The purpose of this set of changes is to remove assumptions in GCC
about type sizes. Previous to this patch, GCC assumed that all types
were powers-of-two in size, and used naive math accordingly.
Old:
POINTER_SIZE / BITS_PER_UNIT
TYPE_SIZE
GET_MODE_BITSIZE
New:
POINTER_SIZE_UNITS (ceil, not floor)
TYPE_PRECISION
GET_MODE_PRECISION
gcc/
* cppbuiltin.c (define_builtin_macros_for_type_sizes): Round
pointer size up to a power of two.
* defaults.h (DWARF2_ADDR_SIZE): Round up.
(POINTER_SIZE_UNITS): New, rounded up value.
* dwarf2asm.c (size_of_encoded_value): Use it.
(dw2_output_indirect_constant_1): Likewise.
* expmed.c (init_expmed_one_conv): We now know the sizes of
partial int modes.
* loop-iv.c (iv_number_of_iterations): Use precision, not size.
* optabs.c (expand_float): Use precision, not size.
(expand_fix): Likewise.
* simplify-rtx (simplify_unary_operation_1): Likewise.
* tree-dfa.c (get_ref_base_and_extent): Likewise.
* varasm.c (assemble_addr_to_section): Round up pointer sizes.
(default_assemble_integer) Likewise.
(dump_tm_clone_pairs): Likewise.
* dwarf2out.c (mem_loc_descriptor): Allow partial-int modes also.
* var-tracking.c (adjust_mems): Allow partial-int modes also.
(prepare_call_arguments): Likewise.
* stor-layout.c (finalize_type_size): Preserve precision.
(layout_type): Use precision, not size.