[Bug target/100936] %p and %P modifiers should not emit segment overrides

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100936

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Uros Bizjak <uros@gcc.gnu.org>:

https://gcc.gnu.org/g:267dbd42f42c52a515f49c0875d296a9cf5988fe

commit r12-1318-g267dbd42f42c52a515f49c0875d296a9cf5988fe
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Wed Jun 9 09:46:00 2021 +0200

    i386: Do not emit segment overrides for %p and %P [PR100936]

    Using %p to move the address of a symbol using LEA:

      asm ("lea %p1, %0" : "=r"(addr) : "m"(var));

    emits assembler warning when VAR is declared in a non-generic address
space:

      Warning: segment override on `lea' is ineffectual

    The problem is with %p operand modifier, which should emit raw symbol name:

      p -- print raw symbol name.

    Similar problem exists with %P modifier, trying to CALL or JMP to an
    overridden symbol,e.g:

            call %gs:zzz
            jmp %gs:zzz

    emits assembler warning:

      Warning: skipping prefixes on `call'
      Warning: skipping prefixes on `jmp'

    Ensure that %p and %P never emit segment overrides.

    2021-06-08  Uroš Bizjak  <ubizjak@gmail.com>

    gcc/
            PR target/100936
            * config/i386/i386.c (print_operand_address_as): Rename "no_rip"
            argument to "raw".  Do not emit segment overrides when "raw" is
true.

    gcc/testsuite/

            PR target/100936
            * gcc.target/i386/pr100936.c: New test.