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v60: implement correct rounding mode when converting float to integer (#13506)

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Matthew Daniels 2025-03-21 16:40:22 +00:00 committed by GitHub
parent 760ae70305
commit 53f391ff5e
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1 changed files with 7 additions and 1 deletions
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8
src/devices/cpu/v60/op2.hxx
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@ -71,7 +71,13 @@ uint32_t v60_device::opCVTSW()
// Convert to uint32_t // Convert to uint32_t
val = u2f(m_op1); val = u2f(m_op1);
m_modwritevalw = (uint32_t)(int64_t)val; switch (TKCW & 7)
{
case 0: m_modwritevalw = (uint32_t)(int64_t)round(val); break;
case 1: m_modwritevalw = (uint32_t)(int64_t)floor(val); break;
case 2: m_modwritevalw = (uint32_t)(int64_t)ceil(val); break;
default: m_modwritevalw = (uint32_t)(int64_t)trunc(val); break;
}
_S = ((m_modwritevalw & 0x80000000) != 0); _S = ((m_modwritevalw & 0x80000000) != 0);
_OV = (_S && val >= 0.0f) || (!_S && val <= -1.0f); _OV = (_S && val >= 0.0f) || (!_S && val <= -1.0f);