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[D3D12] Adds scalar fallback for the SSE register-range check

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This commit is contained in:
Herman S.
2026-03-17 09:52:13 +09:00
parent b8912a4c79
commit b581c2d852
1 changed files with 27 additions and 16 deletions
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43
src/xenia/gpu/d3d12/d3d12_command_processor.cc
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@@ -1636,8 +1636,11 @@ void D3D12CommandProcessor::ShutdownContext() {
XE_FORCEINLINE
void D3D12CommandProcessor::WriteRegisterForceinline(uint32_t index,
uint32_t value) {
// Parallel range check: is index within any of these GPU register ranges?
// Each range maps to a bit in movmask (by byte pair position).
register_file_->values[index] = value;
#if XE_ARCH_AMD64
__m128i to_rangecheck = _mm_set1_epi16(static_cast<short>(index));
__m128i lower_bounds = _mm_setr_epi16(
XE_GPU_REG_SHADER_CONSTANT_FETCH_00_0 - 1,
XE_GPU_REG_SHADER_CONSTANT_000_X - 1,
@@ -1648,25 +1651,33 @@ void D3D12CommandProcessor::WriteRegisterForceinline(uint32_t index,
XE_GPU_REG_SHADER_CONSTANT_511_W + 1,
XE_GPU_REG_SHADER_CONSTANT_LOOP_31 + 1, XE_GPU_REG_SCRATCH_REG7 + 1,
XE_GPU_REG_COHER_STATUS_HOST + 1, XE_GPU_REG_DC_LUT_30_COLOR + 1, 0, 0);
// quick pre-test
// todo: figure out just how unlikely this is. if very (it ought to be,
// theres a ton of registers other than these) make this predicate
// branchless and mark with unlikely, then make HandleSpecialRegisterWrite
// noinline yep, its very unlikely. these ORS here are meant to be bitwise
// ors, so that we do not do branching evaluation of the conditions (we will
// almost always take all of the branches)
/* unsigned expr =
(index - XE_GPU_REG_SCRATCH_REG0 < 8) |
(index == XE_GPU_REG_COHER_STATUS_HOST) |
((index - XE_GPU_REG_DC_LUT_RW_INDEX) <=
(XE_GPU_REG_DC_LUT_30_COLOR - XE_GPU_REG_DC_LUT_RW_INDEX));*/
__m128i is_above_lower = _mm_cmpgt_epi16(to_rangecheck, lower_bounds);
__m128i is_below_upper = _mm_cmplt_epi16(to_rangecheck, upper_bounds);
__m128i is_within_range = _mm_and_si128(is_above_lower, is_below_upper);
register_file_->values[index] = value;
uint32_t movmask = static_cast<uint32_t>(_mm_movemask_epi8(is_within_range));
#else
auto in_range = [index](uint32_t lo, uint32_t hi) -> uint32_t {
return (index > lo && index < hi) ? 0x3 : 0;
};
uint32_t movmask = 0;
movmask |= in_range(XE_GPU_REG_SHADER_CONSTANT_FETCH_00_0 - 1,
XE_GPU_REG_SHADER_CONSTANT_FETCH_31_5 + 1)
<< 0;
movmask |= in_range(XE_GPU_REG_SHADER_CONSTANT_000_X - 1,
XE_GPU_REG_SHADER_CONSTANT_511_W + 1)
<< 2;
movmask |= in_range(XE_GPU_REG_SHADER_CONSTANT_BOOL_000_031 - 1,
XE_GPU_REG_SHADER_CONSTANT_LOOP_31 + 1)
<< 4;
movmask |= in_range(XE_GPU_REG_SCRATCH_REG0 - 1, XE_GPU_REG_SCRATCH_REG7 + 1)
<< 6;
movmask |= in_range(XE_GPU_REG_COHER_STATUS_HOST - 1,
XE_GPU_REG_COHER_STATUS_HOST + 1)
<< 8;
movmask |=
in_range(XE_GPU_REG_DC_LUT_RW_INDEX - 1, XE_GPU_REG_DC_LUT_30_COLOR + 1)
<< 10;
#endif
if (movmask) {
if (movmask & (1 << 3)) {