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tree-optimization/122292 - fix reduction code gen issue 

The following fixes a mixup of vector types checked when looking
at a conditional reduction operation.  We want the actual data
vector input type, so look at the SLP trees type instead and
special-case lane-reducing ops like the original code did.

	PR tree-optimization/122292
	* tree-vect-loop.cc (vect_transform_reduction): Compute the
	input vector type the same way the analysis phase does.
This commit is contained in:
Richard Biener 2025-10-15 16:15:50 +02:00 committed by Richard Biener
parent b9c253795e
commit 6d9d969ab4
1 changed files with 3 additions and 1 deletions
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gcc/tree-vect-loop.cc
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@ -7752,7 +7752,9 @@ vect_transform_reduction (loop_vec_info loop_vinfo,
assumption is not true: we use reduc_index to record the index of the
reduction variable. */
int reduc_index = SLP_TREE_REDUC_IDX (slp_node);
tree vectype_in = SLP_TREE_VECTYPE (SLP_TREE_CHILDREN (slp_node)[0]);
tree vectype_in = SLP_TREE_VECTYPE (slp_node);
if (lane_reducing_op_p (op.code))
vectype_in = SLP_TREE_VECTYPE (SLP_TREE_CHILDREN (slp_node)[0]);
vec_num = vect_get_num_copies (loop_vinfo, SLP_TREE_CHILDREN (slp_node)[0]);