[Bug regression/42282] regression: ICE when bootstrapping trunk with -O2 -funswitch-loops

[matt at use dot net]

------- Comment #2 from matt at use dot net  2009-12-07 20:40 -------
Pre-processed output attached. I'm having some trouble getting it to crash
consistently, but here is the valgrind output that might indicate the problem: 

==26996== Conditional jump or move depends on uninitialised value(s)            
==26996==    at 0x70AA99: execute_rtl_store_motion (store-motion.c:271)         
==26996==    by 0x66A091: execute_one_pass (passes.c:1543)                      
==26996==    by 0x66A3A4: execute_pass_list (passes.c:1598)                     
==26996==    by 0x66A3C1: execute_pass_list (passes.c:1599)                     
==26996==    by 0x756D84: tree_rest_of_compilation (tree-optimize.c:413)        
==26996==    by 0x8ACC7A: cgraph_expand_function (cgraphunit.c:1495)            
==26996==    by 0x8AE9C3: cgraph_optimize (cgraphunit.c:1574)                   
==26996==    by 0x8AECE4: cgraph_finalize_compilation_unit (cgraphunit.c:1083)  
==26996==    by 0x41DA4A: c_write_global_declarations (c-decl.c:9489)           
==26996==    by 0x70E683: toplev_main (toplev.c:1061)                           
==26996==    by 0x6561ABC: (below main) (libc-start.c:220)                      
==26996==  Uninitialised value was created by a heap allocation                 
==26996==    at 0x4C25153: malloc (vg_replace_malloc.c:195)                     
==26996==    by 0xB93B4D: xmalloc (xmalloc.c:147)                               
==26996==    by 0x70A932: execute_rtl_store_motion (store-motion.c:1066)        
==26996==    by 0x66A091: execute_one_pass (passes.c:1543)                      
==26996==    by 0x66A3A4: execute_pass_list (passes.c:1598)                     
==26996==    by 0x66A3C1: execute_pass_list (passes.c:1599)                     
==26996==    by 0x756D84: tree_rest_of_compilation (tree-optimize.c:413)        
==26996==    by 0x8ACC7A: cgraph_expand_function (cgraphunit.c:1495)            
==26996==    by 0x8AE9C3: cgraph_optimize (cgraphunit.c:1574)                   
==26996==    by 0x8AECE4: cgraph_finalize_compilation_unit (cgraphunit.c:1083)  
==26996==    by 0x41DA4A: c_write_global_declarations (c-decl.c:9489)           
==26996==    by 0x70E683: toplev_main (toplev.c:1061)                           


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42282