GCC modified for the FreeChainXenon project
b14af30496
We are running out of the machine_mode(8 bits) in RISC-V backend. Thus we would like to extend the machine_mode bit size from 8 to 16 bits. However, it is sensitive to extend the memory size in common structure like tree or rtx. This patch would like to extend the machine_mode bits to 16 bits by shrinking, like: * Swap the bit size of code and machine code in rtx_def. * Adjust the machine_mode location and spare in tree. The memory impact of this patch for correlated structure looks like below: +-------------------+----------+---------+------+ | struct/bytes | upstream | patched | diff | +-------------------+----------+---------+------+ | rtx_obj_reference | 8 | 12 | +4 | | ext_modified | 2 | 4 | +2 | | ira_allocno | 192 | 184 | -8 | | qty_table_elem | 40 | 40 | 0 | | reg_stat_type | 64 | 64 | 0 | | rtx_def | 40 | 40 | 0 | | table_elt | 80 | 80 | 0 | | tree_decl_common | 112 | 112 | 0 | | tree_type_common | 128 | 128 | 0 | | access_info | 8 | 8 | 0 | +-------------------+----------+---------+------+ The tree and rtx related struct has no memory changes after this patch, and the machine_mode changes to 16 bits already. Signed-off-by: Pan Li <pan2.li@intel.com> Co-authored-by: Ju-Zhe Zhong <juzhe.zhong@rivai.ai> Co-authored-by: Kito Cheng <kito.cheng@sifive.com> Co-Authored-By: Richard Biener <rguenther@suse.de> Co-Authored-By: Richard Sandiford <richard.sandiford@arm.com> gcc/ChangeLog: * combine.cc (struct reg_stat_type): Extend machine_mode to 16 bits. * cse.cc (struct qty_table_elem): Extend machine_mode to 16 bits (struct table_elt): Extend machine_mode to 16 bits. (struct set): Ditto. * genmodes.cc (emit_mode_wider): Extend type from char to short. (emit_mode_complex): Ditto. (emit_mode_inner): Ditto. (emit_class_narrowest_mode): Ditto. * genopinit.cc (main): Extend the machine_mode limit. * ira-int.h (struct ira_allocno): Extend machine_mode to 16 bits and re-ordered the struct fields for padding. * machmode.h (MACHINE_MODE_BITSIZE): New macro. (GET_MODE_2XWIDER_MODE): Extend type from char to short. (get_mode_alignment): Extend type from char to short. * ree.cc (struct ext_modified): Extend machine_mode to 16 bits and removed the ATTRIBUTE_PACKED. * rtl-ssa/accesses.h: Extend machine_mode to 16 bits, narrow * rtl-ssa/internals.inl (rtl_ssa::access_info): Adjust the assignment. m_kind to 2 bits and remove m_spare. * rtl.h (RTX_CODE_BITSIZE): New macro. (struct rtx_def): Swap both the bit size and location between the rtx_code and the machine_mode. (subreg_shape::unique_id): Extend the machine_mode limit. * rtlanal.h: Extend machine_mode to 16 bits. * tree-core.h (struct tree_type_common): Extend machine_mode to 16 bits and re-ordered the struct fields for padding. (struct tree_decl_common): Extend machine_mode to 16 bits. |
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