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[PATCH, AArch64] Implement ctz and clrsb standard patterns

From: "Ian Bolton" <ian dot bolton at arm dot com>
To: <gcc-patches at gcc dot gnu dot org>
Date: Tue, 18 Sep 2012 10:18:10 +0100
Subject: [PATCH, AArch64] Implement ctz and clrsb standard patterns

I've implemented the following standard patterns:

* clrsb
* ctz

Regression runs passed and I have added compilation tests for them,
and clz as well.   (Execution tests are covered by
gcc/testsuite/gcc.c-torture/execute/builtin-bitops-1.c.)

OK for aarch64-branch and aarch64-4.7-branch?

Cheers,
Ian


2012-09-18  Ian Bolton  <ian.bolton@arm.com>

gcc/
	* config/aarch64/aarch64.h: Define CTZ_DEFINED_VALUE_AT_ZERO.
	* config/aarch64/aarch64.md (clrsb<mode>2): New pattern.
	* config/aarch64/aarch64.md (rbit<mode>2): New pattern.
	* config/aarch64/aarch64.md (ctz<mode>2): New pattern.

gcc/testsuite/
	* gcc.target/aarch64/clrsb.c: New test.
	* gcc.target/aarch64/clz.c: New test.
	* gcc.target/aarch64/ctz.c: New test.

Attachment: aarch64-clrsb-clz-ctz-v1.txt
Description: Text document

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