1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt < %s -instcombine -S | FileCheck %s 3 4; Should fold 5; (%x + %y) u>= %x 6; or 7; (%x + %y) u>= %y 8; to 9; @llvm.uadd.with.overflow(%x, %y) + extractvalue + not 10 11define i1 @t0_basic(i8 %x, i8 %y) { 12; CHECK-LABEL: @t0_basic( 13; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y:%.*]], -1 14; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[TMP1]], [[X:%.*]] 15; CHECK-NEXT: ret i1 [[R]] 16; 17 %t0 = add i8 %x, %y 18 %r = icmp uge i8 %t0, %y 19 ret i1 %r 20} 21 22define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) { 23; CHECK-LABEL: @t1_vec( 24; CHECK-NEXT: [[TMP1:%.*]] = xor <2 x i8> [[Y:%.*]], <i8 -1, i8 -1> 25; CHECK-NEXT: [[R:%.*]] = icmp uge <2 x i8> [[TMP1]], [[X:%.*]] 26; CHECK-NEXT: ret <2 x i1> [[R]] 27; 28 %t0 = add <2 x i8> %x, %y 29 %r = icmp uge <2 x i8> %t0, %y 30 ret <2 x i1> %r 31} 32 33; Commutativity 34 35define i1 @t2_symmetry(i8 %x, i8 %y) { 36; CHECK-LABEL: @t2_symmetry( 37; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X:%.*]], -1 38; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[TMP1]], [[Y:%.*]] 39; CHECK-NEXT: ret i1 [[R]] 40; 41 %t0 = add i8 %x, %y 42 %r = icmp uge i8 %t0, %x ; can check against either of `add` arguments 43 ret i1 %r 44} 45 46declare i8 @gen8() 47 48define i1 @t3_commutative(i8 %x) { 49; CHECK-LABEL: @t3_commutative( 50; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() 51; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y]], -1 52; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[TMP1]], [[X:%.*]] 53; CHECK-NEXT: ret i1 [[R]] 54; 55 %y = call i8 @gen8() 56 %t0 = add i8 %y, %x ; swapped 57 %r = icmp uge i8 %t0, %y 58 ret i1 %r 59} 60 61define i1 @t4_commutative(i8 %x, i8 %y) { 62; CHECK-LABEL: @t4_commutative( 63; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y:%.*]], -1 64; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[TMP1]], [[X:%.*]] 65; CHECK-NEXT: ret i1 [[R]] 66; 67 %t0 = add i8 %x, %y 68 %r = icmp ule i8 %y, %t0 ; swapped 69 ret i1 %r 70} 71 72define i1 @t5_commutative(i8 %x) { 73; CHECK-LABEL: @t5_commutative( 74; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() 75; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y]], -1 76; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[TMP1]], [[X:%.*]] 77; CHECK-NEXT: ret i1 [[R]] 78; 79 %y = call i8 @gen8() 80 %t0 = add i8 %y, %x ; swapped 81 %r = icmp ule i8 %y, %t0 ; swapped 82 ret i1 %r 83} 84 85; Extra-use tests 86 87declare void @use8(i8) 88 89define i1 @t6_extrause(i8 %x, i8 %y) { 90; CHECK-LABEL: @t6_extrause( 91; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 92; CHECK-NEXT: call void @use8(i8 [[T0]]) 93; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[T0]], [[Y]] 94; CHECK-NEXT: ret i1 [[R]] 95; 96 %t0 = add i8 %x, %y 97 call void @use8(i8 %t0) 98 %r = icmp uge i8 %t0, %y 99 ret i1 %r 100} 101 102; Negative tests 103 104define i1 @n7_different_y(i8 %x, i8 %y0, i8 %y1) { 105; CHECK-LABEL: @n7_different_y( 106; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y0:%.*]] 107; CHECK-NEXT: [[R:%.*]] = icmp uge i8 [[T0]], [[Y1:%.*]] 108; CHECK-NEXT: ret i1 [[R]] 109; 110 %t0 = add i8 %x, %y0 111 %r = icmp uge i8 %t0, %y1 112 ret i1 %r 113} 114 115define i1 @n8_wrong_pred0(i8 %x, i8 %y) { 116; CHECK-LABEL: @n8_wrong_pred0( 117; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 118; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[T0]], [[Y]] 119; CHECK-NEXT: ret i1 [[R]] 120; 121 %t0 = add i8 %x, %y 122 %r = icmp ule i8 %t0, %y 123 ret i1 %r 124} 125 126define i1 @n9_wrong_pred1(i8 %x, i8 %y) { 127; CHECK-LABEL: @n9_wrong_pred1( 128; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 129; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[T0]], [[Y]] 130; CHECK-NEXT: ret i1 [[R]] 131; 132 %t0 = add i8 %x, %y 133 %r = icmp ugt i8 %t0, %y 134 ret i1 %r 135} 136 137define i1 @n10_wrong_pred2(i8 %x, i8 %y) { 138; CHECK-LABEL: @n10_wrong_pred2( 139; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[X:%.*]], 0 140; CHECK-NEXT: ret i1 [[R]] 141; 142 %t0 = add i8 %x, %y 143 %r = icmp eq i8 %t0, %y 144 ret i1 %r 145} 146 147define i1 @n11_wrong_pred3(i8 %x, i8 %y) { 148; CHECK-LABEL: @n11_wrong_pred3( 149; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[X:%.*]], 0 150; CHECK-NEXT: ret i1 [[R]] 151; 152 %t0 = add i8 %x, %y 153 %r = icmp ne i8 %t0, %y 154 ret i1 %r 155} 156 157define i1 @n12_wrong_pred4(i8 %x, i8 %y) { 158; CHECK-LABEL: @n12_wrong_pred4( 159; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 160; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[T0]], [[Y]] 161; CHECK-NEXT: ret i1 [[R]] 162; 163 %t0 = add i8 %x, %y 164 %r = icmp slt i8 %t0, %y 165 ret i1 %r 166} 167 168define i1 @n13_wrong_pred5(i8 %x, i8 %y) { 169; CHECK-LABEL: @n13_wrong_pred5( 170; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 171; CHECK-NEXT: [[R:%.*]] = icmp sle i8 [[T0]], [[Y]] 172; CHECK-NEXT: ret i1 [[R]] 173; 174 %t0 = add i8 %x, %y 175 %r = icmp sle i8 %t0, %y 176 ret i1 %r 177} 178 179define i1 @n14_wrong_pred6(i8 %x, i8 %y) { 180; CHECK-LABEL: @n14_wrong_pred6( 181; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 182; CHECK-NEXT: [[R:%.*]] = icmp sgt i8 [[T0]], [[Y]] 183; CHECK-NEXT: ret i1 [[R]] 184; 185 %t0 = add i8 %x, %y 186 %r = icmp sgt i8 %t0, %y 187 ret i1 %r 188} 189 190define i1 @n15_wrong_pred7(i8 %x, i8 %y) { 191; CHECK-LABEL: @n15_wrong_pred7( 192; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] 193; CHECK-NEXT: [[R:%.*]] = icmp sge i8 [[T0]], [[Y]] 194; CHECK-NEXT: ret i1 [[R]] 195; 196 %t0 = add i8 %x, %y 197 %r = icmp sge i8 %t0, %y 198 ret i1 %r 199} 200