Processor Dispatch Support (IA-32 only)

-tpp5

Optimizes for the Intel® PentiumŪ processor.
Enables best performance for Pentium processor

-tpp6

Optimizes for the Intel Pentium Pro, Pentium II, and Pentium III processors. Enables best performance for the above processors

-tpp7

Optimizes for the Pentium 4 processor. Requires the RedHat* version 6.2 and support of Streaming SIMD Extensions 2.
Enables best performance for Pentium 4 processor

-ax{i|M|K|W}

Generates, on a single binary, code specialized to the extensions specified by the codes:
i  Pentium Pro, Pentium II processors
M  Pentium with MMX(TM) technology processor
K  Pentium III processor
W  Pentium 4 processor
In addition, -ax generates IA-32 generic code. The generic code is usually slower.
Sets opportunities to generate versions of functions that use instructions supported on the specified processors for the best performance.

-x{i|M|K|W}

Generate specialized code to run exclusively on the processors supporting the extensions indicated by the codes:
i  Pentium Pro, Pentium II processors
M  Pentium with MMX(TM) technology processor
K  Pentium III processor
W  Pentium 4 processor
Sets opportunities to generate versions of functions that use instructions supported on the specified processors for the best performance.