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Re: Add support for vectorising live-out values using SVE LASTB
- From: Jeff Law <law at redhat dot com>
- To: gcc-patches at gcc dot gnu dot org, richard dot sandiford at linaro dot org
- Date: Wed, 13 Dec 2017 09:36:47 -0700
- Subject: Re: Add support for vectorising live-out values using SVE LASTB
- Authentication-results: sourceware.org; auth=none
- References: <87wp2px70o.fsf@linaro.org>
On 11/17/2017 08:24 AM, Richard Sandiford wrote:
> This patch uses the SVE LASTB instruction to optimise cases in which
> a value produced by the final scalar iteration of a vectorised loop is
> live outside the loop. Previously this situation would stop us from
> using a fully-masked loop.
>
> Tested on aarch64-linux-gnu (with and without SVE), x86_64-linux-gnu
> and powerpc64le-linux-gnu. OK to install?
>
> Richard
>
>
> 2017-11-17 Richard Sandiford <richard.sandiford@linaro.org>
> Alan Hayward <alan.hayward@arm.com>
> David Sherwood <david.sherwood@arm.com>
>
> gcc/
> * doc/md.texi (extract_last_@var{m}): Document.
> * optabs.def (extract_last_optab): New optab.
> * internal-fn.def (EXTRACT_LAST): New internal function.
> * internal-fn.c (cond_unary_direct): New macro.
> (expand_cond_unary_optab_fn): Likewise.
> (direct_cond_unary_optab_supported_p): Likewise.
> * tree-vect-loop.c (vectorizable_live_operation): Allow fully-masked
> loops using EXTRACT_LAST.
> * config/aarch64/aarch64-sve.md (aarch64_sve_lastb<mode>): Rename to...
> (extract_last_<mode>): ...this optab.
> (vec_extract<mode><Vel>): Update accordingly.
>
> gcc/testsuite/
> * gcc.target/aarch64/sve_live_1.c: New test.
> * gcc.target/aarch64/sve_live_1_run.c: Likewise.
Like the last patch, I didn't look at the aarch64 bits. The generic
bits are OK.
jeff