148909bc70
This patch adds a bitmap_view<X> class that creates a read-only, on-stack bitmap representation of an array-like object X. The main use case is to allow HARD_REG_SETs to be used in REG_SET (i.e. bitmap) operations. For now it only handles constant-sized arrays, but I've tried to define the types in a way that could handle variable-sized arrays in future (although less efficiently). E.g. this might be useful for combining bitmaps and sbitmaps. For the read-only view to work as intended, I needed to make bitmap_bit_p take a const_bitmap instead of a bitmap. Logically the bitmap really is read-only, but we update the "current" and "indx" fields of the bitmap_head after doing a search. 2019-09-09 Richard Sandiford <richard.sandiford@arm.com> gcc/ * array-traits.h: New file. * coretypes.h (array_traits, bitmap_view): New types. * bitmap.h: Include "array-traits.h" (bitmap_bit_p): Take a const_bitmap instead of a bitmap. (base_bitmap_view, bitmap_view): New classes. * bitmap.c (bitmap_bit_p): Take a const_bitmap instead of a bitmap. * hard-reg-set.h: Include array-traits.h. (array_traits<HARD_REG_SET>): New struct. * regset.h (IOR_REG_SET_HRS): New macro. * loop-iv.c (simplify_using_initial_values): Use IOR_REG_SET_HRS rather than iterating over each hard register. * sched-deps.c (sched_analyze_insn): Likewise. * sel-sched-ir.c (setup_id_implicit_regs): Likewise. From-SVN: r275536 |
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