316 lines
12 KiB
LLVM
316 lines
12 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -enable-nontrivial-unswitch=true -simple-loop-unswitch -S < %s | FileCheck %s
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; RUN: opt -enable-nontrivial-unswitch=true -passes='loop(unswitch),verify<loops>' -S < %s | FileCheck %s
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declare void @may_exit()
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declare void @throw_npe()
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; It is illegal to preserve make_implicit notion of the condition being
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; unswitched because we may exit loop before we reach the condition, so
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; there is no guarantee that following implicit branch always means getting
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; to throw_npe block.
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define i32 @test_should_drop_make_implicit(i32* %p1, i32* %p2) {
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; CHECK-LABEL: @test_should_drop_make_implicit(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i32* [[P2:%.*]], null
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; CHECK-NOT: !make.implicit
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
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; CHECK: entry.split.us:
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; CHECK-NEXT: br label [[LOOP_US:%.*]]
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; CHECK: loop.us:
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; CHECK-NEXT: [[IV_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ]
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; CHECK-NEXT: [[X_US:%.*]] = load i32, i32* [[P1:%.*]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND_US:%.*]] = icmp eq i32 [[X_US]], 0
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; CHECK-NEXT: br i1 [[SIDE_EXIT_COND_US]], label [[SIDE_EXIT_SPLIT_US:%.*]], label [[NULL_CHECK_BLOCK_US:%.*]]
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; CHECK: null_check_block.us:
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; CHECK-NEXT: br label [[THROW_NPE_SPLIT_US:%.*]]
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; CHECK: side_exit.split.us:
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; CHECK-NEXT: br label [[SIDE_EXIT:%.*]]
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; CHECK: throw_npe.split.us:
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; CHECK-NEXT: br label [[THROW_NPE:%.*]]
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P1]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: br i1 [[SIDE_EXIT_COND]], label [[SIDE_EXIT_SPLIT:%.*]], label [[NULL_CHECK_BLOCK:%.*]]
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; CHECK: null_check_block:
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[IV_NEXT]], 10000
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: side_exit.split:
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; CHECK-NEXT: br label [[SIDE_EXIT]]
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; CHECK: side_exit:
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; CHECK-NEXT: ret i32 0
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; CHECK: throw_npe:
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; CHECK-NEXT: call void @throw_npe()
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: [[X_LCSSA2:%.*]] = phi i32 [ [[X]], [[BACKEDGE]] ]
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; CHECK-NEXT: ret i32 [[X_LCSSA2]]
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;
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entry:
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%null_check = icmp eq i32* %p2, null
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %backedge]
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%x = load i32, i32* %p1
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%side_exit_cond = icmp eq i32 %x, 0
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br i1 %side_exit_cond, label %side_exit, label %null_check_block
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null_check_block:
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br i1 %null_check, label %throw_npe, label %backedge, !make.implicit !0
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backedge:
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%iv.next = add i32 %iv,1
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%loop_cond = icmp slt i32 %iv.next, 10000
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br i1 %loop_cond, label %loop, label %exit
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side_exit:
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ret i32 0
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throw_npe:
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call void @throw_npe()
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unreachable
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exit:
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ret i32 %x
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}
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; Here make.implicit notion may be preserved because we always get to throw_npe
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; after following true branch. This is a trivial unswitch.
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define i32 @test_may_keep_make_implicit_trivial(i32* %p1, i32* %p2) {
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; CHECK-LABEL: @test_may_keep_make_implicit_trivial(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i32* [[P2:%.*]], null
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[THROW_NPE:%.*]], label [[ENTRY_SPLIT:%.*]], !make.implicit !0
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P1:%.*]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: br label [[SIDE_EXIT_BLOCK:%.*]]
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; CHECK: side_exit_block:
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; CHECK-NEXT: br i1 [[SIDE_EXIT_COND]], label [[SIDE_EXIT:%.*]], label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[IV_NEXT]], 10000
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: side_exit:
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; CHECK-NEXT: ret i32 0
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; CHECK: throw_npe:
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; CHECK-NEXT: call void @throw_npe()
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: [[X_LCSSA2:%.*]] = phi i32 [ [[X]], [[BACKEDGE]] ]
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; CHECK-NEXT: ret i32 [[X_LCSSA2]]
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;
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entry:
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%null_check = icmp eq i32* %p2, null
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %backedge]
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%x = load i32, i32* %p1
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%side_exit_cond = icmp eq i32 %x, 0
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br i1 %null_check, label %throw_npe, label %side_exit_block, !make.implicit !0
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side_exit_block:
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br i1 %side_exit_cond, label %side_exit, label %backedge
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backedge:
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%iv.next = add i32 %iv,1
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%loop_cond = icmp slt i32 %iv.next, 10000
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br i1 %loop_cond, label %loop, label %exit
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side_exit:
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ret i32 0
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throw_npe:
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call void @throw_npe()
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unreachable
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exit:
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ret i32 %x
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}
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define i32 @test_may_keep_make_implicit_non_trivial(i32* %p1, i32* %p2) {
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; CHECK-LABEL: @test_may_keep_make_implicit_non_trivial(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i32* [[P2:%.*]], null
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]], !make.implicit !0
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; CHECK: entry.split.us:
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; CHECK-NEXT: br label [[LOOP_US:%.*]]
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; CHECK: loop.us:
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; CHECK-NEXT: [[IV_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ]
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; CHECK-NEXT: [[X_US:%.*]] = load i32, i32* [[P1:%.*]], align 4
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; CHECK-NEXT: [[INNER_BLOCK_COND_US:%.*]] = icmp eq i32 [[X_US]], 0
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; CHECK-NEXT: br i1 [[INNER_BLOCK_COND_US]], label [[INNER_BLOCK_US:%.*]], label [[NULL_CHECK_BLOCK_US:%.*]]
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; CHECK: inner_block.us:
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; CHECK-NEXT: br label [[NULL_CHECK_BLOCK_US]]
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; CHECK: null_check_block.us:
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; CHECK-NEXT: br label [[THROW_NPE_SPLIT_US:%.*]]
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; CHECK: throw_npe.split.us:
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; CHECK-NEXT: br label [[THROW_NPE:%.*]]
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P1]], align 4
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; CHECK-NEXT: [[INNER_BLOCK_COND:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: br i1 [[INNER_BLOCK_COND]], label [[INNER_BLOCK:%.*]], label [[NULL_CHECK_BLOCK:%.*]]
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; CHECK: inner_block:
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; CHECK-NEXT: br label [[NULL_CHECK_BLOCK]]
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; CHECK: null_check_block:
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[IV_NEXT]], 10000
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: throw_npe:
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; CHECK-NEXT: call void @throw_npe()
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: [[X_LCSSA1:%.*]] = phi i32 [ [[X]], [[BACKEDGE]] ]
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; CHECK-NEXT: ret i32 [[X_LCSSA1]]
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;
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entry:
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%null_check = icmp eq i32* %p2, null
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %backedge]
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%x = load i32, i32* %p1
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%inner_block_cond = icmp eq i32 %x, 0
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br i1 %inner_block_cond, label %inner_block, label %null_check_block
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inner_block:
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br label %null_check_block
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null_check_block:
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br i1 %null_check, label %throw_npe, label %backedge, !make.implicit !0
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backedge:
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%iv.next = add i32 %iv,1
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%loop_cond = icmp slt i32 %iv.next, 10000
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br i1 %loop_cond, label %loop, label %exit
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throw_npe:
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call void @throw_npe()
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unreachable
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exit:
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ret i32 %x
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}
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; Here make.implicit notion should be dropped because of exiting call.
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define i32 @test_should_drop_make_implicit_exiting_call(i32* %p1, i32* %p2) {
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; CHECK-LABEL: @test_should_drop_make_implicit_exiting_call(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i32* [[P2:%.*]], null
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; CHECK-NOT: !make.implicit
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
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; CHECK: entry.split.us:
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; CHECK-NEXT: br label [[LOOP_US:%.*]]
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; CHECK: loop.us:
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; CHECK-NEXT: [[IV_US:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT_US]] ]
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; CHECK-NEXT: call void @may_exit()
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; CHECK-NEXT: [[X_US:%.*]] = load i32, i32* [[P1:%.*]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND_US:%.*]] = icmp eq i32 [[X_US]], 0
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; CHECK-NEXT: br label [[THROW_NPE_SPLIT_US:%.*]]
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; CHECK: throw_npe.split.us:
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; CHECK-NEXT: br label [[THROW_NPE:%.*]]
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: call void @may_exit()
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P1]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[IV_NEXT]], 10000
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: throw_npe:
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; CHECK-NEXT: call void @throw_npe()
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: [[X_LCSSA1:%.*]] = phi i32 [ [[X]], [[BACKEDGE]] ]
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; CHECK-NEXT: ret i32 [[X_LCSSA1]]
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;
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entry:
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%null_check = icmp eq i32* %p2, null
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %backedge]
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call void @may_exit()
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%x = load i32, i32* %p1
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%side_exit_cond = icmp eq i32 %x, 0
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br i1 %null_check, label %throw_npe, label %backedge, !make.implicit !0
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backedge:
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%iv.next = add i32 %iv,1
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%loop_cond = icmp slt i32 %iv.next, 10000
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br i1 %loop_cond, label %loop, label %exit
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throw_npe:
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call void @throw_npe()
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unreachable
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exit:
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ret i32 %x
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}
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; Here exiting call goes after the null check, so make.implicit may be preserved.
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define i32 @test_may_keep_make_implicit_exiting_call(i32* %p1, i32* %p2) {
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; CHECK-LABEL: @test_may_keep_make_implicit_exiting_call(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NULL_CHECK:%.*]] = icmp eq i32* [[P2:%.*]], null
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; CHECK-NEXT: br i1 [[NULL_CHECK]], label [[THROW_NPE:%.*]], label [[ENTRY_SPLIT:%.*]], !make.implicit !0
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY_SPLIT]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P1:%.*]], align 4
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; CHECK-NEXT: [[SIDE_EXIT_COND:%.*]] = icmp eq i32 [[X]], 0
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp slt i32 [[IV_NEXT]], 10000
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; CHECK-NEXT: call void @may_exit()
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT:%.*]]
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; CHECK: throw_npe:
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; CHECK-NEXT: call void @throw_npe()
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; CHECK-NEXT: unreachable
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; CHECK: exit:
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; CHECK-NEXT: [[X_LCSSA1:%.*]] = phi i32 [ [[X]], [[BACKEDGE]] ]
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; CHECK-NEXT: ret i32 [[X_LCSSA1]]
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;
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entry:
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%null_check = icmp eq i32* %p2, null
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %backedge]
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%x = load i32, i32* %p1
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%side_exit_cond = icmp eq i32 %x, 0
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br i1 %null_check, label %throw_npe, label %backedge, !make.implicit !0
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backedge:
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%iv.next = add i32 %iv,1
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%loop_cond = icmp slt i32 %iv.next, 10000
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call void @may_exit()
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br i1 %loop_cond, label %loop, label %exit
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throw_npe:
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call void @throw_npe()
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unreachable
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exit:
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ret i32 %x
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}
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!0 = !{}
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