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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt < %s -passes=instcombine -S | FileCheck %s3 4; Should fold5; (%x + %y) u< %x6; or7; (%x + %y) u< %y8; to9; @llvm.uadd.with.overflow(%x, %y) + extractvalue10 11define i1 @t0_basic(i8 %x, i8 %y) {12; CHECK-LABEL: @t0_basic(13; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y:%.*]], -114; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X:%.*]], [[TMP1]]15; CHECK-NEXT: ret i1 [[R]]16;17 %t0 = add i8 %x, %y18 %r = icmp ult i8 %t0, %y19 ret i1 %r20}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:%.*]], splat (i8 -1)25; CHECK-NEXT: [[R:%.*]] = icmp ugt <2 x i8> [[X:%.*]], [[TMP1]]26; CHECK-NEXT: ret <2 x i1> [[R]]27;28 %t0 = add <2 x i8> %x, %y29 %r = icmp ult <2 x i8> %t0, %y30 ret <2 x i1> %r31}32 33; Commutativity34 35define i1 @t2_symmetry(i8 %x, i8 %y) {36; CHECK-LABEL: @t2_symmetry(37; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[X:%.*]], -138; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[Y:%.*]], [[TMP1]]39; CHECK-NEXT: ret i1 [[R]]40;41 %t0 = add i8 %x, %y42 %r = icmp ult i8 %t0, %x ; can check against either of `add` arguments43 ret i1 %r44}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]], -152; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X:%.*]], [[TMP1]]53; CHECK-NEXT: ret i1 [[R]]54;55 %y = call i8 @gen8()56 %t0 = add i8 %y, %x ; swapped57 %r = icmp ult i8 %t0, %y58 ret i1 %r59}60 61define i1 @t4_commutative(i8 %x, i8 %y) {62; CHECK-LABEL: @t4_commutative(63; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y:%.*]], -164; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X:%.*]], [[TMP1]]65; CHECK-NEXT: ret i1 [[R]]66;67 %t0 = add i8 %x, %y68 %r = icmp ugt i8 %y, %t0 ; swapped69 ret i1 %r70}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]], -176; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[X:%.*]], [[TMP1]]77; CHECK-NEXT: ret i1 [[R]]78;79 %y = call i8 @gen8()80 %t0 = add i8 %y, %x ; swapped81 %r = icmp ugt i8 %y, %t0 ; swapped82 ret i1 %r83}84 85; Extra-use tests86 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 ult i8 [[T0]], [[Y]]94; CHECK-NEXT: ret i1 [[R]]95;96 %t0 = add i8 %x, %y97 call void @use8(i8 %t0)98 %r = icmp ult i8 %t0, %y99 ret i1 %r100}101 102; Negative tests103 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 ult i8 [[T0]], [[Y1:%.*]]108; CHECK-NEXT: ret i1 [[R]]109;110 %t0 = add i8 %x, %y0111 %r = icmp ult i8 %t0, %y1112 ret i1 %r113}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, %y122 %r = icmp ule i8 %t0, %y123 ret i1 %r124}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, %y133 %r = icmp ugt i8 %t0, %y134 ret i1 %r135}136 137define i1 @n10_wrong_pred2(i8 %x, i8 %y) {138; CHECK-LABEL: @n10_wrong_pred2(139; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[X:%.*]], 0140; CHECK-NEXT: ret i1 [[R]]141;142 %t0 = add i8 %x, %y143 %r = icmp eq i8 %t0, %y144 ret i1 %r145}146 147define i1 @n11_wrong_pred3(i8 %x, i8 %y) {148; CHECK-LABEL: @n11_wrong_pred3(149; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[X:%.*]], 0150; CHECK-NEXT: ret i1 [[R]]151;152 %t0 = add i8 %x, %y153 %r = icmp ne i8 %t0, %y154 ret i1 %r155}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, %y164 %r = icmp slt i8 %t0, %y165 ret i1 %r166}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, %y175 %r = icmp sle i8 %t0, %y176 ret i1 %r177}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, %y186 %r = icmp sgt i8 %t0, %y187 ret i1 %r188}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, %y197 %r = icmp sge i8 %t0, %y198 ret i1 %r199}200