1; RUN: opt < %s -analyze -iv-users -S | FileCheck %s
2
3; This is a regression test for the commit rL327362.
4
5target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1"
6target triple = "x86_64-unknown-linux-gnu"
7
8define void @test(i64 %a, i64* %p) {
9entry:
10  br label %first_loop
11
12first_loop:
13  %i = phi i64 [20, %entry], [%i.next, %first_loop]
14  %i.next = add nuw nsw i64 %i, 1
15  %cond1 = icmp ult i64 %i.next, %a
16  br i1 %cond1, label %first_loop, label %middle_block
17
18middle_block:
19  %b = load i64, i64* %p
20  %cmp = icmp ult i64 %i, %b
21; When SCEV will try to compute the initial value for %j
22; it will observe umax generated by this select.
23; When it will try to simplify this umax it will invoke
24; isKnownPredicate with AddRec for %i and unknown SCEV for %b.
25; As a result we find MDL == first_loop where %b is not available
26; at loop entry.
27; CHECK: IV Users for loop %second_loop with backedge-taken count{{.*}}umax
28  %s = select i1 %cmp, i64 %i, i64 %b
29  br label %second_loop
30
31second_loop:
32  %j = phi i64 [%s, %middle_block], [%j.next, %second_loop]
33  %j.next = add nuw nsw i64 %j, 1
34  %cond2 = icmp ult i64 %j.next, 100
35  br i1 %cond2, label %second_loop, label %return
36
37return:
38  ret void
39}
40