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