1 files changed, 81 insertions, 0 deletions
diff --git a/vendor/cpufeatures/src/x86.rs b/vendor/cpufeatures/src/x86.rs
new file mode 100644
index 000000000..37e20ef6a
--- /dev/null
+++ b/vendor/cpufeatures/src/x86.rs
@@ -0,0 +1,81 @@
+//! x86/x86-64 CPU feature detection support.
+//!
+//! Portable, `no_std`-friendly implementation that relies on the x86 `CPUID`
+//! instruction for feature detection.
+
+// Evaluate the given `$body` expression any of the supplied target features
+// are not enabled. Otherwise returns true.
+//
+// The `$body` expression is not evaluated on SGX targets, and returns false
+// on these targets unless *all* supplied target features are enabled.
+#[macro_export]
+#[doc(hidden)]
+macro_rules! __unless_target_features {
+    ($($tf:tt),+ => $body:expr ) => {{
+        #[cfg(not(all($(target_feature=$tf,)*)))]
+        {
+            #[cfg(not(target_env = "sgx"))]
+            $body
+
+            // CPUID is not available on SGX targets
+            #[cfg(target_env = "sgx")]
+            false
+        }
+
+        #[cfg(all($(target_feature=$tf,)*))]
+        true
+    }};
+}
+
+// Use CPUID to detect the presence of all supplied target features.
+#[macro_export]
+#[doc(hidden)]
+macro_rules! __detect_target_features {
+    ($($tf:tt),+) => {{
+        #[cfg(target_arch = "x86")]
+        use core::arch::x86::{__cpuid, __cpuid_count};
+        #[cfg(target_arch = "x86_64")]
+        use core::arch::x86_64::{__cpuid, __cpuid_count};
+
+        let cr = unsafe {
+            [__cpuid(1), __cpuid_count(7, 0)]
+        };
+
+        $($crate::check!(cr, $tf) & )+ true
+    }};
+}
+
+macro_rules! __expand_check_macro {
+    ($(($name:tt, $i:expr, $reg:ident, $offset:expr)),* $(,)?) => {
+        #[macro_export]
+        #[doc(hidden)]
+        macro_rules! check {
+            $(
+                ($cr:expr, $name) => { ($cr[$i].$reg & (1 << $offset) != 0) };
+            )*
+        }
+    };
+}
+
+__expand_check_macro! {
+    ("mmx", 0, edx, 23),
+    ("sse", 0, edx, 25),
+    ("sse2", 0, edx, 26),
+    ("sse3", 0, ecx, 0),
+    ("pclmulqdq", 0, ecx, 1),
+    ("ssse3", 0, ecx, 9),
+    ("fma", 0, ecx, 12),
+    ("sse4.1", 0, ecx, 19),
+    ("sse4.2", 0, ecx, 20),
+    ("popcnt", 0, ecx, 23),
+    ("aes", 0, ecx, 25),
+    ("avx", 0, ecx, 28),
+    ("rdrand", 0, ecx, 30),
+    ("sgx", 1, ebx, 2),
+    ("bmi1", 1, ebx, 3),
+    ("avx2", 1, ebx, 5),
+    ("bmi2", 1, ebx, 8),
+    ("rdseed", 1, ebx, 18),
+    ("adx", 1, ebx, 19),
+    ("sha", 1, ebx, 29),
+}