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(as.info)Sparc-Opts

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Options
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   The SPARC chip family includes several successive levels, using the
same core instruction set, but including a few additional instructions
at each level.  There are exceptions to this however.  For details on
what instructions each variant supports, please see the chip's
architecture reference manual.

   By default, `as' assumes the core instruction set (SPARC v6), but
"bumps" the architecture level as needed: it switches to successively
higher architectures as it encounters instructions that only exist in
the higher levels.

   If not configured for SPARC v9 (`sparc64-*-*') GAS will not bump
passed sparclite by default, an option must be passed to enable the v9
instructions.

   GAS treats sparclite as being compatible with v8, unless an
architecture is explicitly requested.  SPARC v9 is always incompatible
with sparclite.

`-Av6 | -Av7 | -Av8 | -Asparclet | -Asparclite'
`-Av8plus | -Av8plusa | -Av9 | -Av9a'
     Use one of the `-A' options to select one of the SPARC
     architectures explicitly.  If you select an architecture
     explicitly, `as' reports a fatal error if it encounters an
     instruction or feature requiring an incompatible or higher level.

     `-Av8plus' and `-Av8plusa' select a 32 bit environment.

     `-Av9' and `-Av9a' select a 64 bit environment and are not
     available unless GAS is explicitly configured with 64 bit
     environment support.

     `-Av8plusa' and `-Av9a' enable the SPARC V9 instruction set with
     UltraSPARC extensions.

`-xarch=v8plus | -xarch=v8plusa'
     For compatibility with the Solaris v9 assembler.  These options are
     equivalent to -Av8plus and -Av8plusa, respectively.

`-bump'
     Warn whenever it is necessary to switch to another level.  If an
     architecture level is explicitly requested, GAS will not issue
     warnings until that level is reached, and will then bump the level
     as required (except between incompatible levels).

`-32 | -64'
     Select the word size, either 32 bits or 64 bits.  These options
     are only available with the ELF object file format, and require
     that the necessary BFD support has been included.