forked from 0ad/0ad
50 lines
725 B
C++
50 lines
725 B
C++
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#include "ia32.h"
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#include "types.h"
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#include "misc.h"
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#ifndef _M_IX86
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#error "#define _M_IX86 to enable IA-32 code"
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#endif
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inline u64 rdtsc()
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{
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u64 c;
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__asm
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{
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cpuid
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rdtsc
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mov dword ptr [c], eax
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mov dword ptr [c+4], edx
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}
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// 64 bit values are returned in edx:eax, but we do it the safe way
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return c;
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}
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// change FPU control word (used to set precision)
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uint _control87(uint new_cw, uint mask)
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{
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__asm
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{
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push eax
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fnstcw [esp]
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pop eax ; old_cw
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mov ecx, [new_cw]
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mov edx, [mask]
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and ecx, edx ; new_cw & mask
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not edx ; ~mask
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and eax, edx ; old_cw & ~mask
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or eax, ecx ; (old_cw & ~mask) | (new_cw & mask)
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push eax
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fldcw [esp]
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pop eax
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}
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UNUSED(new_cw)
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UNUSED(mask)
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return 0;
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}
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