Re: Compaq Visual Fortran discontinued: upgrade to Intel Visual Fortran?

In article <rZHif.24530$dO2.10203@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
Tim Prince <tprince@xxxxxxxxxxxxxxxxxx> wrote:
>Vincent wrote:
>> It would be also interesting to know what happens with and AMD Athlon
>> processor. Does the Intel Visual Fortran proposes optimizations for AMD ?
>>
>ifort has options which support both AMD and Intel processors, but none
>which intentionally favor AMD over Intel.

It's worth pointing out that that's not entirely true: IFC is nobbled
for AMD processors (under some circumstances it refuses to allow
SSE/SSE2 code to run on AMD chips). Having said that,

a) this (in my experience) isn't a significant problem for 64-bit code
b) can be easily worked around by either patching the compiler or
patching the executable to remove the 'am I running on an Intel chip'
test (see http://www.swallowtail.org/naughty-intel.html for details)

Intel's checking for the 'GenuineIntel' CPU identifier string and
reducing performance if it isn't found is definitely evidence of 'bad
faith' on their part, so that may inform your decision. However, it does
produce the fastest code for my software, so I use it anyway and hold my
nose :).

--
Mark Mackey http://www.swallowtail.org/
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.

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