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