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LibJS/JIT: Add fast path for JumpConditional where accumulator is Int32

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This commit is contained in:
Andreas Kling 2023-11-26 15:33:51 +01:00
parent cb46a7fd65
commit b2a1f39400
2 changed files with 35 additions and 56 deletions
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84
Userland/Libraries/LibJS/JIT/Compiler.cpp
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@ -176,72 +176,46 @@ void Compiler::compile_jump(Bytecode::Op::Jump const& op)
m_assembler.jump(label_for(op.true_target()->block()));
}
static bool cxx_to_boolean(VM&, Value value)
static u64 cxx_to_boolean(VM&, Value value)
{
return value.to_boolean_slow_case();
}
void Compiler::compile_to_boolean(Assembler::Reg dst, Assembler::Reg src)
{
// dst = src;
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(src));
// dst >>= 48;
m_assembler.shift_right(
Assembler::Operand::Register(dst),
Assembler::Operand::Imm(48));
// if (dst != BOOLEAN_TAG) goto slow_case;
Assembler::Label slow_case {};
m_assembler.jump_if(
Assembler::Operand::Register(dst),
Assembler::Condition::NotEqualTo,
Assembler::Operand::Imm(BOOLEAN_TAG),
slow_case);
// Fast path for JS::Value booleans.
// dst = src;
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(src));
// goto end;
auto end = m_assembler.jump();
// slow_case: // call C++ helper
slow_case.link(m_assembler);
m_assembler.mov(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Register(src));
native_call((void*)cxx_to_boolean);
m_assembler.mov(
Assembler::Operand::Register(dst),
Assembler::Operand::Register(RET));
// end:
end.link(m_assembler);
// dst &= 1;
m_assembler.bitwise_and(
Assembler::Operand::Register(dst),
Assembler::Operand::Imm(1));
return value.to_boolean();
}
void Compiler::compile_jump_conditional(Bytecode::Op::JumpConditional const& op)
{
load_accumulator(GPR1);
load_accumulator(ARG1);
compile_to_boolean(GPR0, GPR1);
branch_if_boolean(ARG1, [&] {
m_assembler.bitwise_and(
Assembler::Operand::Register(ARG1),
Assembler::Operand::Imm(1));
m_assembler.jump_if(
Assembler::Operand::Register(ARG1),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
label_for(op.false_target()->block()));
m_assembler.jump(label_for(op.true_target()->block()));
});
branch_if_int32(ARG1, [&] {
m_assembler.mov32(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(ARG1));
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
label_for(op.false_target()->block()));
m_assembler.jump(label_for(op.true_target()->block()));
});
native_call((void*)cxx_to_boolean);
m_assembler.jump_if(
Assembler::Operand::Register(GPR0),
Assembler::Operand::Register(RET),
Assembler::Condition::EqualTo,
Assembler::Operand::Imm(0),
label_for(op.false_target()->block()));
m_assembler.jump(label_for(op.true_target()->block()));
}