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re PR tree-optimization/77879 (mpd gets miscompiled since r235622) 

2016-10-07  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/77879
	* tree-ssa-structalias.c (handle_const_call): Properly handle
	NRV return slots.
	(handle_pure_call): Likewise.

From-SVN: r240854
This commit is contained in:
Richard Biener 2016-10-07 07:44:47 +00:00 committed by Richard Biener
parent 729232db0b
commit 4023bc5647
2 changed files with 43 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2016-10-07 Richard Biener <rguenther@suse.de>
PR tree-optimization/77879
* tree-ssa-structalias.c (handle_const_call): Properly handle
NRV return slots.
(handle_pure_call): Likewise.
2016-10-06 Aaron Sawdey <acsawdey@linux.vnet.ibm.com>
* config/rs6000/rs6000.c (rs6000_elf_asm_out_constructor)

37
gcc/tree-ssa-structalias.c
View File

@ -4063,15 +4063,34 @@ handle_const_call (gcall *stmt, vec<ce_s> *results)
{
struct constraint_expr rhsc;
unsigned int k;
bool need_uses = false;
/* Treat nested const functions the same as pure functions as far
as the static chain is concerned. */
if (gimple_call_chain (stmt))
{
varinfo_t uses = get_call_use_vi (stmt);
make_constraint_to (uses->id, gimple_call_chain (stmt));
need_uses = true;
}
/* And if we applied NRV the address of the return slot escapes as well. */
if (gimple_call_return_slot_opt_p (stmt)
&& gimple_call_lhs (stmt) != NULL_TREE
&& TREE_ADDRESSABLE (TREE_TYPE (gimple_call_lhs (stmt))))
{
varinfo_t uses = get_call_use_vi (stmt);
auto_vec<ce_s> tmpc;
get_constraint_for_address_of (gimple_call_lhs (stmt), &tmpc);
make_constraints_to (uses->id, tmpc);
need_uses = true;
}
if (need_uses)
{
varinfo_t uses = get_call_use_vi (stmt);
make_any_offset_constraints (uses);
make_transitive_closure_constraints (uses);
make_constraint_to (uses->id, gimple_call_chain (stmt));
rhsc.var = uses->id;
rhsc.offset = 0;
rhsc.type = SCALAR;
@ -4140,6 +4159,22 @@ handle_pure_call (gcall *stmt, vec<ce_s> *results)
make_constraint_to (uses->id, gimple_call_chain (stmt));
}
/* And if we applied NRV the address of the return slot. */
if (gimple_call_return_slot_opt_p (stmt)
&& gimple_call_lhs (stmt) != NULL_TREE
&& TREE_ADDRESSABLE (TREE_TYPE (gimple_call_lhs (stmt))))
{
if (!uses)
{
uses = get_call_use_vi (stmt);
make_any_offset_constraints (uses);
make_transitive_closure_constraints (uses);
}
auto_vec<ce_s> tmpc;
get_constraint_for_address_of (gimple_call_lhs (stmt), &tmpc);
make_constraints_to (uses->id, tmpc);
}
/* Pure functions may return call-used and nonlocal memory. */
if (uses)
{