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qemu/host_utils: Provide MSVC compatible equivalents of clz32/64 and ctz32/64

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Lioncash 2019-01-30 13:19:03 -05:00
parent 17ff842261
commit 205035a267
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1 changed files with 53 additions and 0 deletions
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53
qemu/include/qemu/host-utils.h
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@ -109,6 +109,18 @@ static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
}
#endif
#ifdef _MSC_VER
static inline int clz32(uint32_t val)
{
unsigned long leading_zero = 0;
if (_BitScanReverse(&leading_zero, val) != 0) {
return 31 - (int)leading_zero;
}
return 32;
}
#else
/**
* clz32 - count leading zeros in a 32-bit value.
* @val: The value to search
@ -120,6 +132,7 @@ static inline int clz32(uint32_t val)
{
return val ? __builtin_clz(val) : 32;
}
#endif /* _MSC_VER */
/**
* clo32 - count leading ones in a 32-bit value.
@ -132,6 +145,18 @@ static inline int clo32(uint32_t val)
return clz32(~val);
}
#ifdef _MSC_VER
static inline int clz64(uint64_t val)
{
unsigned long trailing_zero = 0;
if (_BitScanReverse64(&trailing_zero, val) != 0) {
return 63 - (int)trailing_zero;
}
return 64;
}
#else
/**
* clz64 - count leading zeros in a 64-bit value.
* @val: The value to search
@ -143,6 +168,7 @@ static inline int clz64(uint64_t val)
{
return val ? __builtin_clzll(val) : 64;
}
#endif /* _MSC_VER */
/**
* clo64 - count leading ones in a 64-bit value.
@ -155,6 +181,19 @@ static inline int clo64(uint64_t val)
return clz64(~val);
}
#ifdef _MSC_VER
static inline int ctz32(uint32_t val)
{
unsigned long trailing_zero = 0;
if (_BitScanForward(&trailing_zero, val) != 0) {
return (int)trailing_zero;
}
return 32;
}
#else
/**
* ctz32 - count trailing zeros in a 32-bit value.
* @val: The value to search
@ -166,6 +205,7 @@ static inline int ctz32(uint32_t val)
{
return val ? __builtin_ctz(val) : 32;
}
#endif /* _MSC_VER */
/**
* cto32 - count trailing ones in a 32-bit value.
@ -178,6 +218,18 @@ static inline int cto32(uint32_t val)
return ctz32(~val);
}
#ifdef _MSC_VER
static inline int ctz64(uint64_t val)
{
unsigned long trailing_zero = 0;
if (_BitScanForward64(&trailing_zero, val) != 0) {
return (int)trailing_zero;
}
return 64;
}
#else
/**
* ctz64 - count trailing zeros in a 64-bit value.
* @val: The value to search
@ -189,6 +241,7 @@ static inline int ctz64(uint64_t val)
{
return val ? __builtin_ctzll(val) : 64;
}
#endif /* _MSC_VER */
/**
* cto64 - count trailing ones in a 64-bit value.