commit e442d6f4964daec3c9dfeb52101d9f80ff363f27
author Richard Biener <rguenther@suse.de> Sun Jul 27 18:42:25 2025 +0200
committer Richard Biener <rguenther@suse.de> Thu Jul 31 08:26:54 2025 +0200
tree 4d8c37e242d741dcb5048324fdc1b9928767a26e
parent 5e9d3957c6fea548c9c4a8504261e669add9512a

tree-optimization/121256 - properly support SLP in vectorizable recurrence

We failed to build the correct initialization vector.  For VLA
vectors and a non-uniform initialization vector this rejects
vectorization for now.

	PR tree-optimization/121256
	* tree-vect-loop.cc (vectorizable_recurr): Build a correct
	initialization vector for SLP_TREE_LANES > 1.

	* gcc.dg/vect/vect-recurr-pr121256.c: New testcase.
	* gcc.dg/vect/vect-recurr-pr121256-2.c: Likewise.

(cherry picked from commit 26dc9aa285b53551c55d3d660bb6da21d59d7023)