topic Re: Intel fortran flags in Intel® Fortran Compiler

Intel fortran flags

cria_ro — Wed, 17 Oct 2007 10:04:02 GMT

Hello,

I am trying to run a fortran porgram on a Fujitsu Celsius W 340 with Intel Pentium 4 3.6 GHz proccessor.

I compile with

ifort -r8 -xN -axP -fast 31.f

When I try to run the program I get the error:

Fatal Error: This program was not built to run on the processor in your system.
The allowed processors are: Intel Core Duo processors and compatible Intel processors with supplemental Streaming SIMD Extensions 3 (SSSE3) instruction support.

What are the proper optimization flags for this proccessor?

Best,

Cristian

Re: Intel fortran flags

TimP — Wed, 17 Oct 2007 13:12:04 GMT

Assuming your CPU supports SSE3, as those made in the last 3 years do, -xP would be OK. It looks like you have a recent compiler in which -fast sets -xT, but you don't have a Core CPU model. If you are certain that you want more aggressive options than -xP, you could add -ipo. I don't normally use anything more aggressive than -xP -assume protect_parens.

Re: Intel fortran flags

cria_ro — Wed, 17 Oct 2007 13:40:10 GMT

Thank youfor the answer! I gues I am just confused about this proccessor related flags. Do you know a link from where I could read about all these flags related to the type of proccessor?

Cristian

Re: Intel fortran flags

Steven_L_Intel1 — Wed, 17 Oct 2007 13:50:04 GMT

Intel Compiler Options for SSE Generation and Processor-Specific Optimizations

Re: Intel fortran flags

Steven_L_Intel1 — Wed, 17 Oct 2007 13:51:16 GMT

I recommend against using -fast, as its meaning changes from release to release.