1; RUN: opt < %s -simplifycfg -phi-node-folding-threshold=2 -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"
4target triple = "x86_64-unknown-linux-gnu"
5
6define i32 @test1(i32 %a, i32 %b, i32 %c) nounwind  {
7; CHECK-LABEL: @test1(
8entry:
9        %tmp1 = icmp eq i32 %b, 0
10        br i1 %tmp1, label %bb1, label %bb3
11
12bb1:            ; preds = %entry
13	%tmp2 = icmp sgt i32 %c, 1
14	br i1 %tmp2, label %bb2, label %bb3
15; CHECK: bb1:
16; CHECK-NEXT: icmp sgt i32 %c, 1
17; CHECK-NEXT: add i32 %a, 1
18; CHECK-NEXT: select i1 %tmp2, i32 %tmp3, i32 %a
19; CHECK-NEXT: br label %bb3
20
21bb2:		; preds = bb1
22	%tmp3 = add i32 %a, 1
23	br label %bb3
24
25bb3:		; preds = %bb2, %entry
26	%tmp4 = phi i32 [ %b, %entry ], [ %a, %bb1 ], [ %tmp3, %bb2 ]
27        %tmp5 = sub i32 %tmp4, 1
28	ret i32 %tmp5
29}
30
31define i8* @test4(i1* %dummy, i8* %a, i8* %b) {
32; Test that we don't speculate an arbitrarily large number of unfolded constant
33; expressions.
34; CHECK-LABEL: @test4(
35
36entry:
37  %cond1 = load volatile i1, i1* %dummy
38  br i1 %cond1, label %if, label %end
39
40if:
41  %cond2 = load volatile i1, i1* %dummy
42  br i1 %cond2, label %then, label %end
43
44then:
45  br label %end
46
47end:
48  %x1 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 1 to i8*), %then ]
49  %x2 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 2 to i8*), %then ]
50  %x3 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 3 to i8*), %then ]
51  %x4 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 4 to i8*), %then ]
52  %x5 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 5 to i8*), %then ]
53  %x6 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 6 to i8*), %then ]
54  %x7 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 7 to i8*), %then ]
55  %x8 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 8 to i8*), %then ]
56  %x9 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 9 to i8*), %then ]
57  %x10 = phi i8* [ %a, %entry ], [ %b, %if ], [ inttoptr (i64 10 to i8*), %then ]
58; CHECK-NOT: select
59; CHECK: phi i8*
60; CHECK: phi i8*
61; CHECK: phi i8*
62; CHECK: phi i8*
63; CHECK: phi i8*
64; CHECK: phi i8*
65; CHECK: phi i8*
66; CHECK: phi i8*
67; CHECK: phi i8*
68; CHECK: phi i8*
69
70  ret i8* %x10
71}
72
73define i32* @test5(i32 %a, i32 %b, i32 %c, i32* dereferenceable(10) %ptr1,
74                  i32* dereferenceable(10) %ptr2, i32** dereferenceable(10) %ptr3) nounwind {
75; CHECK-LABEL: @test5(
76entry:
77        %tmp1 = icmp eq i32 %b, 0
78        br i1 %tmp1, label %bb1, label %bb3
79
80bb1:            ; preds = %entry
81	%tmp2 = icmp sgt i32 %c, 1
82	br i1 %tmp2, label %bb2, label %bb3
83; CHECK: bb1:
84; CHECK-NEXT: icmp sgt i32 %c, 1
85; CHECK-NEXT: load i32*, i32** %ptr3
86; CHECK-NOT: dereferenceable
87; CHECK-NEXT: select i1 %tmp2, i32* %tmp3, i32* %ptr2
88; CHECK-NEXT: ret i32* %tmp3.ptr2
89
90bb2:		; preds = bb1
91        %tmp3 = load i32*, i32** %ptr3, !dereferenceable !{i64 10}
92	br label %bb3
93
94bb3:		; preds = %bb2, %entry
95	%tmp4 = phi i32* [ %ptr1, %entry ], [ %ptr2, %bb1 ], [ %tmp3, %bb2 ]
96	ret i32* %tmp4
97}
98