re PR tree-optimization/62112 (Optimize out malloc when block is unused or write-only)
2014-08-21 Marc Glisse <marc.glisse@inria.fr>
PR tree-optimization/62112
gcc/
* gimple-iterator.c (gsi_replace): Return whether EH cleanup is needed.
* gimple-iterator.h (gsi_replace): Return bool.
* tree-ssa-alias.c (ref_may_alias_global_p_1): New helper, code
moved from ref_may_alias_global_p.
(ref_may_alias_global_p, refs_may_alias_p, ref_maybe_used_by_stmt_p):
New overloads.
(ref_maybe_used_by_call_p): Take ao_ref* instead of tree.
(stmt_kills_ref_p_1): Rename...
(stmt_kills_ref_p): ... to this.
* tree-ssa-alias.h (ref_may_alias_global_p, ref_maybe_used_by_stmt_p,
stmt_kills_ref_p): Declare.
* tree-ssa-dse.c (dse_possible_dead_store_p): New argument, use it.
Move the self-assignment case...
(dse_optimize_stmt): ... here. Handle builtin calls. Remove dead code.
gcc/testsuite/
* gcc.dg/tree-ssa/pr62112-1.c: New file.
* gcc.dg/tree-ssa/pr62112-2.c: Likewise.
* gcc.c-torture/execute/pr35472.c: Add noclone attribute.
* gcc.c-torture/execute/
20071219-1.c: Likewise.
From-SVN: r214262