| ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s | |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" | |
| target triple = "x86_64-unknown-linux-gnu" | |
| ; Previously in this case the max backedge count would be computed as 1/0, which | |
| ; is correct but undesirable. It would also not fold as a constant, tripping | |
| ; asserts in SCEV. | |
| define void @pluto(i32 %arg) { | |
| ; CHECK-LABEL: Classifying expressions for: @pluto | |
| ; CHECK: Loop %bb2: max backedge-taken count is 2 | |
| bb: | |
| %tmp = ashr i32 %arg, 31 | |
| %tmp1 = add nsw i32 %tmp, 2 | |
| br label %bb2 | |
| bb2: ; preds = %bb2, %bb | |
| %tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ] | |
| %tmp4 = add nuw nsw i32 %tmp1, %tmp3 | |
| %tmp5 = icmp ult i32 %tmp4, 2 | |
| br i1 %tmp5, label %bb2, label %bb6 | |
| bb6: ; preds = %bb2 | |
| ret void | |
| } |