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aco: don't assume src=lower when splitting self-intersecting copies

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Fixes: 09c584caeb ("aco: split self-intersecting copies instead of swapping")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7798>
This commit is contained in:
Rhys Perry 2020-12-03 19:55:10 +00:00 • committed by Marge Bot
parent 741921e2ff
commit 2c40846ab6
1 changed files with 13 additions and 16 deletions
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29
src/amd/compiler/aco_lower_to_hw_instr.cpp
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@ -1613,31 +1613,28 @@ void handle_operands(std::map<PhysReg, copy_operation>& copy_map, lower_context*
/* if this is self-intersecting, we have to split it because
* self-intersecting swaps don't make sense */
PhysReg lower = swap.def.physReg();
PhysReg higher = swap.op.physReg();
if (lower.reg_b > higher.reg_b)
std::swap(lower, higher);
if (higher.reg_b - lower.reg_b < (int)swap.bytes) {
unsigned offset = higher.reg_b - lower.reg_b;
PhysReg src = swap.op.physReg(), dst = swap.def.physReg();
if (abs((int)src.reg_b - (int)dst.reg_b) < (int)swap.bytes) {
unsigned offset = abs((int)src.reg_b - (int)dst.reg_b);
RegType type = swap.def.regClass().type();
copy_operation middle;
lower.reg_b += offset;
higher.reg_b += offset;
src.reg_b += offset;
dst.reg_b += offset;
middle.bytes = swap.bytes - offset * 2;
memcpy(middle.uses, swap.uses + offset, middle.bytes);
middle.op = Operand(lower, RegClass::get(type, middle.bytes));
middle.def = Definition(higher, RegClass::get(type, middle.bytes));
copy_map[higher] = middle;
middle.op = Operand(src, RegClass::get(type, middle.bytes));
middle.def = Definition(dst, RegClass::get(type, middle.bytes));
copy_map[dst] = middle;
copy_operation end;
lower.reg_b += middle.bytes;
higher.reg_b += middle.bytes;
src.reg_b += middle.bytes;
dst.reg_b += middle.bytes;
end.bytes = swap.bytes - (offset + middle.bytes);
memcpy(end.uses, swap.uses + offset + middle.bytes, end.bytes);
end.op = Operand(lower, RegClass::get(type, end.bytes));
end.def = Definition(higher, RegClass::get(type, end.bytes));
copy_map[higher] = end;
end.op = Operand(src, RegClass::get(type, end.bytes));
end.def = Definition(dst, RegClass::get(type, end.bytes));
copy_map[dst] = end;
memset(swap.uses + offset, 0, swap.bytes - offset);
swap.bytes = offset;