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replace inline asm for rdtsc with compiler intrinsics.

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This commit is contained in:
Kelvin Sherlock 2019-01-26 16:48:06 -05:00
parent 38e691562c
commit 7e87fc6968
1 changed files with 19 additions and 25 deletions
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44
src/engine_c.c
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@ -755,38 +755,32 @@ void fixed_memory_ptrs_shut() {
g_rom_cards_ptr = NULL;
}
#if defined(_MSC_VER)
#include <intrin.h>
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
#include <x86intrin.h>
#elif defined(__powerpc__) || defined(__ppc__)
#define __rdtsc() __builtin_ppc_mftb()
#else
#warning __rdtsc unavailable.
#define __rdtsc() 0
#endif
#else
#warning __rdtsc unavailable.
#define __rdtsc() 0
#endif
word32 get_itimer() {
#if defined(_WIN32)
LARGE_INTEGER count;
if (QueryPerformanceCounter(&count))
return count.LowPart;
else
return 0;
#elif defined(__i386) && defined(__GNUC__)
/* Here's my bad ia32 asm code to do rdtsc */
/* Linux source uses: */
/* asm volatile("rdtsc" : "=a"(ret) : : "edx"); */
/* asm volatile("rdtsc" : "=%eax"(ret) : : "%edx"); */
/* GCC bug report 2001-03/msg00786.html used: */
/*register word64 dtmp; */
/*asm volatile ("rdtsc" : "=A" (dtmp)); */
/*return (word32)dtmp; */
register word32 ret;
asm volatile ("rdtsc;movl %%eax,%0" : "=r" (ret) : : "%eax","%edx");
return ret;
#elif defined(__POWERPC__) && defined(__GNUC__)
register word32 ret;
asm volatile ("mftb %0" : "=r" (ret));
return ret;
#else
return 0;
#endif
return __rdtsc();
}
void set_halt_act(int val) {