re PR fortran/9974 (Test g77.f-torture/noncompile/check0.f fails)
PR fortran/9974 * gcse.c (reg_killed_on_egde): New function to test whether the given reg is overwritten by any instruction queued on an edge. (bypass_block): Ignore substitutions killed on incoming edges. Don't bypass outgoing edges that have queued instructions. * gcc.c-torture/execute/20030401-1.c: New test case. From-SVN: r65148
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