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- cleaned x86 CPU detection of obsolete code

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This commit is contained in:
alexey.lysiuk 2021-02-06 13:42:49 +02:00
parent a7e97daa86
commit d9a5c00cd4
2 changed files with 0 additions and 46 deletions
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45
src/common/utility/x86.cpp
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@ -81,50 +81,6 @@ void CheckCPUID(CPUInfo *cpu)
cpu->DataL1LineSize = 32; // Assume a 32-byte cache line cpu->DataL1LineSize = 32; // Assume a 32-byte cache line
#if !defined(_M_IX86) && !defined(__i386__) && !defined(_M_X64) && !defined(__amd64__)
return;
#else
#if defined(_M_IX86) || defined(__i386__)
// Old 486s do not have CPUID, so we must test for its presence.
// This code is adapted from the samples in AMD's document
// entitled "AMD-K6 MMX Processor Multimedia Extensions."
#ifndef __GNUC__
__asm
{
pushfd // save EFLAGS
pop eax // store EFLAGS in EAX
mov ecx,eax // save in ECX for later testing
xor eax,0x00200000 // toggle bit 21
push eax // put to stack
popfd // save changed EAX to EFLAGS
pushfd // push EFLAGS to TOS
pop eax // store EFLAGS in EAX
cmp eax,ecx // see if bit 21 has changed
jne haveid // if no change, then no CPUID
}
return;
haveid:
#else
int oldfd, newfd;
__asm__ __volatile__("\t"
"pushf\n\t"
"popl %0\n\t"
"movl %0,%1\n\t"
"xorl $0x200000,%0\n\t"
"pushl %0\n\t"
"popf\n\t"
"pushf\n\t"
"popl %0\n\t"
: "=r" (newfd), "=r" (oldfd));
if (oldfd == newfd)
{
return;
}
#endif
#endif
// Get vendor ID // Get vendor ID
__cpuid(foo, 0); __cpuid(foo, 0);
cpu->dwVendorID[0] = foo[1]; cpu->dwVendorID[0] = foo[1];
@ -198,7 +154,6 @@ haveid:
cpu->FeatureFlags[3] = foo[3]; // AMD feature flags cpu->FeatureFlags[3] = foo[3]; // AMD feature flags
} }
} }
#endif
} }
FString DumpCPUInfo(const CPUInfo *cpu) FString DumpCPUInfo(const CPUInfo *cpu)

1
src/common/utility/x86.h
View file

@ -128,7 +128,6 @@ struct CPUInfo // 92 bytes
extern CPUInfo CPU; extern CPUInfo CPU;
struct PalEntry;
void CheckCPUID (CPUInfo *cpu); void CheckCPUID (CPUInfo *cpu);
FString DumpCPUInfo (const CPUInfo *cpu); FString DumpCPUInfo (const CPUInfo *cpu);