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llvm-mirror/test/Transforms/LoopDeletion/irreducible-cfg.ll

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -loop-deletion -S | FileCheck %s
; RUN: opt < %s -passes='loop(loop-deletion)' -S | FileCheck %s
; Make sure we do not get the miscompile on this test with irreducible CFG.
define i16 @test_01(i16 %j, i16 %k, i16 %recurs) { ; If we have %j: 1, %k: 1, %recurs: 0
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i16 [[RECURS:%.*]], 0
; CHECK-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_END:%.*]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[CALL:%.*]] = tail call i16 @test_01(i16 0, i16 0, i16 0)
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16 [[J:%.*]], 0
; CHECK-NEXT: br label [[BB2:%.*]]
; CHECK: bb2:
; CHECK-NEXT: [[K_ADDR_0:%.*]] = phi i16 [ [[K:%.*]], [[IF_END]] ], [ [[K_ADDR_2:%.*]], [[BB12:%.*]] ]
; CHECK-NEXT: [[RESULT_0:%.*]] = phi i16 [ 0, [[IF_END]] ], [ 20, [[BB12]] ]
; CHECK-NEXT: br i1 [[CMP]], label [[BB12]], label [[BB4:%.*]]
; CHECK: bb4:
; CHECK-NEXT: [[K_ADDR_1:%.*]] = phi i16 [ [[K_ADDR_0]], [[BB2]] ], [ [[K_ADDR_2]], [[BB12]] ]
; CHECK-NEXT: [[X_1:%.*]] = phi i16 [ 0, [[BB2]] ], [ 1, [[BB12]] ]
; CHECK-NEXT: [[RESULT_1:%.*]] = phi i16 [ [[RESULT_0]], [[BB2]] ], [ 10, [[BB12]] ]
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i16 [[K_ADDR_1]], 0
; CHECK-NEXT: br i1 [[CMP2]], label [[BB13:%.*]], label [[BB12]]
; CHECK: bb12:
; CHECK-NEXT: [[K_ADDR_2]] = phi i16 [ [[K_ADDR_0]], [[BB2]] ], [ 0, [[BB4]] ]
; CHECK-NEXT: [[X_2:%.*]] = phi i16 [ 1, [[BB2]] ], [ [[X_1]], [[BB4]] ]
; CHECK-NEXT: [[CMP5:%.*]] = icmp eq i16 [[X_2]], 0
; CHECK-NEXT: br i1 [[CMP5]], label [[BB2]], label [[BB4]]
; CHECK: bb13:
; CHECK-NEXT: [[RESULT_1_LCSSA:%.*]] = phi i16 [ [[RESULT_1]], [[BB4]] ]
; CHECK-NEXT: ret i16 [[RESULT_1_LCSSA]]
;
entry:
%tobool.not = icmp eq i16 %recurs, 0 ; 1
br i1 %tobool.not, label %if.end, label %if.then ; -> if.end
if.then: ; preds = %entry
%call = tail call i16 @test_01(i16 0, i16 0, i16 0)
br label %if.end
if.end: ; preds = %if.then, %entry
%cmp = icmp eq i16 %j, 0 ; 0
br label %bb2 ; -> bb2
bb2: ; preds = %bb12, %if.end
%k.addr.0 = phi i16 [ %k, %if.end ], [ %k.addr.2, %bb12 ] ; 1
%result.0 = phi i16 [ 0, %if.end ], [ 20, %bb12 ] ; 0
br i1 %cmp, label %bb12, label %bb4 ; %cmp: 0 -> bb4
bb4: ; preds = %bb12, %bb2
%k.addr.1 = phi i16 [ %k.addr.0, %bb2 ], [ %k.addr.2, %bb12 ] ; 1
%x.1 = phi i16 [ 0, %bb2 ], [ 1, %bb12 ] ; 0
%result.1 = phi i16 [ %result.0, %bb2 ], [ 10, %bb12 ]
%cmp2 = icmp eq i16 %k.addr.1, 0 ; 0
br i1 %cmp2, label %bb13, label %bb12 ; -> bb12
bb12: ; preds = %bb4, %bb2
%k.addr.2 = phi i16 [ %k.addr.0, %bb2 ], [ 0, %bb4 ] ; 0
%x.2 = phi i16 [ 1, %bb2 ], [ %x.1, %bb4 ] ; 0
%cmp5 = icmp eq i16 %x.2, 0 ; 1
br i1 %cmp5, label %bb2, label %bb4 ; -> bb2
bb13: ; preds = %bb4
%result.1.lcssa = phi i16 [ %result.1, %bb4 ]
ret i16 %result.1.lcssa
}
; Another nasty case of irreducible CFG. Make sure we do not crash here.
define void @test_02() {
; CHECK-LABEL: @test_02(
; CHECK-NEXT: bb:
; CHECK-NEXT: br label [[BB17:%.*]]
; CHECK: bb1:
; CHECK-NEXT: ret void
; CHECK: bb2:
; CHECK-NEXT: unreachable
; CHECK: bb3:
; CHECK-NEXT: unreachable
; CHECK: bb4:
; CHECK-NEXT: unreachable
; CHECK: bb5:
; CHECK-NEXT: unreachable
; CHECK: bb6:
; CHECK-NEXT: unreachable
; CHECK: bb7:
; CHECK-NEXT: unreachable
; CHECK: bb8:
; CHECK-NEXT: unreachable
; CHECK: bb9:
; CHECK-NEXT: switch i8 undef, label [[BB13:%.*]] [
; CHECK-NEXT: i8 3, label [[BB10:%.*]]
; CHECK-NEXT: i8 43, label [[BB10]]
; CHECK-NEXT: i8 37, label [[BB11:%.*]]
; CHECK-NEXT: i8 2, label [[BB12:%.*]]
; CHECK-NEXT: i8 4, label [[BB12]]
; CHECK-NEXT: i8 20, label [[BB12]]
; CHECK-NEXT: i8 42, label [[BB12]]
; CHECK-NEXT: i8 44, label [[BB12]]
; CHECK-NEXT: i8 54, label [[BB12]]
; CHECK-NEXT: ]
; CHECK: bb10:
; CHECK-NEXT: unreachable
; CHECK: bb11:
; CHECK-NEXT: unreachable
; CHECK: bb12:
; CHECK-NEXT: br label [[BB19:%.*]]
; CHECK: bb13:
; CHECK-NEXT: unreachable
; CHECK: bb14:
; CHECK-NEXT: unreachable
; CHECK: bb15:
; CHECK-NEXT: unreachable
; CHECK: bb16:
; CHECK-NEXT: br label [[BB17]]
; CHECK: bb17:
; CHECK-NEXT: [[TMP:%.*]] = icmp sgt i32 0, 1
; CHECK-NEXT: br i1 [[TMP]], label [[BB18:%.*]], label [[BB19]]
; CHECK: bb18:
; CHECK-NEXT: br label [[BB20:%.*]]
; CHECK: bb19:
; CHECK-NEXT: br label [[BB20]]
; CHECK: bb20:
; CHECK-NEXT: switch i8 undef, label [[BB16:%.*]] [
; CHECK-NEXT: i8 0, label [[BB1:%.*]]
; CHECK-NEXT: i8 1, label [[BB1]]
; CHECK-NEXT: i8 8, label [[BB1]]
; CHECK-NEXT: i8 9, label [[BB1]]
; CHECK-NEXT: i8 12, label [[BB1]]
; CHECK-NEXT: i8 13, label [[BB1]]
; CHECK-NEXT: i8 40, label [[BB1]]
; CHECK-NEXT: i8 41, label [[BB1]]
; CHECK-NEXT: i8 52, label [[BB1]]
; CHECK-NEXT: i8 53, label [[BB1]]
; CHECK-NEXT: i8 55, label [[BB15:%.*]]
; CHECK-NEXT: i8 15, label [[BB14:%.*]]
; CHECK-NEXT: i8 29, label [[BB9:%.*]]
; CHECK-NEXT: i8 37, label [[BB8:%.*]]
; CHECK-NEXT: i8 69, label [[BB3:%.*]]
; CHECK-NEXT: i8 89, label [[BB7:%.*]]
; CHECK-NEXT: i8 85, label [[BB6:%.*]]
; CHECK-NEXT: i8 81, label [[BB5:%.*]]
; CHECK-NEXT: i8 65, label [[BB2:%.*]]
; CHECK-NEXT: i8 73, label [[BB4:%.*]]
; CHECK-NEXT: ]
;
bb:
br label %bb17
bb1: ; preds = %bb20, %bb20, %bb20, %bb20, %bb20, %bb20, %bb20, %bb20, %bb20, %bb20
ret void
bb2: ; preds = %bb20
unreachable
bb3: ; preds = %bb20
unreachable
bb4: ; preds = %bb20
unreachable
bb5: ; preds = %bb20
unreachable
bb6: ; preds = %bb20
unreachable
bb7: ; preds = %bb20
unreachable
bb8: ; preds = %bb20
unreachable
bb9: ; preds = %bb20
switch i8 undef, label %bb13 [
i8 3, label %bb10
i8 43, label %bb10
i8 37, label %bb11
i8 2, label %bb12
i8 4, label %bb12
i8 20, label %bb12
i8 42, label %bb12
i8 44, label %bb12
i8 54, label %bb12
]
bb10: ; preds = %bb9, %bb9
unreachable
bb11: ; preds = %bb9
unreachable
bb12: ; preds = %bb9, %bb9, %bb9, %bb9, %bb9, %bb9
br label %bb19
bb13: ; preds = %bb9
unreachable
bb14: ; preds = %bb20
unreachable
bb15: ; preds = %bb20
unreachable
bb16: ; preds = %bb20
br label %bb17
bb17: ; preds = %bb16, %bb
%tmp = icmp sgt i32 0, 1
br i1 %tmp, label %bb18, label %bb19
bb18: ; preds = %bb17
br label %bb20
bb19: ; preds = %bb17, %bb12
br label %bb20
bb20: ; preds = %bb19, %bb18
switch i8 undef, label %bb16 [
i8 0, label %bb1
i8 1, label %bb1
i8 8, label %bb1
i8 9, label %bb1
i8 12, label %bb1
i8 13, label %bb1
i8 40, label %bb1
i8 41, label %bb1
i8 52, label %bb1
i8 53, label %bb1
i8 55, label %bb15
i8 15, label %bb14
i8 29, label %bb9
i8 37, label %bb8
i8 69, label %bb3
i8 89, label %bb7
i8 85, label %bb6
i8 81, label %bb5
i8 65, label %bb2
i8 73, label %bb4
]
}
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