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authorRichard Biener <rguenther@suse.de>2020-09-23 10:11:03 +0200
committerRichard Biener <rguenther@suse.de>2020-09-23 10:11:03 +0200
commit9e64f17d044767248175fece80a2759d94c45fc4 (patch)
tree0ba70e878d34705b098a986005ee6739a6585b88
parent371f0b990f2bbf638b44da27cf6fc5f86e0d6d4e (diff)
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tree-optimization/97151 - improve PTA for C++ operator delete
C++ operator delete, when DECL_IS_REPLACEABLE_OPERATOR_DELETE_P, does not cause the deleted object to be escaped. It also has no other interesting side-effects for PTA so skip it like we do for BUILT_IN_FREE. 2020-09-23 Richard Biener <rguenther@suse.de> PR tree-optimization/97151 * tree-ssa-structalias.c (find_func_aliases_for_call): DECL_IS_REPLACEABLE_OPERATOR_DELETE_P has no effect on arguments. * g++.dg/cpp1y/new1.C: Adjust for two more handled transforms.
-rw-r--r--gcc/testsuite/g++.dg/cpp1y/new1.C4
-rw-r--r--gcc/tree-ssa-structalias.c2
2 files changed, 4 insertions, 2 deletions
diff --git a/gcc/testsuite/g++.dg/cpp1y/new1.C b/gcc/testsuite/g++.dg/cpp1y/new1.C
index aa5f647d..fec0088 100644
--- a/gcc/testsuite/g++.dg/cpp1y/new1.C
+++ b/gcc/testsuite/g++.dg/cpp1y/new1.C
@@ -69,5 +69,5 @@ test_unused() {
delete p;
}
-/* { dg-final { scan-tree-dump-times "Deleting : operator delete" 5 "cddce1"} } */
-/* { dg-final { scan-tree-dump-times "Deleting : _\\d+ = operator new" 7 "cddce1"} } */
+/* { dg-final { scan-tree-dump-times "Deleting : operator delete" 6 "cddce1"} } */
+/* { dg-final { scan-tree-dump-times "Deleting : _\\d+ = operator new" 8 "cddce1"} } */
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index 44fe52e..f676bf9 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -4857,6 +4857,8 @@ find_func_aliases_for_call (struct function *fn, gcall *t)
point for reachable memory of their arguments. */
else if (flags & (ECF_PURE|ECF_LOOPING_CONST_OR_PURE))
handle_pure_call (t, &rhsc);
+ else if (fndecl && DECL_IS_REPLACEABLE_OPERATOR_DELETE_P (fndecl))
+ ;
else
handle_rhs_call (t, &rhsc);
if (gimple_call_lhs (t))