1; This test makes sure that urem instructions are properly eliminated. 2; 3; RUN: opt < %s -instcombine -S | FileCheck %s 4; END. 5 6define 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 13define 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 20define 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 28define 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 38define 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 47define 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 60define 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 67define 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 75define 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 83define 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 91define 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 102define 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 111define 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 119define 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 126define 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 nsw 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 139define 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 153define 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 167define 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 176define 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 191define 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 208define <2 x i64> @test20(<2 x i64> %X, <2 x i1> %C) { 209; CHECK-LABEL: @test20( 210; CHECK-NEXT: select <2 x i1> %C, <2 x i64> <i64 1, i64 2>, <2 x i64> zeroinitializer 211; CHECK-NEXT: ret <2 x i64> 212 %V = select <2 x i1> %C, <2 x i64> <i64 1, i64 2>, <2 x i64> <i64 8, i64 9> 213 %R = urem <2 x i64> %V, <i64 2, i64 3> 214 ret <2 x i64> %R 215} 216