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Issue 6708085: Enable GVN for polymorphic loads by not expanding them at the HIR level. (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: Created 9 years, 9 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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2115 Register result = ToRegister(instr->result()); 2115 Register result = ToRegister(instr->result());
2116 if (instr->hydrogen()->is_in_object()) { 2116 if (instr->hydrogen()->is_in_object()) {
2117 __ mov(result, FieldOperand(object, instr->hydrogen()->offset())); 2117 __ mov(result, FieldOperand(object, instr->hydrogen()->offset()));
2118 } else { 2118 } else {
2119 __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset)); 2119 __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset));
2120 __ mov(result, FieldOperand(result, instr->hydrogen()->offset())); 2120 __ mov(result, FieldOperand(result, instr->hydrogen()->offset()));
2121 } 2121 }
2122 } 2122 }
2123 2123
2124 2124
2125 void LCodeGen::EmitLoadField(Register result,
2126 Register object,
Kevin Millikin (Chromium) 2011/03/23 08:08:53 Indentation is off here.
fschneider 2011/03/23 13:57:56 Done.
2127 Handle<Map> type,
2128 LookupResult* lookup) {
2129 ASSERT(lookup->IsProperty() && lookup->type() == FIELD);
2130 int index = lookup->GetLocalFieldIndexFromMap(*type);
2131 int offset = index * kPointerSize;
2132 if (index < 0) {
2133 // Negative property indices are in-object properties, indexed
2134 // from the end of the fixed part of the object.
2135 __ mov(result, FieldOperand(object, offset + type->instance_size()));
2136 } else {
2137 // Non-negative property indices are in the properties array.
2138 __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset));
2139 __ mov(result, FieldOperand(result, offset + FixedArray::kHeaderSize));
2140 }
2141 }
2142
2143
2144 void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) {
2145 Register object = ToRegister(instr->InputAt(0));
Kevin Millikin (Chromium) 2011/03/23 08:08:53 I don't like relying on the order of the operands.
fschneider 2011/03/23 13:57:56 Done.
2146 Register result = ToRegister(instr->result());
2147 NearLabel done;
2148 int num_maps = instr->hydrogen()->types()->length();
Kevin Millikin (Chromium) 2011/03/23 08:08:53 map_count is only one character longer and avoids
fschneider 2011/03/23 13:57:56 Done.
2149 for (int i = 0; i < num_maps; ++i) {
2150 Handle<Map> map = instr->hydrogen()->types()->at(i);
2151 LookupResult lookup;
2152 map->LookupInDescriptors(NULL, *instr->hydrogen()->name(), &lookup);
2153
2154 NearLabel next;
2155 __ cmp(FieldOperand(object, HeapObject::kMapOffset), map);
Kevin Millikin (Chromium) 2011/03/23 08:08:53 We could avoid multiple loads of the map by using
fschneider 2011/03/23 13:57:56 I'll leave it as is in this change. Another way wo
Kevin Millikin (Chromium) 2011/03/23 14:17:04 OK, leaving it for later sounds good to me.
2156 if (i == num_maps - 1 && !instr->hydrogen()->need_generic()) {
2157 DeoptimizeIf(not_equal, instr->environment());
2158 } else {
2159 __ j(not_equal, &next);
2160 }
2161 EmitLoadField(result, object, map, &lookup);
2162 if (i < num_maps - 1 || instr->hydrogen()->need_generic()) {
Kevin Millikin (Chromium) 2011/03/23 08:08:53 If you handle all but the last map in the loop, I
fschneider 2011/03/23 13:57:56 Done.
2163 __ jmp(&done);
2164 __ bind(&next);
2165 }
2166 }
2167 if (instr->hydrogen()->need_generic()) {
2168 __ mov(ecx, instr->hydrogen()->name());
2169 Handle<Code> ic(
2170 isolate()->builtins()->builtin(Builtins::LoadIC_Initialize));
2171 CallCode(ic, RelocInfo::CODE_TARGET, instr, false);
2172 }
2173 __ bind(&done);
2174 }
2175
2176
2125 void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) { 2177 void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
2126 ASSERT(ToRegister(instr->context()).is(esi)); 2178 ASSERT(ToRegister(instr->context()).is(esi));
2127 ASSERT(ToRegister(instr->object()).is(eax)); 2179 ASSERT(ToRegister(instr->object()).is(eax));
2128 ASSERT(ToRegister(instr->result()).is(eax)); 2180 ASSERT(ToRegister(instr->result()).is(eax));
2129 2181
2130 __ mov(ecx, instr->name()); 2182 __ mov(ecx, instr->name());
2131 Handle<Code> ic(isolate()->builtins()->builtin(Builtins::LoadIC_Initialize)); 2183 Handle<Code> ic(isolate()->builtins()->builtin(Builtins::LoadIC_Initialize));
2132 CallCode(ic, RelocInfo::CODE_TARGET, instr); 2184 CallCode(ic, RelocInfo::CODE_TARGET, instr);
2133 } 2185 }
2134 2186
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4003 ASSERT(osr_pc_offset_ == -1); 4055 ASSERT(osr_pc_offset_ == -1);
4004 osr_pc_offset_ = masm()->pc_offset(); 4056 osr_pc_offset_ = masm()->pc_offset();
4005 } 4057 }
4006 4058
4007 4059
4008 #undef __ 4060 #undef __
4009 4061
4010 } } // namespace v8::internal 4062 } } // namespace v8::internal
4011 4063
4012 #endif // V8_TARGET_ARCH_IA32 4064 #endif // V8_TARGET_ARCH_IA32
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