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*FROM GCC 3.4 MANUAL*
3.17.11 Intel 386 and AMD x86-64 Options
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These `-m' options are defined for the i386 and x86-64 family of
computers:

`-mtune=CPU-TYPE'
     Tune to CPU-TYPE everything applicable about the generated code,
     except for the ABI and the set of available instructions.  The
     choices for CPU-TYPE are:
    _i386_
          Original Intel's i386 CPU.

    _i486_
          Intel's i486 CPU.  (No scheduling is implemented for this
          chip.)

    _i586, pentium_
          Intel Pentium CPU with no MMX support.

    _pentium-mmx_
          Intel PentiumMMX CPU based on Pentium core with MMX
          instruction set support.

    _i686, pentiumpro_
          Intel PentiumPro CPU.

    _pentium2_
          Intel Pentium2 CPU based on PentiumPro core with MMX
          instruction set support.

    _pentium3, pentium3m_
          Intel Pentium3 CPU based on PentiumPro core with MMX and SSE
          instruction set support.

    _pentium-m_
          Low power version of Intel Pentium3 CPU with MMX, SSE and
          SSE2 instruction set support.  Used by Centrino notebooks.

    _pentium4, pentium4m_
          Intel Pentium4 CPU with MMX, SSE and SSE2 instruction set
          support.

    _prescott_
          Improved version of Intel Pentium4 CPU with MMX, SSE, SSE2
          and SSE3 instruction set support.

    _nocona_
          Improved version of Intel Pentium4 CPU with 64-bit
          extensions, MMX, SSE, SSE2 and SSE3 instruction set support.

    _k6_
          AMD K6 CPU with MMX instruction set support.

    _k6-2, k6-3_
          Improved versions of AMD K6 CPU with MMX and 3dNOW!
          instruction set support.

    _athlon, athlon-tbird_
          AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and SSE
          prefetch instructions support.

    _athlon-4, athlon-xp, athlon-mp_
          Improved AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and
          full SSE instruction set support.

    _k8, opteron, athlon64, athlon-fx_
          AMD K8 core based CPUs with x86-64 instruction set support.
          (This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and
          64-bit instruction set extensions.)
    _winchip-c6_
          IDT Winchip C6 CPU, dealt in same way as i486 with additional
          MMX instruction set support.

    _winchip2_
          IDT Winchip2 CPU, dealt in same way as i486 with additional
          MMX and 3dNOW!  instruction set support.

    _c3_
          Via C3 CPU with MMX and 3dNOW!  instruction set support.  (No
          scheduling is implemented for this chip.)

    _c3-2_
          Via C3-2 CPU with MMX and SSE instruction set support.  (No
          scheduling is implemented for this chip.)

     While picking a specific CPU-TYPE will schedule things
     appropriately for that particular chip, the compiler will not
     generate any code that does not run on the i386 without the
     `-march=CPU-TYPE' option being used.