[TriLUG] building code optomized for Duron and Athalon processors using gcc

[Brent Verner]

[2004-09-17 08:21] Ralph Blach said:
| I am trying to build code optimized for the Duron and Athalon processors 
| using gcc.
| 
| What is the correct -mcpu_type for the gcc?

I believe you'd want to use
  
  -march=athlon
    of
  -mcpu=athlon


  -mcpu=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, i486, i586, i686, pentium, pentium-
      mmx, pentiumpro, pentium2, pentium3, pentium4, prescott, nocona,
      k6, k6-2, k6-3, athlon, athlon-tbird, athlon-4, athlon-xp, athlon-
      mp, winchip-c6, winchip2 and c3.

      While picking a specific cpu-type will schedule things appropri-
      ately 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.  i586 is equivalent to pentium and i686 is
      equivalent to pentiumpro.  k6 and athlon are the AMD chips as
      opposed to the Intel ones.

  -march=cpu-type
      Generate instructions for the machine type cpu-type.  The choices
      for cpu-type are the same as for -mcpu.  Moreover, specifying
      -march=cpu-type implies -mcpu=cpu-type.


  b