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x64CPUDetect: fix AVX2/BMI1/BMI2/HTT detection

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On non-Windows platforms, ECX was not being initialized to 0.
This commit is contained in:
Tillmann Karras 2015-05-14 23:14:34 +02:00
parent 8290fa1e46
commit 7f57e27a65
1 changed files with 25 additions and 44 deletions
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69
Source/Core/Common/x64CPUDetect.cpp
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@ -11,64 +11,45 @@
#ifndef _WIN32
#if defined __FreeBSD__
#ifdef __FreeBSD__
#include <sys/types.h>
#include <machine/cpufunc.h>
#else
static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
unsigned int *ecx, unsigned int *edx)
#endif
static inline void __cpuidex(int info[4], int function_id, int subfunction_id)
{
#if defined _LP64
// Note: EBX is reserved on Mac OS X and in PIC on Linux, so it has to
// restored at the end of the asm block.
__asm__(
"cpuid;"
"movl %%ebx,%1;"
: "=a" (*eax),
"=S" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "a" (*eax)
: "rbx"
);
#ifdef __FreeBSD__
// Despite the name, this is just do_cpuid() with ECX as second input.
cpuid_count((u_int)function_id, (u_int)subfunction_id, (u_int*)info);
#else
info[0] = function_id; // eax
info[2] = subfunction_id; // ecx
__asm__(
"cpuid;"
"movl %%ebx,%1;"
: "=a" (*eax),
"=S" (*ebx),
"=c" (*ecx),
"=d" (*edx)
: "a" (*eax)
: "ebx"
);
"cpuid"
: "=a" (info[0]),
"=b" (info[1]),
"=c" (info[2]),
"=d" (info[3])
: "a" (function_id),
"c" (subfunction_id)
);
#endif
}
#endif /* defined __FreeBSD__ */
static void __cpuid(int info[4], int x)
static inline void __cpuid(int info[4], int function_id)
{
#if defined __FreeBSD__
do_cpuid((unsigned int)x, (unsigned int*)info);
#else
unsigned int eax = x, ebx = 0, ecx = 0, edx = 0;
do_cpuid(&eax, &ebx, &ecx, &edx);
info[0] = eax;
info[1] = ebx;
info[2] = ecx;
info[3] = edx;
#endif
return __cpuidex(info, function_id, 0);
}
#define _XCR_XFEATURE_ENABLED_MASK 0
static unsigned long long _xgetbv(unsigned int index)
static u64 _xgetbv(u32 index)
{
unsigned int eax, edx;
u32 eax, edx;
__asm__ __volatile__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(index));
return ((unsigned long long)edx << 32) | eax;
return ((u64)edx << 32) | eax;
}
#endif
#endif // ifndef _WIN32
CPUInfo cpu_info;
@ -165,7 +146,7 @@ void CPUInfo::Detect()
if (max_std_fn >= 7)
{
__cpuid(cpu_id, 0x00000007);
__cpuidex(cpu_id, 0x00000007, 0x00000000);
// careful; we can't enable AVX2 unless the XSAVE/XGETBV checks above passed
if ((cpu_id[1] >> 5) & 1)
bAVX2 = bAVX;
@ -211,7 +192,7 @@ void CPUInfo::Detect()
// New mechanism for modern Intel CPUs.
if (vendor == VENDOR_INTEL)
{
__cpuid(cpu_id, 0x00000004);
__cpuidex(cpu_id, 0x00000004, 0x00000000);
int cores_x_package = ((cpu_id[0] >> 26) & 0x3F) + 1;
HTT = (cores_x_package < logical_cpu_count);
cores_x_package = ((logical_cpu_count % cores_x_package) == 0) ? cores_x_package : 1;