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Fix some issues with CPUID.

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This commit is contained in:
David Reid
2018-07-25 18:32:13 +10:00
parent 9a94970bca
commit 049f46738b
1 changed files with 17 additions and 3 deletions
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mini_al.h
+17 -3
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@@ -2724,9 +2724,23 @@ mal_uint64 mal_sine_wave_read(mal_sine_wave* pSignWave, mal_uint64 count, float*
#elif (defined(__GNUC__) || defined(__clang__)) && !defined(MAL_ANDROID)
static MAL_INLINE void mal_cpuid(int info[4], int fid)
{
__asm__ __volatile__ (
"cpuid" : "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3]) : "a"(fid), "c"(0)
);
// It looks like the -fPIC option uses the ebx register which GCC complains about. We can work around this by just using a different register, the
// specific register of which I'm letting the compiler decide on. The "k" prefix is used to specify a 32-bit register. The {...} syntax is for
// supporting different assembly dialects.
//
// What's basically happening is that we're saving and restoring the ebx register manually.
#if defined(DRFLAC_X86) && defined(__PIC__)
__asm__ __volatile__ (
"xchg{l} {%%}ebx, %k1;"
"cpuid;"
"xchg{l} {%%}ebx, %k1;"
: "=a"(info[0]), "=&r"(info[1]), "=c"(info[2]), "=d"(info[3]) : "a"(fid), "c"(0)
);
#else
__asm__ __volatile__ (
"cpuid" : "=a"(info[0]), "=b"(info[1]), "=c"(info[2]), "=d"(info[3]) : "a"(fid), "c"(0)
);
#endif
}
static MAL_INLINE unsigned long long mal_xgetbv(int reg)