| ; RUN: opt -verify-loop-info -passes=irce -S < %s | FileCheck %s |
| ; RUN: opt -verify-loop-info -passes='require<branch-prob>,irce' -S < %s | FileCheck %s |
| |
| define void @single_access_with_preloop(ptr %arr, ptr %a_len_ptr, i32 %n, i32 %offset) { |
| entry: |
| %len = load i32, ptr %a_len_ptr, !range !0 |
| %first.itr.check = icmp sgt i32 %n, 0 |
| br i1 %first.itr.check, label %loop, label %exit |
| |
| loop: |
| %idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ] |
| %idx.next = add i32 %idx, 1 |
| %array.idx = add i32 %idx, %offset |
| %abc.high = icmp slt i32 %array.idx, %len |
| %abc.low = icmp sge i32 %array.idx, 0 |
| %abc = and i1 %abc.low, %abc.high |
| br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1 |
| |
| in.bounds: |
| %addr = getelementptr i32, ptr %arr, i32 %array.idx |
| store i32 0, ptr %addr |
| %next = icmp slt i32 %idx.next, %n |
| br i1 %next, label %loop, label %exit |
| |
| out.of.bounds: |
| ret void |
| |
| exit: |
| ret void |
| } |
| |
| ; CHECK-LABEL: @single_access_with_preloop( |
| ; CHECK: loop.preheader: |
| ; CHECK: [[safe_offset_preloop:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 -2147483647) |
| ; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version. |
| ; CHECK: [[safe_start:[^ ]+]] = sub i32 0, [[safe_offset_preloop]] |
| ; CHECK: [[exit_preloop_at_loclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 %n, i32 [[safe_start]]) |
| ; CHECK: [[exit_preloop_at:[^ ]+]] = call i32 @llvm.smax.i32(i32 [[exit_preloop_at_loclamp]], i32 0) |
| |
| |
| ; CHECK: [[len_minus_sint_max:[^ ]+]] = add nuw nsw i32 %len, -2147483647 |
| ; CHECK: [[safe_offset_mainloop:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 [[len_minus_sint_max]]) |
| ; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version. |
| ; CHECK: [[safe_upper_end:[^ ]+]] = sub i32 %len, [[safe_offset_mainloop]] |
| ; CHECK: [[exit_mainloop_at_loclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 %n, i32 [[safe_upper_end]]) |
| ; CHECK: [[safe_offset_mainloop_2:[^ ]+]] = call i32 @llvm.smax.i32(i32 %offset, i32 0) |
| ; CHECK: [[safe_lower_end:[^ ]+]] = sub i32 2147483647, [[safe_offset_mainloop_2]] |
| ; CHECK: [[exit_mainloop_at_hiclamp:[^ ]+]] = call i32 @llvm.smin.i32(i32 [[exit_mainloop_at_loclamp]], i32 [[safe_lower_end]]) |
| ; CHECK: [[exit_mainloop_at:[^ ]+]] = call i32 @llvm.smax.i32(i32 [[exit_mainloop_at_hiclamp]], i32 0) |
| |
| ; CHECK: mainloop: |
| ; CHECK: br label %loop |
| |
| ; CHECK: loop: |
| ; CHECK: %abc.high = icmp slt i32 %array.idx, %len |
| ; CHECK: %abc.low = icmp sge i32 %array.idx, 0 |
| ; CHECK: %abc = and i1 true, true |
| ; CHECK: br i1 %abc, label %in.bounds, label %[[loopexit:[^ ,]+]] |
| |
| ; CHECK: in.bounds: |
| ; CHECK: [[continue_mainloop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[exit_mainloop_at]] |
| ; CHECK: br i1 [[continue_mainloop_cond]], label %loop, label %main.exit.selector |
| |
| ; CHECK: main.exit.selector: |
| ; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n |
| ; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit |
| |
| ; CHECK: in.bounds.preloop: |
| ; CHECK: [[continue_preloop_cond:[^ ]+]] = icmp slt i32 %idx.next.preloop, [[exit_preloop_at]] |
| ; CHECK: br i1 [[continue_preloop_cond]], label %loop.preloop, label %preloop.exit.selector |
| |
| ; CHECK: preloop.exit.selector: |
| ; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop.lcssa, %n |
| ; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit |
| |
| ; CHECK: in.bounds.postloop: |
| ; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n |
| ; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit |
| |
| !0 = !{i32 0, i32 2147483647} |
| !1 = !{!"branch_weights", i32 64, i32 4} |