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1; RUN: opt -verify-loop-info -passes=irce -S < %s | FileCheck %s2; RUN: opt -verify-loop-info -passes='require<branch-prob>,irce' -S < %s | FileCheck %s3 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 !07 %first.itr.check = icmp sgt i32 %n, 08 br i1 %first.itr.check, label %loop, label %exit9 10 loop:11 %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]12 %idx.next = add i32 %idx, 113 %array.idx = add i32 %idx, %offset14 %abc.high = icmp slt i32 %array.idx, %len15 %abc.low = icmp sge i32 %array.idx, 016 %abc = and i1 %abc.low, %abc.high17 br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !118 19 in.bounds:20 %addr = getelementptr i32, ptr %arr, i32 %array.idx21 store i32 0, ptr %addr22 %next = icmp slt i32 %idx.next, %n23 br i1 %next, label %loop, label %exit24 25 out.of.bounds:26 ret void27 28 exit:29 ret void30}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, -214748364742; 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 %loop53 54; CHECK: loop:55; CHECK: %abc.high = icmp slt i32 %array.idx, %len56; CHECK: %abc.low = icmp sge i32 %array.idx, 057; CHECK: %abc = and i1 true, true58; 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.selector63 64; CHECK: main.exit.selector:65; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n66; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit67 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.selector71 72; CHECK: preloop.exit.selector:73; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop.lcssa, %n74; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit75 76; CHECK: in.bounds.postloop:77; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n78; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit79 80!0 = !{i32 0, i32 2147483647}81!1 = !{!"branch_weights", i32 64, i32 4}82