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x64Emitter: Reduce padding in OpArg

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By moving members of the OpArg struct around, we can cut down on how
much padding the struct needs. Now it has a size of 16 bytes, small
enough for function calls to pass it in two registers instead of on the
stack.
This commit is contained in:
JosJuice
2026-01-11 18:37:29 +01:00
parent 89a03199b1
commit 283218bc29
1 changed files with 4 additions and 4 deletions
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8
Source/Core/Common/x64Emitter.h
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@@ -113,8 +113,8 @@ struct OpArg
// dummy op arg, used for storage
constexpr OpArg() = default;
constexpr OpArg(u64 offset_, int scale_, X64Reg rm_reg = RAX, X64Reg scaled_reg = RAX)
: scale{static_cast<u8>(scale_)}, offsetOrBaseReg{static_cast<u16>(rm_reg)},
indexReg{static_cast<u16>(scaled_reg)}, offset{offset_}
: offset{offset_}, offsetOrBaseReg{static_cast<u16>(rm_reg)},
indexReg{static_cast<u16>(scaled_reg)}, scale{static_cast<u8>(scale_)}
{
}
constexpr bool operator==(const OpArg& b) const
@@ -234,11 +234,11 @@ private:
void WriteSingleByteOp(XEmitter* emit, u8 op, X64Reg operandReg, int bits);
void WriteNormalOp(XEmitter* emit, bool toRM, NormalOp op, const OpArg& operand, int bits) const;
u8 scale = 0;
u64 offset = 0; // Also used to store immediates.
u16 offsetOrBaseReg = 0;
u16 indexReg = 0;
u64 offset = 0; // Also used to store immediates.
u16 operandReg = 0;
u8 scale = 0;
};
template <typename T>