Date: Thu, 9 Mar 1995 11:40:48 -0800 (PST) From: Steven G Kargl <kargl@troutmask.apl.washington.edu> To: freebsd-current@freefall.cdrom.com (FreeBSD Current), freebsd-hackers@freefall.cdrom.com (FreeBSD) Subject: optimization is broken for f77 Message-ID: <199503091940.LAA29261@troutmask.apl.washington.edu>
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It appears that optimization of Fortran compilations is broken
if the source code contains continuation lines. I have a code
foo1.f with several continuation lines:
f77 -o foo1 -g foo1.f [compiles and runs and gives foo1.dat]
f77 -o foo2 -g -O foo1.f [compiles but dies with SIGFPE]
f77 -o foo2 -g -O2 foo1.f [compiles but dies with SIGFPE at same place]
The guilty lines looks like
d(1, 2) = (two * fj * fjm1 - xts) * jxl(j)
& + four * xl * jxl(jp1)
All variables are declared double precision, and all values are well
within the machine precision.
If I eliminate all continuation lines from the code, I get
f77 -o bar1 -g bar1.f [compiles and runs and gives bar1.dat]
f77 -o bar2 -g -O bar1.f [compiles and runs and gives bar2.dat]
f77 -o bar2 -g -O2 bar1.f [compiles and runs and gives bar3.dat]
`diff -c foo1.dat bar?.dat' shows no differences in the output of the
executables.
On a different note, I have managed to compile g77-0.5.13 and gcc-2.6.3.
g77 -o goo1 -g foo1.f [compiles and runs and gives goo1.dat]
g77 -o goo2 -g -O foo1.f [compiles and runs and gives goo2.dat]
g77 -o goo2 -g -O2 foo1.f [compiles but dies and gives goo3.dat]
`diff -c foo1.dat goo?.dat' shows no differences in the output of the
executables.
--
Steven G. Kargl | Phone: 206-685-4677 |
Applied Physics Laboratory | Fax: 206-543-6785 |
University of Washington |---------------------|
1013 NE 40th St | FreeBSD 2.1-current |
Seattle, WA 98105 |---------------------|
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