9910edbb9a
R=jkummerow@chromium.org TEST=jkummerow@chromium.org Review URL: https://chromiumcodereview.appspot.com/10170030 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11636 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
454 lines
16 KiB
C++
454 lines
16 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#if defined(V8_TARGET_ARCH_MIPS)
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#include "codegen.h"
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#include "macro-assembler.h"
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namespace v8 {
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namespace internal {
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#define __ ACCESS_MASM(masm)
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UnaryMathFunction CreateTranscendentalFunction(TranscendentalCache::Type type) {
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switch (type) {
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case TranscendentalCache::SIN: return &sin;
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case TranscendentalCache::COS: return &cos;
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case TranscendentalCache::TAN: return &tan;
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case TranscendentalCache::LOG: return &log;
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default: UNIMPLEMENTED();
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}
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return NULL;
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}
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UnaryMathFunction CreateSqrtFunction() {
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return &sqrt;
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}
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// -------------------------------------------------------------------------
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// Platform-specific RuntimeCallHelper functions.
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void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
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masm->EnterFrame(StackFrame::INTERNAL);
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ASSERT(!masm->has_frame());
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masm->set_has_frame(true);
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}
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void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
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masm->LeaveFrame(StackFrame::INTERNAL);
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ASSERT(masm->has_frame());
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masm->set_has_frame(false);
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}
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// -------------------------------------------------------------------------
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// Code generators
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void ElementsTransitionGenerator::GenerateMapChangeElementsTransition(
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MacroAssembler* masm) {
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// ----------- S t a t e -------------
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// -- a0 : value
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// -- a1 : key
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// -- a2 : receiver
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// -- ra : return address
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// -- a3 : target map, scratch for subsequent call
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// -- t0 : scratch (elements)
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// -----------------------------------
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// Set transitioned map.
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__ sw(a3, FieldMemOperand(a2, HeapObject::kMapOffset));
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__ RecordWriteField(a2,
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HeapObject::kMapOffset,
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a3,
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t5,
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kRAHasNotBeenSaved,
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kDontSaveFPRegs,
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EMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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}
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void ElementsTransitionGenerator::GenerateSmiToDouble(
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MacroAssembler* masm, Label* fail) {
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// ----------- S t a t e -------------
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// -- a0 : value
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// -- a1 : key
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// -- a2 : receiver
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// -- ra : return address
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// -- a3 : target map, scratch for subsequent call
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// -- t0 : scratch (elements)
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// -----------------------------------
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Label loop, entry, convert_hole, gc_required, only_change_map, done;
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bool fpu_supported = CpuFeatures::IsSupported(FPU);
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Register scratch = t6;
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// Check for empty arrays, which only require a map transition and no changes
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// to the backing store.
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__ lw(t0, FieldMemOperand(a2, JSObject::kElementsOffset));
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__ LoadRoot(at, Heap::kEmptyFixedArrayRootIndex);
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__ Branch(&only_change_map, eq, at, Operand(t0));
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__ push(ra);
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__ lw(t1, FieldMemOperand(t0, FixedArray::kLengthOffset));
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// t0: source FixedArray
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// t1: number of elements (smi-tagged)
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// Allocate new FixedDoubleArray.
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__ sll(scratch, t1, 2);
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__ Addu(scratch, scratch, FixedDoubleArray::kHeaderSize);
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__ AllocateInNewSpace(scratch, t2, t3, t5, &gc_required, NO_ALLOCATION_FLAGS);
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// t2: destination FixedDoubleArray, not tagged as heap object
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// Set destination FixedDoubleArray's length and map.
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__ LoadRoot(t5, Heap::kFixedDoubleArrayMapRootIndex);
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__ sw(t1, MemOperand(t2, FixedDoubleArray::kLengthOffset));
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__ sw(t5, MemOperand(t2, HeapObject::kMapOffset));
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// Update receiver's map.
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__ sw(a3, FieldMemOperand(a2, HeapObject::kMapOffset));
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__ RecordWriteField(a2,
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HeapObject::kMapOffset,
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a3,
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t5,
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kRAHasBeenSaved,
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kDontSaveFPRegs,
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OMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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// Replace receiver's backing store with newly created FixedDoubleArray.
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__ Addu(a3, t2, Operand(kHeapObjectTag));
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__ sw(a3, FieldMemOperand(a2, JSObject::kElementsOffset));
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__ RecordWriteField(a2,
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JSObject::kElementsOffset,
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a3,
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t5,
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kRAHasBeenSaved,
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kDontSaveFPRegs,
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EMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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// Prepare for conversion loop.
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__ Addu(a3, t0, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
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__ Addu(t3, t2, Operand(FixedDoubleArray::kHeaderSize));
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__ sll(t2, t1, 2);
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__ Addu(t2, t2, t3);
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__ li(t0, Operand(kHoleNanLower32));
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__ li(t1, Operand(kHoleNanUpper32));
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// t0: kHoleNanLower32
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// t1: kHoleNanUpper32
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// t2: end of destination FixedDoubleArray, not tagged
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// t3: begin of FixedDoubleArray element fields, not tagged
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if (!fpu_supported) __ Push(a1, a0);
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__ Branch(&entry);
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__ bind(&only_change_map);
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__ sw(a3, FieldMemOperand(a2, HeapObject::kMapOffset));
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__ RecordWriteField(a2,
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HeapObject::kMapOffset,
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a3,
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t5,
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kRAHasBeenSaved,
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kDontSaveFPRegs,
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OMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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__ Branch(&done);
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// Call into runtime if GC is required.
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__ bind(&gc_required);
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__ pop(ra);
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__ Branch(fail);
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// Convert and copy elements.
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__ bind(&loop);
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__ lw(t5, MemOperand(a3));
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__ Addu(a3, a3, kIntSize);
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// t5: current element
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__ UntagAndJumpIfNotSmi(t5, t5, &convert_hole);
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// Normal smi, convert to double and store.
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if (fpu_supported) {
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CpuFeatures::Scope scope(FPU);
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__ mtc1(t5, f0);
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__ cvt_d_w(f0, f0);
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__ sdc1(f0, MemOperand(t3));
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__ Addu(t3, t3, kDoubleSize);
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} else {
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FloatingPointHelper::ConvertIntToDouble(masm,
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t5,
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FloatingPointHelper::kCoreRegisters,
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f0,
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a0,
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a1,
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t7,
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f0);
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__ sw(a0, MemOperand(t3)); // mantissa
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__ sw(a1, MemOperand(t3, kIntSize)); // exponent
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__ Addu(t3, t3, kDoubleSize);
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}
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__ Branch(&entry);
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// Hole found, store the-hole NaN.
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__ bind(&convert_hole);
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if (FLAG_debug_code) {
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// Restore a "smi-untagged" heap object.
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__ SmiTag(t5);
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__ Or(t5, t5, Operand(1));
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__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
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__ Assert(eq, "object found in smi-only array", at, Operand(t5));
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}
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__ sw(t0, MemOperand(t3)); // mantissa
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__ sw(t1, MemOperand(t3, kIntSize)); // exponent
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__ Addu(t3, t3, kDoubleSize);
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__ bind(&entry);
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__ Branch(&loop, lt, t3, Operand(t2));
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if (!fpu_supported) __ Pop(a1, a0);
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__ pop(ra);
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__ bind(&done);
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}
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void ElementsTransitionGenerator::GenerateDoubleToObject(
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MacroAssembler* masm, Label* fail) {
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// ----------- S t a t e -------------
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// -- a0 : value
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// -- a1 : key
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// -- a2 : receiver
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// -- ra : return address
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// -- a3 : target map, scratch for subsequent call
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// -- t0 : scratch (elements)
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// -----------------------------------
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Label entry, loop, convert_hole, gc_required, only_change_map;
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// Check for empty arrays, which only require a map transition and no changes
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// to the backing store.
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__ lw(t0, FieldMemOperand(a2, JSObject::kElementsOffset));
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__ LoadRoot(at, Heap::kEmptyFixedArrayRootIndex);
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__ Branch(&only_change_map, eq, at, Operand(t0));
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__ MultiPush(a0.bit() | a1.bit() | a2.bit() | a3.bit() | ra.bit());
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__ lw(t1, FieldMemOperand(t0, FixedArray::kLengthOffset));
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// t0: source FixedArray
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// t1: number of elements (smi-tagged)
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// Allocate new FixedArray.
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__ sll(a0, t1, 1);
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__ Addu(a0, a0, FixedDoubleArray::kHeaderSize);
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__ AllocateInNewSpace(a0, t2, t3, t5, &gc_required, NO_ALLOCATION_FLAGS);
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// t2: destination FixedArray, not tagged as heap object
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// Set destination FixedDoubleArray's length and map.
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__ LoadRoot(t5, Heap::kFixedArrayMapRootIndex);
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__ sw(t1, MemOperand(t2, FixedDoubleArray::kLengthOffset));
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__ sw(t5, MemOperand(t2, HeapObject::kMapOffset));
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// Prepare for conversion loop.
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__ Addu(t0, t0, Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag + 4));
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__ Addu(a3, t2, Operand(FixedArray::kHeaderSize));
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__ Addu(t2, t2, Operand(kHeapObjectTag));
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__ sll(t1, t1, 1);
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__ Addu(t1, a3, t1);
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__ LoadRoot(t3, Heap::kTheHoleValueRootIndex);
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__ LoadRoot(t5, Heap::kHeapNumberMapRootIndex);
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// Using offsetted addresses.
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// a3: begin of destination FixedArray element fields, not tagged
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// t0: begin of source FixedDoubleArray element fields, not tagged, +4
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// t1: end of destination FixedArray, not tagged
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// t2: destination FixedArray
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// t3: the-hole pointer
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// t5: heap number map
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__ Branch(&entry);
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// Call into runtime if GC is required.
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__ bind(&gc_required);
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__ MultiPop(a0.bit() | a1.bit() | a2.bit() | a3.bit() | ra.bit());
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__ Branch(fail);
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__ bind(&loop);
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__ lw(a1, MemOperand(t0));
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__ Addu(t0, t0, kDoubleSize);
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// a1: current element's upper 32 bit
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// t0: address of next element's upper 32 bit
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__ Branch(&convert_hole, eq, a1, Operand(kHoleNanUpper32));
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// Non-hole double, copy value into a heap number.
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__ AllocateHeapNumber(a2, a0, t6, t5, &gc_required);
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// a2: new heap number
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__ lw(a0, MemOperand(t0, -12));
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__ sw(a0, FieldMemOperand(a2, HeapNumber::kMantissaOffset));
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__ sw(a1, FieldMemOperand(a2, HeapNumber::kExponentOffset));
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__ mov(a0, a3);
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__ sw(a2, MemOperand(a3));
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__ Addu(a3, a3, kIntSize);
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__ RecordWrite(t2,
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a0,
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a2,
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kRAHasBeenSaved,
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kDontSaveFPRegs,
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EMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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__ Branch(&entry);
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// Replace the-hole NaN with the-hole pointer.
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__ bind(&convert_hole);
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__ sw(t3, MemOperand(a3));
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__ Addu(a3, a3, kIntSize);
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__ bind(&entry);
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__ Branch(&loop, lt, a3, Operand(t1));
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__ MultiPop(a2.bit() | a3.bit() | a0.bit() | a1.bit());
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// Replace receiver's backing store with newly created and filled FixedArray.
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__ sw(t2, FieldMemOperand(a2, JSObject::kElementsOffset));
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__ RecordWriteField(a2,
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JSObject::kElementsOffset,
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t2,
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t5,
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kRAHasBeenSaved,
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kDontSaveFPRegs,
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EMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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__ pop(ra);
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__ bind(&only_change_map);
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// Update receiver's map.
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__ sw(a3, FieldMemOperand(a2, HeapObject::kMapOffset));
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__ RecordWriteField(a2,
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HeapObject::kMapOffset,
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a3,
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t5,
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kRAHasNotBeenSaved,
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kDontSaveFPRegs,
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OMIT_REMEMBERED_SET,
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OMIT_SMI_CHECK);
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}
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void StringCharLoadGenerator::Generate(MacroAssembler* masm,
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Register string,
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Register index,
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Register result,
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Label* call_runtime) {
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// Fetch the instance type of the receiver into result register.
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__ lw(result, FieldMemOperand(string, HeapObject::kMapOffset));
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__ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset));
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// We need special handling for indirect strings.
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Label check_sequential;
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__ And(at, result, Operand(kIsIndirectStringMask));
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__ Branch(&check_sequential, eq, at, Operand(zero_reg));
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// Dispatch on the indirect string shape: slice or cons.
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Label cons_string;
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__ And(at, result, Operand(kSlicedNotConsMask));
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__ Branch(&cons_string, eq, at, Operand(zero_reg));
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// Handle slices.
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Label indirect_string_loaded;
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__ lw(result, FieldMemOperand(string, SlicedString::kOffsetOffset));
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__ lw(string, FieldMemOperand(string, SlicedString::kParentOffset));
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__ sra(at, result, kSmiTagSize);
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__ Addu(index, index, at);
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__ jmp(&indirect_string_loaded);
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// Handle cons strings.
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// Check whether the right hand side is the empty string (i.e. if
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// this is really a flat string in a cons string). If that is not
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// the case we would rather go to the runtime system now to flatten
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// the string.
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__ bind(&cons_string);
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__ lw(result, FieldMemOperand(string, ConsString::kSecondOffset));
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__ LoadRoot(at, Heap::kEmptyStringRootIndex);
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__ Branch(call_runtime, ne, result, Operand(at));
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// Get the first of the two strings and load its instance type.
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__ lw(string, FieldMemOperand(string, ConsString::kFirstOffset));
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__ bind(&indirect_string_loaded);
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__ lw(result, FieldMemOperand(string, HeapObject::kMapOffset));
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__ lbu(result, FieldMemOperand(result, Map::kInstanceTypeOffset));
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// Distinguish sequential and external strings. Only these two string
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// representations can reach here (slices and flat cons strings have been
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// reduced to the underlying sequential or external string).
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Label external_string, check_encoding;
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__ bind(&check_sequential);
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STATIC_ASSERT(kSeqStringTag == 0);
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__ And(at, result, Operand(kStringRepresentationMask));
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__ Branch(&external_string, ne, at, Operand(zero_reg));
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// Prepare sequential strings
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STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize);
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__ Addu(string,
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string,
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SeqTwoByteString::kHeaderSize - kHeapObjectTag);
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__ jmp(&check_encoding);
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// Handle external strings.
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__ bind(&external_string);
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if (FLAG_debug_code) {
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// Assert that we do not have a cons or slice (indirect strings) here.
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// Sequential strings have already been ruled out.
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__ And(at, result, Operand(kIsIndirectStringMask));
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__ Assert(eq, "external string expected, but not found",
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at, Operand(zero_reg));
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}
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// Rule out short external strings.
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STATIC_CHECK(kShortExternalStringTag != 0);
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__ And(at, result, Operand(kShortExternalStringMask));
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__ Branch(call_runtime, ne, at, Operand(zero_reg));
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__ lw(string, FieldMemOperand(string, ExternalString::kResourceDataOffset));
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Label ascii, done;
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__ bind(&check_encoding);
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STATIC_ASSERT(kTwoByteStringTag == 0);
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__ And(at, result, Operand(kStringEncodingMask));
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__ Branch(&ascii, ne, at, Operand(zero_reg));
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// Two-byte string.
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__ sll(at, index, 1);
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__ Addu(at, string, at);
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__ lhu(result, MemOperand(at));
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__ jmp(&done);
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__ bind(&ascii);
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// Ascii string.
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__ Addu(at, string, index);
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__ lbu(result, MemOperand(at));
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__ bind(&done);
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}
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#undef __
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} } // namespace v8::internal
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#endif // V8_TARGET_ARCH_MIPS
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