blob: fdcacaa7f1d0386cb173b72142738267279c1ea6 [file] [log] [blame]
; RUN: opt < %s -disable-output "-passes=print<iv-users>" -S 2>&1 | 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, ptr %p) {
br label %first_loop
%i = phi i64 [20, %entry], [, %first_loop] = add nuw nsw i64 %i, 1
%cond1 = icmp ult i64, %a
br i1 %cond1, label %first_loop, label %middle_block
%b = load i64, ptr %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
%j = phi i64 [%s, %middle_block], [, %second_loop] = add nuw nsw i64 %j, 1
%cond2 = icmp ult i64, 100
br i1 %cond2, label %second_loop, label %return
ret void