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xbyak_abi: Prefer returning a struct to using out parameters in ABI_CalculateFrameSize

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This commit is contained in:
MerryMage 2020-06-15 19:04:29 +01:00 • committed by FearlessTobi
parent a841ce6451
commit 045d20e076
1 changed files with 19 additions and 17 deletions
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36
src/common/x64/xbyak_abi.h
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@ -151,9 +151,13 @@ constexpr std::size_t ABI_SHADOW_SPACE = 0;
#endif
inline void ABI_CalculateFrameSize(BitSet32 regs, std::size_t rsp_alignment,
std::size_t needed_frame_size, s32* out_subtraction,
s32* out_xmm_offset) {
struct ABIFrameInfo {
s32 subtraction;
s32 xmm_offset;
};
inline ABIFrameInfo ABI_CalculateFrameSize(BitSet32 regs, std::size_t rsp_alignment,
std::size_t needed_frame_size) {
int count = (regs & ABI_ALL_GPRS).Count();
rsp_alignment -= count * 8;
std::size_t subtraction = 0;
@ -170,27 +174,26 @@ inline void ABI_CalculateFrameSize(BitSet32 regs, std::size_t rsp_alignment,
rsp_alignment -= subtraction;
subtraction += rsp_alignment & 0xF;
*out_subtraction = (s32)subtraction;
*out_xmm_offset = (s32)(subtraction - xmm_base_subtraction);
return ABIFrameInfo{static_cast<s32>(subtraction),
static_cast<s32>(subtraction - xmm_base_subtraction)};
}
inline std::size_t ABI_PushRegistersAndAdjustStack(Xbyak::CodeGenerator& code, BitSet32 regs,
std::size_t rsp_alignment,
std::size_t needed_frame_size = 0) {
s32 subtraction, xmm_offset;
ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size, &subtraction, &xmm_offset);
auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
for (int reg_index : (regs & ABI_ALL_GPRS)) {
code.push(IndexToReg64(reg_index));
}
if (subtraction != 0) {
code.sub(code.rsp, subtraction);
if (frame_info.subtraction != 0) {
code.sub(code.rsp, frame_info.subtraction);
}
for (int reg_index : (regs & ABI_ALL_XMMS)) {
code.movaps(code.xword[code.rsp + xmm_offset], IndexToXmm(reg_index));
xmm_offset += 0x10;
code.movaps(code.xword[code.rsp + frame_info.xmm_offset], IndexToXmm(reg_index));
frame_info.xmm_offset += 0x10;
}
return ABI_SHADOW_SPACE;
@ -199,16 +202,15 @@ inline std::size_t ABI_PushRegistersAndAdjustStack(Xbyak::CodeGenerator& code, B
inline void ABI_PopRegistersAndAdjustStack(Xbyak::CodeGenerator& code, BitSet32 regs,
std::size_t rsp_alignment,
std::size_t needed_frame_size = 0) {
s32 subtraction, xmm_offset;
ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size, &subtraction, &xmm_offset);
auto frame_info = ABI_CalculateFrameSize(regs, rsp_alignment, needed_frame_size);
for (int reg_index : (regs & ABI_ALL_XMMS)) {
code.movaps(IndexToXmm(reg_index), code.xword[code.rsp + xmm_offset]);
xmm_offset += 0x10;
code.movaps(IndexToXmm(reg_index), code.xword[code.rsp + frame_info.xmm_offset]);
frame_info.xmm_offset += 0x10;
}
if (subtraction != 0) {
code.add(code.rsp, subtraction);
if (frame_info.subtraction != 0) {
code.add(code.rsp, frame_info.subtraction);
}
// GPRs need to be popped in reverse order