1; RUN: opt < %s -gvn -S | FileCheck %s
2
3target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
4target triple = "i386-apple-darwin7"
5
6define i32 @test1(i32* %b, i32* %c) nounwind {
7; CHECK-LABEL: @test1(
8entry:
9	%g = alloca i32
10	%t1 = icmp eq i32* %b, null
11	br i1 %t1, label %bb, label %bb1
12
13bb:
14	%t2 = load i32* %c, align 4
15	%t3 = add i32 %t2, 1
16	store i32 %t3, i32* %g, align 4
17	br label %bb2
18
19bb1:		; preds = %entry
20	%t5 = load i32* %b, align 4
21	%t6 = add i32 %t5, 1
22	store i32 %t6, i32* %g, align 4
23	br label %bb2
24
25bb2:		; preds = %bb1, %bb
26	%c_addr.0 = phi i32* [ %g, %bb1 ], [ %c, %bb ]
27	%b_addr.0 = phi i32* [ %b, %bb1 ], [ %g, %bb ]
28	%cv = load i32* %c_addr.0, align 4
29	%bv = load i32* %b_addr.0, align 4
30; CHECK: %bv = phi i32
31; CHECK: %cv = phi i32
32; CHECK-NOT: load
33; CHECK: ret i32
34	%ret = add i32 %cv, %bv
35	ret i32 %ret
36}
37
38define i8 @test2(i1 %cond, i32* %b, i32* %c) nounwind {
39; CHECK-LABEL: @test2(
40entry:
41  br i1 %cond, label %bb, label %bb1
42
43bb:
44  %b1 = bitcast i32* %b to i8*
45  store i8 4, i8* %b1
46  br label %bb2
47
48bb1:
49  %c1 = bitcast i32* %c to i8*
50  store i8 92, i8* %c1
51  br label %bb2
52
53bb2:
54  %d = phi i32* [ %c, %bb1 ], [ %b, %bb ]
55  %d1 = bitcast i32* %d to i8*
56  %dv = load i8* %d1
57; CHECK: %dv = phi i8 [ 92, %bb1 ], [ 4, %bb ]
58; CHECK-NOT: load
59; CHECK: ret i8 %dv
60  ret i8 %dv
61}
62
63define i32 @test3(i1 %cond, i32* %b, i32* %c) nounwind {
64; CHECK-LABEL: @test3(
65entry:
66  br i1 %cond, label %bb, label %bb1
67
68bb:
69  %b1 = getelementptr i32* %b, i32 17
70  store i32 4, i32* %b1
71  br label %bb2
72
73bb1:
74  %c1 = getelementptr i32* %c, i32 7
75  store i32 82, i32* %c1
76  br label %bb2
77
78bb2:
79  %d = phi i32* [ %c, %bb1 ], [ %b, %bb ]
80  %i = phi i32 [ 7, %bb1 ], [ 17, %bb ]
81  %d1 = getelementptr i32* %d, i32 %i
82  %dv = load i32* %d1
83; CHECK: %dv = phi i32 [ 82, %bb1 ], [ 4, %bb ]
84; CHECK-NOT: load
85; CHECK: ret i32 %dv
86  ret i32 %dv
87}
88
89; PR5313
90define i32 @test4(i1 %cond, i32* %b, i32* %c) nounwind {
91; CHECK-LABEL: @test4(
92entry:
93  br i1 %cond, label %bb, label %bb1
94
95bb:
96  store i32 4, i32* %b
97  br label %bb2
98
99bb1:
100  %c1 = getelementptr i32* %c, i32 7
101  store i32 82, i32* %c1
102  br label %bb2
103
104bb2:
105  %d = phi i32* [ %c, %bb1 ], [ %b, %bb ]
106  %i = phi i32 [ 7, %bb1 ], [ 0, %bb ]
107  %d1 = getelementptr i32* %d, i32 %i
108  %dv = load i32* %d1
109; CHECK: %dv = phi i32 [ 82, %bb1 ], [ 4, %bb ]
110; CHECK-NOT: load
111; CHECK: ret i32 %dv
112  ret i32 %dv
113}
114
115
116
117; void test5(int N, double* G) {
118;   for (long j = 1; j < 1000; j++)
119;     G[j] = G[j] + G[j-1];
120; }
121;
122; Should compile into one load in the loop.
123define void @test5(i32 %N, double* nocapture %G) nounwind ssp {
124; CHECK-LABEL: @test5(
125bb.nph:
126  br label %for.body
127
128for.body:
129  %indvar = phi i64 [ 0, %bb.nph ], [ %tmp, %for.body ]
130  %arrayidx6 = getelementptr double* %G, i64 %indvar
131  %tmp = add i64 %indvar, 1
132  %arrayidx = getelementptr double* %G, i64 %tmp
133  %tmp3 = load double* %arrayidx
134  %tmp7 = load double* %arrayidx6
135  %add = fadd double %tmp3, %tmp7
136  store double %add, double* %arrayidx
137  %exitcond = icmp eq i64 %tmp, 999
138  br i1 %exitcond, label %for.end, label %for.body
139; CHECK: for.body:
140; CHECK: phi double
141; CHECK: load double
142; CHECK-NOT: load double
143; CHECK: br i1
144for.end:
145  ret void
146}
147