1 ; NOTE: Assertions have been autogenerated by update_test_checks.py 2 ; RUN: opt < %s -instsimplify -S | FileCheck %s 3 4 define i32 @add1(i32 %x) { 5 ; CHECK-LABEL: @add1( 6 ; CHECK: ret i32 %x 7 ; 8 ; (X + -1) + 1 -> X 9 %l = add i32 %x, -1 10 %r = add i32 %l, 1 11 ret i32 %r 12 } 13 14 define i32 @and1(i32 %x, i32 %y) { 15 ; CHECK-LABEL: @and1( 16 ; CHECK: [[L:%.*]] = and i32 %x, %y 17 ; CHECK-NEXT: ret i32 [[L]] 18 ; 19 ; (X & Y) & X -> X & Y 20 %l = and i32 %x, %y 21 %r = and i32 %l, %x 22 ret i32 %r 23 } 24 25 define i32 @and2(i32 %x, i32 %y) { 26 ; CHECK-LABEL: @and2( 27 ; CHECK: [[R:%.*]] = and i32 %x, %y 28 ; CHECK-NEXT: ret i32 [[R]] 29 ; 30 ; X & (X & Y) -> X & Y 31 %r = and i32 %x, %y 32 %l = and i32 %x, %r 33 ret i32 %l 34 } 35 36 define i32 @or1(i32 %x, i32 %y) { 37 ; CHECK-LABEL: @or1( 38 ; CHECK: [[L:%.*]] = or i32 %x, %y 39 ; CHECK-NEXT: ret i32 [[L]] 40 ; 41 ; (X | Y) | X -> X | Y 42 %l = or i32 %x, %y 43 %r = or i32 %l, %x 44 ret i32 %r 45 } 46 47 define i32 @or2(i32 %x, i32 %y) { 48 ; CHECK-LABEL: @or2( 49 ; CHECK: [[R:%.*]] = or i32 %x, %y 50 ; CHECK-NEXT: ret i32 [[R]] 51 ; 52 ; X | (X | Y) -> X | Y 53 %r = or i32 %x, %y 54 %l = or i32 %x, %r 55 ret i32 %l 56 } 57 58 define i32 @xor1(i32 %x, i32 %y) { 59 ; CHECK-LABEL: @xor1( 60 ; CHECK: ret i32 %y 61 ; 62 ; (X ^ Y) ^ X = Y 63 %l = xor i32 %x, %y 64 %r = xor i32 %l, %x 65 ret i32 %r 66 } 67 68 define i32 @xor2(i32 %x, i32 %y) { 69 ; CHECK-LABEL: @xor2( 70 ; CHECK: ret i32 %y 71 ; 72 ; X ^ (X ^ Y) = Y 73 %r = xor i32 %x, %y 74 %l = xor i32 %x, %r 75 ret i32 %l 76 } 77 78 define i32 @sub1(i32 %x, i32 %y) { 79 ; CHECK-LABEL: @sub1( 80 ; CHECK: ret i32 %y 81 ; 82 %d = sub i32 %x, %y 83 %r = sub i32 %x, %d 84 ret i32 %r 85 } 86 87 define i32 @sub2(i32 %x) { 88 ; CHECK-LABEL: @sub2( 89 ; CHECK: ret i32 -1 90 ; 91 ; X - (X + 1) -> -1 92 %xp1 = add i32 %x, 1 93 %r = sub i32 %x, %xp1 94 ret i32 %r 95 } 96 97 define i32 @sub3(i32 %x, i32 %y) { 98 ; CHECK-LABEL: @sub3( 99 ; CHECK: ret i32 %x 100 ; 101 ; ((X + 1) + Y) - (Y + 1) -> X 102 %xp1 = add i32 %x, 1 103 %lhs = add i32 %xp1, %y 104 %rhs = add i32 %y, 1 105 %r = sub i32 %lhs, %rhs 106 ret i32 %r 107 } 108 109 define i32 @sdiv1(i32 %x, i32 %y) { 110 ; CHECK-LABEL: @sdiv1( 111 ; CHECK: ret i32 %x 112 ; 113 ; (no overflow X * Y) / Y -> X 114 %mul = mul nsw i32 %x, %y 115 %r = sdiv i32 %mul, %y 116 ret i32 %r 117 } 118 119 define i32 @sdiv2(i32 %x, i32 %y) { 120 ; CHECK-LABEL: @sdiv2( 121 ; CHECK: [[DIV:%.*]] = sdiv i32 %x, %y 122 ; CHECK-NEXT: ret i32 [[DIV]] 123 ; 124 ; (((X / Y) * Y) / Y) -> X / Y 125 %div = sdiv i32 %x, %y 126 %mul = mul i32 %div, %y 127 %r = sdiv i32 %mul, %y 128 ret i32 %r 129 } 130 131 define i32 @sdiv3(i32 %x, i32 %y) { 132 ; CHECK-LABEL: @sdiv3( 133 ; CHECK: ret i32 0 134 ; 135 ; (X rem Y) / Y -> 0 136 %rem = srem i32 %x, %y 137 %div = sdiv i32 %rem, %y 138 ret i32 %div 139 } 140 141 define i32 @sdiv4(i32 %x, i32 %y) { 142 ; CHECK-LABEL: @sdiv4( 143 ; CHECK: ret i32 %x 144 ; 145 ; (X / Y) * Y -> X if the division is exact 146 %div = sdiv exact i32 %x, %y 147 %mul = mul i32 %div, %y 148 ret i32 %mul 149 } 150 151 define i32 @sdiv5(i32 %x, i32 %y) { 152 ; CHECK-LABEL: @sdiv5( 153 ; CHECK: ret i32 %x 154 ; 155 ; Y * (X / Y) -> X if the division is exact 156 %div = sdiv exact i32 %x, %y 157 %mul = mul i32 %y, %div 158 ret i32 %mul 159 } 160 161 162 define i32 @udiv1(i32 %x, i32 %y) { 163 ; CHECK-LABEL: @udiv1( 164 ; CHECK: ret i32 %x 165 ; 166 ; (no overflow X * Y) / Y -> X 167 %mul = mul nuw i32 %x, %y 168 %r = udiv i32 %mul, %y 169 ret i32 %r 170 } 171 172 define i32 @udiv2(i32 %x, i32 %y) { 173 ; CHECK-LABEL: @udiv2( 174 ; CHECK: [[DIV:%.*]] = udiv i32 %x, %y 175 ; CHECK-NEXT: ret i32 [[DIV]] 176 ; 177 ; (((X / Y) * Y) / Y) -> X / Y 178 %div = udiv i32 %x, %y 179 %mul = mul i32 %div, %y 180 %r = udiv i32 %mul, %y 181 ret i32 %r 182 } 183 184 define i32 @udiv3(i32 %x, i32 %y) { 185 ; CHECK-LABEL: @udiv3( 186 ; CHECK: ret i32 0 187 ; 188 ; (X rem Y) / Y -> 0 189 %rem = urem i32 %x, %y 190 %div = udiv i32 %rem, %y 191 ret i32 %div 192 } 193 194 define i32 @udiv4(i32 %x, i32 %y) { 195 ; CHECK-LABEL: @udiv4( 196 ; CHECK: ret i32 %x 197 ; 198 ; (X / Y) * Y -> X if the division is exact 199 %div = udiv exact i32 %x, %y 200 %mul = mul i32 %div, %y 201 ret i32 %mul 202 } 203 204 define i32 @udiv5(i32 %x, i32 %y) { 205 ; CHECK-LABEL: @udiv5( 206 ; CHECK: ret i32 %x 207 ; 208 ; Y * (X / Y) -> X if the division is exact 209 %div = udiv exact i32 %x, %y 210 %mul = mul i32 %y, %div 211 ret i32 %mul 212 } 213 214 define i16 @trunc1(i32 %x) { 215 ; CHECK-LABEL: @trunc1( 216 ; CHECK: ret i16 1 217 ; 218 %y = add i32 %x, 1 219 %tx = trunc i32 %x to i16 220 %ty = trunc i32 %y to i16 221 %d = sub i16 %ty, %tx 222 ret i16 %d 223 } 224