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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S -passes=loop-unroll -unroll-runtime -unroll-runtime-multi-exit < %s | FileCheck %s3 4; This loop has a known trip count on the non-latch exit. When performing5; runtime unrolling (at least when using a prologue rather than epilogue) we6; should not fold that exit based on known trip count information prior to7; prologue insertion, as that may change the trip count for the modified loop.8 9define void @test(i32 %s, i32 %n) {10; CHECK-LABEL: @test(11; CHECK-NEXT:  entry:12; CHECK-NEXT:    [[N2:%.*]] = add i32 [[S:%.*]], 12313; CHECK-NEXT:    br label [[LOOP:%.*]]14; CHECK:       loop:15; CHECK-NEXT:    [[I:%.*]] = phi i32 [ [[S]], [[ENTRY:%.*]] ], [ [[I_INC:%.*]], [[LATCH:%.*]] ]16; CHECK-NEXT:    [[C1:%.*]] = icmp eq i32 [[I]], [[N2]]17; CHECK-NEXT:    br i1 [[C1]], label [[EXIT1:%.*]], label [[LATCH]]18; CHECK:       latch:19; CHECK-NEXT:    [[C2:%.*]] = icmp eq i32 [[I]], [[N:%.*]]20; CHECK-NEXT:    [[I_INC]] = add i32 [[I]], 121; CHECK-NEXT:    br i1 [[C2]], label [[EXIT2:%.*]], label [[LOOP]]22; CHECK:       exit1:23; CHECK-NEXT:    ret void24; CHECK:       exit2:25; CHECK-NEXT:    ret void26;27entry:28  %n2 = add i32 %s, 12329  br label %loop30 31loop:32  %i = phi i32 [ %s, %entry], [ %i.inc, %latch ]33  %c1 = icmp eq i32 %i, %n234  br i1 %c1, label %exit1, label %latch35 36latch:37  %c2 = icmp eq i32 %i, %n38  %i.inc = add i32 %i, 139  br i1 %c2, label %exit2, label %loop40 41exit1:42  ret void43 44exit2:45  ret void46}47