Commits on Nov 30, 2016

1. Add new #[target_feature = "..."] attribute. …

   This commit adds a new attribute that instructs the compiler to emit
   target specific code for a single function. For example, the following
   function is permitted to use instructions that are part of SSE 4.2:
   
       #[target_feature = "+sse4.2"]
       fn foo() { ... }
   
   In particular, use of this attribute does not require setting the
   -C target-feature or -C target-cpu options on rustc.
   
   This attribute does not have any protections built into it. For example,
   nothing stops one from calling the above `foo` function on hosts without
   SSE 4.2 support. Doing so may result in a SIGILL.
   
   This commit also expands the target feature whitelist to include lzcnt,
   popcnt and sse4a. Namely, lzcnt and popcnt have their own CPUID bits,
   but were introduced with SSE4.

   

   BurntSushi committed Nov 30, 2016
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