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LibJS/JIT: Add Assembler::jump_if_equal()

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And also factor out cmp() so we don't have to repeat it.
This commit is contained in:
Andreas Kling 2023-10-17 18:03:17 +02:00
parent a7bad26b63
commit 814b07a9c2
1 changed files with 17 additions and 2 deletions
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19
Userland/Libraries/LibJS/JIT/Assembler.h
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@ -231,9 +231,8 @@ struct Assembler {
jump(true_target); jump(true_target);
} }
void jump_if_not_equal(Operand lhs, Operand rhs, Label& label) void cmp(Operand lhs, Operand rhs)
{ {
// cmp lhs, rhs
if (lhs.type == Operand::Type::Reg && rhs.type == Operand::Type::Reg) { if (lhs.type == Operand::Type::Reg && rhs.type == Operand::Type::Reg) {
emit8(0x48 emit8(0x48
| ((to_underlying(lhs.reg) >= 8) ? 1 << 2 : 0) | ((to_underlying(lhs.reg) >= 8) ? 1 << 2 : 0)
@ -248,6 +247,22 @@ struct Assembler {
} else { } else {
VERIFY_NOT_REACHED(); VERIFY_NOT_REACHED();
} }
}
void jump_if_equal(Operand lhs, Operand rhs, Label& label)
{
cmp(lhs, rhs);
// je label (RIP-relative 32-bit offset)
emit8(0x0f);
emit8(0x84);
emit32(0xdeadbeef);
label.offset_in_instruction_stream = m_output.size();
}
void jump_if_not_equal(Operand lhs, Operand rhs, Label& label)
{
cmp(lhs, rhs);
// jne label (RIP-relative 32-bit offset) // jne label (RIP-relative 32-bit offset)
emit8(0x0f); emit8(0x0f);