| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -jump-threading < %s | FileCheck %s |
| define i8 @test(i32 %a, i32 %length) { |
| ; CHECK-NEXT: br label [[BACKEDGE:%.*]] |
| ; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE]] ] |
| ; CHECK-NEXT: [[IV_NEXT]] = add nsw i32 [[IV]], 1 |
| ; CHECK-NEXT: [[CONT:%.*]] = icmp slt i32 [[IV_NEXT]], 400 |
| ; CHECK-NEXT: br i1 [[CONT]], label [[BACKEDGE]], label [[EXIT:%.*]] |
| %iv = phi i32 [0, %entry], [%iv.next, %backedge] |
| ;; We can use an inductive argument to prove %iv is always positive |
| %cnd = icmp sge i32 %iv, 0 |
| br i1 %cnd, label %backedge, label %exit |
| %iv.next = add nsw i32 %iv, 1 |
| %cont = icmp slt i32 %iv.next, 400 |
| br i1 %cont, label %loop, label %exit |