[PATCH] Implement __clzdi2 and __clzsi2 for early ARM architectures that lack the clz instruction

[Joerg Sonnenberger]

================
Comment at: lib/arm/clzdi2.S:38
@@ +37,3 @@
+#else
+	/* Assumption: n != 0 */
+
----------------
Saleem Abdulrasool wrote:
> I dont see how this assumption holds.
It is part of the interface contract:

>  -- Built-in Function: int __builtin_clz (unsigned int x)
>     Returns the number of leading 0-bits in X, starting at the most
>     significant bit position.  If X is 0, the result is undefined.



http://llvm-reviews.chandlerc.com/D2630