linux - What's optimal march & mtune options for gcc for "Pentium4 and above" processors -

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my c++ application (compiled using g++) needs work on pentium-4 (32-bit) , above. however, it's typically used core2duo or better processors.

i'm using: -march=pentium4 -mtune=pentium4. reading has prompted me think -march=pentium4 -mtune=generic might better.

can shed light on this? optimal values march & mtune options in case?

platform: gcc 4.1.2 on rhel 5.3 (32-bit).

that -march=pentium4 -mtune=core2, can seen on gcc manual.


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