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rgbsse: Clamp intermediate values to u8. (nw)

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Ted Green 2017-10-10 07:12:27 -06:00
parent 1b9278eff0
commit 1175023e95
1 changed files with 4 additions and 1 deletions
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5
src/emu/video/rgbsse.h
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@ -330,7 +330,10 @@ public:
m_value = _mm_slli_epi16(m_value, 4);
// Do the 16 bit multiply, bottom 64 bits will contain 16 bit truncated results
m_value = _mm_mulhi_epi16(m_value, tmp1);
// Unpack into 32 bit values
// Clamp to u8
m_value = _mm_packus_epi16(m_value, _mm_setzero_si128());
// Unpack up to s32
m_value = _mm_unpacklo_epi8(m_value, _mm_setzero_si128());
m_value = _mm_unpacklo_epi16(m_value, _mm_setzero_si128());
add(other);
clamp_to_uint8();