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Improve constant folding for sign extension

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Violet 2025-09-23 18:16:03 +00:00
commit da9c0e77d9
2 changed files with 14 additions and 1 deletions
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ptx/lib/zluda_ptx_impl.bc
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ptx/lib/zluda_ptx_impl.cpp
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@ -812,6 +812,14 @@ typedef uint32_t ShflSyncResult __attribute__((ext_vector_type(2)));
{
uint8_t sel = static_cast<uint8_t>(s >> (i * 4));
uint8_t addr = sel & 0x7;
if (sel & 0x8)
{
if (addr % 2 == 1)
{
v_perm_selector.u8x4[i] = 0x8 + addr / 2;
continue;
}
}
v_perm_selector.u8x4[i] = addr;
}
@ -821,9 +829,14 @@ typedef uint32_t ShflSyncResult __attribute__((ext_vector_type(2)));
for (size_t i = 0; i < 4; i++)
{
uint8_t sel = static_cast<uint8_t>(s >> (i * 4));
uint8_t addr = sel & 0x7;
if (sel & 0x8)
{
if (addr % 2 != 1)
{
output.u8x4[i] = (output.u8x4[i] & 0x80) * 0xff;
continue;
}
}
}