1 ; Tests to make sure that loads and stores in a diamond get merged
2 ; Loads are hoisted into the header. Stores sunks into the footer.
3 ; RUN: opt -gvn-hoist -S < %s | FileCheck %s
4 target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
6 %struct.node = type { i64, %struct.node*, %struct.node*, %struct.node*, i64, %struct.arc*, i64, i64, i64 }
7 %struct.arc = type { i64, i64, i64 }
9 define i64 @foo(%struct.node* nocapture readonly %r) nounwind {
11 %node.0.in16 = getelementptr inbounds %struct.node, %struct.node* %r, i64 0, i32 2
12 %node.017 = load %struct.node*, %struct.node** %node.0.in16, align 8
13 %tobool18 = icmp eq %struct.node* %node.017, null
14 br i1 %tobool18, label %while.end, label %while.body.preheader
16 ; CHECK-LABEL: while.body.preheader
17 while.body.preheader: ; preds = %entry
21 while.body: ; preds = %while.body.preheader, %if.end
22 %node.020 = phi %struct.node* [ %node.0, %if.end ], [ %node.017, %while.body.preheader ]
23 %sum.019 = phi i64 [ %inc, %if.end ], [ 0, %while.body.preheader ]
24 %orientation = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 4
25 %0 = load i64, i64* %orientation, align 8
26 %cmp = icmp eq i64 %0, 1
27 br i1 %cmp, label %if.then, label %if.else
29 if.then: ; preds = %while.body
30 %a = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 5
31 ; CHECK-NOT: load %struct.arc
32 %1 = load %struct.arc*, %struct.arc** %a, align 8
33 %cost = getelementptr inbounds %struct.arc, %struct.arc* %1, i64 0, i32 0
34 ; CHECK-NOT: load i64, i64*
35 %2 = load i64, i64* %cost, align 8
36 %pred = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 1
37 ; CHECK-NOT: load %struct.node*, %struct.node**
38 %3 = load %struct.node*, %struct.node** %pred, align 8
39 %p = getelementptr inbounds %struct.node, %struct.node* %3, i64 0, i32 6
40 ; CHECK-NOT: load i64, i64*
41 %4 = load i64, i64* %p, align 8
42 %add = add nsw i64 %4, %2
43 %p1 = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 6
45 store i64 %add, i64* %p1, align 8
49 if.else: ; preds = %while.body
50 %pred2 = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 1
51 ; CHECK-NOT: load %struct.node*, %struct.node**
52 %5 = load %struct.node*, %struct.node** %pred2, align 8
53 %p3 = getelementptr inbounds %struct.node, %struct.node* %5, i64 0, i32 6
54 ; CHECK-NOT: load i64, i64*
55 %6 = load i64, i64* %p3, align 8
56 %a4 = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 5
57 ; CHECK-NOT: load %struct.arc*, %struct.arc**
58 %7 = load %struct.arc*, %struct.arc** %a4, align 8
59 %cost5 = getelementptr inbounds %struct.arc, %struct.arc* %7, i64 0, i32 0
60 ; CHECK-NOT: load i64, i64*
61 %8 = load i64, i64* %cost5, align 8
62 %sub = sub nsw i64 %6, %8
63 %p6 = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 6
65 store i64 %sub, i64* %p6, align 8
69 if.end: ; preds = %if.else, %if.then
71 %inc = add nsw i64 %sum.019, 1
72 %node.0.in = getelementptr inbounds %struct.node, %struct.node* %node.020, i64 0, i32 2
73 %node.0 = load %struct.node*, %struct.node** %node.0.in, align 8
74 %tobool = icmp eq %struct.node* %node.0, null
75 br i1 %tobool, label %while.end.loopexit, label %while.body
77 while.end.loopexit: ; preds = %if.end
78 %inc.lcssa = phi i64 [ %inc, %if.end ]
81 while.end: ; preds = %while.end.loopexit, %entry
82 %sum.0.lcssa = phi i64 [ 0, %entry ], [ %inc.lcssa, %while.end.loopexit ]