added clflush after explicit_bzero on x86 nightly builds

Cargo.toml

@@ -17,3 +17,6 @@ base64 = "0.13"
 getrandom = "0.2"
 openssl = "0.10"
 smallvec = {version = "1.6", features=["union"], optional = true}
+
+[build-dependencies]
+rustc_version = "0.2"

build.rs

@@ -0,0 +1,24 @@
+
+extern crate rustc_version;
+use rustc_version::{version, version_meta, Channel};
+
+fn main() {
+    // Assert we haven't travelled back in time
+    assert!(version().unwrap().major >= 1);
+
+    // Set cfg flags depending on release channel
+    match version_meta().unwrap().channel {
+        Channel::Stable => {
+            println!("cargo:rustc-cfg=stable");
+        }
+        Channel::Beta => {
+            println!("cargo:rustc-cfg=beta");
+        }
+        Channel::Nightly => {
+            println!("cargo:rustc-cfg=nightly");
+        }
+        Channel::Dev => {
+            println!("cargo:rustc-cfg=dev");
+        }
+    }
+}

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(nightly, feature(asm))] 
+
 #![allow(dead_code)]
 
 //extern crate test;

src/stream.rs

@@ -128,6 +128,14 @@ where W: Write
 	    }
 	    unsafe {
 		explicit_bzero(self.buffer.as_mut_ptr() as *mut c_void, self.buffer.len());
+
+		#[cfg(nightly)] 
+		if cfg!(target_arch = "x86_64") || cfg!(target_arch = "x86"){
+		    asm!(
+			"clflush [{}]",
+			in(reg) self.buffer.as_mut_ptr()
+		    );
+		}
 	    }
 	    return;
 	}