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autopar TLC 

The following removes all excessive update_ssa calls from OMP
expansion, thereby rewriting the atomic load and store cases to
GIMPLE code generation.  I don't think autopar ever exercises the
atomics code though.

There's not much test coverage overall so I've built SPEC 2k17
with -floop-parallelize-all -ftree-parallelize-loops=2 with and
without LTO (and otherwise -Ofast plus -march=haswell) without
fallout.

If there's any fallout it's not OK to update SSA form for
each and every OMP stmt lowered.

	* omp-expand.cc (expand_omp_atomic_load): Emit GIMPLE
	directly.  Avoid update_ssa when in SSA form.
	(expand_omp_atomic_store): Likewise.
	(expand_omp_atomic_fetch_op): Avoid update_ssa when in SSA
	form.
	(expand_omp_atomic_pipeline): Likewise.
	(expand_omp_atomic_mutex): Likewise.
	* tree-parloops.cc (gen_parallel_loop): Use
	TODO_update_ssa_no_phi after loop_version.
This commit is contained in:
Richard Biener 2022-08-02 13:46:28 +02:00
parent c64ef5cd92
commit 9aa08cd484
2 changed files with 50 additions and 33 deletions
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79
gcc/omp-expand.cc
View File

@ -8617,7 +8617,7 @@ expand_omp_atomic_load (basic_block load_bb, tree addr,
basic_block store_bb;
location_t loc;
gimple *stmt;
tree decl, call, type, itype;
tree decl, type, itype;
gsi = gsi_last_nondebug_bb (load_bb);
stmt = gsi_stmt (gsi);
@ -8637,23 +8637,33 @@ expand_omp_atomic_load (basic_block load_bb, tree addr,
itype = TREE_TYPE (TREE_TYPE (decl));
enum omp_memory_order omo = gimple_omp_atomic_memory_order (stmt);
tree mo = build_int_cst (NULL, omp_memory_order_to_memmodel (omo));
call = build_call_expr_loc (loc, decl, 2, addr, mo);
tree mo = build_int_cst (integer_type_node,
omp_memory_order_to_memmodel (omo));
gcall *call = gimple_build_call (decl, 2, addr, mo);
gimple_set_location (call, loc);
gimple_set_vuse (call, gimple_vuse (stmt));
gimple *repl;
if (!useless_type_conversion_p (type, itype))
call = fold_build1_loc (loc, VIEW_CONVERT_EXPR, type, call);
call = build2_loc (loc, MODIFY_EXPR, void_type_node, loaded_val, call);
force_gimple_operand_gsi (&gsi, call, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&gsi, true);
{
tree lhs = make_ssa_name (itype);
gimple_call_set_lhs (call, lhs);
gsi_insert_before (&gsi, call, GSI_SAME_STMT);
repl = gimple_build_assign (loaded_val,
build1 (VIEW_CONVERT_EXPR, type, lhs));
gimple_set_location (repl, loc);
}
else
{
gimple_call_set_lhs (call, loaded_val);
repl = call;
}
gsi_replace (&gsi, repl, true);
store_bb = single_succ (load_bb);
gsi = gsi_last_nondebug_bb (store_bb);
gcc_assert (gimple_code (gsi_stmt (gsi)) == GIMPLE_OMP_ATOMIC_STORE);
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
@ -8669,7 +8679,7 @@ expand_omp_atomic_store (basic_block load_bb, tree addr,
basic_block store_bb = single_succ (load_bb);
location_t loc;
gimple *stmt;
tree decl, call, type, itype;
tree decl, type, itype;
machine_mode imode;
bool exchange;
@ -8710,25 +8720,36 @@ expand_omp_atomic_store (basic_block load_bb, tree addr,
if (!useless_type_conversion_p (itype, type))
stored_val = fold_build1_loc (loc, VIEW_CONVERT_EXPR, itype, stored_val);
enum omp_memory_order omo = gimple_omp_atomic_memory_order (stmt);
tree mo = build_int_cst (NULL, omp_memory_order_to_memmodel (omo));
call = build_call_expr_loc (loc, decl, 3, addr, stored_val, mo);
tree mo = build_int_cst (integer_type_node,
omp_memory_order_to_memmodel (omo));
stored_val = force_gimple_operand_gsi (&gsi, stored_val, true, NULL_TREE,
true, GSI_SAME_STMT);
gcall *call = gimple_build_call (decl, 3, addr, stored_val, mo);
gimple_set_location (call, loc);
gimple_set_vuse (call, gimple_vuse (stmt));
gimple_set_vdef (call, gimple_vdef (stmt));
gimple *repl = call;
if (exchange)
{
if (!useless_type_conversion_p (type, itype))
call = build1_loc (loc, VIEW_CONVERT_EXPR, type, call);
call = build2_loc (loc, MODIFY_EXPR, void_type_node, loaded_val, call);
{
tree lhs = make_ssa_name (itype);
gimple_call_set_lhs (call, lhs);
gsi_insert_before (&gsi, call, GSI_SAME_STMT);
repl = gimple_build_assign (loaded_val,
build1 (VIEW_CONVERT_EXPR, type, lhs));
gimple_set_location (repl, loc);
}
force_gimple_operand_gsi (&gsi, call, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&gsi, true);
else
gimple_call_set_lhs (call, loaded_val);
}
gsi_replace (&gsi, repl, true);
/* Remove the GIMPLE_OMP_ATOMIC_LOAD that we verified above. */
gsi = gsi_last_nondebug_bb (load_bb);
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
@ -8874,10 +8895,7 @@ expand_omp_atomic_fetch_op (basic_block load_bb,
gsi_remove (&gsi, true);
if (gimple_in_ssa_p (cfun))
{
release_defs (stmt);
update_ssa (TODO_update_ssa_no_phi);
}
return true;
}
@ -9333,16 +9351,16 @@ expand_omp_atomic_pipeline (basic_block load_bb, basic_block store_bb,
}
/* Remove GIMPLE_OMP_ATOMIC_STORE. */
stmt = gsi_stmt (si);
gsi_remove (&si, true);
if (gimple_in_ssa_p (cfun))
release_defs (stmt);
class loop *loop = alloc_loop ();
loop->header = loop_header;
loop->latch = store_bb;
add_loop (loop, loop_header->loop_father);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}
@ -9399,15 +9417,14 @@ expand_omp_atomic_mutex (basic_block load_bb, basic_block store_bb,
gcc_assert (gimple_code (gsi_stmt (si)) == GIMPLE_OMP_ATOMIC_STORE);
stmt = gimple_build_assign (unshare_expr (mem), stored_val);
gimple_set_vuse (stmt, gimple_vuse (gsi_stmt (si)));
gimple_set_vdef (stmt, gimple_vdef (gsi_stmt (si)));
gsi_insert_before (&si, stmt, GSI_SAME_STMT);
t = builtin_decl_explicit (BUILT_IN_GOMP_ATOMIC_END);
t = build_call_expr (t, 0);
force_gimple_operand_gsi (&si, t, true, NULL_TREE, true, GSI_SAME_STMT);
gsi_remove (&si, true);
if (gimple_in_ssa_p (cfun))
update_ssa (TODO_update_ssa_no_phi);
return true;
}

2
gcc/tree-parloops.cc
View File

@ -3082,7 +3082,7 @@ gen_parallel_loop (class loop *loop,
profile_probability::unlikely (),
profile_probability::likely (),
profile_probability::unlikely (), true);
update_ssa (TODO_update_ssa);
update_ssa (TODO_update_ssa_no_phi);
free_original_copy_tables ();
}