1 ; RUN: opt -irce -S < %s | FileCheck %s 2 3 define void @single_access_with_preloop(i32 *%arr, i32 *%a_len_ptr, i32 %n, i32 %offset) { 4 entry: 5 %len = load i32, i32* %a_len_ptr, !range !0 6 %first.itr.check = icmp sgt i32 %n, 0 7 br i1 %first.itr.check, label %loop, label %exit 8 9 loop: 10 %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ] 11 %idx.next = add i32 %idx, 1 12 %array.idx = add i32 %idx, %offset 13 %abc.high = icmp slt i32 %array.idx, %len 14 %abc.low = icmp sge i32 %array.idx, 0 15 %abc = and i1 %abc.low, %abc.high 16 br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1 17 18 in.bounds: 19 %addr = getelementptr i32, i32* %arr, i32 %array.idx 20 store i32 0, i32* %addr 21 %next = icmp slt i32 %idx.next, %n 22 br i1 %next, label %loop, label %exit 23 24 out.of.bounds: 25 ret void 26 27 exit: 28 ret void 29 } 30 31 ; CHECK-LABEL: loop.preheader: 32 ; CHECK: [[not_safe_start:[^ ]+]] = add i32 %offset, -1 33 ; CHECK: [[not_n:[^ ]+]] = sub i32 -1, %n 34 ; CHECK: [[not_exit_preloop_at_cond_loclamp:[^ ]+]] = icmp sgt i32 [[not_safe_start]], [[not_n]] 35 ; CHECK: [[not_exit_preloop_at_loclamp:[^ ]+]] = select i1 [[not_exit_preloop_at_cond_loclamp]], i32 [[not_safe_start]], i32 [[not_n]] 36 ; CHECK: [[exit_preloop_at_loclamp:[^ ]+]] = sub i32 -1, [[not_exit_preloop_at_loclamp]] 37 ; CHECK: [[exit_preloop_at_cond:[^ ]+]] = icmp sgt i32 [[exit_preloop_at_loclamp]], 0 38 ; CHECK: [[exit_preloop_at:[^ ]+]] = select i1 [[exit_preloop_at_cond]], i32 [[exit_preloop_at_loclamp]], i32 0 39 40 41 ; CHECK: [[not_safe_start_2:[^ ]+]] = add i32 %offset, -1 42 ; CHECK: [[not_safe_end:[^ ]+]] = sub i32 [[not_safe_start_2]], %len 43 ; CHECK: [[not_exit_mainloop_at_cond_loclamp:[^ ]+]] = icmp sgt i32 [[not_safe_end]], [[not_n]] 44 ; CHECK: [[not_exit_mainloop_at_loclamp:[^ ]+]] = select i1 [[not_exit_mainloop_at_cond_loclamp]], i32 [[not_safe_end]], i32 [[not_n]] 45 ; CHECK: [[exit_mainloop_at_loclamp:[^ ]+]] = sub i32 -1, [[not_exit_mainloop_at_loclamp]] 46 ; CHECK: [[exit_mainloop_at_cmp:[^ ]+]] = icmp sgt i32 [[exit_mainloop_at_loclamp]], 0 47 ; CHECK: [[exit_mainloop_at:[^ ]+]] = select i1 [[exit_mainloop_at_cmp]], i32 [[exit_mainloop_at_loclamp]], i32 0 48 49 50 ; CHECK-LABEL: in.bounds: 51 ; CHECK: [[continue_mainloop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[exit_mainloop_at]] 52 ; CHECK: br i1 [[continue_mainloop_cond]], label %loop, label %main.exit.selector 53 54 ; CHECK-LABEL: main.exit.selector: 55 ; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next, %n 56 ; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit 57 58 ; CHECK-LABEL: in.bounds.preloop: 59 ; CHECK: [[continue_preloop_cond:[^ ]+]] = icmp slt i32 %idx.next.preloop, [[exit_preloop_at]] 60 ; CHECK: br i1 [[continue_preloop_cond]], label %loop.preloop, label %preloop.exit.selector 61 62 ; CHECK-LABEL: preloop.exit.selector: 63 ; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop, %n 64 ; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit 65 66 ; CHECK-LABEL: in.bounds.postloop: 67 ; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n 68 ; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit 69 70 !0 = !{i32 0, i32 2147483647} 71 !1 = !{!"branch_weights", i32 64, i32 4} 72
