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fallback to the naive version for CE6

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This commit is contained in:
escherstair 2020-08-04 14:38:45 +02:00
parent 6364c8e5ab
commit 91940e84b1
1 changed files with 1 additions and 22 deletions
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23
include/rapidjson/internal/clzll.h
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@ -34,31 +34,10 @@ inline uint32_t clzll(uint64_t x) {
// infinite loop in the software implementation. // infinite loop in the software implementation.
RAPIDJSON_ASSERT(x != 0); RAPIDJSON_ASSERT(x != 0);
#if defined(_MSC_VER) #if defined(_MSC_VER) && !defined(UNDER_CE)
unsigned long r = 0; unsigned long r = 0;
#if defined(_WIN64) #if defined(_WIN64)
_BitScanReverse64(&r, x); _BitScanReverse64(&r, x);
#elif defined(UNDER_CE)
// Scan the high 32 bits.
uint32_t high = static_cast<uint32_t>(x >> 32);
if (high != 0)
{
unsigned long index = 31;
while((high & (1U<<index)) == 0)
{
--index;
}
return index;
}
// Scan the low 32 bits.
uint32_t low =static_cast<uint32_t>(x & 0xFFFFFFFF);
unsigned long index = 31;
while((low & (1U<<index)) == 0)
{
--index;
}
return index;
#else #else
// Scan the high 32 bits. // Scan the high 32 bits.
if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32))) if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32)))