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SPU: improve jumptable detection

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This commit is contained in:
Nekotekina 2018-05-04 23:51:35 +03:00
parent cfa9b163fd
commit acfe22e5bc
1 changed files with 49 additions and 7 deletions
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56
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -198,7 +198,7 @@ std::vector<u32> spu_recompiler_base::block(SPUThread& spu, u32 lsa, std::bitset
case spu_itype::STOP: case spu_itype::STOP:
case spu_itype::STOPD: case spu_itype::STOPD:
{ {
if (data == 0 || data == 0x80) if (data == 0 || data == 3)
{ {
// Stop before null data // Stop before null data
blocks[pos / 4] = true; blocks[pos / 4] = true;
@ -267,12 +267,14 @@ std::vector<u32> spu_recompiler_base::block(SPUThread& spu, u32 lsa, std::bitset
std::basic_string<u32> jt_rel; std::basic_string<u32> jt_rel;
const u32 start = pos + 4; const u32 start = pos + 4;
const u32 limit = 0x40000; const u32 limit = 0x40000;
u64 dabs = 0;
u64 drel = 0;
for (u32 i = start; i < limit; i += 4) for (u32 i = start; i < limit; i += 4)
{ {
const u32 target = spu._ref<u32>(i); const u32 target = spu._ref<u32>(i);
if (target % 4) if (target == 0 || target % 4)
{ {
// Address cannot be misaligned: abort // Address cannot be misaligned: abort
break; break;
@ -297,22 +299,62 @@ std::vector<u32> spu_recompiler_base::block(SPUThread& spu, u32 lsa, std::bitset
} }
} }
// Add detected jump table blocks (TODO: avoid adding both) // Choose position after the jt as an anchor and compute the average distance
for (u32 target : jt_abs)
{
dabs += std::abs(static_cast<s32>(target - start - jt_abs.size() * 4));
}
for (u32 target : jt_rel)
{
drel += std::abs(static_cast<s32>(target - start - jt_rel.size() * 4));
}
// Add detected jump table blocks
if (jt_abs.size() >= 3 || jt_rel.size() >= 3) if (jt_abs.size() >= 3 || jt_rel.size() >= 3)
{ {
if (jt_abs.size() == jt_rel.size())
{
if (dabs < drel)
{
jt_rel.clear();
}
if (dabs > drel)
{
jt_abs.clear();
}
}
if (jt_abs.size() >= jt_rel.size()) if (jt_abs.size() >= jt_rel.size())
{ {
for (u32 target : jt_abs) const u32 new_size = (start - lsa) / 4 + 1 + jt_abs.size();
if (result.size() < new_size)
{ {
add_block(target); result.resize(new_size);
}
for (u32 i = 0; i < jt_abs.size(); i++)
{
add_block(jt_abs[i]);
result[(start - lsa) / 4 + 1 + i] = se_storage<u32>::swap(jt_abs[i]);
} }
} }
if (jt_rel.size() >= jt_abs.size()) if (jt_rel.size() >= jt_abs.size())
{ {
for (u32 target : jt_rel) const u32 new_size = (start - lsa) / 4 + 1 + jt_rel.size();
if (result.size() < new_size)
{ {
add_block(target); result.resize(new_size);
}
for (u32 i = 0; i < jt_rel.size(); i++)
{
add_block(jt_rel[i]);
result[(start - lsa) / 4 + 1 + i] = se_storage<u32>::swap(jt_rel[i] - start);
} }
} }
} }