1; RUN: opt < %s -analyze -enable-new-pm=0 -scalar-evolution | FileCheck %s 2; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s 3 4; CHECK: @f 5; CHECK: Loop %bb16.preheader: backedge-taken count is (-1 + %c.idx.val) 6 7define i32 @f(i32 %c.idx.val) { 8 9bb2: 10 %k.018 = add i32 %c.idx.val, -1 ; <i32> [#uses=2] 11 %a14 = icmp slt i32 %k.018, 0 ; <i1> [#uses=1] 12 br i1 %a14, label %bb19, label %bb16.preheader 13 14bb16.preheader: 15 %k.019 = phi i32 [ %k.0, %bb18 ], [ %k.018, %bb2 ] ; <i32> [#uses=5] 16 %x = phi i32 [ 0, %bb2 ], [ %x.1, %bb18] 17 br label %bb18 18 19bb18: ; preds = %bb18.loopexit 20 %x.1 = add i32 %x, 1 21 %k.0 = add i32 %k.019, -1 ; <i32> [#uses=2] 22 %a107 = icmp slt i32 %k.0, 0 ; <i1> [#uses=1] 23 br i1 %a107, label %bb18.bb19_crit_edge, label %bb16.preheader 24 25bb18.bb19_crit_edge: 26 ret i32 %x 27 28bb19: 29 ret i32 0 30 31} 32