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Fix default values for AVX and AVX512 state depending on OSXSAVE #1233

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Fix default values for AVX and AVX512 state depending on OSXSAVE #1233

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7 changes: 5 additions & 2 deletions include/xsimd/config/xsimd_cpuid.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -197,8 +197,11 @@ namespace xsimd
// https://docs.kernel.org/admin-guide/hw-vuln/gather_data_sampling.html

unsigned sse_state_os_enabled = 1;
unsigned avx_state_os_enabled = 1;
unsigned avx512_state_os_enabled = 1;
// AVX and AVX512 strictly require OSXSAVE to be enabled by the OS.
// If OSXSAVE is disabled (e.g., via bcdedit /set xsavedisable 1),
// AVX state won't be preserved across context switches, so AVX cannot be used.
unsigned avx_state_os_enabled = 0;
unsigned avx512_state_os_enabled = 0;

// OSXSAVE: A value of 1 indicates that the OS has set CR4.OSXSAVE[bit
// 18] to enable XSETBV/XGETBV instructions to access XCR0 and
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