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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; https://bugs.llvm.org/show_bug.cgi?id=381235 6; Pattern:7; x & C == x8; Should be transformed into:9; x u<= C10; Iff: isPowerOf2(C + 1)11; C can be 0 and -1.12 13; ============================================================================ ;14; Basic positive tests15; ============================================================================ ;16 17define i1 @p0(i8 %x) {18; CHECK-LABEL: @p0(19; CHECK-NEXT: [[RET:%.*]] = icmp ult i8 [[X:%.*]], 420; CHECK-NEXT: ret i1 [[RET]]21;22 %tmp0 = and i8 %x, 323 %ret = icmp eq i8 %tmp0, %x24 ret i1 %ret25}26 27define i1 @pv(i8 %x, i8 %y) {28; CHECK-LABEL: @pv(29; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]30; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X:%.*]], [[TMP0]]31; CHECK-NEXT: ret i1 [[RET]]32;33 %tmp0 = lshr i8 -1, %y34 %tmp1 = and i8 %tmp0, %x35 %ret = icmp eq i8 %tmp1, %x36 ret i1 %ret37}38 39; ============================================================================ ;40; Vector tests41; ============================================================================ ;42 43define <2 x i1> @p1_vec_splat(<2 x i8> %x) {44; CHECK-LABEL: @p1_vec_splat(45; CHECK-NEXT: [[RET:%.*]] = icmp ult <2 x i8> [[X:%.*]], splat (i8 4)46; CHECK-NEXT: ret <2 x i1> [[RET]]47;48 %tmp0 = and <2 x i8> %x, <i8 3, i8 3>49 %ret = icmp eq <2 x i8> %tmp0, %x50 ret <2 x i1> %ret51}52 53define <2 x i1> @p2_vec_nonsplat(<2 x i8> %x) {54; CHECK-LABEL: @p2_vec_nonsplat(55; CHECK-NEXT: [[RET:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 16>56; CHECK-NEXT: ret <2 x i1> [[RET]]57;58 %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.59 %ret = icmp eq <2 x i8> %tmp0, %x60 ret <2 x i1> %ret61}62 63define <2 x i1> @p2_vec_nonsplat_edgecase0(<2 x i8> %x) {64; CHECK-LABEL: @p2_vec_nonsplat_edgecase0(65; CHECK-NEXT: [[RET:%.*]] = icmp ult <2 x i8> [[X:%.*]], <i8 4, i8 1>66; CHECK-NEXT: ret <2 x i1> [[RET]]67;68 %tmp0 = and <2 x i8> %x, <i8 3, i8 0>69 %ret = icmp eq <2 x i8> %tmp0, %x70 ret <2 x i1> %ret71}72define <2 x i1> @p2_vec_nonsplat_edgecase1(<2 x i8> %x) {73; CHECK-LABEL: @p2_vec_nonsplat_edgecase1(74; CHECK-NEXT: [[RET:%.*]] = icmp ule <2 x i8> [[X:%.*]], <i8 3, i8 -1>75; CHECK-NEXT: ret <2 x i1> [[RET]]76;77 %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>78 %ret = icmp eq <2 x i8> %tmp0, %x79 ret <2 x i1> %ret80}81 82define <3 x i1> @p3_vec_splat_poison(<3 x i8> %x) {83; CHECK-LABEL: @p3_vec_splat_poison(84; CHECK-NEXT: [[RET:%.*]] = icmp ult <3 x i8> [[X:%.*]], splat (i8 4)85; CHECK-NEXT: ret <3 x i1> [[RET]]86;87 %tmp0 = and <3 x i8> %x, <i8 3, i8 poison, i8 3>88 %ret = icmp eq <3 x i8> %tmp0, %x89 ret <3 x i1> %ret90}91 92; ============================================================================ ;93; Commutativity tests.94; ============================================================================ ;95 96declare i8 @gen8()97 98define i1 @c0() {99; CHECK-LABEL: @c0(100; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()101; CHECK-NEXT: [[RET:%.*]] = icmp ult i8 [[X]], 4102; CHECK-NEXT: ret i1 [[RET]]103;104 %x = call i8 @gen8()105 %tmp0 = and i8 %x, 3106 %ret = icmp eq i8 %x, %tmp0 ; swapped order107 ret i1 %ret108}109 110; ============================================================================ ;111; Commutativity tests with variable112; ============================================================================ ;113 114define i1 @cv0(i8 %y) {115; CHECK-LABEL: @cv0(116; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()117; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]118; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]119; CHECK-NEXT: ret i1 [[RET]]120;121 %x = call i8 @gen8()122 %tmp0 = lshr i8 -1, %y123 %tmp1 = and i8 %x, %tmp0 ; swapped order124 %ret = icmp eq i8 %tmp1, %x125 ret i1 %ret126}127 128define i1 @cv1(i8 %y) {129; CHECK-LABEL: @cv1(130; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()131; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]132; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]133; CHECK-NEXT: ret i1 [[RET]]134;135 %x = call i8 @gen8()136 %tmp0 = lshr i8 -1, %y137 %tmp1 = and i8 %tmp0, %x138 %ret = icmp eq i8 %x, %tmp1 ; swapped order139 ret i1 %ret140}141 142define i1 @cv2(i8 %y) {143; CHECK-LABEL: @cv2(144; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()145; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]146; CHECK-NEXT: [[RET:%.*]] = icmp ule i8 [[X]], [[TMP0]]147; CHECK-NEXT: ret i1 [[RET]]148;149 %x = call i8 @gen8()150 %tmp0 = lshr i8 -1, %y151 %tmp1 = and i8 %x, %tmp0 ; swapped order152 %ret = icmp eq i8 %x, %tmp1 ; swapped order153 ret i1 %ret154}155 156; ============================================================================ ;157; One-use tests. We don't care about multi-uses here.158; ============================================================================ ;159 160declare void @use8(i8)161 162define i1 @oneuse0(i8 %x) {163; CHECK-LABEL: @oneuse0(164; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3165; CHECK-NEXT: call void @use8(i8 [[TMP0]])166; CHECK-NEXT: [[RET:%.*]] = icmp ult i8 [[X]], 4167; CHECK-NEXT: ret i1 [[RET]]168;169 %tmp0 = and i8 %x, 3170 call void @use8(i8 %tmp0)171 %ret = icmp eq i8 %tmp0, %x172 ret i1 %ret173}174 175; ============================================================================ ;176; Negative tests177; ============================================================================ ;178 179define i1 @n0(i8 %x) {180; CHECK-LABEL: @n0(181; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X:%.*]], -5182; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP1]], 0183; CHECK-NEXT: ret i1 [[RET]]184;185 %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.186 %ret = icmp eq i8 %tmp0, %x187 ret i1 %ret188}189 190define i1 @n1(i8 %x, i8 %y, i8 %notx) {191; CHECK-LABEL: @n1(192; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3193; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP0]], [[NOTX:%.*]]194; CHECK-NEXT: ret i1 [[RET]]195;196 %tmp0 = and i8 %x, 3197 %ret = icmp eq i8 %tmp0, %notx ; not %x198 ret i1 %ret199}200 201define <2 x i1> @n2(<2 x i8> %x) {202; CHECK-LABEL: @n2(203; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -4, i8 -17>204; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP1]], zeroinitializer205; CHECK-NEXT: ret <2 x i1> [[RET]]206;207 %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.208 %ret = icmp eq <2 x i8> %tmp0, %x209 ret <2 x i1> %ret210}211