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[util] Use raw tzcnt for BitMask iterator

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Dereferencing an end iterator is UB, so we don't have to care about the 0
case.
This commit is contained in:
Georg Lehmann 2022-08-03 19:40:34 +02:00 committed by Philip Rebohle
parent fc7e934854
commit 8e37949a71
1 changed files with 9 additions and 0 deletions
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9
src/util/util_bit.h
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@ -336,7 +336,16 @@ namespace dxvk::bit {
} }
uint32_t operator * () const { uint32_t operator * () const {
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__BMI__)
uint32_t res;
asm ("tzcnt %1,%0"
: "=r" (res)
: "r" (m_mask)
: "cc");
return res;
#else
return tzcnt(m_mask); return tzcnt(m_mask);
#endif
} }
bool operator == (iterator other) const { return m_mask == other.m_mask; } bool operator == (iterator other) const { return m_mask == other.m_mask; }