Re: [tree-ssa] must-alias analysis

[Daniel Berlin <dberlin at dberlin dot org>]

Diego, this patch breaks the following:

DCE with dom opts and must alias off (flag_tree_dom = 0, 
flag_tree_must_alias = 0)
DCE with dom opts off (flag_tree_dom = 0)
Please fix.

All the DCE problems see something like this:
[dberlin@dberlin gcc]$ stage1/xgcc -Bstage1/ 
-B/usr/local/i686-pc-linux-gnu/bin/ -c   -g -O2  -DIN_GCC   -W -Wall 
-Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic 
-Wno-long-long -Werror -fno-common   -DHAVE_CONFIG_H    -I. -I. 
-I../../gcc -I../../gcc/. -I../../gcc/config -I../../gcc/../include 
-I../../gcc/../libbanshee/libcompat -I../../gcc/../libbanshee 
-I../../gcc/../libbanshee/points-to ../../gcc/tree-cfg.c -o tree-cfg.o  
-fno-tree-dominator-opts../../gcc/tree-cfg.c: In function 
`remove_useless_stmts_and_vars':
../../gcc/tree-cfg.c:1696: internal compiler error: tree check: 
expected ssa_name, have var_decl in process_worklist, at 
tree-ssa-dce.c:424
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

--Dan