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LibJS/Bytecode: Dedicated instructions for postfix increment/decrement

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Instead of splitting the postfix variants into ToNumeric + Inc/Dec,
we now have dedicated PostfixIncrement and PostfixDecrement instructions
that handle both outputs in one go.
This commit is contained in:
Andreas Kling
2024-02-20 11:45:01 +01:00
parent c4f49e343a
commit 9d9b737a58
Notes: sideshowbarker 2024-07-17 03:00:02 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/9d9b737a58
Pull-request: https://github.com/SerenityOS/serenity/pull/23269
4 changed files with 96 additions and 27 deletions
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71
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -1113,6 +1113,31 @@ ThrowCompletionOr<void> Increment::execute_impl(Bytecode::Interpreter& interpret
return {};
}
ThrowCompletionOr<void> PostfixIncrement::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto old_value = interpreter.get(m_src);
// OPTIMIZATION: Fast path for Int32 values.
if (old_value.is_int32()) {
auto integer_value = old_value.as_i32();
if (integer_value != NumericLimits<i32>::max()) [[likely]] {
interpreter.set(m_dst, old_value);
interpreter.set(m_src, Value { integer_value + 1 });
return {};
}
}
old_value = TRY(old_value.to_numeric(vm));
interpreter.set(m_dst, old_value);
if (old_value.is_number())
interpreter.set(m_src, Value(old_value.as_double() + 1));
else
interpreter.set(m_src, BigInt::create(vm, old_value.as_bigint().big_integer().plus(Crypto::SignedBigInteger { 1 })));
return {};
}
ThrowCompletionOr<void> Decrement::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
@@ -1127,6 +1152,21 @@ ThrowCompletionOr<void> Decrement::execute_impl(Bytecode::Interpreter& interpret
return {};
}
ThrowCompletionOr<void> PostfixDecrement::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto old_value = interpreter.get(m_src);
old_value = TRY(old_value.to_numeric(vm));
interpreter.set(m_dst, old_value);
if (old_value.is_number())
interpreter.set(m_src, Value(old_value.as_double() - 1));
else
interpreter.set(m_src, BigInt::create(vm, old_value.as_bigint().big_integer().minus(Crypto::SignedBigInteger { 1 })));
return {};
}
ThrowCompletionOr<void> Throw::execute_impl(Bytecode::Interpreter& interpreter) const
{
return throw_completion(interpreter.get(src()));
@@ -1356,12 +1396,6 @@ ThrowCompletionOr<void> TypeofVariable::execute_impl(Bytecode::Interpreter& inte
return {};
}
ThrowCompletionOr<void> ToNumeric::execute_impl(Bytecode::Interpreter& interpreter) const
{
interpreter.set(dst(), TRY(interpreter.get(src()).to_numeric(interpreter.vm())));
return {};
}
ThrowCompletionOr<void> BlockDeclarationInstantiation::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
@@ -1763,9 +1797,23 @@ ByteString Increment::to_byte_string_impl(Bytecode::Executable const& executable
return ByteString::formatted("Increment {}", format_operand("dst"sv, m_dst, executable));
}
ByteString Decrement::to_byte_string_impl(Bytecode::Executable const&) const
ByteString PostfixIncrement::to_byte_string_impl(Bytecode::Executable const& executable) const
{
return "Decrement";
return ByteString::formatted("PostfixIncrement {}, {}",
format_operand("dst"sv, m_dst, executable),
format_operand("src"sv, m_dst, executable));
}
ByteString Decrement::to_byte_string_impl(Bytecode::Executable const& executable) const
{
return ByteString::formatted("Decrement {}", format_operand("dst"sv, m_dst, executable));
}
ByteString PostfixDecrement::to_byte_string_impl(Bytecode::Executable const& executable) const
{
return ByteString::formatted("PostfixDecrement {}, {}",
format_operand("dst"sv, m_dst, executable),
format_operand("src"sv, m_dst, executable));
}
ByteString Throw::to_byte_string_impl(Bytecode::Executable const& executable) const
@@ -1974,13 +2022,6 @@ ByteString TypeofVariable::to_byte_string_impl(Bytecode::Executable const& execu
executable.identifier_table->get(m_identifier));
}
ByteString ToNumeric::to_byte_string_impl(Bytecode::Executable const& executable) const
{
return ByteString::formatted("ToNumeric {}, {}",
format_operand("dst"sv, m_dst, executable),
format_operand("src"sv, m_src, executable));
}
ByteString BlockDeclarationInstantiation::to_byte_string_impl(Bytecode::Executable const&) const
{
return "BlockDeclarationInstantiation"sv;