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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.
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* tc-metag.h -- Header file for tc-metag.c.
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Copyright (C) 2013-2025 Free Software Foundation, Inc.
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Contributed by Imagination Technologies Ltd.
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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_METAG
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#define LISTING_HEADER "META GAS "
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/* The target BFD architecture. */
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#define TARGET_ARCH bfd_arch_metag
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#define TARGET_FORMAT "elf32-metag"
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#define TARGET_BYTES_BIG_ENDIAN 0
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/* Permit temporary numeric labels. */
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#define LOCAL_LABELS_FB 1
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#define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */
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/* We don't need to handle .word strangely. */
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#define WORKING_DOT_WORD
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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) metag_fix_adjustable (FIX)
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extern bool metag_fix_adjustable (struct fix *);
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#define TC_FORCE_RELOCATION(fix) metag_force_relocation (fix)
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extern int metag_force_relocation (struct fix *);
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#define TC_HANDLES_FX_DONE
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/* Call md_pcrel_from_section(), not md_pcrel_from(). */
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#define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC)
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#define MAX_MEM_FOR_RS_ALIGN_CODE(p2align, max) (3 + 4)
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#define HANDLE_ALIGN(sec, fragp) metag_handle_align (fragp)
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extern void metag_handle_align (struct frag *);
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#define DWARF2_LINE_MIN_INSN_LENGTH 1
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#define md_parse_name(name, exprP, mode, nextcharP) \
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metag_parse_name ((name), (exprP), (mode), (nextcharP))
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extern int metag_parse_name (char const *, expressionS *, enum expr_mode, char *);
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/* This is used to construct expressions out of @GOTOFF, @PLT and @GOT
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symbols. The relocation type is stored in X_md. */
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#define O_PIC_reloc O_md1
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#define TC_CASE_SENSITIVE
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extern const char metag_symbol_chars[];
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#define tc_symbol_chars metag_symbol_chars
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