1; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-interleave=1 -S < %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@A = common global [1024 x float] zeroinitializer, align 16
6@B = common global [1024 x float] zeroinitializer, align 16
7
8; Make sure we can vectorize in the presence of hoistable conditional loads.
9; CHECK-LABEL: @hoist_cond_load(
10; CHECK: load <2 x float>
11
12define void @hoist_cond_load() {
13entry:
14  br label %for.body
15for.body:
16  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]
17  %arrayidx = getelementptr inbounds [1024 x float], [1024 x float]* @A, i64 0, i64 %indvars.iv
18  %arrayidx2 = getelementptr inbounds [1024 x float], [1024 x float]* @B, i64 0, i64 %indvars.iv
19  %0 = load float, float* %arrayidx2, align 4
20  %cmp3 = fcmp oeq float %0, 0.000000e+00
21  br i1 %cmp3, label %if.end9, label %if.else
22
23if.else:
24  %1 = load float, float* %arrayidx, align 4
25  br label %if.end9
26
27if.end9:
28  %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]
29  store float %tmp.0, float* %arrayidx, align 4
30  %indvars.iv.next = add i64 %indvars.iv, 1
31  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
32  %exitcond = icmp ne i32 %lftr.wideiv, 1024
33  br i1 %exitcond, label %for.body, label %for.end
34
35for.end:
36  ret void
37}
38
39; However, we can't hoist loads whose address we have not seen unconditionally
40; accessed.
41; CHECK-LABEL: @dont_hoist_cond_load(
42; CHECK-NOT: load <2 x float>
43
44define void @dont_hoist_cond_load() {
45entry:
46  br label %for.body
47for.body:
48  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]
49  %arrayidx = getelementptr inbounds [1024 x float], [1024 x float]* @A, i64 0, i64 %indvars.iv
50  %arrayidx2 = getelementptr inbounds [1024 x float], [1024 x float]* @B, i64 0, i64 %indvars.iv
51  %0 = load float, float* %arrayidx2, align 4
52  %cmp3 = fcmp oeq float %0, 0.000000e+00
53  br i1 %cmp3, label %if.end9, label %if.else
54
55if.else:
56  %1 = load float, float* %arrayidx, align 4
57  br label %if.end9
58
59if.end9:
60  %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]
61  store float %tmp.0, float* %arrayidx2, align 4
62  %indvars.iv.next = add i64 %indvars.iv, 1
63  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
64  %exitcond = icmp ne i32 %lftr.wideiv, 1024
65  br i1 %exitcond, label %for.body, label %for.end
66
67for.end:
68  ret void
69}
70