Use uint32_t for all registers

Author: AntoinePrv

include/xsimd/config/xsimd_cpu_features_x86.hpp

@@ -15,6 +15,7 @@
 #include <array>
 #include <cassert>
 #include <cstdint>
+#include <cstring>
 
 #include "../utils/bits.hpp"
 #include "./xsimd_config.hpp"
@@ -27,11 +28,12 @@ namespace xsimd
 {
     namespace detail
     {
-        using cpuid_reg_t = std::array<int, 4>;
+        using x86_reg32_t = std::uint32_t;
+
+        using cpuid_reg_t = std::array<x86_reg32_t, 4>;
         inline cpuid_reg_t get_cpuid(int level, int count = 0) noexcept;
 
-        using xcr0_reg_t = std::uint32_t;
-        inline xcr0_reg_t get_xcr0_low() noexcept;
+        inline x86_reg32_t get_xcr0_low() noexcept;
     }
 
     /**
@@ -154,8 +156,8 @@ namespace xsimd
          */
         constexpr static x86_xcr0 safe_default() noexcept
         {
-            reg_t low = {};
-            low = utils::make_bit_mask(static_cast<reg_t>(bit::sse));
+            x86_reg32_t low = {};
+            low = utils::make_bit_mask(static_cast<x86_reg32_t>(bit::sse));
             return x86_xcr0(low);
         }
 
@@ -194,9 +196,9 @@ namespace xsimd
         }
 
     private:
-        using reg_t = detail::xcr0_reg_t;
+        using x86_reg32_t = detail::x86_reg32_t;
 
-        enum class bit : reg_t
+        enum class bit
         {
             /** x87 FPU/MMX support (must be 1). */
             x87 = 0,
@@ -221,17 +223,17 @@ namespace xsimd
         };
 
         template <bit... Bits>
-        static constexpr bool all_bits_set(reg_t value) noexcept
+        static constexpr bool all_bits_set(x86_reg32_t value) noexcept
         {
-            return utils::all_bits_set<static_cast<reg_t>(Bits)...>(value);
+            return utils::all_bits_set<static_cast<x86_reg32_t>(Bits)...>(value);
         }
 
         /** Parse a XCR0 value into individual components. */
-        constexpr explicit x86_xcr0(reg_t low) noexcept
+        constexpr explicit x86_xcr0(x86_reg32_t low) noexcept
             : m_low(low)
         {
         }
-        reg_t m_low = {};
+        x86_reg32_t m_low = {};
     };
 
     namespace detail
@@ -242,10 +244,14 @@ namespace xsimd
         {
             cpuid_reg_t reg = {};
 #if defined(_MSC_VER)
-            __cpuidex(reg.data(), leaf, subleaf);
+            int buf[4];
+            __cpuidex(buf, leaf, subleaf);
+            std::memcpy(reg.data(), buf, sizeof(buf));
 
 #elif defined(__INTEL_COMPILER)
-            __cpuid(reg.data(), leaf);
+            int buf[4];
+            __cpuid(buf, leaf);
+            std::memcpy(reg.data(), buf, sizeof(buf));
 
 #elif defined(__GNUC__) || defined(__clang__)
 
@@ -299,7 +305,7 @@ namespace xsimd
             return {}; // All bits to zero
         }
 
-        inline xcr0_reg_t get_xcr0_low() noexcept
+        inline x86_reg32_t get_xcr0_low() noexcept
         {
             return {}; // All bits to zero
         }