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Cleanup CpuID function (PR #929)

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Jeffrey Walton 2020-02-07 16:00:16 -05:00
parent 18b535fb5a
commit dd67e1eee4
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1 changed files with 20 additions and 24 deletions
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44
cpu.cpp
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@ -144,30 +144,26 @@ extern "C"
extern bool CPU_ProbeSSE2();
#if _MSC_VER >= 1600
inline bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
__cpuidex((int *)output, func, subfunc);
return true;
}
#elif defined(_MSC_VER) && _MSC_VER < 1600 && defined(_M_X64)
inline bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
CPUID64(func, subfunc, output);
return true;
}
#else
// Borland/Embarcadero and Issue 498
// No inline due to Borland/Embarcadero and Issue 498
// cpu.cpp (131): E2211 Inline assembly not allowed in inline and template functions
bool CpuId(word32 func, word32 subfunc, word32 output[4])
{
#if defined(CRYPTOPP_MS_STYLE_INLINE_ASSEMBLY) || defined(__BORLANDC__)
__try
// Visual Studio 2010 and above, all Intels
#if defined(_MSC_VER) && (_MSC_VER >= 1600)
__cpuidex((int *)output, func, subfunc);
return true;
// Visual Studio 2008 and below, 64-bit
#elif defined(_MSC_VER) && defined(_M_X64)
CPUID64(func, subfunc, output);
return true;
// Visual Studio 2008 and below, 32-bit
#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__BORLANDC__)
__try
{
// Borland/Embarcadero and Issue 500
// Local variables for cpuid output
@ -187,14 +183,16 @@ bool CpuId(word32 func, word32 subfunc, word32 output[4])
output[2] = c;
output[3] = d;
}
// GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION
__except (EXCEPTION_EXECUTE_HANDLER)
{
return false;
}
return true;
// Linux, Unix, OS X, Cygwin, MinGW
#else
// longjmp and clobber warnings. Volatile is required.
// http://github.com/weidai11/cryptopp/issues/24 and http://stackoverflow.com/q/7721854
volatile bool result = true;
@ -237,8 +235,6 @@ bool CpuId(word32 func, word32 subfunc, word32 output[4])
#endif
}
#endif
bool CRYPTOPP_SECTION_INIT g_x86DetectionDone = false;
bool CRYPTOPP_SECTION_INIT g_hasSSE2 = false;
bool CRYPTOPP_SECTION_INIT g_hasSSSE3 = false;