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Side by Side Diff: runtime/vm/assembler_mips.h

Issue 13094015: Simplifies MIPS LoadWordFromPoolOffset (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 7 years, 8 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #ifndef VM_ASSEMBLER_MIPS_H_ 5 #ifndef VM_ASSEMBLER_MIPS_H_
6 #define VM_ASSEMBLER_MIPS_H_ 6 #define VM_ASSEMBLER_MIPS_H_
7 7
8 #ifndef VM_ASSEMBLER_H_ 8 #ifndef VM_ASSEMBLER_H_
9 #error Do not include assembler_mips.h directly; use assembler.h instead. 9 #error Do not include assembler_mips.h directly; use assembler.h instead.
10 #endif 10 #endif
(...skipping 654 matching lines...) Expand 10 before | Expand all | Expand 10 after
665 Emit(opcode << kOpcodeShift | 665 Emit(opcode << kOpcodeShift |
666 rs << kRsShift | 666 rs << kRsShift |
667 rt << kRtShift | 667 rt << kRtShift |
668 rd << kRdShift | 668 rd << kRdShift |
669 sa << kSaShift | 669 sa << kSaShift |
670 func << kFunctionShift); 670 func << kFunctionShift);
671 } 671 }
672 672
673 void EmitBranch(Opcode b, Register rs, Register rt, Label* label) { 673 void EmitBranch(Opcode b, Register rs, Register rt, Label* label) {
674 if (label->IsBound()) { 674 if (label->IsBound()) {
675 // Reletive destination from an instruction after the branch. 675 // Relative destination from an instruction after the branch.
676 const int32_t dest = 676 const int32_t dest =
677 label->Position() - (buffer_.Size() + Instr::kInstrSize); 677 label->Position() - (buffer_.Size() + Instr::kInstrSize);
678 const uint16_t dest_off = EncodeBranchOffset(dest, 0); 678 const uint16_t dest_off = EncodeBranchOffset(dest, 0);
679 EmitIType(b, rs, rt, dest_off); 679 EmitIType(b, rs, rt, dest_off);
680 } else { 680 } else {
681 const int position = buffer_.Size(); 681 const int position = buffer_.Size();
682 EmitIType(b, rs, rt, label->position_); 682 EmitIType(b, rs, rt, label->position_);
683 label->LinkTo(position); 683 label->LinkTo(position);
684 } 684 }
685 } 685 }
686 686
687 void EmitRegImmBranch(RtRegImm b, Register rs, Label* label) { 687 void EmitRegImmBranch(RtRegImm b, Register rs, Label* label) {
688 if (label->IsBound()) { 688 if (label->IsBound()) {
689 // Reletive destination from an instruction after the branch. 689 // Relative destination from an instruction after the branch.
690 const int32_t dest = 690 const int32_t dest =
691 label->Position() - (buffer_.Size() + Instr::kInstrSize); 691 label->Position() - (buffer_.Size() + Instr::kInstrSize);
692 const uint16_t dest_off = EncodeBranchOffset(dest, 0); 692 const uint16_t dest_off = EncodeBranchOffset(dest, 0);
693 EmitRegImmType(REGIMM, rs, b, dest_off); 693 EmitRegImmType(REGIMM, rs, b, dest_off);
694 } else { 694 } else {
695 const int position = buffer_.Size(); 695 const int position = buffer_.Size();
696 EmitRegImmType(REGIMM, rs, b, label->position_); 696 EmitRegImmType(REGIMM, rs, b, label->position_);
697 label->LinkTo(position); 697 label->LinkTo(position);
698 } 698 }
699 } 699 }
700 700
701 static int32_t EncodeBranchOffset(int32_t offset, int32_t instr); 701 static int32_t EncodeBranchOffset(int32_t offset, int32_t instr);
702 static int DecodeBranchOffset(int32_t instr); 702 static int DecodeBranchOffset(int32_t instr);
703 703
704 void EmitBranchDelayNop() { 704 void EmitBranchDelayNop() {
705 Emit(Instr::kNopInstruction); // Branch delay NOP. 705 Emit(Instr::kNopInstruction); // Branch delay NOP.
706 delay_slot_available_ = true; 706 delay_slot_available_ = true;
707 } 707 }
708 708
709 DISALLOW_ALLOCATION(); 709 DISALLOW_ALLOCATION();
710 DISALLOW_COPY_AND_ASSIGN(Assembler); 710 DISALLOW_COPY_AND_ASSIGN(Assembler);
711 }; 711 };
712 712
713 } // namespace dart 713 } // namespace dart
714 714
715 #endif // VM_ASSEMBLER_MIPS_H_ 715 #endif // VM_ASSEMBLER_MIPS_H_
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