1213 }
1214 }
1215 return false;
1216 }
1217
1218 bool IfNode::is_null_check(ProjNode* proj, PhaseIterGVN* igvn) {
1219 Node* other = in(1)->in(1)->in(2);
1220 if (other->in(MemNode::Address) != nullptr &&
1221 proj->in(0)->in(1) != nullptr &&
1222 proj->in(0)->in(1)->is_Bool() &&
1223 proj->in(0)->in(1)->in(1) != nullptr &&
1224 proj->in(0)->in(1)->in(1)->Opcode() == Op_CmpP &&
1225 proj->in(0)->in(1)->in(1)->in(2) != nullptr &&
1226 proj->in(0)->in(1)->in(1)->in(1) == other->in(MemNode::Address)->in(AddPNode::Address)->uncast() &&
1227 igvn->type(proj->in(0)->in(1)->in(1)->in(2)) == TypePtr::NULL_PTR) {
1228 return true;
1229 }
1230 return false;
1231 }
1232
1233 // Check that the If that is in between the 2 integer comparisons has
1234 // no side effect
1235 bool IfNode::is_side_effect_free_test(ProjNode* proj, PhaseIterGVN* igvn) {
1236 if (proj == nullptr) {
1237 return false;
1238 }
1239 CallStaticJavaNode* unc = proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1240 if (unc != nullptr && proj->outcnt() <= 2) {
1241 if (proj->outcnt() == 1 ||
1242 // Allow simple null check from LoadRange
1243 (is_cmp_with_loadrange(proj) && is_null_check(proj, igvn))) {
1244 CallStaticJavaNode* unc = proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1245 CallStaticJavaNode* dom_unc = proj->in(0)->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1246 assert(dom_unc != nullptr, "is_uncommon_trap_if_pattern returned null");
1247
1248 // reroute_side_effect_free_unc changes the state of this
1249 // uncommon trap to restart execution at the previous
1250 // CmpI. Check that this change in a previous compilation didn't
1251 // cause too many traps.
1252 int trap_request = unc->uncommon_trap_request();
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1213 }
1214 }
1215 return false;
1216 }
1217
1218 bool IfNode::is_null_check(ProjNode* proj, PhaseIterGVN* igvn) {
1219 Node* other = in(1)->in(1)->in(2);
1220 if (other->in(MemNode::Address) != nullptr &&
1221 proj->in(0)->in(1) != nullptr &&
1222 proj->in(0)->in(1)->is_Bool() &&
1223 proj->in(0)->in(1)->in(1) != nullptr &&
1224 proj->in(0)->in(1)->in(1)->Opcode() == Op_CmpP &&
1225 proj->in(0)->in(1)->in(1)->in(2) != nullptr &&
1226 proj->in(0)->in(1)->in(1)->in(1) == other->in(MemNode::Address)->in(AddPNode::Address)->uncast() &&
1227 igvn->type(proj->in(0)->in(1)->in(1)->in(2)) == TypePtr::NULL_PTR) {
1228 return true;
1229 }
1230 return false;
1231 }
1232
1233 // Returns true if this IfNode belongs to a flat array check
1234 // and returns the corresponding array in the 'array' parameter.
1235 bool IfNode::is_flat_array_check(PhaseTransform* phase, Node** array) {
1236 Node* bol = in(1);
1237 if (!bol->is_Bool()) {
1238 return false;
1239 }
1240 Node* cmp = bol->in(1);
1241 if (cmp->isa_FlatArrayCheck()) {
1242 if (array != NULL) {
1243 *array = cmp->in(FlatArrayCheckNode::ArrayOrKlass);
1244 }
1245 return true;
1246 }
1247 return false;
1248 }
1249
1250 // Check that the If that is in between the 2 integer comparisons has
1251 // no side effect
1252 bool IfNode::is_side_effect_free_test(ProjNode* proj, PhaseIterGVN* igvn) {
1253 if (proj == nullptr) {
1254 return false;
1255 }
1256 CallStaticJavaNode* unc = proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1257 if (unc != nullptr && proj->outcnt() <= 2) {
1258 if (proj->outcnt() == 1 ||
1259 // Allow simple null check from LoadRange
1260 (is_cmp_with_loadrange(proj) && is_null_check(proj, igvn))) {
1261 CallStaticJavaNode* unc = proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1262 CallStaticJavaNode* dom_unc = proj->in(0)->in(0)->as_Proj()->is_uncommon_trap_if_pattern(Deoptimization::Reason_none);
1263 assert(dom_unc != nullptr, "is_uncommon_trap_if_pattern returned null");
1264
1265 // reroute_side_effect_free_unc changes the state of this
1266 // uncommon trap to restart execution at the previous
1267 // CmpI. Check that this change in a previous compilation didn't
1268 // cause too many traps.
1269 int trap_request = unc->uncommon_trap_request();
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