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35 lines
733 B
C++
35 lines
733 B
C++
#if !defined(GB_COMPILER_MSVC)
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#if defined(GB_CPU_X86)
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#include <cpuid.h>
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#endif
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#endif
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gb_internal void odin_cpuid(int leaf, int result[]) {
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#if defined(GB_CPU_ARM) || defined(GB_CPU_RISCV)
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return;
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#elif defined(GB_CPU_X86)
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#if defined(GB_COMPILER_MSVC)
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__cpuid(result, leaf);
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#else
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__get_cpuid(leaf, (unsigned int*)&result[0], (unsigned int*)&result[1], (unsigned int*)&result[2], (unsigned int*)&result[3]);
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#endif
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#endif
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}
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gb_internal bool should_use_march_native() {
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#if !defined(GB_CPU_X86)
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return false;
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#else
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int cpu[4];
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odin_cpuid(0x1, &cpu[0]); // Get feature information in ECX + EDX
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bool have_popcnt = cpu[2] & (1 << 23); // bit 23 in ECX = popcnt
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return !have_popcnt;
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#endif
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} |