1*9880d681SAndroid Build Coastguard Worker; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker 3*9880d681SAndroid Build Coastguard Worker; CHECK: Loop %bb: backedge-taken count is ((-5 + %x) /u 3) 4*9880d681SAndroid Build Coastguard Worker; CHECK: Loop %bb: max backedge-taken count is 1431655764 5*9880d681SAndroid Build Coastguard Worker 6*9880d681SAndroid Build Coastguard Worker 7*9880d681SAndroid Build Coastguard Worker; ScalarEvolution can't compute a trip count because it doesn't know if 8*9880d681SAndroid Build Coastguard Worker; dividing by the stride will have a remainder. This could theoretically 9*9880d681SAndroid Build Coastguard Worker; be teaching it how to use a more elaborate trip count computation. 10*9880d681SAndroid Build Coastguard Worker 11*9880d681SAndroid Build Coastguard Workerdefine i32 @f(i32 %x) nounwind readnone { 12*9880d681SAndroid Build Coastguard Workerentry: 13*9880d681SAndroid Build Coastguard Worker %0 = icmp ugt i32 %x, 4 ; <i1> [#uses=1] 14*9880d681SAndroid Build Coastguard Worker br i1 %0, label %bb.nph, label %bb2 15*9880d681SAndroid Build Coastguard Worker 16*9880d681SAndroid Build Coastguard Workerbb.nph: ; preds = %entry 17*9880d681SAndroid Build Coastguard Worker br label %bb 18*9880d681SAndroid Build Coastguard Worker 19*9880d681SAndroid Build Coastguard Workerbb: ; preds = %bb.nph, %bb1 20*9880d681SAndroid Build Coastguard Worker %indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb1 ] ; <i32> [#uses=2] 21*9880d681SAndroid Build Coastguard Worker %tmp = mul i32 %indvar, -3 ; <i32> [#uses=1] 22*9880d681SAndroid Build Coastguard Worker %x_addr.04 = add i32 %tmp, %x ; <i32> [#uses=1] 23*9880d681SAndroid Build Coastguard Worker %1 = add i32 %x_addr.04, -3 ; <i32> [#uses=2] 24*9880d681SAndroid Build Coastguard Worker br label %bb1 25*9880d681SAndroid Build Coastguard Worker 26*9880d681SAndroid Build Coastguard Workerbb1: ; preds = %bb 27*9880d681SAndroid Build Coastguard Worker %2 = icmp ugt i32 %1, 4 ; <i1> [#uses=1] 28*9880d681SAndroid Build Coastguard Worker %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1] 29*9880d681SAndroid Build Coastguard Worker br i1 %2, label %bb, label %bb1.bb2_crit_edge 30*9880d681SAndroid Build Coastguard Worker 31*9880d681SAndroid Build Coastguard Workerbb1.bb2_crit_edge: ; preds = %bb1 32*9880d681SAndroid Build Coastguard Worker %.lcssa = phi i32 [ %1, %bb1 ] ; <i32> [#uses=1] 33*9880d681SAndroid Build Coastguard Worker br label %bb2 34*9880d681SAndroid Build Coastguard Worker 35*9880d681SAndroid Build Coastguard Workerbb2: ; preds = %bb1.bb2_crit_edge, %entry 36*9880d681SAndroid Build Coastguard Worker %x_addr.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ %x, %entry ] ; <i32> [#uses=1] 37*9880d681SAndroid Build Coastguard Worker ret i32 %x_addr.0.lcssa 38*9880d681SAndroid Build Coastguard Worker} 39