249 lines
8.1 KiB
LLVM
249 lines
8.1 KiB
LLVM
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; RUN: opt -verify-loop-info -irce -S < %s | FileCheck %s
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; RUN: opt -verify-loop-info -passes='require<branch-prob>,irce' -S < %s | FileCheck %s
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define void @single_access_no_preloop_no_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
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entry:
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%len = load i32, i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
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%idx.next = add i32 %idx, 1
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%abc = icmp slt i32 %idx, %len
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br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
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in.bounds:
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%addr = getelementptr i32, i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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; CHECK-LABEL: @single_access_no_preloop_no_offset(
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; CHECK: loop:
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; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
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; CHECK: main.exit.selector:
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; CHECK-NEXT: %idx.next.lcssa = phi i32 [ %idx.next, %in.bounds ]
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; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n
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; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
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; CHECK: main.pseudo.exit:
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; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
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; CHECK-NEXT: %indvar.end = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
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; CHECK-NEXT: br label %postloop
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; CHECK: postloop:
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; CHECK-NEXT: br label %loop.postloop
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; CHECK: loop.postloop:
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; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
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; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
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; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
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; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
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; CHECK: in.bounds.postloop:
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; CHECK-NEXT: %addr.postloop = getelementptr i32, i32* %arr, i32 %idx.postloop
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; CHECK-NEXT: store i32 0, i32* %addr.postloop
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; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
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; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
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define void @single_access_no_preloop_with_offset(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
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entry:
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%len = load i32, i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
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%idx.next = add i32 %idx, 1
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%idx.for.abc = add i32 %idx, 4
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%abc = icmp slt i32 %idx.for.abc, %len
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br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
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in.bounds:
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%addr = getelementptr i32, i32* %arr, i32 %idx.for.abc
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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; CHECK-LABEL: @single_access_no_preloop_with_offset(
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; CHECK: loop.preheader:
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; CHECK: [[safe_range_end:[^ ]+]] = add nsw i32 %len, -4
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; CHECK: [[exit_main_loop_at_hiclamp_cmp:[^ ]+]] = icmp slt i32 %n, [[safe_range_end]]
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; CHECK: [[exit_main_loop_at_hiclamp:[^ ]+]] = select i1 [[exit_main_loop_at_hiclamp_cmp]], i32 %n, i32 [[safe_range_end]]
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; CHECK: [[exit_main_loop_at_loclamp_cmp:[^ ]+]] = icmp sgt i32 [[exit_main_loop_at_hiclamp]], 0
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; CHECK: [[exit_main_loop_at_loclamp:[^ ]+]] = select i1 [[exit_main_loop_at_loclamp_cmp]], i32 [[exit_main_loop_at_hiclamp]], i32 0
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; CHECK: [[enter_main_loop:[^ ]+]] = icmp slt i32 0, [[exit_main_loop_at_loclamp]]
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; CHECK: br i1 [[enter_main_loop]], label %[[loop_preheader:[^ ,]+]], label %main.pseudo.exit
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; CHECK: loop:
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; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
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; CHECK: in.bounds:
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; CHECK: [[continue_main_loop:[^ ]+]] = icmp slt i32 %idx.next, [[exit_main_loop_at_loclamp]]
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; CHECK: br i1 [[continue_main_loop]], label %loop, label %main.exit.selector
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; CHECK: main.pseudo.exit:
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; CHECK: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
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; CHECK: br label %postloop
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; CHECK: loop.postloop:
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; CHECK: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
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; CHECK: in.bounds.postloop:
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; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
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; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
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; Make sure that we do not do IRCE if we know that the safe iteration range of
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; the main loop is empty.
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define void @single_access_empty_range(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
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entry:
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%len = load i32, i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
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%idx.next = add i32 %idx, 1
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%abc = icmp slt i32 %idx, 0
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br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
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in.bounds:
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%addr = getelementptr i32, i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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; CHECK-LABEL: @single_access_empty_range(
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; CHECK-NOT: br i1 false
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; CHECK-NOT: preloop
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; CHECK-NOT: postloop
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define void @single_access_empty_range_2(i32 *%arr, i32 *%a_len_ptr, i32 %n) {
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entry:
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%len = load i32, i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds2 ]
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%idx.next = add i32 %idx, 1
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%abc = icmp slt i32 %idx, 60
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br i1 %abc, label %in.bounds1, label %out.of.bounds, !prof !1
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in.bounds1:
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%def = icmp slt i32 %idx, 0
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br i1 %def, label %in.bounds2, label %out.of.bounds, !prof !1
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in.bounds2:
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%addr = getelementptr i32, i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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; CHECK-LABEL: @single_access_empty_range_2(
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; CHECK-NOT: br i1 false
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; CHECK-NOT: preloop
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define void @single_access_no_preloop_no_offset_phi_len(i32 *%arr, i32 *%a_len_ptr, i32 *%b_len_ptr, i32 %n, i1 %unknown_cond) {
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entry:
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br i1 %unknown_cond, label %if.true, label %if.false
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if.true:
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%len_a = load i32, i32* %a_len_ptr, !range !0
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br label %merge
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if.false:
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%len_b = load i32, i32* %b_len_ptr, !range !0
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br label %merge
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merge:
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%len = phi i32 [ %len_a, %if.true ], [ %len_b, %if.false ]
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop:
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%idx = phi i32 [ 0, %merge ] , [ %idx.next, %in.bounds ]
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%idx.next = add i32 %idx, 1
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%abc = icmp slt i32 %idx, %len
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br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
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in.bounds:
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%addr = getelementptr i32, i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds:
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ret void
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exit:
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ret void
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}
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; CHECK-LABEL: @single_access_no_preloop_no_offset_phi_len(
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; CHECK: loop:
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; CHECK: br i1 true, label %in.bounds, label %out.of.bounds
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; CHECK: main.exit.selector:
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; CHECK-NEXT: %idx.next.lcssa = phi i32 [ %idx.next, %in.bounds ]
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; CHECK-NEXT: [[continue:%[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n
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; CHECK-NEXT: br i1 [[continue]], label %main.pseudo.exit, label %exit.loopexit
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; CHECK: main.pseudo.exit:
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; CHECK-NEXT: %idx.copy = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
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; CHECK-NEXT: %indvar.end = phi i32 [ 0, %loop.preheader ], [ %idx.next.lcssa, %main.exit.selector ]
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; CHECK-NEXT: br label %postloop
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; CHECK: postloop:
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; CHECK-NEXT: br label %loop.postloop
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; CHECK: loop.postloop:
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; CHECK-NEXT: %idx.postloop = phi i32 [ %idx.next.postloop, %in.bounds.postloop ], [ %idx.copy, %postloop ]
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; CHECK-NEXT: %idx.next.postloop = add i32 %idx.postloop, 1
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; CHECK-NEXT: %abc.postloop = icmp slt i32 %idx.postloop, %len
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; CHECK-NEXT: br i1 %abc.postloop, label %in.bounds.postloop, label %out.of.bounds
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; CHECK: in.bounds.postloop:
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; CHECK-NEXT: %addr.postloop = getelementptr i32, i32* %arr, i32 %idx.postloop
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; CHECK-NEXT: store i32 0, i32* %addr.postloop
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; CHECK-NEXT: %next.postloop = icmp slt i32 %idx.next.postloop, %n
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; CHECK-NEXT: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
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!0 = !{i32 0, i32 2147483647}
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!1 = !{!"branch_weights", i32 64, i32 4}
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