40d643d8de
This patch implements the costing function determine_suggested_unroll_factor for aarch64. It determines the unrolling factor by dividing the number of X operations we can do per cycle by the number of X operations, taking this information from the vec_ops analysis during vector costing and the available issue_info information. We multiply the dividend by a potential reduction_latency, to improve our pipeline utilization if we are stalled waiting on a particular reduction operation. gcc/ChangeLog: * config/aarch64/aarch64.cc (aarch64_vector_costs): Define determine_suggested_unroll_factor and m_has_avg. (determine_suggested_unroll_factor): New function. (aarch64_vector_costs::add_stmt_cost): Check for a qualifying pattern to set m_nosve_pattern. (aarch64_vector_costs::finish_costs): Use determine_suggested_unroll_factor. * config/aarch64/aarch64.opt (aarch64-vect-unroll-limit): New. * doc/invoke.texi: (aarch64-vect-unroll-limit): Document new option. |
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| c++tools | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
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