Hi, I conducted a benchmark for remove_pointer as well as is_object. Just like the is_object benchmark, here is the benchmark code:
https://github.com/ken-matsui/gcc-benches/blob/main/remove_pointer_benchmark.cc On my computer, using the gcc HEAD of this patch for a release build, the patch with -DUSE_BUILTIN took 8.7% less time and used 4.3-4.9% less memory on average compared to not using it. Although the performance improvement was not as significant as with is_object, the benchmark demonstrated that the compilation was consistently more efficient. Sincerely, Ken Matsui On Thu, Jun 15, 2023 at 5:22 AM Ken Matsui <kmat...@cs.washington.edu> wrote: > > This patch implements built-in trait for std::remove_pointer. > > gcc/cp/ChangeLog: > > * cp-trait.def: Define __remove_pointer. > * semantics.cc (finish_trait_type): Handle CPTK_REMOVE_POINTER. > > gcc/testsuite/ChangeLog: > > * g++.dg/ext/has-builtin-1.C: Test existence of __remove_pointer. > * g++.dg/ext/remove_pointer.C: New test. > > Signed-off-by: Ken Matsui <kmat...@cs.washington.edu> > --- > gcc/cp/cp-trait.def | 1 + > gcc/cp/semantics.cc | 4 ++ > gcc/testsuite/g++.dg/ext/has-builtin-1.C | 3 ++ > gcc/testsuite/g++.dg/ext/remove_pointer.C | 51 +++++++++++++++++++++++ > 4 files changed, 59 insertions(+) > create mode 100644 gcc/testsuite/g++.dg/ext/remove_pointer.C > > diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def > index 8b7fece0cc8..07823e55579 100644 > --- a/gcc/cp/cp-trait.def > +++ b/gcc/cp/cp-trait.def > @@ -90,6 +90,7 @@ DEFTRAIT_EXPR (IS_DEDUCIBLE, "__is_deducible ", 2) > DEFTRAIT_TYPE (REMOVE_CV, "__remove_cv", 1) > DEFTRAIT_TYPE (REMOVE_REFERENCE, "__remove_reference", 1) > DEFTRAIT_TYPE (REMOVE_CVREF, "__remove_cvref", 1) > +DEFTRAIT_TYPE (REMOVE_POINTER, "__remove_pointer", 1) > DEFTRAIT_TYPE (UNDERLYING_TYPE, "__underlying_type", 1) > DEFTRAIT_TYPE (TYPE_PACK_ELEMENT, "__type_pack_element", -1) > > diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc > index 8fb47fd179e..885c7a6fb64 100644 > --- a/gcc/cp/semantics.cc > +++ b/gcc/cp/semantics.cc > @@ -12373,6 +12373,10 @@ finish_trait_type (cp_trait_kind kind, tree type1, > tree type2, > if (TYPE_REF_P (type1)) > type1 = TREE_TYPE (type1); > return cv_unqualified (type1); > + case CPTK_REMOVE_POINTER: > + if (TYPE_PTR_P (type1)) > + type1 = TREE_TYPE (type1); > + return type1; > > case CPTK_TYPE_PACK_ELEMENT: > return finish_type_pack_element (type1, type2, complain); > diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C > b/gcc/testsuite/g++.dg/ext/has-builtin-1.C > index f343e153e56..e21e0a95509 100644 > --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C > +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C > @@ -146,3 +146,6 @@ > #if !__has_builtin (__remove_cvref) > # error "__has_builtin (__remove_cvref) failed" > #endif > +#if !__has_builtin (__remove_pointer) > +# error "__has_builtin (__remove_pointer) failed" > +#endif > diff --git a/gcc/testsuite/g++.dg/ext/remove_pointer.C > b/gcc/testsuite/g++.dg/ext/remove_pointer.C > new file mode 100644 > index 00000000000..7b13db93950 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/ext/remove_pointer.C > @@ -0,0 +1,51 @@ > +// { dg-do compile { target c++11 } } > + > +#define SA(X) static_assert((X),#X) > + > +SA(__is_same(__remove_pointer(int), int)); > +SA(__is_same(__remove_pointer(int*), int)); > +SA(__is_same(__remove_pointer(int**), int*)); > + > +SA(__is_same(__remove_pointer(const int*), const int)); > +SA(__is_same(__remove_pointer(const int**), const int*)); > +SA(__is_same(__remove_pointer(int* const), int)); > +SA(__is_same(__remove_pointer(int** const), int*)); > +SA(__is_same(__remove_pointer(int* const* const), int* const)); > + > +SA(__is_same(__remove_pointer(volatile int*), volatile int)); > +SA(__is_same(__remove_pointer(volatile int**), volatile int*)); > +SA(__is_same(__remove_pointer(int* volatile), int)); > +SA(__is_same(__remove_pointer(int** volatile), int*)); > +SA(__is_same(__remove_pointer(int* volatile* volatile), int* volatile)); > + > +SA(__is_same(__remove_pointer(const volatile int*), const volatile int)); > +SA(__is_same(__remove_pointer(const volatile int**), const volatile int*)); > +SA(__is_same(__remove_pointer(const int* volatile), const int)); > +SA(__is_same(__remove_pointer(volatile int* const), volatile int)); > +SA(__is_same(__remove_pointer(int* const volatile), int)); > +SA(__is_same(__remove_pointer(const int** volatile), const int*)); > +SA(__is_same(__remove_pointer(volatile int** const), volatile int*)); > +SA(__is_same(__remove_pointer(int** const volatile), int*)); > +SA(__is_same(__remove_pointer(int* const* const volatile), int* const)); > +SA(__is_same(__remove_pointer(int* volatile* const volatile), int* > volatile)); > +SA(__is_same(__remove_pointer(int* const volatile* const volatile), int* > const volatile)); > + > +SA(__is_same(__remove_pointer(int&), int&)); > +SA(__is_same(__remove_pointer(const int&), const int&)); > +SA(__is_same(__remove_pointer(volatile int&), volatile int&)); > +SA(__is_same(__remove_pointer(const volatile int&), const volatile int&)); > + > +SA(__is_same(__remove_pointer(int&&), int&&)); > +SA(__is_same(__remove_pointer(const int&&), const int&&)); > +SA(__is_same(__remove_pointer(volatile int&&), volatile int&&)); > +SA(__is_same(__remove_pointer(const volatile int&&), const volatile int&&)); > + > +SA(__is_same(__remove_pointer(int[3]), int[3])); > +SA(__is_same(__remove_pointer(const int[3]), const int[3])); > +SA(__is_same(__remove_pointer(volatile int[3]), volatile int[3])); > +SA(__is_same(__remove_pointer(const volatile int[3]), const volatile > int[3])); > + > +SA(__is_same(__remove_pointer(int(int)), int(int))); > +SA(__is_same(__remove_pointer(int(*const)(int)), int(int))); > +SA(__is_same(__remove_pointer(int(*volatile)(int)), int(int))); > +SA(__is_same(__remove_pointer(int(*const volatile)(int)), int(int))); > -- > 2.41.0 >
