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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 s> x & C8; Should be transformed into:9; x s> C10; Iff: isPowerOf2(C + 1)11; C must not be -1, but may be 0.12 13; NOTE: this pattern is not commutative!14 15declare i8 @gen8()16declare <2 x i8> @gen2x8()17declare <3 x i8> @gen3x8()18 19; ============================================================================ ;20; Basic positive tests21; ============================================================================ ;22 23define i1 @p0() {24; CHECK-LABEL: @p0(25; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()26; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], 327; CHECK-NEXT: ret i1 [[RET]]28;29 %x = call i8 @gen8()30 %tmp0 = and i8 %x, 331 %ret = icmp sgt i8 %x, %tmp032 ret i1 %ret33}34 35; ============================================================================ ;36; Vector tests37; ============================================================================ ;38 39define <2 x i1> @p1_vec_splat() {40; CHECK-LABEL: @p1_vec_splat(41; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()42; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], splat (i8 3)43; CHECK-NEXT: ret <2 x i1> [[RET]]44;45 %x = call <2 x i8> @gen2x8()46 %tmp0 = and <2 x i8> %x, <i8 3, i8 3>47 %ret = icmp sgt <2 x i8> %x, %tmp048 ret <2 x i1> %ret49}50 51define <2 x i1> @p2_vec_nonsplat() {52; CHECK-LABEL: @p2_vec_nonsplat(53; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()54; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], <i8 3, i8 15>55; CHECK-NEXT: ret <2 x i1> [[RET]]56;57 %x = call <2 x i8> @gen2x8()58 %tmp0 = and <2 x i8> %x, <i8 3, i8 15> ; doesn't have to be splat.59 %ret = icmp sgt <2 x i8> %x, %tmp060 ret <2 x i1> %ret61}62 63define <2 x i1> @p2_vec_nonsplat_edgecase() {64; CHECK-LABEL: @p2_vec_nonsplat_edgecase(65; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()66; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], <i8 3, i8 0>67; CHECK-NEXT: ret <2 x i1> [[RET]]68;69 %x = call <2 x i8> @gen2x8()70 %tmp0 = and <2 x i8> %x, <i8 3, i8 0>71 %ret = icmp sgt <2 x i8> %x, %tmp072 ret <2 x i1> %ret73}74 75define <3 x i1> @p3_vec_splat_poison() {76; CHECK-LABEL: @p3_vec_splat_poison(77; CHECK-NEXT: [[X:%.*]] = call <3 x i8> @gen3x8()78; CHECK-NEXT: [[RET:%.*]] = icmp sgt <3 x i8> [[X]], <i8 3, i8 poison, i8 3>79; CHECK-NEXT: ret <3 x i1> [[RET]]80;81 %x = call <3 x i8> @gen3x8()82 %tmp0 = and <3 x i8> %x, <i8 3, i8 poison, i8 3>83 %ret = icmp sgt <3 x i8> %x, %tmp084 ret <3 x i1> %ret85}86 87define <3 x i1> @p3_vec_nonsplat_poison() {88; CHECK-LABEL: @p3_vec_nonsplat_poison(89; CHECK-NEXT: [[X:%.*]] = call <3 x i8> @gen3x8()90; CHECK-NEXT: [[RET:%.*]] = icmp sgt <3 x i8> [[X]], <i8 15, i8 3, i8 poison>91; CHECK-NEXT: ret <3 x i1> [[RET]]92;93 %x = call <3 x i8> @gen3x8()94 %tmp0 = and <3 x i8> %x, <i8 15, i8 3, i8 poison>95 %ret = icmp sgt <3 x i8> %x, %tmp096 ret <3 x i1> %ret97}98 99; ============================================================================ ;100; One-use tests. We don't care about multi-uses here.101; ============================================================================ ;102 103declare void @use8(i8)104 105define i1 @oneuse0() {106; CHECK-LABEL: @oneuse0(107; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()108; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3109; CHECK-NEXT: call void @use8(i8 [[TMP0]])110; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], 3111; CHECK-NEXT: ret i1 [[RET]]112;113 %x = call i8 @gen8()114 %tmp0 = and i8 %x, 3115 call void @use8(i8 %tmp0)116 %ret = icmp sgt i8 %x, %tmp0117 ret i1 %ret118}119 120; ============================================================================ ;121; Negative tests122; ============================================================================ ;123 124; Commutativity tests.125 126define i1 @c0(i8 %x) {127; CHECK-LABEL: @c0(128; CHECK-NEXT: [[RET:%.*]] = icmp slt i8 [[X:%.*]], 0129; CHECK-NEXT: ret i1 [[RET]]130;131 %tmp0 = and i8 %x, 3132 %ret = icmp sgt i8 %tmp0, %x ; swapped order133 ret i1 %ret134}135 136; ============================================================================ ;137; Rest of negative tests138; ============================================================================ ;139 140define i1 @n0() {141; CHECK-LABEL: @n0(142; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()143; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 4144; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP0]]145; CHECK-NEXT: ret i1 [[RET]]146;147 %x = call i8 @gen8()148 %tmp0 = and i8 %x, 4 ; power-of-two, but invalid.149 %ret = icmp sgt i8 %x, %tmp0150 ret i1 %ret151}152 153define i1 @n1(i8 %y, i8 %notx) {154; CHECK-LABEL: @n1(155; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()156; CHECK-NEXT: [[TMP0:%.*]] = and i8 [[X]], 3157; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP0]], [[NOTX:%.*]]158; CHECK-NEXT: ret i1 [[RET]]159;160 %x = call i8 @gen8()161 %tmp0 = and i8 %x, 3162 %ret = icmp sgt i8 %tmp0, %notx ; not %x163 ret i1 %ret164}165 166define <2 x i1> @n2() {167; CHECK-LABEL: @n2(168; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()169; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 16>170; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], [[TMP0]]171; CHECK-NEXT: ret <2 x i1> [[RET]]172;173 %x = call <2 x i8> @gen2x8()174 %tmp0 = and <2 x i8> %x, <i8 3, i8 16> ; only the first one is valid.175 %ret = icmp sgt <2 x i8> %x, %tmp0176 ret <2 x i1> %ret177}178 179; ============================================================================ ;180; Potential miscompiles.181; ============================================================================ ;182 183define i1 @pv(i8 %y) {184; CHECK-LABEL: @pv(185; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()186; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]187; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]]188; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP1]]189; CHECK-NEXT: ret i1 [[RET]]190;191 %x = call i8 @gen8()192 %tmp0 = lshr i8 -1, %y193 %tmp1 = and i8 %tmp0, %x194 %ret = icmp sgt i8 %x, %tmp1195 ret i1 %ret196}197 198define <2 x i1> @n3_vec() {199; CHECK-LABEL: @n3_vec(200; CHECK-NEXT: [[X:%.*]] = call <2 x i8> @gen2x8()201; CHECK-NEXT: [[TMP0:%.*]] = and <2 x i8> [[X]], <i8 3, i8 -1>202; CHECK-NEXT: [[RET:%.*]] = icmp sgt <2 x i8> [[X]], [[TMP0]]203; CHECK-NEXT: ret <2 x i1> [[RET]]204;205 %x = call <2 x i8> @gen2x8()206 %tmp0 = and <2 x i8> %x, <i8 3, i8 -1>207 %ret = icmp sgt <2 x i8> %x, %tmp0208 ret <2 x i1> %ret209}210 211define <3 x i1> @n4_vec() {212; CHECK-LABEL: @n4_vec(213; CHECK-NEXT: [[X:%.*]] = call <3 x i8> @gen3x8()214; CHECK-NEXT: [[TMP0:%.*]] = and <3 x i8> [[X]], <i8 3, i8 poison, i8 -1>215; CHECK-NEXT: [[RET:%.*]] = icmp sgt <3 x i8> [[X]], [[TMP0]]216; CHECK-NEXT: ret <3 x i1> [[RET]]217;218 %x = call <3 x i8> @gen3x8()219 %tmp0 = and <3 x i8> %x, <i8 3, i8 poison, i8 -1>220 %ret = icmp sgt <3 x i8> %x, %tmp0221 ret <3 x i1> %ret222}223 224; Commutativity tests with variable225 226; Ok, this one should fold. We only testing commutativity of 'and'.227define i1 @cv0_GOOD(i8 %y) {228; CHECK-LABEL: @cv0_GOOD(229; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()230; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]231; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X]]232; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[X]], [[TMP1]]233; CHECK-NEXT: ret i1 [[RET]]234;235 %x = call i8 @gen8()236 %tmp0 = lshr i8 -1, %y237 %tmp1 = and i8 %tmp0, %x ; swapped order238 %ret = icmp sgt i8 %x, %tmp1239 ret i1 %ret240}241 242define i1 @cv1(i8 %y) {243; CHECK-LABEL: @cv1(244; CHECK-NEXT: [[X:%.*]] = call i8 @gen8()245; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]246; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[X]], [[TMP0]]247; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP1]], [[X]]248; CHECK-NEXT: ret i1 [[RET]]249;250 %x = call i8 @gen8()251 %tmp0 = lshr i8 -1, %y252 %tmp1 = and i8 %x, %tmp0253 %ret = icmp sgt i8 %tmp1, %x ; swapped order254 ret i1 %ret255}256 257define i1 @cv2(i8 %x, i8 %y) {258; CHECK-LABEL: @cv2(259; CHECK-NEXT: [[TMP0:%.*]] = lshr i8 -1, [[Y:%.*]]260; CHECK-NEXT: [[TMP1:%.*]] = and i8 [[TMP0]], [[X:%.*]]261; CHECK-NEXT: [[RET:%.*]] = icmp sgt i8 [[TMP1]], [[X]]262; CHECK-NEXT: ret i1 [[RET]]263;264 %tmp0 = lshr i8 -1, %y265 %tmp1 = and i8 %tmp0, %x ; swapped order266 %ret = icmp sgt i8 %tmp1, %x ; swapped order267 ret i1 %ret268}269