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[maglev] Split interrupt budget updates to separate nodes

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Having interrupt budget updates be part of register allocation caused
various difficulties around gap moves for temporaries vs. gap moves for
phis. This patch splits them off into a separate node which is
separately allocated, and adds invariant checks that phi-updating nodes
don't do any other tricky register allocation.

Bug: v8:7700
Change-Id: I5a454fe4c5a5adff08d5a327ee34fbb43cda97ce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3751196
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81604}
This commit is contained in:
Leszek Swirski 2022-07-08 11:50:15 +02:00 committed by V8 LUCI CQ
parent d34170f294
commit 7ea0412e55
6 changed files with 200 additions and 162 deletions
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38
src/maglev/maglev-graph-builder.cc
View File

@ -1130,11 +1130,8 @@ void MaglevGraphBuilder::InlineCallFromRegisters(
inner_graph_builder.ProcessMergePoint(
inner_graph_builder.inline_exit_offset());
inner_graph_builder.StartNewBlock(inner_graph_builder.inline_exit_offset());
// See also: InterpreterAssembler::UpdateInterruptBudgetOnReturn.
const uint32_t relative_jump_bytecode_offset =
inner_graph_builder.iterator_.current_offset();
BasicBlock* end_block = inner_graph_builder.CreateBlock<JumpFromInlined>(
{}, &end_ref, relative_jump_bytecode_offset);
BasicBlock* end_block =
inner_graph_builder.CreateBlock<JumpFromInlined>({}, &end_ref);
inner_graph_builder.ResolveJumpsToBlockAtOffset(
end_block, inner_graph_builder.inline_exit_offset());
@ -1386,14 +1383,17 @@ void MaglevGraphBuilder::VisitJumpLoop() {
const int32_t loop_offset = iterator_.GetImmediateOperand(1);
const FeedbackSlot feedback_slot = iterator_.GetSlotOperand(2);
int target = iterator_.GetJumpTargetOffset();
if (relative_jump_bytecode_offset > 0) {
AddNewNode<ReduceInterruptBudget>({}, relative_jump_bytecode_offset);
}
BasicBlock* block =
target == iterator_.current_offset()
? FinishBlock<JumpLoop>(next_offset(), {}, &jump_targets_[target],
relative_jump_bytecode_offset, loop_offset,
feedback_slot)
: FinishBlock<JumpLoop>(
next_offset(), {}, jump_targets_[target].block_ptr(),
relative_jump_bytecode_offset, loop_offset, feedback_slot);
loop_offset, feedback_slot)
: FinishBlock<JumpLoop>(next_offset(), {},
jump_targets_[target].block_ptr(),
loop_offset, feedback_slot);
merge_states_[target]->MergeLoop(*compilation_unit_,
current_interpreter_frame_, block, target);
@ -1402,9 +1402,11 @@ void MaglevGraphBuilder::VisitJumpLoop() {
void MaglevGraphBuilder::VisitJump() {
const uint32_t relative_jump_bytecode_offset =
iterator_.GetUnsignedImmediateOperand(0);
if (relative_jump_bytecode_offset > 0) {
AddNewNode<IncreaseInterruptBudget>({}, relative_jump_bytecode_offset);
}
BasicBlock* block = FinishBlock<Jump>(
next_offset(), {}, &jump_targets_[iterator_.GetJumpTargetOffset()],
relative_jump_bytecode_offset);
next_offset(), {}, &jump_targets_[iterator_.GetJumpTargetOffset()]);
MergeIntoFrameState(block, iterator_.GetJumpTargetOffset());
DCHECK_LT(next_offset(), bytecode().length());
}
@ -1545,9 +1547,12 @@ MAGLEV_UNIMPLEMENTED_BYTECODE(ReThrow)
void MaglevGraphBuilder::VisitReturn() {
// See also: InterpreterAssembler::UpdateInterruptBudgetOnReturn.
const uint32_t relative_jump_bytecode_offset = iterator_.current_offset();
if (relative_jump_bytecode_offset > 0) {
AddNewNode<ReduceInterruptBudget>({}, relative_jump_bytecode_offset);
}
if (!is_inline()) {
FinishBlock<Return>(next_offset(), {GetAccumulatorTagged()},
relative_jump_bytecode_offset);
FinishBlock<Return>(next_offset(), {GetAccumulatorTagged()});
return;
}
@ -1556,9 +1561,8 @@ void MaglevGraphBuilder::VisitReturn() {
// execution of the caller.
// TODO(leszeks): Consider shortcutting this Jump for cases where there is
// only one return and no need to merge return states.
BasicBlock* block =
FinishBlock<Jump>(next_offset(), {}, &jump_targets_[inline_exit_offset()],
relative_jump_bytecode_offset);
BasicBlock* block = FinishBlock<Jump>(next_offset(), {},
&jump_targets_[inline_exit_offset()]);
MergeIntoInlinedReturnFrameState(block);
}
MAGLEV_UNIMPLEMENTED_BYTECODE(ThrowReferenceErrorIfHole)

2
src/maglev/maglev-graph-verifier.h
View File

@ -75,6 +75,8 @@ class MaglevGraphVerifier {
case Opcode::kRegisterInput:
case Opcode::kRootConstant:
case Opcode::kSmiConstant:
case Opcode::kIncreaseInterruptBudget:
case Opcode::kReduceInterruptBudget:
// No input.
DCHECK_EQ(node->input_count(), 0);
break;

118
src/maglev/maglev-ir.cc
View File

@ -1543,6 +1543,54 @@ void Construct::GenerateCode(MaglevCodeGenState* code_gen_state,
code_gen_state->DefineLazyDeoptPoint(lazy_deopt_info());
}
void IncreaseInterruptBudget::AllocateVreg(
MaglevVregAllocationState* vreg_state) {
set_temporaries_needed(1);
}
void IncreaseInterruptBudget::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
Register scratch = temporaries().first();
__ movq(scratch, MemOperand(rbp, StandardFrameConstants::kFunctionOffset));
__ LoadTaggedPointerField(
scratch, FieldOperand(scratch, JSFunction::kFeedbackCellOffset));
__ addl(FieldOperand(scratch, FeedbackCell::kInterruptBudgetOffset),
Immediate(amount()));
}
void IncreaseInterruptBudget::PrintParams(
std::ostream& os, MaglevGraphLabeller* graph_labeller) const {
os << "(" << amount() << ")";
}
void ReduceInterruptBudget::AllocateVreg(
MaglevVregAllocationState* vreg_state) {
set_temporaries_needed(1);
}
void ReduceInterruptBudget::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
Register scratch = temporaries().first();
__ movq(scratch, MemOperand(rbp, StandardFrameConstants::kFunctionOffset));
__ LoadTaggedPointerField(
scratch, FieldOperand(scratch, JSFunction::kFeedbackCellOffset));
__ subl(FieldOperand(scratch, FeedbackCell::kInterruptBudgetOffset),
Immediate(amount()));
JumpToDeferredIf(
less, code_gen_state,
[](MaglevCodeGenState* code_gen_state, Label* return_label) {
// TODO(leszeks): Only save registers if they're not free (requires
// fixing the regalloc, same as for scratch).
__ PushCallerSaved(SaveFPRegsMode::kSave);
__ Move(kContextRegister, code_gen_state->native_context().object());
__ Push(MemOperand(rbp, StandardFrameConstants::kFunctionOffset));
__ CallRuntime(Runtime::kBytecodeBudgetInterruptWithStackCheck, 1);
__ PopCallerSaved(SaveFPRegsMode::kSave);
__ jmp(return_label);
});
}
void ReduceInterruptBudget::PrintParams(
std::ostream& os, MaglevGraphLabeller* graph_labeller) const {
os << "(" << amount() << ")";
}
namespace {
void AttemptOnStackReplacement(MaglevCodeGenState* code_gen_state,
@ -1551,46 +1599,6 @@ void AttemptOnStackReplacement(MaglevCodeGenState* code_gen_state,
// InterpreterAssembler::OnStackReplacement.
}
void UpdateInterruptBudgetAndMaybeCallRuntime(
MaglevCodeGenState* code_gen_state, Register scratch,
int32_t relative_jump_bytecode_offset) {
// TODO(v8:7700): Remove once regalloc is fixed. See crrev.com/c/3625978.
__ Push(scratch);
__ movq(scratch, MemOperand(rbp, StandardFrameConstants::kFunctionOffset));
__ LoadTaggedPointerField(
scratch, FieldOperand(scratch, JSFunction::kFeedbackCellOffset));
__ addl(FieldOperand(scratch, FeedbackCell::kInterruptBudgetOffset),
Immediate(relative_jump_bytecode_offset));
// Only check the interrupt if the above add can drop the interrupt budget
// below zero.
if (relative_jump_bytecode_offset < 0) {
JumpToDeferredIf(
less, code_gen_state,
[](MaglevCodeGenState* code_gen_state, Label* return_label) {
// TODO(leszeks): Only save registers if they're not free (requires
// fixing the regalloc, same as for scratch).
__ PushCallerSaved(SaveFPRegsMode::kSave);
__ Move(kContextRegister, code_gen_state->native_context().object());
__ Push(MemOperand(rbp, StandardFrameConstants::kFunctionOffset));
__ CallRuntime(Runtime::kBytecodeBudgetInterruptWithStackCheck, 1);
__ PopCallerSaved(SaveFPRegsMode::kSave);
__ jmp(return_label);
});
}
// TODO(v8:7700): Remove once regalloc is fixed. See crrev.com/c/3625978.
__ Pop(scratch);
}
void UpdateInterruptBudgetAndMaybeCallRuntime(
MaglevCodeGenState* code_gen_state, Register scratch,
base::Optional<uint32_t> relative_jump_bytecode_offset) {
if (!relative_jump_bytecode_offset.has_value()) return;
UpdateInterruptBudgetAndMaybeCallRuntime(
code_gen_state, scratch, relative_jump_bytecode_offset.value());
}
} // namespace
// ---
@ -1603,13 +1611,6 @@ void Return::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
DCHECK_EQ(ToRegister(value_input()), kReturnRegister0);
// We're not going to continue execution, so we can use an arbitrary register
// here instead of relying on temporaries from the register allocator.
Register scratch = r8;
UpdateInterruptBudgetAndMaybeCallRuntime(code_gen_state, scratch,
relative_jump_bytecode_offset_);
// Read the formal number of parameters from the top level compilation unit
// (i.e. the outermost, non inlined function).
int formal_params_size = code_gen_state->compilation_info()
@ -1618,7 +1619,7 @@ void Return::GenerateCode(MaglevCodeGenState* code_gen_state,
// We're not going to continue execution, so we can use an arbitrary register
// here instead of relying on temporaries from the register allocator.
Register actual_params_size = scratch;
Register actual_params_size = r8;
// Compute the size of the actual parameters + receiver (in bytes).
// TODO(leszeks): Consider making this an input into Return to re-use the
@ -1652,14 +1653,9 @@ void Deopt::GenerateCode(MaglevCodeGenState* code_gen_state,
EmitEagerDeopt(code_gen_state, this);
}
void Jump::AllocateVreg(MaglevVregAllocationState* vreg_state) {
set_temporaries_needed(1);
}
void Jump::AllocateVreg(MaglevVregAllocationState* vreg_state) {}
void Jump::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
UpdateInterruptBudgetAndMaybeCallRuntime(
code_gen_state, temporaries().PopFirst(), relative_jump_bytecode_offset_);
// Avoid emitting a jump to the next block.
if (target() != state.next_block()) {
__ jmp(target()->label());
@ -1679,29 +1675,19 @@ void JumpToInlined::PrintParams(std::ostream& os,
os << "(" << Brief(*unit()->shared_function_info().object()) << ")";
}
void JumpFromInlined::AllocateVreg(MaglevVregAllocationState* vreg_state) {
set_temporaries_needed(1);
}
void JumpFromInlined::AllocateVreg(MaglevVregAllocationState* vreg_state) {}
void JumpFromInlined::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
UpdateInterruptBudgetAndMaybeCallRuntime(
code_gen_state, temporaries().PopFirst(), relative_jump_bytecode_offset_);
// Avoid emitting a jump to the next block.
if (target() != state.next_block()) {
__ jmp(target()->label());
}
}
void JumpLoop::AllocateVreg(MaglevVregAllocationState* vreg_state) {
set_temporaries_needed(1);
}
void JumpLoop::AllocateVreg(MaglevVregAllocationState* vreg_state) {}
void JumpLoop::GenerateCode(MaglevCodeGenState* code_gen_state,
const ProcessingState& state) {
AttemptOnStackReplacement(code_gen_state, loop_depth_, feedback_slot_);
UpdateInterruptBudgetAndMaybeCallRuntime(code_gen_state,
temporaries().PopFirst(),
-relative_jump_bytecode_offset_);
__ jmp(target()->label());
}

95
src/maglev/maglev-ir.h
View File

@ -144,13 +144,15 @@ class CompactInterpreterFrameState;
V(ConstantGapMove) \
V(GapMove)
#define NODE_LIST(V) \
V(CheckMaps) \
V(CheckSmi) \
V(CheckHeapObject) \
V(CheckMapsWithMigration) \
V(StoreField) \
GAP_MOVE_NODE_LIST(V) \
#define NODE_LIST(V) \
V(CheckMaps) \
V(CheckSmi) \
V(CheckHeapObject) \
V(CheckMapsWithMigration) \
V(StoreField) \
V(IncreaseInterruptBudget) \
V(ReduceInterruptBudget) \
GAP_MOVE_NODE_LIST(V) \
VALUE_NODE_LIST(V)
#define CONDITIONAL_CONTROL_NODE_LIST(V) \
@ -2111,6 +2113,45 @@ class Construct : public ValueNodeT<Construct> {
void PrintParams(std::ostream&, MaglevGraphLabeller*) const {}
};
class IncreaseInterruptBudget
: public FixedInputNodeT<0, IncreaseInterruptBudget> {
using Base = FixedInputNodeT<0, IncreaseInterruptBudget>;
public:
explicit IncreaseInterruptBudget(uint64_t bitfield, int amount)
: Base(bitfield), amount_(amount) {
DCHECK_GT(amount, 0);
}
int amount() const { return amount_; }
void AllocateVreg(MaglevVregAllocationState*);
void GenerateCode(MaglevCodeGenState*, const ProcessingState&);
void PrintParams(std::ostream&, MaglevGraphLabeller*) const;
private:
const int amount_;
};
class ReduceInterruptBudget : public FixedInputNodeT<0, ReduceInterruptBudget> {
using Base = FixedInputNodeT<0, ReduceInterruptBudget>;
public:
explicit ReduceInterruptBudget(uint64_t bitfield, int amount)
: Base(bitfield), amount_(amount) {
DCHECK_GT(amount, 0);
}
int amount() const { return amount_; }
void AllocateVreg(MaglevVregAllocationState*);
void GenerateCode(MaglevCodeGenState*, const ProcessingState&);
void PrintParams(std::ostream&, MaglevGraphLabeller*) const;
private:
const int amount_;
};
// Represents either a direct BasicBlock pointer, or an entry in a list of
// unresolved BasicBlockRefs which will be mutated (in place) at some point into
// direct BasicBlock pointers.
@ -2319,37 +2360,27 @@ class Jump : public UnconditionalControlNodeT<Jump> {
using Base = UnconditionalControlNodeT<Jump>;
public:
Jump(uint64_t bitfield, BasicBlockRef* target_refs,
base::Optional<uint32_t> relative_jump_bytecode_offset = {})
: Base(bitfield, target_refs),
relative_jump_bytecode_offset_(relative_jump_bytecode_offset) {}
Jump(uint64_t bitfield, BasicBlockRef* target_refs)
: Base(bitfield, target_refs) {}
void AllocateVreg(MaglevVregAllocationState*);
void GenerateCode(MaglevCodeGenState*, const ProcessingState&);
void PrintParams(std::ostream&, MaglevGraphLabeller*) const {}
private:
// For maintaining the interrupt_budget.
const base::Optional<uint32_t> relative_jump_bytecode_offset_;
};
class JumpLoop : public UnconditionalControlNodeT<JumpLoop> {
using Base = UnconditionalControlNodeT<JumpLoop>;
public:
explicit JumpLoop(uint64_t bitfield, BasicBlock* target,
uint32_t relative_jump_bytecode_offset, int32_t loop_depth,
explicit JumpLoop(uint64_t bitfield, BasicBlock* target, int32_t loop_depth,
FeedbackSlot feedback_slot)
: Base(bitfield, target),
relative_jump_bytecode_offset_(relative_jump_bytecode_offset),
loop_depth_(loop_depth),
feedback_slot_(feedback_slot) {}
explicit JumpLoop(uint64_t bitfield, BasicBlockRef* ref,
uint32_t relative_jump_bytecode_offset, int32_t loop_depth,
explicit JumpLoop(uint64_t bitfield, BasicBlockRef* ref, int32_t loop_depth,
FeedbackSlot feedback_slot)
: Base(bitfield, ref),
relative_jump_bytecode_offset_(relative_jump_bytecode_offset),
loop_depth_(loop_depth),
feedback_slot_(feedback_slot) {}
@ -2358,8 +2389,6 @@ class JumpLoop : public UnconditionalControlNodeT<JumpLoop> {
void PrintParams(std::ostream&, MaglevGraphLabeller*) const {}
private:
// For maintaining the interrupt_budget.
const uint32_t relative_jump_bytecode_offset_;
// For OSR.
const int32_t loop_depth_;
const FeedbackSlot feedback_slot_;
@ -2387,27 +2416,17 @@ class JumpFromInlined : public UnconditionalControlNodeT<JumpFromInlined> {
using Base = UnconditionalControlNodeT<JumpFromInlined>;
public:
explicit JumpFromInlined(
uint64_t bitfield, BasicBlockRef* target_refs,
base::Optional<uint32_t> relative_jump_bytecode_offset = {})
: Base(bitfield, target_refs),
relative_jump_bytecode_offset_(relative_jump_bytecode_offset) {}
explicit JumpFromInlined(uint64_t bitfield, BasicBlockRef* target_refs)
: Base(bitfield, target_refs) {}
void AllocateVreg(MaglevVregAllocationState*);
void GenerateCode(MaglevCodeGenState*, const ProcessingState&);
void PrintParams(std::ostream&, MaglevGraphLabeller*) const {}
private:
// For maintaining the interrupt_budget.
const base::Optional<uint32_t> relative_jump_bytecode_offset_;
};
class Return : public ControlNode {
public:
explicit Return(uint64_t bitfield,
base::Optional<uint32_t> relative_jump_bytecode_offset = {})
: ControlNode(bitfield),
relative_jump_bytecode_offset_(relative_jump_bytecode_offset) {
explicit Return(uint64_t bitfield) : ControlNode(bitfield) {
DCHECK_EQ(NodeBase::opcode(), opcode_of<Return>);
}
@ -2416,10 +2435,6 @@ class Return : public ControlNode {
void AllocateVreg(MaglevVregAllocationState*);
void GenerateCode(MaglevCodeGenState*, const ProcessingState&);
void PrintParams(std::ostream&, MaglevGraphLabeller*) const {}
private:
// For maintaining the interrupt_budget.
const base::Optional<uint32_t> relative_jump_bytecode_offset_;
};
class Deopt : public ControlNode {

107
src/maglev/maglev-regalloc.cc
View File

@ -682,59 +682,90 @@ void StraightForwardRegisterAllocator::AllocateControlNode(ControlNode* node,
BasicBlock* block) {
current_node_ = node;
// We first allocate fixed inputs (including fixed temporaries), then inject
// phis (because these may be fixed too), and finally arbitrary inputs and
// temporaries.
for (Input& input : *node) AssignFixedInput(input);
AssignFixedTemporaries(node);
// Control nodes can't lazy deopt at the moment.
DCHECK(!node->properties().can_lazy_deopt());
if (node->Is<JumpToInlined>()) {
// Do nothing.
// TODO(leszeks): DCHECK any useful invariants here.
DCHECK(node->temporaries().is_empty());
DCHECK_EQ(node->num_temporaries_needed(), 0);
DCHECK_EQ(node->input_count(), 0);
DCHECK_EQ(node->properties(), OpProperties(0));
if (FLAG_trace_maglev_regalloc) {
printing_visitor_->Process(node,
ProcessingState(compilation_info_, block_it_));
}
} else if (node->Is<Deopt>()) {
// No fixed temporaries.
DCHECK(node->temporaries().is_empty());
DCHECK_EQ(node->num_temporaries_needed(), 0);
DCHECK_EQ(node->input_count(), 0);
DCHECK_EQ(node->properties(), OpProperties::EagerDeopt());
UpdateUse(*node->eager_deopt_info());
if (FLAG_trace_maglev_regalloc) {
printing_visitor_->Process(node,
ProcessingState(compilation_info_, block_it_));
}
} else if (auto unconditional = node->TryCast<UnconditionalControlNode>()) {
// No fixed temporaries.
DCHECK(node->temporaries().is_empty());
DCHECK_EQ(node->num_temporaries_needed(), 0);
DCHECK_EQ(node->input_count(), 0);
DCHECK(!node->properties().can_eager_deopt());
DCHECK(!node->properties().can_lazy_deopt());
// Initialize phis before assigning inputs, in case one of the inputs
// conflicts with a fixed phi.
InitializeBranchTargetPhis(block->predecessor_id(),
unconditional->target());
}
for (Input& input : *node) AssignArbitraryRegisterInput(input);
AssignArbitraryTemporaries(node);
DCHECK(!node->properties().is_call());
VerifyInputs(node);
general_registers_.clear_blocked();
double_registers_.clear_blocked();
VerifyRegisterState();
if (node->properties().can_eager_deopt()) {
UpdateUse(*node->eager_deopt_info());
}
for (Input& input : *node) UpdateUse(&input);
if (FLAG_trace_maglev_regalloc) {
printing_visitor_->Process(node,
ProcessingState(compilation_info_, block_it_));
}
if (node->properties().is_call()) SpillAndClearRegisters();
DCHECK_EQ(general_registers_.free() | node->temporaries(),
general_registers_.free());
general_registers_.clear_blocked();
double_registers_.clear_blocked();
VerifyRegisterState();
if (FLAG_trace_maglev_regalloc) {
printing_visitor_->Process(node,
ProcessingState(compilation_info_, block_it_));
}
// Finally, initialize the merge states of branch targets, including the
// fallthrough, with the final state after all allocation
if (node->Is<JumpToInlined>()) {
// Do nothing.
// TODO(leszeks): DCHECK any useful invariants here.
} else if (auto unconditional = node->TryCast<UnconditionalControlNode>()) {
// Merge register values. Values only flowing into phis and not being
// independently live will be killed as part of the merge.
MergeRegisterValues(unconditional, unconditional->target(),
block->predecessor_id());
} else if (auto conditional = node->TryCast<ConditionalControlNode>()) {
InitializeConditionalBranchTarget(conditional, conditional->if_true());
InitializeConditionalBranchTarget(conditional, conditional->if_false());
} else {
DCHECK(node->Is<ConditionalControlNode>() || node->Is<Return>());
AssignInputs(node);
VerifyInputs(node);
DCHECK(!node->properties().can_eager_deopt());
for (Input& input : *node) UpdateUse(&input);
DCHECK(!node->properties().can_lazy_deopt());
if (node->properties().is_call()) SpillAndClearRegisters();
DCHECK_EQ(general_registers_.free() | node->temporaries(),
general_registers_.free());
general_registers_.clear_blocked();
double_registers_.clear_blocked();
VerifyRegisterState();
if (FLAG_trace_maglev_regalloc) {
printing_visitor_->Process(node,
ProcessingState(compilation_info_, block_it_));
}
// Finally, initialize the merge states of branch targets, including the
// fallthrough, with the final state after all allocation
if (auto conditional = node->TryCast<ConditionalControlNode>()) {
InitializeConditionalBranchTarget(conditional, conditional->if_true());
InitializeConditionalBranchTarget(conditional, conditional->if_false());
}
}
VerifyRegisterState();
@ -906,7 +937,7 @@ void StraightForwardRegisterAllocator::AssignArbitraryRegisterInput(
}
}
void StraightForwardRegisterAllocator::AssignInputs(Node* node) {
void StraightForwardRegisterAllocator::AssignInputs(NodeBase* node) {
// We allocate arbitrary register inputs after fixed inputs, since the fixed
// inputs may clobber the arbitrarily chosen ones.
for (Input& input : *node) AssignFixedInput(input);

2
src/maglev/maglev-regalloc.h
View File

@ -143,7 +143,7 @@ class StraightForwardRegisterAllocator {
void AllocateNodeResult(ValueNode* node);
void AssignFixedInput(Input& input);
void AssignArbitraryRegisterInput(Input& input);
void AssignInputs(Node* node);
void AssignInputs(NodeBase* node);
void AssignFixedTemporaries(NodeBase* node);
void AssignArbitraryTemporaries(NodeBase* node);
void TryAllocateToInput(Phi* phi);