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LibJIT: Emit 8-bit displacement variants for mov when possible

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This commit is contained in:
Andreas Kling 2023-10-26 15:29:42 +02:00
parent d09bc54586
commit fb483f1950
1 changed files with 14 additions and 4 deletions
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18
Userland/Libraries/LibJIT/Assembler.h
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@ -140,8 +140,13 @@ struct Assembler {
| ((to_underlying(src.reg) >= 8) ? 1 << 2 : 0) | ((to_underlying(src.reg) >= 8) ? 1 << 2 : 0)
| ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0)); | ((to_underlying(dst.reg) >= 8) ? 1 << 0 : 0));
emit8(0x89); emit8(0x89);
emit8(0x80 | (encode_reg(src.reg) << 3) | encode_reg(dst.reg)); if (dst.offset_or_immediate <= 127) {
emit32(dst.offset_or_immediate); emit8(0x40 | (encode_reg(src.reg) << 3) | encode_reg(dst.reg));
emit8(dst.offset_or_immediate);
} else {
emit8(0x80 | (encode_reg(src.reg) << 3) | encode_reg(dst.reg));
emit32(dst.offset_or_immediate);
}
return; return;
} }
@ -150,8 +155,13 @@ struct Assembler {
| ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0) | ((to_underlying(dst.reg) >= 8) ? 1 << 2 : 0)
| ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0)); | ((to_underlying(src.reg) >= 8) ? 1 << 0 : 0));
emit8(0x8b); emit8(0x8b);
emit8(0x80 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg)); if (src.offset_or_immediate <= 127) {
emit32(src.offset_or_immediate); emit8(0x40 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
emit8(src.offset_or_immediate);
} else {
emit8(0x80 | (encode_reg(dst.reg) << 3) | encode_reg(src.reg));
emit32(src.offset_or_immediate);
}
return; return;
} }