[Bug bootstrap/54128] GCC does not bootstrap on little endian mips due to mis-compare on tree-data-ref.c

[sje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54128

--- Comment #5 from Steve Ellcey <sje at gcc dot gnu.org> 2012-08-09 23:46:52 UTC ---
Created attachment 27976
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27976
Cutdown test case

I have attached a new test case, cut down from the original.  I have duplicated
the bug using a x86 to mips cross compiler and the mips-unknown-linux-gnu
target
so it doesn't look specific to little-endian.  I get the difference in
instruction scheduling with -mips1 or -mips32r2 and with no options other then
-O2 so it doesn't seem specific to a particular mips architecture either.

The difference with and without -g is in the instruction scheduling and
sometimes with the register selection.