[Bug gas/22874] GAS does not emit multibyte nops before a function symbol

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22874

--- Comment #5 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by H.J. Lu <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=3ae729d5a4f63740ed9a778960b17c2912b0bbdd

commit 3ae729d5a4f63740ed9a778960b17c2912b0bbdd
Author: H.J. Lu <address@hidden>
Date:   Wed Mar 7 04:18:45 2018 -0800

    x86: Rewrite NOP generation for fill and alignment

    Rewrite NOP generation for fill and code alignment by:

    1. Add a 11-byte NOP with another 0x66 prefix.
    2. Remove the multi-byte NOP entries which consist of 2 instructions.
    3. Select proper NOPs based on ISA and processor tuning.
    4. Generate multiple NOPs with the longer NOPs first followed by the
    shorter NOP.
    5. Use jump for larger NOP padding:
       a. > 8 bytes (2 NOPs) in 16-bit mode.
       b. > 14 bytes (2 NOPs) for older processors.
       c. > 77 bytes (7 NOPs) for newer processors.
    6. Update MAX_MEM_FOR_RS_ALIGN_CODE to 4095.

        PR gas/22874
        * config/tc-i386.c (f32_5): Removed.
        (f32_8): Likewise.
        (f32_9): Likewise.
        (f32_10): Likewise.
        (f32_11): Likewise.
        (f32_12): Likewise.
        (f32_13): Likewise.
        (f32_14): Likewise.
        (f16_5): Likewise.
        (f16_6): Likewise.
        (f16_7): Likewise.
        (f16_8): Likewise.
        (jump_31): Likewise.
        (alt64_11): Likewise.
        (alt64_patt): Likewise.
        (jump_disp8): New.
        (jump32_disp32): Likewise.
        (jump16_disp32): Likewise.
        (alt_11): Likewise.
        (f32_patt): Updated.
        (f16_patt): Likewise.
        (alt_patt): Add alt_11.
        (i386_align_code): Merged with ...
        (i386_generate_nops): This.  Rewritten.
        (fits_in_imm7): Moved before i386_generate_nops.
        (fits_in_imm31): Likewise.
        * config/tc-i386.h (MAX_MEM_FOR_RS_ALIGN_CODE): Updated to
        4095.
        (i386_align_code): Removed.
        (HANDLE_ALIGN): Rewritten with i386_generate_nops.
        * doc/as.texinfo: Update limits of control byte for x86 .nops
        directive.
        * testsuite/gas/i386/i386.exp: Run nops-7 and x86-64-nops-7.
        * gas/testsuite/gas/i386/noavx-3.l: Updated.
        * gas/testsuite/gas/i386/nop-1.d: Likewise.
        * gas/testsuite/gas/i386/nop-1.s: Likewise.
        * gas/testsuite/gas/i386/nop-2.d: Likewise.
        * gas/testsuite/gas/i386/nop-2.s: Likewise.
        * gas/testsuite/gas/i386/nop-3.d: Likewise.
        * gas/testsuite/gas/i386/nop-4.d: Likewise.
        * gas/testsuite/gas/i386/nop-5.d: Likewise.
        * gas/testsuite/gas/i386/nop-5.s: Likewise.
        * gas/testsuite/gas/i386/nop-6.d: Likewise.
        * gas/testsuite/gas/i386/nop-bad-1.l: Likewise.
        * gas/testsuite/gas/i386/nops-1-core2.d: Likewise.
        * gas/testsuite/gas/i386/nops-1-i386-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-1-i386.d: Likewise.
        * gas/testsuite/gas/i386/nops-1-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-1-k8.d: Likewise.
        * gas/testsuite/gas/i386/nops-1.d: Likewise.
        * gas/testsuite/gas/i386/nops-2-core2.d: Likewise.
        * gas/testsuite/gas/i386/nops-2-i386.d: Likewise.
        * gas/testsuite/gas/i386/nops-2.d: Likewise.
        * gas/testsuite/gas/i386/nops-3-i386.d: Likewise.
        * gas/testsuite/gas/i386/nops-3-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-3.d: Likewise.
        * gas/testsuite/gas/i386/nops-4-i386.d: Likewise.
        * gas/testsuite/gas/i386/nops-4-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-4.d: Likewise.
        * gas/testsuite/gas/i386/nops-4a-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-5-i686.d: Likewise.
        * gas/testsuite/gas/i386/nops-5.d: Likewise.
        * gas/testsuite/gas/i386/nops-6.d: Likewise.
        * gas/testsuite/gas/i386/nops16-1.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nop-1.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nop-2.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nop-5.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-1-core2.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-1-g64.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-1-k8.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-1-pentium.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-1.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-2.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-3.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-4-core2.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-4-k8.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-4.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-5-k8.d: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-5.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-1-core2.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-1-k8.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-1-pentium.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-1.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-2.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-3.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-4-core2.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-4-k8.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-4.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-5-k8.d: Likewise.
        * gas/testsuite/gas/i386/ilp32/x86-64-nops-5.d: Likewise.
        * gas/testsuite/gas/i386/nops-7.d: New file.
        * gas/testsuite/gas/i386/nops-7.s: Likewise.
        * gas/testsuite/gas/i386/x86-64-nops-7.d: Likewise.

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