1 ; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s 2 ; PR1597 3 4 ; CHECK: Loop %bb: backedge-taken count is (-1 + (-1 * %x) + %y) 5 6 define i32 @f(i32 %x, i32 %y) { 7 entry: 8 %tmp63 = icmp ult i32 %x, %y ; <i1> [#uses=1] 9 br i1 %tmp63, label %bb.preheader, label %bb8 10 11 bb.preheader: ; preds = %entry 12 br label %bb 13 14 bb: ; preds = %bb3, %bb.preheader 15 %x_addr.0 = phi i32 [ %tmp2, %bb3 ], [ %x, %bb.preheader ] ; <i32> [#uses=1] 16 %tmp2 = add i32 %x_addr.0, 1 ; <i32> [#uses=3] 17 br label %bb3 18 19 bb3: ; preds = %bb 20 %tmp6 = icmp ult i32 %tmp2, %y ; <i1> [#uses=1] 21 br i1 %tmp6, label %bb, label %bb8.loopexit 22 23 bb8.loopexit: ; preds = %bb3 24 br label %bb8 25 26 bb8: ; preds = %bb8.loopexit, %entry 27 %x_addr.1 = phi i32 [ %x, %entry ], [ %tmp2, %bb8.loopexit ] ; <i32> [#uses=1] 28 br label %return 29 30 return: ; preds = %bb8 31 ret i32 %x_addr.1 32 } 33
