With LAST_UPDATED: "Sat Dec 18 23:55:05 UTC 2004" I get: FAIL: gcc.dg/tree-ssa/loop-4.c scan-tree-dump-times arr_base[^\n\r]*= 0 No clue in gcc.log besides the FAIL: message above. Last known to work with: "Sat Dec 18 18:11:13 UTC 2004". The update did not change the test.
Confirmed, this is not a missed-optimization after all. Patch here to fix the testcase: <http://gcc.gnu.org/ml/gcc-patches/2005-01/msg00486.html>.
The only regression here is the testsuite failure.
And that patch was committed so this is fixed.