Extremely slow math execution with Solaris Studio 12.3 Fortran

I have a large Fortran program that I ran on a variety of problems. One case ran extremely slowly compared to all of the others (many hours versus a few minutes) and I managed to boil the problem down to the following program. For some reason, the line "y = (cos(x)**2+sin(x)**2)**1.5" takes several thousand times as long to execute when x is 1.278d-06 as when it is 1.279d-06.
program math_bug
call sub(1.279d-06)
call sub(1.278d-06)
contains
subroutine sub(x)
real(kind=8),intent(in)::x
integer ::i
real(kind=8)::t(2)
real(kind=8)::y
call cpu_time(t(1))
do i=1,10000
y = (cos(x)**2+sin(x)**2)**1.5
enddo
call cpu_time(t(2))
write(*,*) "Time: ",t(2)-t(1)
end subroutine sub
end program math_bug
Output:
Time: 3.1380653381347656E-3
Time: 13.27063798904419
I'm running Solaris Studio 12.3 on Red Hat Enterprise Linux Client release 5.11 (Tikanga) and compiled with no special flags -- simply f95 math_bug.f95 -o math_bug.
Can someone please look into this?
Thanks very much,
Mike

That's a bug in the 64-bit Linux libm library. The default compilation for Studio on Linux is -m64. With that default, you get:
ldd a.out | grep libm.so
        libm.so.6 => /lib64/libm.so.6 (0x0000003fd4600000)
a.out
Time:   1.8830299377441406E-3
Time:   12.055269956588745
However, if you compile with -m32 to create a 32-bit executable (and 32-bit libm), you get:
ldd a.out | grep libm.so
        libm.so.6 => /lib/libm.so.6 (0x008b6000)
[chvu@scapen-ssol5-0 misc]$ a.out
Time:   2.3509999737143516E-3
Time:   2.397000091150403E-3
Therefore, if your app does not require 64-bit address space then you might work around the problem with the -m32 option.
Since, the Linux libm is not produced and shipped by us, there's nothing that we can do about this. This has to be addressed by the Linux community. If this test it turned into a simple C program then I guess you can reproduce the problem with any C compilers. Fortran is high-level language so some Fortran vendors might choose to ship their own math supporting libraries with the compilers and that makes it harder to compare.

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I am running WinXP Media Center 2005 (SP2) on an Intel Pentium D-950 with 2 meg RAM. Prior to installing iTunes 7, the duration of the shutdown procedure could be measured in seconds. However, now that iTunes 7 has been installed, the shutdown process takes more than 3 minutes. Do you have any ideas for fixing this issue?
Intel Pentium D 950 Windows XP Pro Media Center 2005 SP2

My computer (PC) is having the same problem. Songs are importing at 1.0. This is ridiculous! It usually takes less than two minutes for a full music CD to download to my PC using Itunes. It's taking something like forty minutes per song. I tried uninstalling 7 and reinstalling 6 but don't try it because it doesn't work. If you try reinstalling 6, then you get a message saying that you can't load your music because the files were created in a 'newer version of Itunes.' DUH. And I checked and I can't get phone support since I've had my IPOD way over 90 days, but this is the first IPOD/ITUNES problem I've had that doesn't have an obvious answer.

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