[PATCH] tree-optimization/106365 - DSE of LEN_STORE and MASK_STORE

Jeff Law jeffreyalaw@gmail.com
Sun Jul 31 02:45:54 GMT 2022

On 7/21/2022 3:05 AM, Richard Biener via Gcc-patches wrote:
> The following enhances DSE to handle LEN_STORE (optimally) and
> MASK_STORE (conservatively).
> Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
> Kewen is testing on powerpc.  Handling MASK_STORE_LANES in
> a similar way to MASK_STORE is probably possible but I couldn't
> figure a way to generate one for testing.  STORE_LANES is
> probably handled already since it's ECF_CONST.
> 	PR tree-optimization/106365
> 	* tree-ssa-dse.cc (initialize_ao_ref_for_dse): Handle
> 	LEN_STORE, add mode to initialize a may-def and handle
> 	MASK_STORE that way.
> 	(dse_optimize_stmt): Query may-defs.  Handle internal
> 	functions LEN_STORE and MASK_STORE similar to how
> 	we handle memory builtins but without byte tracking.
LGTM.  Obviously if you can massage the PR into a testcase, it's even 
better :-)


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