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2008-03-18 Richard Guenther <rguenther@suse.de> * tree-ssa-sccvn.c (visit_reference_op_load): If the lookup found an expression with constants, note that in the VN for the lhs. * tree-ssa-pre.c (eliminate): Visit COND_EXPR statements and fold them to constants if possible. Run cleanup_cfg if done so. (execute_pre): Return todo. (do_pre): Likewise. (execute_fre): Likewise. * tree-ssa-forwprop.c (can_propagate_from): Allow propagation of constants. (get_prop_source_stmt): Look through pointer conversions. * gcc.dg/tree-ssa/forwprop-4.c: New testcase. * gcc.dg/tree-ssa/ssa-fre-16.c: Likewise. From-SVN: r133315
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