1; Test that MergeConsecutiveStores() does not during DAG combining
2; incorrectly drop a chain dependency to a store previously chained to
3; one of two combined loads.
4;
5; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
6
7@A = common global [2048 x float] zeroinitializer, align 4
8
9; Function Attrs: nounwind
10define signext i32 @main(i32 signext %argc, i8** nocapture readnone %argv) #0 {
11entry:
12  br label %for.body
13
14for.body:                                         ; preds = %for.body, %entry
15  %indvars.iv24 = phi i64 [ 0, %entry ], [ %indvars.iv.next25, %for.body ]
16  %sum.018 = phi float [ 0.000000e+00, %entry ], [ %add, %for.body ]
17  %0 = trunc i64 %indvars.iv24 to i32
18  %conv = sitofp i32 %0 to float
19  %arrayidx = getelementptr inbounds [2048 x float], [2048 x float]* @A, i64 0, i64 %indvars.iv24
20  store float %conv, float* %arrayidx, align 4
21  %add = fadd float %sum.018, %conv
22  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
23  %exitcond26 = icmp eq i64 %indvars.iv.next25, 2048
24  br i1 %exitcond26, label %for.end, label %for.body
25
26for.end:                                          ; preds = %for.body
27  br label %for.body.3.lr.ph.i.preheader
28
29for.body.3.lr.ph.i.preheader:                     ; preds = %complex_transpose.exit, %for.end
30  %i.116 = phi i32 [ 0, %for.end ], [ %inc9, %complex_transpose.exit ]
31  br label %for.body.3.lr.ph.i
32
33for.body.3.lr.ph.i:                               ; preds = %for.body.3.lr.ph.i.preheader, %for.inc.40.i
34  %indvars.iv19 = phi i32 [ 1, %for.body.3.lr.ph.i.preheader ], [ %indvars.iv.next20, %for.inc.40.i ]
35  %indvars.iv57.i = phi i64 [ 1, %for.body.3.lr.ph.i.preheader ], [ %indvars.iv.next58.i, %for.inc.40.i ]
36  %1 = shl nsw i64 %indvars.iv57.i, 1
37  %2 = shl nsw i64 %indvars.iv57.i, 6
38  br label %for.body.3.i
39
40for.body.3.i:                                     ; preds = %for.body.3.i, %for.body.3.lr.ph.i
41; CHECK-LABEL: .LBB0_5:
42; CHECK-NOT:    stfh    %r{{.*}}, 0(%r{{.*}})
43; CHECK:        lg      %r{{.*}}, 8(%r{{.*}})
44; Overlapping load should go before the store
45  %indvars.iv.i = phi i64 [ 0, %for.body.3.lr.ph.i ], [ %indvars.iv.next.i, %for.body.3.i ]
46  %3 = shl nsw i64 %indvars.iv.i, 6
47  %4 = add nuw nsw i64 %3, %1
48  %arrayidx.i = getelementptr inbounds [2048 x float], [2048 x float]* @A, i64 0, i64 %4
49  %5 = bitcast float* %arrayidx.i to i32*
50  %6 = load i32, i32* %5, align 4
51  %arrayidx9.i = getelementptr inbounds float, float* getelementptr inbounds ([2048 x float], [2048 x float]* @A, i64 0, i64 1), i64 %4
52  %7 = bitcast float* %arrayidx9.i to i32*
53  %8 = load i32, i32* %7, align 4
54  %9 = shl nsw i64 %indvars.iv.i, 1
55  %10 = add nuw nsw i64 %9, %2
56  %arrayidx14.i = getelementptr inbounds [2048 x float], [2048 x float]* @A, i64 0, i64 %10
57  %11 = bitcast float* %arrayidx14.i to i32*
58  %12 = load i32, i32* %11, align 4
59  %arrayidx19.i = getelementptr inbounds float, float* getelementptr inbounds ([2048 x float], [2048 x float]* @A, i64 0, i64 1), i64 %10
60  %13 = bitcast float* %arrayidx19.i to i32*
61  %14 = load i32, i32* %13, align 4
62  store i32 %6, i32* %11, align 4
63  store i32 %8, i32* %13, align 4
64  store i32 %12, i32* %5, align 4
65  store i32 %14, i32* %7, align 4
66  %indvars.iv.next.i = add nuw nsw i64 %indvars.iv.i, 1
67  %lftr.wideiv = trunc i64 %indvars.iv.next.i to i32
68  %exitcond21 = icmp eq i32 %lftr.wideiv, %indvars.iv19
69  br i1 %exitcond21, label %for.inc.40.i, label %for.body.3.i
70
71for.inc.40.i:                                     ; preds = %for.body.3.i
72  %indvars.iv.next58.i = add nuw nsw i64 %indvars.iv57.i, 1
73  %indvars.iv.next20 = add nuw nsw i32 %indvars.iv19, 1
74  %exitcond22 = icmp eq i64 %indvars.iv.next58.i, 32
75  br i1 %exitcond22, label %complex_transpose.exit, label %for.body.3.lr.ph.i
76
77complex_transpose.exit:                           ; preds = %for.inc.40.i
78  %inc9 = add nuw nsw i32 %i.116, 1
79  %exitcond23 = icmp eq i32 %inc9, 10
80  br i1 %exitcond23, label %for.body.14.preheader, label %for.body.3.lr.ph.i.preheader
81
82for.body.14.preheader:                            ; preds = %complex_transpose.exit
83  br label %for.body.14
84
85for.body.14:                                      ; preds = %for.body.14.preheader, %for.body.14
86  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body.14 ], [ 0, %for.body.14.preheader ]
87  %sum.115 = phi float [ %add17, %for.body.14 ], [ 0.000000e+00, %for.body.14.preheader ]
88  %arrayidx16 = getelementptr inbounds [2048 x float], [2048 x float]* @A, i64 0, i64 %indvars.iv
89  %15 = load float, float* %arrayidx16, align 4
90  %add17 = fadd float %sum.115, %15
91  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
92  %exitcond = icmp eq i64 %indvars.iv.next, 2048
93  br i1 %exitcond, label %for.end.20, label %for.body.14
94
95for.end.20:                                       ; preds = %for.body.14
96  ret i32 0
97}
98