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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.
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/* tc-epiphany.h -- Header file for tc-epiphany.c.
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Copyright (C) 2009-2025 Free Software Foundation, Inc.
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Contributed by Embecosm on behalf of Adapteva, 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_EPIPHANY
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#define LISTING_HEADER "EPIPHANY GAS "
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/* The target BFD architecture. */
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#define TARGET_ARCH bfd_arch_epiphany
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#define TARGET_FORMAT "elf32-epiphany"
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/* Permit temporary numeric labels. */
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#define LOCAL_LABELS_FB 1
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/* .-foo gets turned into PC relative relocs. */
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#define DIFF_EXPR_OK
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/* We don't need to handle .word strangely. */
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#define WORKING_DOT_WORD
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#define LITERAL_PREFIXPERCENT_BIN
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#define DOUBLESLASH_LINE_COMMENTS
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#define GAS_CGEN_PCREL_R_TYPE(R_TYPE) gas_cgen_pcrel_r_type (R_TYPE)
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/* Values passed to md_apply_fix don't include the symbol value. */
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#define MD_APPLY_SYM_VALUE(FIX) 0
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#define tc_fix_adjustable(FIX) epiphany_fix_adjustable (FIX)
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extern bool epiphany_fix_adjustable (struct fix *);
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#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section (FIXP,SEC)
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#define TC_HANDLES_FX_DONE
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#define elf_tc_final_processing epiphany_elf_final_processing
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extern void epiphany_elf_final_processing (void);
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#define md_elf_section_flags epiphany_elf_section_flags
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extern int epiphany_elf_section_flags (int, int, int);
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#define md_operand(x) epiphany_cgen_md_operand (x)
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extern void epiphany_cgen_md_operand (expressionS *);
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/* Values passed to md_apply_fix don't include the symbol value. */
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#define MD_APPLY_SYM_VALUE(FIX) 0
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#define TC_CGEN_MAX_RELAX(insn, len) 4
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#define O_PIC_reloc O_md1
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#define TC_CGEN_PARSE_FIX_EXP(opinfo, exp) \
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epiphany_cgen_parse_fix_exp (opinfo, exp)
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extern int epiphany_cgen_parse_fix_exp (int, expressionS *);
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#define HANDLE_ALIGN(s, f) epiphany_handle_align (f)
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extern void epiphany_handle_align (fragS *);
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#define MAX_MEM_FOR_RS_ALIGN_CODE(p2align, max) (1 + 2)
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#define TARGET_FORMAT "elf32-epiphany"
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#define md_relax_frag epiphany_relax_frag
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extern long epiphany_relax_frag (segT, fragS *, long);
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/* If you don't define md_relax_frag, md_cgen_record_fixup_exp
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but do have TC_GENERIC_RELAX_TABLE gas will do the relaxation for you.
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If we have to add support for %LO and %HI relocations, we probably need
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to define the fixup_exp function to generate fancier relocations. */
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/* For 8 vs 24 bit branch selection. */
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extern const struct relax_type md_relax_table[];
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#define TC_GENERIC_RELAX_TABLE md_relax_table
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#define tc_gen_reloc gas_cgen_tc_gen_reloc
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#define md_apply_fix epiphany_apply_fix
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#include "write.h"
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extern void epiphany_apply_fix (fixS *fixP, valueT *valP, segT seg);
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