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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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1634 // condition code uses at the patched jump. | 1634 // condition code uses at the patched jump. |
1635 int delta = Assembler::GetCmpImmediateRawImmediate(instr); | 1635 int delta = Assembler::GetCmpImmediateRawImmediate(instr); |
1636 delta += | 1636 delta += |
1637 Assembler::GetCmpImmediateRegister(instr).code() * kOff12Mask; | 1637 Assembler::GetCmpImmediateRegister(instr).code() * kOff12Mask; |
1638 // If the delta is 0 the instruction is cmp r0, #0 which also signals that | 1638 // If the delta is 0 the instruction is cmp r0, #0 which also signals that |
1639 // nothing was inlined. | 1639 // nothing was inlined. |
1640 if (delta == 0) { | 1640 if (delta == 0) { |
1641 return; | 1641 return; |
1642 } | 1642 } |
1643 | 1643 |
1644 #ifdef DEBUG | |
1645 if (FLAG_trace_ic) { | 1644 if (FLAG_trace_ic) { |
1646 PrintF("[ patching ic at %p, cmp=%p, delta=%d\n", | 1645 PrintF("[ patching ic at %p, cmp=%p, delta=%d\n", |
1647 address, cmp_instruction_address, delta); | 1646 address, cmp_instruction_address, delta); |
1648 } | 1647 } |
1649 #endif | |
1650 | 1648 |
1651 Address patch_address = | 1649 Address patch_address = |
1652 cmp_instruction_address - delta * Instruction::kInstrSize; | 1650 cmp_instruction_address - delta * Instruction::kInstrSize; |
1653 Instr instr_at_patch = Assembler::instr_at(patch_address); | 1651 Instr instr_at_patch = Assembler::instr_at(patch_address); |
1654 Instr branch_instr = | 1652 Instr branch_instr = |
1655 Assembler::instr_at(patch_address + Instruction::kInstrSize); | 1653 Assembler::instr_at(patch_address + Instruction::kInstrSize); |
1656 // This is patching a conditional "jump if not smi/jump if smi" site. | 1654 // This is patching a conditional "jump if not smi/jump if smi" site. |
1657 // Enabling by changing from | 1655 // Enabling by changing from |
1658 // cmp rx, rx | 1656 // cmp rx, rx |
1659 // b eq/ne, <target> | 1657 // b eq/ne, <target> |
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1679 } else { | 1677 } else { |
1680 ASSERT(Assembler::GetCondition(branch_instr) == ne); | 1678 ASSERT(Assembler::GetCondition(branch_instr) == ne); |
1681 patcher.EmitCondition(eq); | 1679 patcher.EmitCondition(eq); |
1682 } | 1680 } |
1683 } | 1681 } |
1684 | 1682 |
1685 | 1683 |
1686 } } // namespace v8::internal | 1684 } } // namespace v8::internal |
1687 | 1685 |
1688 #endif // V8_TARGET_ARCH_ARM | 1686 #endif // V8_TARGET_ARCH_ARM |
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