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Improved compile time checking to make runtime check consitent with lack of availability

pull/174/head
Jeffrey Walton 2016-05-06 05:20:56 -04:00
parent fe4019b942
commit f86aca7258
1 changed files with 11 additions and 4 deletions
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15
cpu.cpp
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@ -269,16 +269,23 @@ void __attribute__ ((constructor)) DetectArmFeatures()
void DetectArmFeatures()
#endif
{
#if defined(__linux__) && defined(__aarch64__)
#if defined(__linux__) && defined(__aarch64__) // ARM-64
const unsigned long hwcaps = getauxval(AT_HWCAP);
g_hasNEON = !!(hwcaps & HWCAP_ASIMD);
# if defined(__ARM_FEATURE_CRC32)
g_hasCRC32 = !!(hwcaps & HWCAP_CRC32);
#elif defined(__linux__)
# else
g_hasCRC32 = false;
# endif
#elif defined(__linux__) // ARM-32
const unsigned long hwcaps = getauxval(AT_HWCAP);
g_hasNEON = !!(hwcaps & HWCAP_ARM_NEON);
// g_hasCRC32 = !!(hwcaps & HWCAP_ARM_CRC32);
# if defined(__ARM_FEATURE_CRC32)
g_hasCRC32 = !!(hwcaps & HWCAP_ARM_CRC32);
# else
g_hasCRC32 = false;
#elif defined(_WIN32) && defined(_M_ARM)
# endif
#elif defined(_WIN32) && defined(_M_ARM) // Microsoft ARM
g_hasNEON = true;
g_hasCRC32 = false;
#endif