| ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s |
| |
| ; CHECK: @f |
| ; CHECK: Loop %bb16.preheader: backedge-taken count is (-1 + %c.idx.val) |
| |
| define i32 @f(i32 %c.idx.val) { |
| |
| bb2: |
| %k.018 = add i32 %c.idx.val, -1 ; <i32> [#uses=2] |
| %a14 = icmp slt i32 %k.018, 0 ; <i1> [#uses=1] |
| br i1 %a14, label %bb19, label %bb16.preheader |
| |
| bb16.preheader: |
| %k.019 = phi i32 [ %k.0, %bb18 ], [ %k.018, %bb2 ] ; <i32> [#uses=5] |
| %x = phi i32 [ 0, %bb2 ], [ %x.1, %bb18] |
| br label %bb18 |
| |
| bb18: ; preds = %bb18.loopexit |
| %x.1 = add i32 %x, 1 |
| %k.0 = add i32 %k.019, -1 ; <i32> [#uses=2] |
| %a107 = icmp slt i32 %k.0, 0 ; <i1> [#uses=1] |
| br i1 %a107, label %bb18.bb19_crit_edge, label %bb16.preheader |
| |
| bb18.bb19_crit_edge: |
| ret i32 %x |
| |
| bb19: |
| ret i32 0 |
| |
| } |