egcs-20000511 i686-pc-linux-gnu g77 crash on -funroll-loops

[N8TM@aol.com]

The attached reduced version of a subroutine from LAPACK-3.0 provokes a 
compiler crash with -funroll-loops, although it appears that no unrolling 
should be done.  Other cases can be shown where this option does not unroll, 
but produces wrong results.

g77 version 2.96 20000511 (experimental) (from FSF-g77 version 0.5.25 
20000511 (experimental))
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.96/specs
gcc version 2.96 20000511 (experimental)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.96/f771 sgbconur.f -quiet 
-dumpbase sgbconur.f -O -version -fversion -funroll-loops -o - |
 as -V -Qy -o sgbconur.o -
GNU F77 version 2.96 20000511 (experimental) (i686-pc-linux-gnu) compiled by 
GNU C version 2.96 20000511 (experimental).
GNU Fortran Front End version 0.5.25 20000511 (experimental)
g77: Internal compiler error: program f771 got fatal signal 11
GNU assembler version 2.9.1 (i386-linux), using BFD version 2.9.1.0.21

Tim
tprince@computer.org