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[PATCH, AArch64] Use GCC builtins to count leading/tailing zeros

From: Yufeng Zhang <Yufeng dot Zhang at arm dot com>
To: libc-alpha at sourceware dot org
Cc: Richard Earnshaw <Richard dot Earnshaw at arm dot com>, Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>
Date: Tue, 07 Jan 2014 15:25:36 +0000
Subject: [PATCH, AArch64] Use GCC builtins to count leading/tailing zeros
Authentication-results: sourceware.org; auth=none

Hi,

This patch defines a number of macros in stdlib/longlong.h to use GCCbuiltins __builtin_clz* to implement the __clz* and __ctz* functions.


OK for the mainline?

Thanks,
Yufeng


	* stdlib/longlong.h (count_leading_zeros, count_trailing_zeros)
	(COUNT_LEADING_ZEROS_0): Define for aarch64.

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