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Issue 19492007: Generate KeyedLoadDictionaryElementStub with Hydrogen (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Add V8_OVERRIDE Created 7 years, 1 month ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 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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1616 Label done; 1616 Label done;
1617 1617
1618 GetNumberHash(t0, t1); 1618 GetNumberHash(t0, t1);
1619 1619
1620 // Compute the capacity mask. 1620 // Compute the capacity mask.
1621 ldr(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset)); 1621 ldr(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset));
1622 SmiUntag(t1); 1622 SmiUntag(t1);
1623 sub(t1, t1, Operand(1)); 1623 sub(t1, t1, Operand(1));
1624 1624
1625 // Generate an unrolled loop that performs a few probes before giving up. 1625 // Generate an unrolled loop that performs a few probes before giving up.
1626 static const int kProbes = 4; 1626 for (int i = 0; i < kNumberDictionaryProbes; i++) {
1627 for (int i = 0; i < kProbes; i++) {
1628 // Use t2 for index calculations and keep the hash intact in t0. 1627 // Use t2 for index calculations and keep the hash intact in t0.
1629 mov(t2, t0); 1628 mov(t2, t0);
1630 // Compute the masked index: (hash + i + i * i) & mask. 1629 // Compute the masked index: (hash + i + i * i) & mask.
1631 if (i > 0) { 1630 if (i > 0) {
1632 add(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i))); 1631 add(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i)));
1633 } 1632 }
1634 and_(t2, t2, Operand(t1)); 1633 and_(t2, t2, Operand(t1));
1635 1634
1636 // Scale the index by multiplying by the element size. 1635 // Scale the index by multiplying by the element size.
1637 ASSERT(SeededNumberDictionary::kEntrySize == 3); 1636 ASSERT(SeededNumberDictionary::kEntrySize == 3);
1638 add(t2, t2, Operand(t2, LSL, 1)); // t2 = t2 * 3 1637 add(t2, t2, Operand(t2, LSL, 1)); // t2 = t2 * 3
1639 1638
1640 // Check if the key is identical to the name. 1639 // Check if the key is identical to the name.
1641 add(t2, elements, Operand(t2, LSL, kPointerSizeLog2)); 1640 add(t2, elements, Operand(t2, LSL, kPointerSizeLog2));
1642 ldr(ip, FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset)); 1641 ldr(ip, FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset));
1643 cmp(key, Operand(ip)); 1642 cmp(key, Operand(ip));
1644 if (i != kProbes - 1) { 1643 if (i != kNumberDictionaryProbes - 1) {
1645 b(eq, &done); 1644 b(eq, &done);
1646 } else { 1645 } else {
1647 b(ne, miss); 1646 b(ne, miss);
1648 } 1647 }
1649 } 1648 }
1650 1649
1651 bind(&done); 1650 bind(&done);
1652 // Check that the value is a normal property. 1651 // Check that the value is a normal property.
1653 // t2: elements + (index * kPointerSize) 1652 // t2: elements + (index * kPointerSize)
1654 const int kDetailsOffset = 1653 const int kDetailsOffset =
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3991 void CodePatcher::EmitCondition(Condition cond) { 3990 void CodePatcher::EmitCondition(Condition cond) {
3992 Instr instr = Assembler::instr_at(masm_.pc_); 3991 Instr instr = Assembler::instr_at(masm_.pc_);
3993 instr = (instr & ~kCondMask) | cond; 3992 instr = (instr & ~kCondMask) | cond;
3994 masm_.emit(instr); 3993 masm_.emit(instr);
3995 } 3994 }
3996 3995
3997 3996
3998 } } // namespace v8::internal 3997 } } // namespace v8::internal
3999 3998
4000 #endif // V8_TARGET_ARCH_ARM 3999 #endif // V8_TARGET_ARCH_ARM
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