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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 u>= 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 uge 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 uge 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 uge <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 uge <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 uge <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 uge <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 uge <3 x i8> %tmp0, %x89 ret <3 x i1> %ret90}91 92; ============================================================================ ;93; Commutativity tests.94; ============================================================================ ;95 96declare i8 @gen8()97 98; The pattern is not commutative. instsimplify will already take care of it.99define i1 @c0() {100; CHECK-LABEL: @c0(101; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()102; CHECK-NEXT: ret i1 true103;104 %x = call i8 @gen8()105 %tmp0 = and i8 %x, 3106 %ret = icmp uge 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 uge 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: ret i1 true132;133 %x = call i8 @gen8()134 %tmp0 = lshr i8 -1, %y135 %tmp1 = and i8 %tmp0, %x136 %ret = icmp uge i8 %x, %tmp1 ; swapped order137 ret i1 %ret138}139 140define i1 @cv2(i8 %y) {141; CHECK-LABEL: @cv2(142; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()143; CHECK-NEXT: ret i1 true144;145 %x = call i8 @gen8()146 %tmp0 = lshr i8 -1, %y147 %tmp1 = and i8 %x, %tmp0 ; swapped order148 %ret = icmp uge i8 %x, %tmp1 ; swapped order149 ret i1 %ret150}151 152; ============================================================================ ;153; One-use tests. We don't care about multi-uses here.154; ============================================================================ ;155 156declare void @use8(i8)157 158define i1 @oneuse0(i8 %x) {159; CHECK-LABEL: @oneuse0(160; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3161; CHECK-NEXT: call void @use8(i8 [[TMP0]])162; CHECK-NEXT: [[RET:%.*]] = icmp ult i8 [[X]], 4163; CHECK-NEXT: ret i1 [[RET]]164;165 %tmp0 = and i8 %x, 3166 call void @use8(i8 %tmp0)167 %ret = icmp uge i8 %tmp0, %x168 ret i1 %ret169}170 171; ============================================================================ ;172; Negative tests173; ============================================================================ ;174 175define i1 @n0(i8 %x) {176; CHECK-LABEL: @n0(177; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X:%.*]], -5178; CHECK-NEXT: [[RET:%.*]] = icmp eq i8 [[TMP1]], 0179; CHECK-NEXT: ret i1 [[RET]]180;181 %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.182 %ret = icmp uge i8 %tmp0, %x183 ret i1 %ret184}185 186define i1 @n1(i8 %x, i8 %y, i8 %notx) {187; CHECK-LABEL: @n1(188; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X:%.*]], 3189; CHECK-NEXT: [[RET:%.*]] = icmp uge i8 [[TMP0]], [[NOTX:%.*]]190; CHECK-NEXT: ret i1 [[RET]]191;192 %tmp0 = and i8 %x, 3193 %ret = icmp uge i8 %tmp0, %notx ; not %x194 ret i1 %ret195}196 197define <2 x i1> @n2(<2 x i8> %x) {198; CHECK-LABEL: @n2(199; CHECK-NEXT: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -4, i8 -17>200; CHECK-NEXT: [[RET:%.*]] = icmp eq <2 x i8> [[TMP1]], zeroinitializer201; CHECK-NEXT: ret <2 x i1> [[RET]]202;203 %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.204 %ret = icmp uge <2 x i8> %tmp0, %x205 ret <2 x i1> %ret206}207