1 ; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s 2 3 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 ; Previously in this case the max backedge count would be computed as 1/0, which 7 ; is correct but undesirable. It would also not fold as a constant, tripping 8 ; asserts in SCEV. 9 10 define void @pluto(i32 %arg) { 11 ; CHECK-LABEL: Classifying expressions for: @pluto 12 ; CHECK: Loop %bb2: max backedge-taken count is 2 13 bb: 14 %tmp = ashr i32 %arg, 31 15 %tmp1 = add nsw i32 %tmp, 2 16 br label %bb2 17 18 bb2: ; preds = %bb2, %bb 19 %tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb2 ] 20 %tmp4 = add nuw nsw i32 %tmp1, %tmp3 21 %tmp5 = icmp ult i32 %tmp4, 2 22 br i1 %tmp5, label %bb2, label %bb6 23 24 bb6: ; preds = %bb2 25 ret void 26 } 27
