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[DXBC] Jump to the loop skip address before pushing

This commit is contained in:
Triang3l 2022-05-04 22:01:30 +03:00
parent 0e0f04dc1d
commit 2d90d5940f
1 changed files with 20 additions and 13 deletions
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33
src/xenia/gpu/dxbc_shader_translator.cc
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@ -1814,12 +1814,26 @@ void DxbcShaderTranslator::ProcessLoopStartInstruction(
2 + (instr.loop_constant_index >> 2))
.Select(instr.loop_constant_index & 3));
// Push the count to the loop count stack - move XYZ to YZW and set X to this
// loop count.
a_.OpMov(dxbc::Dest::R(system_temp_loop_count_, 0b1110),
dxbc::Src::R(system_temp_loop_count_, 0b10010000));
a_.OpAnd(dxbc::Dest::R(system_temp_loop_count_, 0b0001), loop_constant_src,
dxbc::Src::LU(UINT8_MAX));
{
uint32_t loop_count_temp = PushSystemTemp();
a_.OpAnd(dxbc::Dest::R(loop_count_temp, 0b0001), loop_constant_src,
dxbc::Src::LU(UINT8_MAX));
// Skip the loop without pushing if the count is zero from the beginning.
a_.OpIf(false, dxbc::Src::R(loop_count_temp, dxbc::Src::kXXXX));
JumpToLabel(instr.loop_skip_address);
a_.OpEndIf();
// Push the count to the loop count stack - move XYZ to YZW and set X to the
// new loop count.
a_.OpMov(dxbc::Dest::R(system_temp_loop_count_, 0b1110),
dxbc::Src::R(system_temp_loop_count_, 0b10010000));
a_.OpMov(dxbc::Dest::R(system_temp_loop_count_, 0b0001),
dxbc::Src::R(loop_count_temp, dxbc::Src::kXXXX));
// Release loop_count_temp.
PopSystemTemp();
}
// Push aL - keep the same value as in the previous loop if repeating, or the
// new one otherwise.
@ -1829,13 +1843,6 @@ void DxbcShaderTranslator::ProcessLoopStartInstruction(
a_.OpUBFE(dxbc::Dest::R(system_temp_aL_, 0b0001), dxbc::Src::LU(8),
dxbc::Src::LU(8), loop_constant_src);
}
// Break if the loop counter is 0 (since the condition is checked in the end).
// TODO(Triang3l): Move this before pushing and address loading. This won't
// pop if the counter is 0.
a_.OpIf(false, dxbc::Src::R(system_temp_loop_count_, dxbc::Src::kXXXX));
JumpToLabel(instr.loop_skip_address);
a_.OpEndIf();
}
void DxbcShaderTranslator::ProcessLoopEndInstruction(