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1; RUN: llc -march=mipsel -O3 < %s | FileCheck %s
2
3
4; MIPS direct branches implicitly define register $at. This test makes sure that
5; code hoisting optimization (which moves identical instructions at the start of
6; two basic blocks to the common predecessor block) takes this into account and
7; doesn't move definition of $at to the predecessor block (which would make $at
8; live-in at the start of successor block).
9
10
11; CHECK-LABEL: readLumaCoeff8x8_CABAC
12
13; The check for first "addiu" instruction is added so that we can match the correct "b" instruction.
14; CHECK:           addiu ${{[0-9]+}}, $zero, -1
15; CHECK:           b $[[BB0:BB[0-9_]+]]
16; CHECK-NEXT:      addiu ${{[0-9]+}}, $zero, 0
17
18; Check that at the start of a fallthrough block there is a instruction that writes to $1.
19; CHECK-NEXT:  {{BB[0-9_#]+}}:
20; CHECK-NEXT:      lw      $[[R1:[0-9]+]], %got(assignSE2partition)($[[R2:[0-9]+]])
21; CHECK-NEXT:      sll $1, $[[R0:[0-9]+]], 4
22
23; Check that identical instructions are at the start of a target block.
24; CHECK:       [[BB0]]:
25; CHECK-NEXT:      lw      $[[R1]], %got(assignSE2partition)($[[R2]])
26; CHECK-NEXT:      sll $1, $[[R0]], 4
27
28
29%struct.img_par = type { i32, i32, i32, i32, i32*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [16 x [16 x i16]], [6 x [32 x i32]], [16 x [16 x i32]], [4 x [12 x [4 x [4 x i32]]]], [16 x i32], i8**, i32*, i32***, i32**, i32, i32, i32, i32, %struct.Slice*, %struct.macroblock*, i32, i32, i32, i32, i32, i32, %struct.DecRefPicMarking_s*, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [3 x i32], i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32***, i32***, i32****, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [3 x [2 x i32]], [3 x [2 x i32]], i32, i32, i32, i32, %struct.timeb, %struct.timeb, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32 }
30%struct.Slice = type { i32, i32, i32, i32, i32, i32, i32, i32, i32, %struct.datapartition*, %struct.MotionInfoContexts*, %struct.TextureInfoContexts*, i32, i32*, i32*, i32*, i32, i32*, i32*, i32*, i32 (%struct.img_par*, %struct.inp_par*)*, i32, i32, i32, i32 }
31%struct.datapartition = type { %struct.Bitstream*, %struct.DecodingEnvironment, i32 (%struct.syntaxelement*, %struct.img_par*, %struct.datapartition*)* }
32%struct.Bitstream = type { i32, i32, i32, i32, i8*, i32 }
33%struct.DecodingEnvironment = type { i32, i32, i32, i32, i32, i8*, i32* }
34%struct.syntaxelement = type { i32, i32, i32, i32, i32, i32, i32, i32, void (i32, i32, i32*, i32*)*, void (%struct.syntaxelement*, %struct.img_par*, %struct.DecodingEnvironment*)* }
35%struct.MotionInfoContexts = type { [4 x [11 x %struct.BiContextType]], [2 x [9 x %struct.BiContextType]], [2 x [10 x %struct.BiContextType]], [2 x [6 x %struct.BiContextType]], [4 x %struct.BiContextType], [4 x %struct.BiContextType], [3 x %struct.BiContextType] }
36%struct.BiContextType = type { i16, i8 }
37%struct.TextureInfoContexts = type { [2 x %struct.BiContextType], [4 x %struct.BiContextType], [3 x [4 x %struct.BiContextType]], [10 x [4 x %struct.BiContextType]], [10 x [15 x %struct.BiContextType]], [10 x [15 x %struct.BiContextType]], [10 x [5 x %struct.BiContextType]], [10 x [5 x %struct.BiContextType]], [10 x [15 x %struct.BiContextType]], [10 x [15 x %struct.BiContextType]] }
38%struct.inp_par = type { [1000 x i8], [1000 x i8], [1000 x i8], i32, i32, i32, i32, i32, i32, i32, i32 }
39%struct.macroblock = type { i32, [2 x i32], i32, i32, %struct.macroblock*, %struct.macroblock*, i32, [2 x [4 x [4 x [2 x i32]]]], i32, i64, i64, i32, i32, [4 x i8], [4 x i8], i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32 }
40%struct.DecRefPicMarking_s = type { i32, i32, i32, i32, i32, %struct.DecRefPicMarking_s* }
41%struct.timeb = type { i32, i16, i16, i16 }
42
43@assignSE2partition = external global [0 x [20 x i32]]
44@FIELD_SCAN8x8 = external constant [64 x [2 x i8]]
45
46
47define void @readLumaCoeff8x8_CABAC(%struct.img_par* %img, i32 %b8) {
48
49  %1 = load i32, i32* undef, align 4
50  br i1 false, label %2, label %3
51
52; <label>:2                                       ; preds = %0
53  br label %3
54
55; <label>:3                                       ; preds = %2, %0
56  br i1 undef, label %switch.lookup, label %4
57
58switch.lookup:                                    ; preds = %3
59  br label %4
60
61; <label>:4                                       ; preds = %switch.lookup, %3
62  br i1 undef, label %5, label %6
63
64; <label>:5                                       ; preds = %4
65  br label %6
66
67; <label>:6                                       ; preds = %5, %4
68  %7 = phi [2 x i8]* [ getelementptr inbounds ([64 x [2 x i8]], [64 x [2 x i8]]* @FIELD_SCAN8x8, i32 0, i32 0), %4 ], [ null, %5 ]
69  br i1 undef, label %switch.lookup6, label %8
70
71switch.lookup6:                                   ; preds = %6
72  br label %8
73
74; <label>:8                                       ; preds = %switch.lookup6, %6
75  br i1 undef, label %.loopexit, label %9
76
77; <label>:9                                       ; preds = %8
78  %10 = and i32 %b8, 1
79  %11 = shl nuw nsw i32 %10, 3
80  %12 = getelementptr inbounds %struct.Slice, %struct.Slice* null, i32 0, i32 9
81  br i1 undef, label %.preheader, label %.preheader11
82
83.preheader11:                                     ; preds = %21, %9
84  %k.014 = phi i32 [ %27, %21 ], [ 0, %9 ]
85  %coef_ctr.013 = phi i32 [ %23, %21 ], [ -1, %9 ]
86  br i1 false, label %13, label %14
87
88; <label>:13                                      ; preds = %.preheader11
89  br label %15
90
91; <label>:14                                      ; preds = %.preheader11
92  br label %15
93
94; <label>:15                                      ; preds = %14, %13
95  %16 = getelementptr inbounds [0 x [20 x i32]], [0 x [20 x i32]]* @assignSE2partition, i32 0, i32 %1, i32 undef
96  %17 = load i32, i32* %16, align 4
97  %18 = getelementptr inbounds %struct.datapartition, %struct.datapartition* null, i32 %17, i32 2
98  %19 = load i32 (%struct.syntaxelement*, %struct.img_par*, %struct.datapartition*)*, i32 (%struct.syntaxelement*, %struct.img_par*, %struct.datapartition*)** %18, align 4
99  %20 = call i32 %19(%struct.syntaxelement* undef, %struct.img_par* %img, %struct.datapartition* undef)
100  br i1 false, label %.loopexit, label %21
101
102; <label>:21                                      ; preds = %15
103  %22 = add i32 %coef_ctr.013, 1
104  %23 = add i32 %22, 0
105  %24 = getelementptr inbounds [2 x i8], [2 x i8]* %7, i32 %23, i32 0
106  %25 = add nsw i32 0, %11
107  %26 = getelementptr inbounds %struct.img_par, %struct.img_par* %img, i32 0, i32 27, i32 undef, i32 %25
108  store i32 0, i32* %26, align 4
109  %27 = add nsw i32 %k.014, 1
110  %28 = icmp slt i32 %27, 65
111  br i1 %28, label %.preheader11, label %.loopexit
112
113.preheader:                                       ; preds = %36, %9
114  %k.110 = phi i32 [ %45, %36 ], [ 0, %9 ]
115  %coef_ctr.29 = phi i32 [ %39, %36 ], [ -1, %9 ]
116  br i1 false, label %29, label %30
117
118; <label>:29                                      ; preds = %.preheader
119  br label %31
120
121; <label>:30                                      ; preds = %.preheader
122  br label %31
123
124; <label>:31                                      ; preds = %30, %29
125  %32 = getelementptr inbounds [0 x [20 x i32]], [0 x [20 x i32]]* @assignSE2partition, i32 0, i32 %1, i32 undef
126  %33 = load i32, i32* %32, align 4
127  %34 = getelementptr inbounds %struct.datapartition, %struct.datapartition* null, i32 %33
128  %35 = call i32 undef(%struct.syntaxelement* undef, %struct.img_par* %img, %struct.datapartition* %34)
129  br i1 false, label %.loopexit, label %36
130
131; <label>:36                                      ; preds = %31
132  %37 = load i32, i32* undef, align 4
133  %38 = add i32 %coef_ctr.29, 1
134  %39 = add i32 %38, %37
135  %40 = getelementptr inbounds [2 x i8], [2 x i8]* %7, i32 %39, i32 0
136  %41 = load i8, i8* %40, align 1
137  %42 = zext i8 %41 to i32
138  %43 = add nsw i32 %42, %11
139  %44 = getelementptr inbounds %struct.img_par, %struct.img_par* %img, i32 0, i32 27, i32 undef, i32 %43
140  store i32 0, i32* %44, align 4
141  %45 = add nsw i32 %k.110, 1
142  %46 = icmp slt i32 %45, 65
143  br i1 %46, label %.preheader, label %.loopexit
144
145.loopexit:                                        ; preds = %36, %31, %21, %15, %8
146  ret void
147}
148