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5e5f37ed00
On x86, MAX_MEM_FOR_RS_ALIGN_CODE is 35, when the most common
alignment is 2**3 or 2**4, where the max memory required for the
alignment nops is 7 and 15 bytes respectively. So there is some
memory wasted since commit 83d94ae428. It's not a large amount,
especially considering that frag overhead on x86_46 is 144 bytes,
but even so I'd rather not be blamed for increasing gas memory usage.
So to reduce the memory we'd like to take the alignment into
consideration when initialising an rs_align_code frag. The only
difficulty here is start_bundle making an rs_align_code frag with an
alignment of zero initially, then later increasing the alignment. We
change that to use the bundle alignment when setting up the frag. I
think that is sufficient as bundle_align_p2 can't change in the middle
of a start_bundle/finish_bundle sequence.
I haven't modified any targets other than x86 in this patch. Most
won't benefit much due to using fairly small MAX_MEM_FOR_RS_ALIGN_CODE.
* read.c (start_bundle): Create rs_align_code frag with
bundle_align_p2 alignment, then set to zero alignment.
(finish_bundle): Adjust comment.
* frags.c (MAX_MEM_FOR_RS_ALIGN_CODE): Pass p2align and max
to macro.
* config/tc-i386.h (HANDLE_ALIGN): Assert that max_bytes is
sufficient for nop padding.
(max_mem_for_rs_align_code): New inline function.
(MAX_MEM_FOR_RS_ALIGN_CODE): Use it.
* config/tc-aarch64.h: Adjust MAX_MEM_FOR_RS_ALIGN_CODE.
* config/tc-alpha.h: Likewise.
* config/tc-arc.h: Likewise.
* config/tc-arm.h: Likewise.
* config/tc-epiphany.h: Likewise.
* config/tc-frv.h: Likewise.
* config/tc-ia64.h: Likewise.
* config/tc-kvx.h: Likewise.
* config/tc-loongarch.h: Likewise.
* config/tc-m32r.h: Likewise.
* config/tc-metag.h: Likewise.
* config/tc-mips.h: Likewise.
* config/tc-nds32.h: Likewise.
* config/tc-ppc.h: Likewise.
* config/tc-riscv.h: Likewise.
* config/tc-rl78.h: Likewise.
* config/tc-rx.h: Likewise.
* config/tc-score.h: Likewise.
* config/tc-sh.h: Likewise.
* config/tc-sparc.h: Likewise.
* config/tc-spu.h: Likewise.
* config/tc-tilegx.h: Likewise.
* config/tc-tilepro.h: Likewise.
* config/tc-visium.h: Likewise.
* config/tc-xtensa.h: Likewise.
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/* tc-rl78.h - header file for Renesas RL78
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Copyright (C) 2011-2025 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#define TC_RL78
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extern int target_little_endian;
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#define LISTING_HEADER "RL78 GAS LE"
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#define LISTING_LHS_WIDTH 8
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#define LISTING_WORD_SIZE 1
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#define TARGET_ARCH bfd_arch_rl78
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#define TARGET_BYTES_BIG_ENDIAN 0
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#define TARGET_FORMAT "elf32-rl78"
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/* We don't need to handle .word strangely. */
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#define WORKING_DOT_WORD
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/* Permit temporary numeric labels. */
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#define LOCAL_LABELS_FB 1
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/* But make sure that the binutils treat them as locals. */
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#define LOCAL_LABEL_PREFIX '.'
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/* Allow classic-style constants. */
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#define NUMBERS_WITH_SUFFIX 1
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/* .-foo gets turned into PC relative relocs. */
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#define DIFF_EXPR_OK
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#define md_end rl78_md_end
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extern void rl78_md_end (void);
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#define md_relax_frag rl78_relax_frag
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extern int rl78_relax_frag (segT, fragS *, long);
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#define TC_FRAG_TYPE struct rl78_bytesT *
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#define TC_FRAG_INIT(fragp, max_bytes) rl78_frag_init (fragp)
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extern void rl78_frag_init (fragS *);
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/* Call md_pcrel_from_section(), not md_pcrel_from(). */
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#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section (FIXP, SEC)
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/* RL78 doesn't have a 32 bit PCREL relocations. */
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#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
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#define TC_VALIDATE_FIX_SUB(FIX, SEG) \
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rl78_validate_fix_sub (FIX)
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extern int rl78_validate_fix_sub (struct fix *);
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#define TC_CONS_FIX_NEW(FRAG, WHERE, NBYTES, EXP, RET) \
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rl78_cons_fix_new (FRAG, WHERE, NBYTES, EXP)
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extern void rl78_cons_fix_new (fragS *, int, int, expressionS *);
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#define tc_fix_adjustable(x) 0
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#define RELOC_EXPANSION_POSSIBLE 1
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#define MAX_RELOC_EXPANSION 8
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#define MAX_MEM_FOR_RS_ALIGN_CODE(p2align, max) 8
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#define HANDLE_ALIGN(SEC, FRAG) rl78_handle_align (FRAG)
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extern void rl78_handle_align (fragS *);
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#define elf_tc_final_processing rl78_elf_final_processing
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extern void rl78_elf_final_processing (void);
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#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \
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((EXP)->X_md = 0, expression (EXP), TC_PARSE_CONS_RETURN_NONE)
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#define TC_LINKRELAX_FIXUP(seg) ((seg->flags & SEC_CODE) || (seg->flags & SEC_DEBUGGING))
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/* Do not adjust relocations involving symbols in code sections,
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because it breaks linker relaxations. This could be fixed in the
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linker, but this fix is simpler, and it pretty much only affects
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object size a little bit. */
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#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC) \
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(GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC) \
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|| ((SEC)->flags & SEC_CODE) != 0 \
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|| ((SEC)->flags & SEC_DEBUGGING) != 0 \
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|| TC_FORCE_RELOCATION (FIX))
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#define DWARF2_USE_FIXED_ADVANCE_PC 1
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#define TC_FORCE_RELOCATION(FIX) (linkrelax)
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