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4b9c23ea4e
This patch speeds up the ifcvt_memrefs_wont_trap computation by caching the results of the computations in the data references ->aux fields. * tree-if-conv.c (struct ifc_dr): New. (IFC_DR): New. (DR_WRITTEN_AT_LEAST_ONCE): New. (DR_RW_UNCONDITIONALLY): New. (memref_read_or_written_unconditionally): Use the cached values when possible. (write_memref_written_at_least_once): Same. (if_convertible_loop_p): Initialize and free DR->aux fields. From-SVN: r163532
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