; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt < %s -instcombine -S | FileCheck %s ; Should fold ; (%x + %y) u< %x ; or ; (%x + %y) u< %y ; to ; @llvm.uadd.with.overflow(%x, %y) + extractvalue ; ; All tests here have extra uses, to ensure that the pattern isn't perturbed. declare void @use8(i8) declare void @use2x8(<2 x i8>) define i1 @t0_basic(i8 %x, i8 %y) { ; CHECK-LABEL: @t0_basic( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ult i8 %t0, %y ret i1 %r } define <2 x i1> @t1_vec(<2 x i8> %x, <2 x i8> %y) { ; CHECK-LABEL: @t1_vec( ; CHECK-NEXT: [[T0:%.*]] = add <2 x i8> [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use2x8(<2 x i8> [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult <2 x i8> [[T0]], [[Y]] ; CHECK-NEXT: ret <2 x i1> [[R]] ; %t0 = add <2 x i8> %x, %y call void @use2x8(<2 x i8> %t0) %r = icmp ult <2 x i8> %t0, %y ret <2 x i1> %r } ; Commutativity define i1 @t2_symmetry(i8 %x, i8 %y) { ; CHECK-LABEL: @t2_symmetry( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[X]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ult i8 %t0, %x ; can check against either of `add` arguments ret i1 %r } declare i8 @gen8() define i1 @t3_commutative(i8 %x) { ; CHECK-LABEL: @t3_commutative( ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[T0:%.*]] = add i8 [[Y]], [[X:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %y = call i8 @gen8() %t0 = add i8 %y, %x ; swapped call void @use8(i8 %t0) %r = icmp ult i8 %t0, %y ret i1 %r } define i1 @t4_commutative(i8 %x, i8 %y) { ; CHECK-LABEL: @t4_commutative( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ugt i8 %y, %t0 ; swapped ret i1 %r } define i1 @t5_commutative(i8 %x) { ; CHECK-LABEL: @t5_commutative( ; CHECK-NEXT: [[Y:%.*]] = call i8 @gen8() ; CHECK-NEXT: [[T0:%.*]] = add i8 [[Y]], [[X:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[Y]], [[T0]] ; CHECK-NEXT: ret i1 [[R]] ; %y = call i8 @gen8() %t0 = add i8 %y, %x ; swapped call void @use8(i8 %t0) %r = icmp ugt i8 %y, %t0 ; swapped ret i1 %r } ; Extra-use tests define i1 @t6_no_extrause(i8 %x, i8 %y) { ; CHECK-LABEL: @t6_no_extrause( ; CHECK-NEXT: [[TMP1:%.*]] = xor i8 [[Y:%.*]], -1 ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[TMP1]], [[X:%.*]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y %r = icmp ult i8 %t0, %y ret i1 %r } ; Negative tests define i1 @n7_different_y(i8 %x, i8 %y0, i8 %y1) { ; CHECK-LABEL: @n7_different_y( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y0:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ult i8 [[T0]], [[Y1:%.*]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y0 call void @use8(i8 %t0) %r = icmp ult i8 %t0, %y1 ret i1 %r } define i1 @n8_wrong_pred0(i8 %x, i8 %y) { ; CHECK-LABEL: @n8_wrong_pred0( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ule i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ule i8 %t0, %y ret i1 %r } define i1 @n9_wrong_pred1(i8 %x, i8 %y) { ; CHECK-LABEL: @n9_wrong_pred1( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ugt i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ugt i8 %t0, %y ret i1 %r } define i1 @n10_wrong_pred2(i8 %x, i8 %y) { ; CHECK-LABEL: @n10_wrong_pred2( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp eq i8 [[X]], 0 ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp eq i8 %t0, %y ret i1 %r } define i1 @n11_wrong_pred3(i8 %x, i8 %y) { ; CHECK-LABEL: @n11_wrong_pred3( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp ne i8 [[X]], 0 ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp ne i8 %t0, %y ret i1 %r } define i1 @n12_wrong_pred4(i8 %x, i8 %y) { ; CHECK-LABEL: @n12_wrong_pred4( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp slt i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp slt i8 %t0, %y ret i1 %r } define i1 @n13_wrong_pred5(i8 %x, i8 %y) { ; CHECK-LABEL: @n13_wrong_pred5( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp sle i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp sle i8 %t0, %y ret i1 %r } define i1 @n14_wrong_pred6(i8 %x, i8 %y) { ; CHECK-LABEL: @n14_wrong_pred6( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp sgt i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp sgt i8 %t0, %y ret i1 %r } define i1 @n15_wrong_pred7(i8 %x, i8 %y) { ; CHECK-LABEL: @n15_wrong_pred7( ; CHECK-NEXT: [[T0:%.*]] = add i8 [[X:%.*]], [[Y:%.*]] ; CHECK-NEXT: call void @use8(i8 [[T0]]) ; CHECK-NEXT: [[R:%.*]] = icmp sge i8 [[T0]], [[Y]] ; CHECK-NEXT: ret i1 [[R]] ; %t0 = add i8 %x, %y call void @use8(i8 %t0) %r = icmp sge i8 %t0, %y ret i1 %r }