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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.
123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/* tc-m32r.h -- Header file for tc-m32r.c.
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Copyright (C) 1996-2025 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
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the Free Software Foundation, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#define TC_M32R
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#define LISTING_HEADER \
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(target_big_endian ? "M32R GAS" : "M32R GAS Little Endian")
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/* The target BFD architecture. */
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#define TARGET_ARCH bfd_arch_m32r
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/* The endianness of the target format may change based on command
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line arguments. */
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#define TARGET_FORMAT m32r_target_format()
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extern const char *m32r_target_format (void);
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/* Default to big endian. */
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#ifndef TARGET_BYTES_BIG_ENDIAN
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#define TARGET_BYTES_BIG_ENDIAN 1
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#endif
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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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/* Permit temporary numeric labels. */
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#define LOCAL_LABELS_FB 1
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/* '||' denotes parallel instruction */
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#define DOUBLEBAR_PARALLEL
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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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/* For 8 vs 16 vs 32 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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extern long m32r_relax_frag (segT, fragS *, long);
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#define md_relax_frag(segment, fragP, stretch) \
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m32r_relax_frag (segment, fragP, stretch)
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/* Account for nop if 32 bit insn falls on odd halfword boundary. */
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#define TC_CGEN_MAX_RELAX(insn, len) 6
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/* Fill in rs_align_code fragments. */
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extern void m32r_handle_align (fragS *);
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#define HANDLE_ALIGN(s, f) m32r_handle_align (f)
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#define MAX_MEM_FOR_RS_ALIGN_CODE(p2align, max) (1 + 2 + 4)
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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 md_apply_fix gas_cgen_md_apply_fix
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#define tc_fix_adjustable(FIX) m32r_fix_adjustable (FIX)
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extern bool m32r_fix_adjustable (struct fix *);
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/* After creating a fixup for an instruction operand, we need to check for
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HI16 relocs and queue them up for later sorting. */
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#define md_cgen_record_fixup_exp m32r_cgen_record_fixup_exp
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#define TC_HANDLES_FX_DONE
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extern int pic_code;
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#define tc_frob_file_before_fix() m32r_frob_file ()
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extern void m32r_frob_file (void);
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/* No shared lib support, so we don't need to ensure externally
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visible symbols can be overridden.
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#define EXTERN_FORCE_RELOC 0 */
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/* When relaxing, we need to emit various relocs we otherwise wouldn't. */
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#define TC_FORCE_RELOCATION(fix) m32r_force_relocation (fix)
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extern int m32r_force_relocation (struct fix *);
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/* Ensure insns at labels are aligned to 32 bit boundaries. */
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int m32r_fill_insn (int);
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#define TC_START_LABEL(STR, NUL_CHAR, NEXT_CHAR) \
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(NEXT_CHAR == ':' && m32r_fill_insn (0))
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#define md_cleanup() m32r_fill_insn (1)
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#define md_elf_section_change_hook m32r_elf_section_change_hook
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extern void m32r_elf_section_change_hook (void);
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#define md_flush_pending_output() m32r_flush_pending_output ()
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extern void m32r_flush_pending_output (void);
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#define elf_tc_final_processing m32r_elf_final_processing
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extern void m32r_elf_final_processing (void);
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#define md_parse_name(name, exprP, mode, nextcharP) \
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m32r_parse_name ((name), (exprP), (mode), (nextcharP))
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extern int m32r_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_CGEN_PARSE_FIX_EXP(opinfo, exp) \
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m32r_cgen_parse_fix_exp(opinfo, exp)
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extern int m32r_cgen_parse_fix_exp (int, expressionS *);
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