1 ; This test makes sure that urem instructions are properly eliminated. 2 ; 3 ; RUN: opt < %s -instcombine -S | FileCheck %s 4 ; END. 5 6 define i32 @test1(i32 %A) { 7 ; CHECK-LABEL: @test1( 8 ; CHECK-NEXT: ret i32 0 9 %B = srem i32 %A, 1 ; ISA constant 0 10 ret i32 %B 11 } 12 13 define i32 @test2(i32 %A) { ; 0 % X = 0, we don't need to preserve traps 14 ; CHECK-LABEL: @test2( 15 ; CHECK-NEXT: ret i32 0 16 %B = srem i32 0, %A 17 ret i32 %B 18 } 19 20 define i32 @test3(i32 %A) { 21 ; CHECK-LABEL: @test3( 22 ; CHECK-NEXT: [[AND:%.*]] = and i32 %A, 7 23 ; CHECK-NEXT: ret i32 [[AND]] 24 %B = urem i32 %A, 8 25 ret i32 %B 26 } 27 28 define i1 @test3a(i32 %A) { 29 ; CHECK-LABEL: @test3a( 30 ; CHECK-NEXT: [[AND:%.*]] = and i32 %A, 7 31 ; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[AND]], 0 32 ; CHECK-NEXT: ret i1 [[CMP]] 33 %B = srem i32 %A, -8 34 %C = icmp ne i32 %B, 0 35 ret i1 %C 36 } 37 38 define i32 @test4(i32 %X, i1 %C) { 39 ; CHECK-LABEL: @test4( 40 ; CHECK-NEXT: [[SEL:%.*]] = select i1 %C, i32 0, i32 7 41 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[SEL]], %X 42 %V = select i1 %C, i32 1, i32 8 43 %R = urem i32 %X, %V 44 ret i32 %R 45 } 46 47 define i32 @test5(i32 %X, i8 %B) { 48 ; CHECK-LABEL: @test5( 49 ; CHECK-NEXT: [[ZEXT:%.*]] = zext i8 %B to i32 50 ; CHECK-NEXT: [[SHL:%.*]] = shl nuw i32 32, [[ZEXT]] 51 ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[SHL]], -1 52 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[ADD]], %X 53 ; CHECK-NEXT: ret i32 [[AND]] 54 %shift.upgrd.1 = zext i8 %B to i32 55 %Amt = shl i32 32, %shift.upgrd.1 56 %V = urem i32 %X, %Amt 57 ret i32 %V 58 } 59 60 define i32 @test6(i32 %A) { 61 ; CHECK-LABEL: @test6( 62 ; CHECK-NEXT: ret i32 undef 63 %B = srem i32 %A, 0 ;; undef 64 ret i32 %B 65 } 66 67 define i32 @test7(i32 %A) { 68 ; CHECK-LABEL: @test7( 69 ; CHECK-NEXT: ret i32 0 70 %B = mul i32 %A, 8 71 %C = srem i32 %B, 4 72 ret i32 %C 73 } 74 75 define i32 @test8(i32 %A) { 76 ; CHECK-LABEL: @test8( 77 ; CHECK-NEXT: ret i32 0 78 %B = shl i32 %A, 4 79 %C = srem i32 %B, 8 80 ret i32 %C 81 } 82 83 define i32 @test9(i32 %A) { 84 ; CHECK-LABEL: @test9( 85 ; CHECK-NEXT: ret i32 0 86 %B = mul i32 %A, 64 87 %C = urem i32 %B, 32 88 ret i32 %C 89 } 90 91 define i32 @test10(i8 %c) { 92 ; CHECK-LABEL: @test10( 93 ; CHECK-NEXT: ret i32 0 94 %tmp.1 = zext i8 %c to i32 95 %tmp.2 = mul i32 %tmp.1, 4 96 %tmp.3 = sext i32 %tmp.2 to i64 97 %tmp.5 = urem i64 %tmp.3, 4 98 %tmp.6 = trunc i64 %tmp.5 to i32 99 ret i32 %tmp.6 100 } 101 102 define i32 @test11(i32 %i) { 103 ; CHECK-LABEL: @test11( 104 ; CHECK-NEXT: ret i32 0 105 %tmp.1 = and i32 %i, -2 106 %tmp.3 = mul i32 %tmp.1, 2 107 %tmp.5 = urem i32 %tmp.3, 4 108 ret i32 %tmp.5 109 } 110 111 define i32 @test12(i32 %i) { 112 ; CHECK-LABEL: @test12( 113 ; CHECK-NEXT: ret i32 0 114 %tmp.1 = and i32 %i, -4 115 %tmp.5 = srem i32 %tmp.1, 2 116 ret i32 %tmp.5 117 } 118 119 define i32 @test13(i32 %i) { 120 ; CHECK-LABEL: @test13( 121 ; CHECK-NEXT: ret i32 0 122 %x = srem i32 %i, %i 123 ret i32 %x 124 } 125 126 define i64 @test14(i64 %x, i32 %y) { 127 ; CHECK-LABEL: @test14( 128 ; CHECK-NEXT: [[SHL:%.*]] = shl i32 1, %y 129 ; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[SHL]] to i64 130 ; CHECK-NEXT: [[ADD:%.*]] = add i64 [[ZEXT]], -1 131 ; CHECK-NEXT: [[AND:%.*]] = and i64 [[ADD]], %x 132 ; CHECK-NEXT: ret i64 [[AND]] 133 %shl = shl i32 1, %y 134 %zext = zext i32 %shl to i64 135 %urem = urem i64 %x, %zext 136 ret i64 %urem 137 } 138 139 define i64 @test15(i32 %x, i32 %y) { 140 ; CHECK-LABEL: @test15( 141 ; CHECK-NEXT: [[SHL:%.*]] = shl nuw i32 1, %y 142 ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[SHL]], -1 143 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[ADD]], %x 144 ; CHECK-NEXT: [[ZEXT:%.*]] = zext i32 [[AND]] to i64 145 ; CHECK-NEXT: ret i64 [[ZEXT]] 146 %shl = shl i32 1, %y 147 %zext0 = zext i32 %shl to i64 148 %zext1 = zext i32 %x to i64 149 %urem = urem i64 %zext1, %zext0 150 ret i64 %urem 151 } 152 153 define i32 @test16(i32 %x, i32 %y) { 154 ; CHECK-LABEL: @test16( 155 ; CHECK-NEXT: [[SHR:%.*]] = lshr i32 %y, 11 156 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[SHR]], 4 157 ; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], 3 158 ; CHECK-NEXT: [[REM:%.*]] = and i32 [[OR]], %x 159 ; CHECK-NEXT: ret i32 [[REM]] 160 %shr = lshr i32 %y, 11 161 %and = and i32 %shr, 4 162 %add = add i32 %and, 4 163 %rem = urem i32 %x, %add 164 ret i32 %rem 165 } 166 167 define i32 @test17(i32 %X) { 168 ; CHECK-LABEL: @test17( 169 ; CHECK-NEXT: icmp ne i32 %X, 1 170 ; CHECK-NEXT: zext i1 171 ; CHECK-NEXT: ret 172 %A = urem i32 1, %X 173 ret i32 %A 174 } 175 176 define i32 @test18(i16 %x, i32 %y) { 177 ; CHECK: @test18 178 ; CHECK-NEXT: [[AND:%.*]] = and i16 %x, 4 179 ; CHECK-NEXT: [[EXT:%.*]] = zext i16 [[AND]] to i32 180 ; CHECK-NEXT: [[SHL:%.*]] = shl nuw nsw i32 [[EXT]], 3 181 ; CHECK-NEXT: [[XOR:%.*]] = xor i32 [[SHL]], 63 182 ; CHECK-NEXT: [[REM:%.*]] = and i32 [[XOR]], %y 183 ; CHECK-NEXT: ret i32 [[REM]] 184 %1 = and i16 %x, 4 185 %2 = icmp ne i16 %1, 0 186 %3 = select i1 %2, i32 32, i32 64 187 %4 = urem i32 %y, %3 188 ret i32 %4 189 } 190 191 define i32 @test19(i32 %x, i32 %y) { 192 ; CHECK: @test19 193 ; CHECK-NEXT: [[SHL1:%.*]] = shl i32 1, %x 194 ; CHECK-NEXT: [[SHL2:%.*]] = shl i32 1, %y 195 ; CHECK-NEXT: [[AND:%.*]] = and i32 [[SHL1]], [[SHL2]] 196 ; CHECK-NEXT: [[ADD:%.*]] = add i32 [[AND]], [[SHL1]] 197 ; CHECK-NEXT: [[SUB:%.*]] = add i32 [[ADD]], -1 198 ; CHECK-NEXT: [[REM:%.*]] = and i32 [[SUB]], %y 199 ; CHECK-NEXT: ret i32 [[REM]] 200 %A = shl i32 1, %x 201 %B = shl i32 1, %y 202 %C = and i32 %A, %B 203 %D = add i32 %C, %A 204 %E = urem i32 %y, %D 205 ret i32 %E 206 } 207
