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LibJIT: Add mov8/mov16/mov32 with zero- or sign-extension

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This commit is contained in:
Simon Wanner 2023-11-07 14:27:58 +01:00 committed by Andreas Kling
parent 2bab266ba9
commit ff63222425
1 changed files with 43 additions and 4 deletions
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47
Userland/Libraries/LibJIT/X86_64/Assembler.h
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@ -324,6 +324,48 @@ struct X86_64Assembler {
VERIFY_NOT_REACHED();
}
enum Extension {
ZeroExtend,
SignExtend,
};
void mov8(Operand dst, Operand src, Extension extension = Extension::ZeroExtend)
{
VERIFY(dst.type == Operand::Type::Reg && src.type == Operand::Type::Mem64BaseAndOffset);
// mov[sz]x r32, r/m8
emit_rex_for_rm(dst, src, REX_W::No);
emit8(0x0f);
emit8(extension == Extension::ZeroExtend ? 0xb6 : 0xbe);
emit_modrm_rm(dst, src);
}
void mov16(Operand dst, Operand src, Extension extension = Extension::ZeroExtend)
{
VERIFY(dst.type == Operand::Type::Reg && src.is_register_or_memory());
// mov[sz]x r32, r/m16
emit_rex_for_rm(dst, src, REX_W::No);
emit8(0x0f);
emit8(extension == Extension::ZeroExtend ? 0xb7 : 0xbf);
emit_modrm_rm(dst, src);
}
void mov32(Operand dst, Operand src, Extension extension = Extension::ZeroExtend)
{
VERIFY(dst.type == Operand::Type::Reg && src.is_register_or_memory());
if (extension == Extension::ZeroExtend) {
// mov r32, r/m32
emit_rex_for_rm(dst, src, REX_W::No);
emit8(0x8b);
emit_modrm_rm(dst, src);
return;
}
VERIFY(extension == Extension::SignExtend);
// movsxd r64, r/m32
emit_rex_for_rm(dst, src, REX_W::Yes);
emit8(0x63);
emit_modrm_rm(dst, src);
}
void emit8(u8 value)
{
m_output.append(value);
@ -473,10 +515,7 @@ struct X86_64Assembler {
void sign_extend_32_to_64_bits(Reg reg)
{
// movsxd (reg as 64-bit), (reg as 32-bit)
emit_rex_for_rm(Operand::Register(reg), Operand::Register(reg), REX_W::Yes);
emit8(0x63);
emit_modrm_rm(Operand::Register(reg), Operand::Register(reg));
mov32(Operand::Register(reg), Operand::Register(reg), Extension::SignExtend);
}
void bitwise_and(Operand dst, Operand src)