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147
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1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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2 ; RUN: opt %s -instcombine -S | FileCheck %s
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3
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4 ; Fold
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5 ; ((%x * %y) u/ %x) != %y
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6 ; to
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7 ; @llvm.umul.with.overflow(%x, %y) + extractvalue
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8
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9 define i1 @t0_basic(i8 %x, i8 %y) {
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10 ; CHECK-LABEL: @t0_basic(
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11 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
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12 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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13 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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14 ; CHECK-NEXT: ret i1 [[R]]
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15 ;
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16 %t0 = mul i8 %x, %y
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17 %t1 = udiv i8 %t0, %x
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18 %r = icmp ne i8 %t1, %y
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19 ret i1 %r
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20 }
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21
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22 define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) {
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23 ; CHECK-LABEL: @t1_vec(
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24 ; CHECK-NEXT: [[T0:%.*]] = mul <2 x i8> [[X:%.*]], [[Y:%.*]]
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25 ; CHECK-NEXT: [[T1:%.*]] = udiv <2 x i8> [[T0]], [[X]]
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26 ; CHECK-NEXT: [[R:%.*]] = icmp ne <2 x i8> [[T1]], [[Y]]
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27 ; CHECK-NEXT: ret <2 x i1> [[R]]
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28 ;
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29 %t0 = mul <2 x i8> %x, %y
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30 %t1 = udiv <2 x i8> %t0, %x
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31 %r = icmp ne <2 x i8> %t1, %y
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32 ret <2 x i1> %r
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33 }
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34
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35 declare i8 @gen8()
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36
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37 define i1 @t2_commutative(i8 %x) {
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38 ; CHECK-LABEL: @t2_commutative(
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39 ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
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40 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[Y]], [[X:%.*]]
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41 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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42 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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43 ; CHECK-NEXT: ret i1 [[R]]
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44 ;
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45 %y = call i8 @gen8()
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46 %t0 = mul i8 %y, %x ; swapped
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47 %t1 = udiv i8 %t0, %x
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48 %r = icmp ne i8 %t1, %y
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49 ret i1 %r
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50 }
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51
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52 define i1 @t3_commutative(i8 %x) {
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53 ; CHECK-LABEL: @t3_commutative(
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54 ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
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55 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[Y]], [[X:%.*]]
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56 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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57 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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58 ; CHECK-NEXT: ret i1 [[R]]
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59 ;
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60 %y = call i8 @gen8()
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61 %t0 = mul i8 %y, %x ; swapped
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62 %t1 = udiv i8 %t0, %x
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63 %r = icmp ne i8 %t1, %y
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64 ret i1 %r
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65 }
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66
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67 define i1 @t4_commutative(i8 %x) {
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68 ; CHECK-LABEL: @t4_commutative(
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69 ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8()
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70 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[Y]], [[X:%.*]]
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71 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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72 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[Y]], [[T1]]
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73 ; CHECK-NEXT: ret i1 [[R]]
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74 ;
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75 %y = call i8 @gen8()
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76 %t0 = mul i8 %y, %x ; swapped
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77 %t1 = udiv i8 %t0, %x
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78 %r = icmp ne i8 %y, %t1 ; swapped
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79 ret i1 %r
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80 }
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81
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82 ; Extra-use tests
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83
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84 declare void @use8(i8)
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85
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86 define i1 @t5_extrause0(i8 %x, i8 %y) {
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87 ; CHECK-LABEL: @t5_extrause0(
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88 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
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89 ; CHECK-NEXT: call void @use8(i8 [[T0]])
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90 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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91 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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92 ; CHECK-NEXT: ret i1 [[R]]
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93 ;
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94 %t0 = mul i8 %x, %y
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95 call void @use8(i8 %t0)
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96 %t1 = udiv i8 %t0, %x
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97 %r = icmp ne i8 %t1, %y
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98 ret i1 %r
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99 }
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100
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101 define i1 @t6_extrause1(i8 %x, i8 %y) {
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102 ; CHECK-LABEL: @t6_extrause1(
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103 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
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104 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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105 ; CHECK-NEXT: call void @use8(i8 [[T1]])
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106 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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107 ; CHECK-NEXT: ret i1 [[R]]
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108 ;
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109 %t0 = mul i8 %x, %y
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110 %t1 = udiv i8 %t0, %x
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111 call void @use8(i8 %t1)
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112 %r = icmp ne i8 %t1, %y
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113 ret i1 %r
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114 }
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115
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116 define i1 @t7_extrause2(i8 %x, i8 %y) {
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117 ; CHECK-LABEL: @t7_extrause2(
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118 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
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119 ; CHECK-NEXT: call void @use8(i8 [[T0]])
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120 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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121 ; CHECK-NEXT: call void @use8(i8 [[T1]])
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122 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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123 ; CHECK-NEXT: ret i1 [[R]]
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124 ;
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125 %t0 = mul i8 %x, %y
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126 call void @use8(i8 %t0)
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127 %t1 = udiv i8 %t0, %x
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128 call void @use8(i8 %t1)
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129 %r = icmp ne i8 %t1, %y
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130 ret i1 %r
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131 }
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132
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133 ; Negative tests
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134
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135 define i1 @n8_different_x(i8 %x0, i8 %x1, i8 %y) {
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136 ; CHECK-LABEL: @n8_different_x(
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137 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X0:%.*]], [[Y:%.*]]
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138 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X1:%.*]]
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139 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y]]
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140 ; CHECK-NEXT: ret i1 [[R]]
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141 ;
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142 %t0 = mul i8 %x0, %y
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143 %t1 = udiv i8 %t0, %x1
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144 %r = icmp ne i8 %t1, %y
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145 ret i1 %r
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146 }
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147
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148 define i1 @n9_different_y(i8 %x, i8 %y0, i8 %y1) {
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149 ; CHECK-LABEL: @n9_different_y(
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150 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y0:%.*]]
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151 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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152 ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[T1]], [[Y1:%.*]]
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153 ; CHECK-NEXT: ret i1 [[R]]
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154 ;
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155 %t0 = mul i8 %x, %y0
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156 %t1 = udiv i8 %t0, %x
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157 %r = icmp ne i8 %t1, %y1
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158 ret i1 %r
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159 }
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160
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161 define i1 @n10_wrong_pred(i8 %x, i8 %y) {
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162 ; CHECK-LABEL: @n10_wrong_pred(
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163 ; CHECK-NEXT: [[T0:%.*]] = mul i8 [[X:%.*]], [[Y:%.*]]
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164 ; CHECK-NEXT: [[T1:%.*]] = udiv i8 [[T0]], [[X]]
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165 ; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[T1]], [[Y]]
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166 ; CHECK-NEXT: ret i1 [[R]]
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167 ;
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168 %t0 = mul i8 %x, %y
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169 %t1 = udiv i8 %t0, %x
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170 %r = icmp ugt i8 %t1, %y
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171 ret i1 %r
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172 }
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