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d1ff0847b2
Storing one element of a vector is costed as a vec_to_scalar followed by a scalar_store. However, vec_to_scalar is also used for reductions and for vector-to-GPR moves, which makes it difficult to pick one cost for them all. This patch therefore adds a cost for extracting one element of a vector in preparation for storing it out. The store itself is still costed separately. Like with the previous patches, this one only becomes active if a CPU selects use_new_vector_costs. It should therefore have a very low impact on other CPUs. gcc/ * config/aarch64/aarch64-protos.h (simd_vec_cost::store_elt_extra_cost): New member variable. * config/aarch64/aarch64.c (generic_advsimd_vector_cost): Update accordingly, using the vec_to_scalar cost for the new field. (generic_sve_vector_cost, a64fx_advsimd_vector_cost): Likewise. (a64fx_sve_vector_cost, qdf24xx_advsimd_vector_cost): Likewise. (thunderx_advsimd_vector_cost, tsv110_advsimd_vector_cost): Likewise. (cortexa57_advsimd_vector_cost, exynosm1_advsimd_vector_cost) (xgene1_advsimd_vector_cost, thunderx2t99_advsimd_vector_cost) (thunderx3t110_advsimd_vector_cost): Likewise. (aarch64_detect_vector_stmt_subtype): Detect single-element stores.
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