1 ; RUN: opt < %s -analyze -iv-users -S | FileCheck %s 2 3 ; This is a regression test for the commit rL327362. 4 5 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128-ni:1" 6 target triple = "x86_64-unknown-linux-gnu" 7 8 define void @test(i64 %a, i64* %p) { 9 entry: 10 br label %first_loop 11 12 first_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 18 middle_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 31 second_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 37 return: 38 ret void 39 } 40
