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This patch adds a flag that controls the replacement of the memory
writes that are in predicated basic blocks with a full write:
for (...)
if (cond)
A[i] = foo
is replaced with:
for (...)
A[i] = cond ? foo : A[i]
In order to do this, we have to call gimple_could_trap_p instead of
gimple_assign_rhs_could_trap_p, as we have to also check that the LHS
of assign stmts does not trap.
* common.opt (ftree-loop-if-convert-stores): New flag.
* doc/invoke.texi (ftree-loop-if-convert-stores): Documented.
* tree-if-conv.c (ifc_temp_var): Pass an extra parameter GSI. Insert
the created statement before GSI.
(if_convertible_phi_p): Allow virtual phi nodes when
flag_loop_if_convert_stores is set.
(if_convertible_gimple_assign_stmt_p): Allow memory reads and writes
Do not handle types that do not match is_gimple_reg_type.
Remove loop and bb parameters. Call gimple_could_trap_p instead of
when flag_loop_if_convert_stores is set, as LHS can contain
memory refs.
(if_convertible_stmt_p): Remove loop and bb parameters. Update calls
to if_convertible_gimple_assign_stmt_p.
(if_convertible_loop_p): Update call to if_convertible_stmt_p.
(replace_phi_with_cond_gimple_assign_stmt): Renamed
predicate_scalar_phi. Do not handle virtual phi nodes.
(ifconvert_phi_nodes): Renamed predicate_all_scalar_phis.
Call predicate_scalar_phi.
(insert_gimplified_predicates): Insert the gimplified predicate of a BB
just after the labels for flag_loop_if_convert_stores, otherwise
insert the predicate in the end of the BB.
(predicate_mem_writes): New.
(combine_blocks): Call predicate_all_scalar_phis. When
flag_loop_if_convert_stores is set, call predicate_mem_writes.
(tree_if_conversion): Call mark_sym_for_renaming when
flag_loop_if_convert_stores is set.
(main_tree_if_conversion): Return TODO_update_ssa_only_virtuals when
flag_loop_if_convert_stores is set.
* gcc.dg/tree-ssa/ifc-4.c: New.
* gcc.dg/tree-ssa/ifc-7.c: New.
From-SVN: r163530
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