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zig.h: Avoid depending on cpuid.h for zig_x86_cpuid().

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Just use inline assembly instead, which is what that header does. Also make sure
we have a dummy implementation when inline assembly is unavailable.
This commit is contained in:
Alex Rønne Petersen 2024-12-01 18:50:06 +01:00
parent 24b57f4d30
commit 204df19d79
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1 changed files with 12 additions and 4 deletions
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16
lib/zig.h
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@ -79,8 +79,6 @@
#if defined(zig_msvc)
#include <intrin.h>
#elif defined(zig_x86)
#include <cpuid.h>
#endif
#if __STDC_VERSION__ >= 202311L
@ -4058,19 +4056,29 @@ static inline void zig_x86_cpuid(uint32_t leaf_id, uint32_t subid, uint32_t* eax
*ebx = (uint32_t)cpu_info[1];
*ecx = (uint32_t)cpu_info[2];
*edx = (uint32_t)cpu_info[3];
#elif defined(zig_gnuc) || defined(zig_tinyc) || defined(zig_slimcc)
__asm__("cpuid" : "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx) : "a"(leaf_id), "c"(subid));
#else
__cpuid_count(leaf_id, subid, *eax, *ebx, *ecx, *edx);
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
#endif
}
static inline uint32_t zig_x86_get_xcr0(void) {
#if defined(zig_msvc)
return (uint32_t)_xgetbv(0);
#else
#elif defined(zig_gnuc) || defined(zig_tinyc) || defined(zig_slimcc)
uint32_t eax;
uint32_t edx;
__asm__("xgetbv" : "=a"(eax), "=d"(edx) : "c"(0));
return eax;
#else
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
#endif
}