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The following handles detecting of a reduction chain wrapped in a conversion. This does not yet try to combine operands with different signedness, but we should now handle signed integer accumulation to both a signed and unsigned accumulator fine. PR tree-optimization/122364 * tree-vect-slp.cc (vect_analyze_slp_reduc_chain): Re-try linearization on a conversion source. * gcc.dg/vect/vect-reduc-chain-5.c: New testcase.
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