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LibJS/Bytecode: Do basic compare-and-jump peephole optimization

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We now fuse sequences like [LessThan, JumpIf] to JumpLessThan.
This is only allowed for temporaries (i.e VM registers) with no other
references to them.
This commit is contained in:
Andreas Kling 2024-05-09 15:13:31 +02:00 • committed by Alexander Kalenik
commit 7654da3851
Notes: sideshowbarker 2024-07-18 00:41:35 +09:00
8 changed files with 166 additions and 28 deletions
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7
Userland/Libraries/LibJS/Bytecode/Generator.h
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@ -77,6 +77,7 @@ public:
{
VERIFY(!is_current_block_terminated());
size_t slot_offset = m_current_basic_block->size();
m_current_basic_block->set_last_instruction_start_offset(slot_offset);
grow(sizeof(OpType));
void* slot = m_current_basic_block->data() + slot_offset;
new (slot) OpType(forward<Args>(args)...);
@ -93,6 +94,7 @@ public:
size_t size_to_allocate = round_up_to_power_of_two(sizeof(OpType) + extra_slot_count * sizeof(ExtraSlotType), alignof(void*));
size_t slot_offset = m_current_basic_block->size();
m_current_basic_block->set_last_instruction_start_offset(slot_offset);
grow(size_to_allocate);
void* slot = m_current_basic_block->data() + slot_offset;
new (slot) OpType(forward<Args>(args)...);
@ -115,6 +117,8 @@ public:
emit_with_extra_slots<OpType, Value>(extra_operand_slots, forward<Args>(args)...);
}
void emit_jump_if(ScopedOperand const& condition, Label true_target, Label false_target);
struct ReferenceOperands {
Optional<ScopedOperand> base {}; // [[Base]]
Optional<ScopedOperand> referenced_name {}; // [[ReferencedName]] as an operand
@ -309,6 +313,9 @@ private:
void grow(size_t);
// Returns true if a fused instruction was emitted.
[[nodiscard]] bool fuse_compare_and_jump(ScopedOperand const& condition, Label true_target, Label false_target);
struct LabelableScope {
Label bytecode_target;
Vector<DeprecatedFlyString> language_label_set;