[Bug tree-optimization/42641] Random code-generation differences with GRAPHITE

[zsojka at seznam dot cz]

------- Comment #1 from zsojka at seznam dot cz  2010-01-07 12:43 -------
Created an attachment (id=19496)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=19496&action=view)
testcase (not reduced)

While reducing this testcase with delta, different -fcompare-debug problem
appeared (with non-random behaviour, failing with just -O1), so I won't upload
the reduced version here.

Fails randomly with "-O2 -fgraphite-identity -fcompare-debug", x86_64, r156680:
# echo 1 > /proc/sys/kernel/randomize_va_space
$ /mnt/svn/gcc-trunk/binary-155680-lto/bin/g++ -O2 -fgraphite-identity
-fcompare-debug -c dbg_helpers-noempty.ii
$ /mnt/svn/gcc-trunk/binary-155680-lto/bin/g++ -O2 -fgraphite-identity
-fcompare-debug -c dbg_helpers-noempty.ii
$ /mnt/svn/gcc-trunk/binary-155680-lto/bin/g++ -O2 -fgraphite-identity
-fcompare-debug -c dbg_helpers-noempty.ii
g++: dbg_helpers-noempty.ii: -fcompare-debug failure

Also fails randomly with:
-O1 -fcompare-debug -ftree-pre -ftree-vectorize -fgraphite-identity

I tried to compile gcc with patch from comment #0, but it fails with:
../../gcc/sese.c: In function ‘rename_map_elt_info’:
../../gcc/sese.c:81: error: ‘const struct rename_map_elt_s’ has no
member named ‘base’
../../gcc/sese.c:81: warning: passing argument 1 of
‘tree_check_failed’ from incompatible pointer type
../../gcc/sese.c:81: error: ‘const struct rename_map_elt_s’ has no
member named ‘ssa_name’
../../gcc/sese.c:82: warning: control reaches end of non-void function


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42641