1; RUN: opt -verify-loop-info -passes=irce -S < %s | FileCheck %s 2; RUN: opt -verify-loop-info -passes='require<branch-prob>,irce' -S < %s | FileCheck %s 3 4define void @single_access_with_preloop(ptr %arr, ptr %a_len_ptr, i32 %n, i32 %offset) { 5 entry: 6 %len = load i32, ptr %a_len_ptr, !range !0 7 %first.itr.check = icmp sgt i32 %n, 0 8 br i1 %first.itr.check, label %loop, label %exit 9 10 loop: 11 %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ] 12 %idx.next = add i32 %idx, 1 13 %array.idx = add i32 %idx, %offset 14 %abc.high = icmp slt i32 %array.idx, %len 15 %abc.low = icmp sge i32 %array.idx, 0 16 %abc = and i1 %abc.low, %abc.high 17 br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1 18 19 in.bounds: 20 %addr = getelementptr i32, ptr %arr, i32 %array.idx 21 store i32 0, ptr %addr 22 %next = icmp slt i32 %idx.next, %n 23 br i1 %next, label %loop, label %exit 24 25 out.of.bounds: 26 ret void 27 28 exit: 29 ret void 30} 31 32; CHECK-LABEL: @single_access_with_preloop( 33; CHECK: loop.preheader: 34; CHECK: [[safe_offset_preloop:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 -2147483647) 35; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version. 36; CHECK: [[safe_start:[^ ]+]] = sub i32 0, [[safe_offset_preloop]] 37; CHECK: [[exit_preloop_at_loclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 %n, i32 [[safe_start]]) 38; CHECK: [[exit_preloop_at:[^ ]+]] = call i32 @llvm.smax.i32(i32 [[exit_preloop_at_loclamp]], i32 0) 39 40 41; CHECK: [[len_minus_sint_max:[^ ]+]] = add nuw nsw i32 %len, -2147483647 42; CHECK: [[safe_offset_mainloop:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 [[len_minus_sint_max]]) 43; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version. 44; CHECK: [[safe_upper_end:[^ ]+]] = sub i32 %len, [[safe_offset_mainloop]] 45; CHECK: [[exit_mainloop_at_loclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 %n, i32 [[safe_upper_end]]) 46; CHECK: [[safe_offset_mainloop_2:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 0) 47; CHECK: [[safe_lower_end:[^ ]+]] = sub i32 2147483647, [[safe_offset_mainloop_2]] 48; CHECK: [[exit_mainloop_at_hiclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 [[exit_mainloop_at_loclamp]], i32 [[safe_lower_end]]) 49; CHECK: [[exit_mainloop_at:[^ ]+]] = call i32 @llvm.smax.i32(i32 [[exit_mainloop_at_hiclamp]], i32 0) 50 51; CHECK: mainloop: 52; CHECK: br label %loop 53 54; CHECK: loop: 55; CHECK: %abc.high = icmp slt i32 %array.idx, %len 56; CHECK: %abc.low = icmp sge i32 %array.idx, 0 57; CHECK: %abc = and i1 true, true 58; CHECK: br i1 %abc, label %in.bounds, label %[[loopexit:[^ ,]+]] 59 60; CHECK: in.bounds: 61; CHECK: [[continue_mainloop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[exit_mainloop_at]] 62; CHECK: br i1 [[continue_mainloop_cond]], label %loop, label %main.exit.selector 63 64; CHECK: main.exit.selector: 65; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n 66; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit 67 68; CHECK: in.bounds.preloop: 69; CHECK: [[continue_preloop_cond:[^ ]+]] = icmp slt i32 %idx.next.preloop, [[exit_preloop_at]] 70; CHECK: br i1 [[continue_preloop_cond]], label %loop.preloop, label %preloop.exit.selector 71 72; CHECK: preloop.exit.selector: 73; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop.lcssa, %n 74; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit 75 76; CHECK: in.bounds.postloop: 77; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n 78; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit 79 80!0 = !{i32 0, i32 2147483647} 81!1 = !{!"branch_weights", i32 64, i32 4} 82