diff options
Diffstat (limited to 'src/build_cpuid.cpp')
| -rw-r--r-- | src/build_cpuid.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/build_cpuid.cpp b/src/build_cpuid.cpp new file mode 100644 index 000000000..b7ba5dcdf --- /dev/null +++ b/src/build_cpuid.cpp @@ -0,0 +1,35 @@ +#if !defined(GB_COMPILER_MSVC) + #if defined(GB_CPU_X86) + #include <cpuid.h> + #endif +#endif + +gb_internal void odin_cpuid(int leaf, int result[]) { + #if defined(GB_CPU_ARM) || defined(GB_CPU_RISCV) + return; + + #elif defined(GB_CPU_X86) + + #if defined(GB_COMPILER_MSVC) + __cpuid(result, leaf); + #else + __get_cpuid(leaf, (unsigned int*)&result[0], (unsigned int*)&result[1], (unsigned int*)&result[2], (unsigned int*)&result[3]); + #endif + + #endif +} + +gb_internal bool should_use_march_native() { + #if !defined(GB_CPU_X86) + return false; + + #else + + int cpu[4]; + odin_cpuid(0x1, &cpu[0]); // Get feature information in ECX + EDX + + bool have_popcnt = cpu[2] & (1 << 23); // bit 23 in ECX = popcnt + return !have_popcnt; + + #endif +}
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