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GSdx 64-Bit: Fix register misinterpretation 

If the C prototype says int, the compiler might leave garbage in the top half
This commit is contained in:
Tellow Krinkle 2020-07-19 19:48:30 -05:00 committed by tellowkrinkle
parent 4bbf0eeb8b
commit 35eac7c82f
1 changed files with 14 additions and 12 deletions
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26
plugins/GSdx/Renderers/SW/GSDrawScanlineCodeGenerator.x64.avx.cpp
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@ -245,7 +245,7 @@ L("step");
if(!m_sel.edge)
{
test(a0, a0);
test(a0.cvt32(), a0.cvt32());
jle("exit", T_NEAR);
@ -298,7 +298,7 @@ void GSDrawScanlineCodeGenerator::Init_AVX()
// int steps = pixels + skip - 4;
lea(a0, ptr[a0 + a1 - 4]);
lea(a0.cvt32(), ptr[a0 + a1 - 4]);
// GSVector4i test = m_test[skip] | m_test[7 + (steps & (steps >> 31))];
@ -306,10 +306,11 @@ void GSDrawScanlineCodeGenerator::Init_AVX()
vmovdqa(_test, ptr[a1 + r10]);
mov(rax, a0);
sar(rax, 63); // GH: 63 to extract the sign of the register
and(rax, a0);
shl(rax, 4); // * sizeof(m_test[0])
mov(eax, a0.cvt32());
sar(eax, 31); // GH: 31 to extract the sign of the register
and(eax, a0.cvt32());
shl(eax, 4); // * sizeof(m_test[0])
cdqe();
vpor(_test, ptr[rax + r10 + 7 * 16]);
}
@ -317,7 +318,7 @@ void GSDrawScanlineCodeGenerator::Init_AVX()
{
mov(ebx, a1.cvt32()); // left
xor(a1.cvt32(), a1.cvt32()); // skip
lea(a0, ptr[a0 - 4]); // steps
lea(a0.cvt32(), ptr[a0 - 4]); // steps
}
// a0 = steps
@ -501,7 +502,7 @@ void GSDrawScanlineCodeGenerator::Step_AVX()
{
// steps -= 4;
sub(a0, 4);
sub(a0.cvt32(), 4);
// fza_offset++;
@ -611,10 +612,11 @@ void GSDrawScanlineCodeGenerator::Step_AVX()
{
// test = m_test[7 + (steps & (steps >> 31))];
mov(rax, a0);
sar(rax, 63); // GH: 63 to extract the sign of the register
and(rax, a0);
shl(rax, 4);
mov(eax, a0.cvt32());
sar(eax, 31); // GH: 31 to extract the sign of the register
and(eax, a0.cvt32());
shl(eax, 4);
cdqe();
vmovdqa(_test, ptr[rax + r10 + 7 * 16]);
}