mirrors/ladybird
0
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2025-09-26 19:28:59 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 10

LibJIT: Widen allowed argument range for add32 and use REX if necessary

Browse source 
The REX prefix is elided when it is not needed, so no change in code
size is to be expected
This commit is contained in:
Hendiadyoin1 2023-10-29 14:47:44 +01:00 • committed by Andreas Kling
commit a42d849ec1
Notes: sideshowbarker 2024-07-17 10:31:19 +09:00
1 changed files with 6 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

9
Userland/Libraries/LibJIT/Assembler.h
View file

@ -615,14 +615,17 @@ struct Assembler {
void add32(Operand dst, Operand src, Optional<Label&> label)
{
if (dst.type == Operand::Type::Reg && to_underlying(dst.reg) < 8 && src.type == Operand::Type::Reg && to_underlying(src.reg) < 8) {
if (dst.is_register_or_memory() && src.type == Operand::Type::Reg) {
emit_rex_for_mr(dst, src, REX_W::No);
emit8(0x01);
emit_modrm_mr(dst, src);
} else if (dst.type == Operand::Type::Reg && to_underlying(dst.reg) < 8 && src.type == Operand::Type::Imm && src.fits_in_i8()) {
} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i8()) {
emit_rex_for_slash(dst, REX_W::No);
emit8(0x83);
emit_modrm_slash(0, dst);
emit8(src.offset_or_immediate);
} else if (dst.type == Operand::Type::Reg && to_underlying(dst.reg) < 8 && src.type == Operand::Type::Imm && src.fits_in_i32()) {
} else if (dst.is_register_or_memory() && src.type == Operand::Type::Imm && src.fits_in_i32()) {
emit_rex_for_slash(dst, REX_W::No);
emit8(0x81);
emit_modrm_slash(0, dst);
emit32(src.offset_or_immediate);