855b61b61e
pr110625_[24].c started failing after r15-1329-gd66b820f392aa9a7,
which switched to single def-use cycles for single-lane SLP.
The problem is that we only costed one vector accumulator
operation for an N-vector cycle.
The problem seems to have been latent, and meant that we also
only costed one FADDA for reduc_strict_4.c and reduc_strict_5.c,
even though they need 4 and 6 FADDAs respectively.
I'm not sure why:
if ((double_reduc || reduction_type != TREE_CODE_REDUCTION)
&& ncopies > 1)
was previously only necessary for non-SLP, but the patch preserves
that for safety.
gcc/
PR tree-optimization/116901
* tree-vect-loop.cc (vectorizable_reduction): Set ncopies to
SLP_TREE_NUMBER_OF_VEC_STMTS for SLP.
gcc/testsuite/
PR tree-optimization/116901
* gcc.target/aarch64/sve/reduc_strict_4.c: Turn off costing.
* gcc.target/aarch64/sve/reduc_strict_5.c: Likewise.
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