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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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1407 | 1407 |
1408 ldr(scratch, FieldMemOperand(scratch, token_offset)); | 1408 ldr(scratch, FieldMemOperand(scratch, token_offset)); |
1409 ldr(ip, FieldMemOperand(ip, token_offset)); | 1409 ldr(ip, FieldMemOperand(ip, token_offset)); |
1410 cmp(scratch, Operand(ip)); | 1410 cmp(scratch, Operand(ip)); |
1411 b(ne, miss); | 1411 b(ne, miss); |
1412 | 1412 |
1413 bind(&same_contexts); | 1413 bind(&same_contexts); |
1414 } | 1414 } |
1415 | 1415 |
1416 | 1416 |
1417 void MacroAssembler::GetNumberHash(Register t0, Register scratch) { | |
1418 // First of all we assign the hash seed to scratch. | |
1419 LoadRoot(scratch, Heap::kStringHashSeedRootIndex); | |
1420 mov(scratch, Operand(scratch, LSR, kSmiTagSize)); | |
Erik Corry
2012/01/10 11:53:16
Use SmiUntag(scratch)
| |
1421 | |
1422 // Xor original key with a seed | |
Erik Corry
2012/01/10 11:53:16
seed -> seed.
| |
1423 eor(t0, t0, Operand(scratch)); | |
1424 | |
1425 // Compute the hash code from the untagged key. This must be kept in sync | |
1426 // with ComputeIntegerHash in utils.h. | |
1427 // | |
1428 // hash = ~hash + (hash << 15); | |
1429 mvn(scratch, Operand(t0)); | |
1430 add(t0, scratch, Operand(t0, LSL, 15)); | |
1431 // hash = hash ^ (hash >> 12); | |
1432 eor(t0, t0, Operand(t0, LSR, 12)); | |
1433 // hash = hash + (hash << 2); | |
1434 add(t0, t0, Operand(t0, LSL, 2)); | |
1435 // hash = hash ^ (hash >> 4); | |
1436 eor(t0, t0, Operand(t0, LSR, 4)); | |
1437 // hash = hash * 2057; | |
1438 mov(scratch, Operand(2057)); | |
Erik Corry
2012/01/10 11:53:16
This should be done with shifts and adds. See the
| |
1439 mul(t0, t0, scratch); | |
1440 // hash = hash ^ (hash >> 16); | |
1441 eor(t0, t0, Operand(t0, LSR, 16)); | |
1442 } | |
1443 | |
1444 | |
1417 void MacroAssembler::LoadFromNumberDictionary(Label* miss, | 1445 void MacroAssembler::LoadFromNumberDictionary(Label* miss, |
1418 Register elements, | 1446 Register elements, |
1419 Register key, | 1447 Register key, |
1420 Register result, | 1448 Register result, |
1421 Register t0, | 1449 Register t0, |
1422 Register t1, | 1450 Register t1, |
1423 Register t2) { | 1451 Register t2) { |
1424 // Register use: | 1452 // Register use: |
1425 // | 1453 // |
1426 // elements - holds the slow-case elements of the receiver on entry. | 1454 // elements - holds the slow-case elements of the receiver on entry. |
1427 // Unchanged unless 'result' is the same register. | 1455 // Unchanged unless 'result' is the same register. |
1428 // | 1456 // |
1429 // key - holds the smi key on entry. | 1457 // key - holds the smi key on entry. |
1430 // Unchanged unless 'result' is the same register. | 1458 // Unchanged unless 'result' is the same register. |
1431 // | 1459 // |
1432 // result - holds the result on exit if the load succeeded. | 1460 // result - holds the result on exit if the load succeeded. |
1433 // Allowed to be the same as 'key' or 'result'. | 1461 // Allowed to be the same as 'key' or 'result'. |
1434 // Unchanged on bailout so 'key' or 'result' can be used | 1462 // Unchanged on bailout so 'key' or 'result' can be used |
1435 // in further computation. | 1463 // in further computation. |
1436 // | 1464 // |
1437 // Scratch registers: | 1465 // Scratch registers: |
1438 // | 1466 // |
1439 // t0 - holds the untagged key on entry and holds the hash once computed. | 1467 // t0 - holds the untagged key on entry and holds the hash once computed. |
1440 // | 1468 // |
1441 // t1 - used to hold the capacity mask of the dictionary | 1469 // t1 - used to hold the capacity mask of the dictionary |
1442 // | 1470 // |
1443 // t2 - used for the index into the dictionary. | 1471 // t2 - used for the index into the dictionary. |
1444 Label done; | 1472 Label done; |
1445 | 1473 |
1446 // Compute the hash code from the untagged key. This must be kept in sync | 1474 GetNumberHash(t0, t1); |
1447 // with ComputeIntegerHash in utils.h. | |
1448 // | |
1449 // hash = ~hash + (hash << 15); | |
1450 mvn(t1, Operand(t0)); | |
1451 add(t0, t1, Operand(t0, LSL, 15)); | |
1452 // hash = hash ^ (hash >> 12); | |
1453 eor(t0, t0, Operand(t0, LSR, 12)); | |
1454 // hash = hash + (hash << 2); | |
1455 add(t0, t0, Operand(t0, LSL, 2)); | |
1456 // hash = hash ^ (hash >> 4); | |
1457 eor(t0, t0, Operand(t0, LSR, 4)); | |
1458 // hash = hash * 2057; | |
1459 mov(t1, Operand(2057)); | |
1460 mul(t0, t0, t1); | |
1461 // hash = hash ^ (hash >> 16); | |
1462 eor(t0, t0, Operand(t0, LSR, 16)); | |
1463 | 1475 |
1464 // Compute the capacity mask. | 1476 // Compute the capacity mask. |
1465 ldr(t1, FieldMemOperand(elements, NumberDictionary::kCapacityOffset)); | 1477 ldr(t1, FieldMemOperand(elements, NumberDictionary::kCapacityOffset)); |
1466 mov(t1, Operand(t1, ASR, kSmiTagSize)); // convert smi to int | 1478 mov(t1, Operand(t1, ASR, kSmiTagSize)); // convert smi to int |
1467 sub(t1, t1, Operand(1)); | 1479 sub(t1, t1, Operand(1)); |
1468 | 1480 |
1469 // Generate an unrolled loop that performs a few probes before giving up. | 1481 // Generate an unrolled loop that performs a few probes before giving up. |
1470 static const int kProbes = 4; | 1482 static const int kProbes = 4; |
1471 for (int i = 0; i < kProbes; i++) { | 1483 for (int i = 0; i < kProbes; i++) { |
1472 // Use t2 for index calculations and keep the hash intact in t0. | 1484 // Use t2 for index calculations and keep the hash intact in t0. |
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3625 void CodePatcher::EmitCondition(Condition cond) { | 3637 void CodePatcher::EmitCondition(Condition cond) { |
3626 Instr instr = Assembler::instr_at(masm_.pc_); | 3638 Instr instr = Assembler::instr_at(masm_.pc_); |
3627 instr = (instr & ~kCondMask) | cond; | 3639 instr = (instr & ~kCondMask) | cond; |
3628 masm_.emit(instr); | 3640 masm_.emit(instr); |
3629 } | 3641 } |
3630 | 3642 |
3631 | 3643 |
3632 } } // namespace v8::internal | 3644 } } // namespace v8::internal |
3633 | 3645 |
3634 #endif // V8_TARGET_ARCH_ARM | 3646 #endif // V8_TARGET_ARCH_ARM |
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