bool
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
MAsmJSLoadHeap *mir = ins->mir();
Scalar::Type vt = mir->viewType();
const LAllocation *ptr = ins->ptr();
const LDefinition *out = ins->output();
Operand srcAddr(HeapReg);
if (ptr->isConstant()) {
int32_t ptrImm = ptr->toConstant()->toInt32();
JS_ASSERT(ptrImm >= 0);
srcAddr = Operand(HeapReg, ptrImm);
} else {
srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
}
OutOfLineLoadTypedArrayOutOfBounds *ool = nullptr;
uint32_t maybeCmpOffset = AsmJSHeapAccess::NoLengthCheck;
if (!mir->skipBoundsCheck()) {
bool isFloat32Load = vt == Scalar::Float32;
ool = new(alloc()) OutOfLineLoadTypedArrayOutOfBounds(ToAnyRegister(out), isFloat32Load);
if (!addOutOfLineCode(ool, ins->mir()))
return false;
CodeOffsetLabel cmp = masm.cmplWithPatch(ToRegister(ptr), Imm32(0));
masm.j(Assembler::AboveOrEqual, ool->entry());
maybeCmpOffset = cmp.offset();
}
uint32_t before = masm.size();
switch (vt) {
case Scalar::Int8: masm.movsbl(srcAddr, ToRegister(out)); break;
case Scalar::Uint8: masm.movzbl(srcAddr, ToRegister(out)); break;
case Scalar::Int16: masm.movswl(srcAddr, ToRegister(out)); break;
case Scalar::Uint16: masm.movzwl(srcAddr, ToRegister(out)); break;
case Scalar::Int32:
case Scalar::Uint32: masm.movl(srcAddr, ToRegister(out)); break;
case Scalar::Float32: masm.loadFloat32(srcAddr, ToFloatRegister(out)); break;
case Scalar::Float64: masm.loadDouble(srcAddr, ToFloatRegister(out)); break;
default: MOZ_CRASH("unexpected array type");
}
uint32_t after = masm.size();
if (ool)
masm.bind(ool->rejoin());
masm.append(AsmJSHeapAccess(before, after, vt, ToAnyRegister(out), maybeCmpOffset));
return true;
}
bool
CodeGeneratorX64::visitAsmJSLoadHeap(LAsmJSLoadHeap *ins)
{
MAsmJSLoadHeap *mir = ins->mir();
ArrayBufferView::ViewType vt = mir->viewType();
const LAllocation *ptr = ins->ptr();
// No need to note the access if it will never fault.
bool skipNote = mir->skipBoundsCheck();
Operand srcAddr(HeapReg);
if (ptr->isConstant()) {
int32_t ptrImm = ptr->toConstant()->toInt32();
// Note only a positive index is accepted here because a negative offset would
// not wrap back into the protected area reserved for the heap.
JS_ASSERT(ptrImm >= 0);
srcAddr = Operand(HeapReg, ptrImm);
} else {
srcAddr = Operand(HeapReg, ToRegister(ptr), TimesOne);
}
if (vt == ArrayBufferView::TYPE_FLOAT32) {
FloatRegister dest = ToFloatRegister(ins->output());
uint32_t before = masm.size();
masm.movss(srcAddr, dest);
uint32_t after = masm.size();
masm.cvtss2sd(dest, dest);
return skipNote || gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
}
uint32_t before = masm.size();
switch (vt) {
case ArrayBufferView::TYPE_INT8: masm.movsbl(srcAddr, ToRegister(ins->output())); break;
case ArrayBufferView::TYPE_UINT8: masm.movzbl(srcAddr, ToRegister(ins->output())); break;
case ArrayBufferView::TYPE_INT16: masm.movswl(srcAddr, ToRegister(ins->output())); break;
case ArrayBufferView::TYPE_UINT16: masm.movzwl(srcAddr, ToRegister(ins->output())); break;
case ArrayBufferView::TYPE_INT32:
case ArrayBufferView::TYPE_UINT32: masm.movl(srcAddr, ToRegister(ins->output())); break;
case ArrayBufferView::TYPE_FLOAT64: masm.movsd(srcAddr, ToFloatRegister(ins->output())); break;
default: MOZ_ASSUME_UNREACHABLE("unexpected array type");
}
uint32_t after = masm.size();
return skipNote || gen->noteHeapAccess(AsmJSHeapAccess(before, after, vt, ToAnyRegister(ins->output())));
}