19  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
20  %exitcond = icmp eq i32 %lftr.wideiv, %n
21  br i1 %exitcond, label %._crit_edge, label %.lr.ph
22
23._crit_edge:                                      ; preds = %.lr.ph, %0
24  ret i32 undef
25}
26
27; Ensure that volatile stores are not vectorized.
28; CHECK-LABEL: @read_mod_write_single_ptr_volatile_store(
29; CHECK-NOT: store <4 x float>
30; CHECK: ret i32
31define i32 @read_mod_write_single_ptr_volatile_store(float* nocapture %a, i32 %n) nounwind uwtable ssp {
32  %1 = icmp sgt i32 %n, 0
33  br i1 %1, label %.lr.ph, label %._crit_edge
34
35.lr.ph:                                           ; preds = %0, %.lr.ph
36  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
37  %2 = getelementptr inbounds float, float* %a, i64 %indvars.iv
38  %3 = load float, float* %2, align 4
39  %4 = fmul float %3, 3.000000e+00
40  store volatile float %4, float* %2, align 4
41  %indvars.iv.next = add i64 %indvars.iv, 1
42  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
43  %exitcond = icmp eq i32 %lftr.wideiv, %n
44  br i1 %exitcond, label %._crit_edge, label %.lr.ph
45
46._crit_edge:                                      ; preds = %.lr.ph, %0
47  ret i32 undef
48}
49