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This patch is to refactor the existing peel_iters_prologue and peel_iters_epilogue cost model handlings, by following the structure below suggested by Richard Sandiford: - calculate peel_iters_prologue - calculate peel_iters_epilogue - add costs associated with peel_iters_prologue - add costs associated with peel_iters_epilogue - add costs related to branch taken/not_taken. Bootstrapped/regtested on aarch64-linux-gnu. gcc/ChangeLog: * tree-vect-loop.c (vect_get_known_peeling_cost): Factor out some code to determine peel_iters_epilogue to... (vect_get_peel_iters_epilogue): ...this new function. (vect_estimate_min_profitable_iters): Refactor cost calculation on peel_iters_prologue and peel_iters_epilogue.
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