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The following patch adds a new option for optimizations related to
replaceable global operators new/delete.
The option isn't called -fassume-sane-operator-new (which clang++
implements), because
1) clang++ option means something different; initially it was an
option to add malloc attribute to those declarations (but we have
malloc attribute on all <new> calls already unconditionally);
later it was changed to add noalias attribute rather than malloc,
whatever it means, but it is certainly about the return value
from the operator new (whether it can alias with other pointers);
we already assume malloc-ish behavior that it doesn't alias any
other pointers
2) the option only affects operator new, we want it affect also
operator delete
The option basically allows to choose between pre-PR101480 behavior
(now the default, more optimistic) and post-PR101480 behavior (safer
but penalizing most of the code in the wild for rare needs).
I've tried to explain stuff in the documentation too.
2024-11-22 Jakub Jelinek <jakub@redhat.com>
PR c++/110137
PR middle-end/101480
gcc/
* doc/invoke.texi (-fassume-sane-operators-new-delete,
-fno-assume-sane-operators-new-delete): Document.
* gimple.cc (gimple_call_fnspec): Handle
-f{,no-}assume-sane-operators-new-delete.
* ipa-inline-transform.cc (inline_call): Also clear
flag_assume_sane_operators_new_delete on caller when inlining
-fno-assume-sane-operators-new-delete callee into
-fassume-sane-operators-new-delete caller.
gcc/c-family/
* c.opt (fassume-sane-operators-new-delete): New option.
gcc/testsuite/
* g++.dg/tree-ssa/pr110137-1.C: New test.
* g++.dg/tree-ssa/pr110137-2.C: New test.
* g++.dg/tree-ssa/pr110137-3.C: New test.
* g++.dg/tree-ssa/pr110137-4.C: New test.
* g++.dg/torture/pr10148.C: Add -fno-assume-sane-operators-new-delete
as dg-additional-options.
* g++.dg/warn/Warray-bounds-16.C: Revert 2021-11-10 changes.
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