| ; RUN: opt < %s -analyze -scalar-evolution 2>&1 | FileCheck %s |
| |
| ; CHECK: Loop %bb: backedge-taken count is ((999 + (-1 * %x)) /u 3) |
| ; CHECK: Loop %bb: max backedge-taken count is 334 |
| |
| |
| ; This is a tricky testcase for unsigned wrap detection which ScalarEvolution |
| ; doesn't yet know how to do. |
| |
| define i32 @f(i32 %x) nounwind readnone { |
| entry: |
| %0 = icmp ugt i32 %x, 999 ; <i1> [#uses=1] |
| br i1 %0, label %bb2, label %bb.nph |
| |
| bb.nph: ; preds = %entry |
| br label %bb |
| |
| bb: ; preds = %bb.nph, %bb1 |
| %indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb1 ] ; <i32> [#uses=2] |
| %tmp = mul i32 %indvar, 3 ; <i32> [#uses=1] |
| %x_addr.04 = add i32 %tmp, %x ; <i32> [#uses=1] |
| %1 = add i32 %x_addr.04, 3 ; <i32> [#uses=2] |
| br label %bb1 |
| |
| bb1: ; preds = %bb |
| %2 = icmp ugt i32 %1, 999 ; <i1> [#uses=1] |
| %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1] |
| br i1 %2, label %bb1.bb2_crit_edge, label %bb |
| |
| bb1.bb2_crit_edge: ; preds = %bb1 |
| %.lcssa = phi i32 [ %1, %bb1 ] ; <i32> [#uses=1] |
| br label %bb2 |
| |
| bb2: ; preds = %bb1.bb2_crit_edge, %entry |
| %x_addr.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ %x, %entry ] ; <i32> [#uses=1] |
| ret i32 %x_addr.0.lcssa |
| } |
