185a8bae0f2ce46c65ec6a541c2fe7299df6d7f4 - gcc

commit	185a8bae0f2ce46c65ec6a541c2fe7299df6d7f4	[log] [tgz]
author	Richard Biener <rguenther@suse.de>	Wed Jul 16 15:07:58 2025 +0200
committer	Richard Biener <rguenther@suse.de>	Fri Jul 18 10:39:43 2025 +0200
tree	1a6314cb70314d223335c26f9feb0a5d3c51dcc8
parent	aa28a331e9f7c526540184d4b748198b8e5ad338 [diff]

tree-optimization/121049 - avoid loop masking with even/odd reduction

The following disables loop masking when we are using an even/odd
widening operation in a reduction because the loop mask then aligns
to the wrong elements.

	PR tree-optimization/121049
	* internal-fn.h (widening_evenodd_fn_p): Declare.
	* internal-fn.cc (widening_evenodd_fn_p): New function.
	* tree-vect-stmts.cc (vectorizable_conversion): When using
	an even/odd widening function disable loop masking.

	* gcc.dg/vect/pr121049.c: New testcase.

(cherry picked from commit bc5570f7ef796fa7f5ab89b34ed9de2be5299f0e)

gcc/internal-fn.cc[diff]
gcc/internal-fn.h[diff]
gcc/testsuite/gcc.dg/vect/pr121049.c[Added - diff]
gcc/tree-vect-stmts.cc[diff]

4 files changed

tree: 1a6314cb70314d223335c26f9feb0a5d3c51dcc8