This patch implements built-in trait for std::is_floating_point.
gcc/cp/ChangeLog:
* cp-trait.def: Define __is_floating_point.
* constraint.cc (diagnose_trait_expr): Handle
CPTK_IS_FLOATING_POINT.
* semantics.cc (trait_expr_value): Likewise.
(finish_trait_expr): Likewise.
(floating_point_type_p): New function.
gcc/testsuite/ChangeLog:
* g++.dg/ext/has-builtin-1.C: Test existence of
__is_floating_point.
* g++.dg/ext/is_floating_point.C: New test.
Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
---
gcc/cp/constraint.cc | 3 ++
gcc/cp/cp-trait.def | 1 +
gcc/cp/semantics.cc | 17 ++++++++
gcc/testsuite/g++.dg/ext/has-builtin-1.C | 3 ++
gcc/testsuite/g++.dg/ext/is_floating_point.C | 43 ++++++++++++++++++++
5 files changed, 67 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/ext/is_floating_point.C
diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 3a105a2ee2a..aca0b91711f 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3752,6 +3752,9 @@ diagnose_trait_expr (tree expr, tree args)
case CPTK_IS_FINAL:
inform (loc, " %qT is not a final class", t1);
break;
+ case CPTK_IS_FLOATING_POINT:
+ inform (loc, " %qT is not a floating point type", t1);
+ break;
case CPTK_IS_FUNCTION:
inform (loc, " %qT is not a function", t1);
break;
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index 2773c3fa10e..acf668d48ee 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -69,6 +69,7 @@ DEFTRAIT_EXPR (IS_CONVERTIBLE, "__is_convertible", 2)
DEFTRAIT_EXPR (IS_EMPTY, "__is_empty", 1)
DEFTRAIT_EXPR (IS_ENUM, "__is_enum", 1)
DEFTRAIT_EXPR (IS_FINAL, "__is_final", 1)
+DEFTRAIT_EXPR (IS_FLOATING_POINT, "__is_floating_point", 1)
DEFTRAIT_EXPR (IS_FUNCTION, "__is_function", 1)
DEFTRAIT_EXPR (IS_INTEGRAL, "__is_integral", 1)
DEFTRAIT_EXPR (IS_LAYOUT_COMPATIBLE, "__is_layout_compatible", 2)
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 1a335f69826..c052e47c204 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12272,6 +12272,19 @@ integral_type_p (const_tree t)
return CP_INTEGRAL_TYPE_P (t);
}
+/* Return true if T is a floating point type. With __STRICT_ANSI__, __float128
+ is not a floating point type. However, _Float128 is a floating point type.
+ */
+
+static bool
+floating_point_type_p (const_tree t)
+{
+ if (flag_iso)
+ return SCALAR_FLOAT_TYPE_P (t) && t != float128t_type_node;
+ else
+ return SCALAR_FLOAT_TYPE_P (t);
+}
+
/* Fold __builtin_is_corresponding_member call. */
tree
@@ -12476,6 +12489,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree
type2)
case CPTK_IS_FINAL:
return CLASS_TYPE_P (type1) && CLASSTYPE_FINAL (type1);
+ case CPTK_IS_FLOATING_POINT:
+ return floating_point_type_p (type1);
+
case CPTK_IS_FUNCTION:
return type_code1 == FUNCTION_TYPE;
@@ -12707,6 +12723,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind,
tree type1, tree type2)
case CPTK_IS_BOUNDED_ARRAY:
case CPTK_IS_CLASS:
case CPTK_IS_ENUM:
+ case CPTK_IS_FLOATING_POINT:
case CPTK_IS_FUNCTION:
case CPTK_IS_INTEGRAL:
case CPTK_IS_MEMBER_FUNCTION_POINTER:
diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
index d621171481c..5dc70a19e79 100644
--- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
+++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
@@ -86,6 +86,9 @@
#if !__has_builtin (__is_final)
# error "__has_builtin (__is_final) failed"
#endif
+#if !__has_builtin (__is_floating_point)
+# error "__has_builtin (__is_floating_point) failed"
+#endif
#if !__has_builtin (__is_function)
# error "__has_builtin (__is_function) failed"
#endif
diff --git a/gcc/testsuite/g++.dg/ext/is_floating_point.C
b/gcc/testsuite/g++.dg/ext/is_floating_point.C
new file mode 100644
index 00000000000..1807279dfc2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_floating_point.C
@@ -0,0 +1,43 @@
+// { dg-do compile { target c++11 } }
+
+#define SA(X) static_assert((X),#X)
+
+#define SA_TEST_CATEGORY(TRAIT, TYPE, EXPECT) \
+ SA(TRAIT(TYPE) == EXPECT); \
+ SA(TRAIT(const TYPE) == EXPECT); \
+ SA(TRAIT(volatile TYPE) == EXPECT); \
+ SA(TRAIT(const volatile TYPE) == EXPECT)
+
+SA_TEST_CATEGORY(__is_floating_point, void, false);
+SA_TEST_CATEGORY(__is_floating_point, char, false);
+SA_TEST_CATEGORY(__is_floating_point, signed char, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned char, false);
+SA_TEST_CATEGORY(__is_floating_point, wchar_t, false);
+SA_TEST_CATEGORY(__is_floating_point, short, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned short, false);
+SA_TEST_CATEGORY(__is_floating_point, int, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned int, false);
+SA_TEST_CATEGORY(__is_floating_point, long, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned long, false);
+SA_TEST_CATEGORY(__is_floating_point, long long, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned long long, false);
+
+SA_TEST_CATEGORY(__is_floating_point, float, true);
+SA_TEST_CATEGORY(__is_floating_point, double, true);
+SA_TEST_CATEGORY(__is_floating_point, long double, true);
+
+#ifndef __STRICT_ANSI__
+// GNU Extensions.
+#ifdef _GLIBCXX_USE_FLOAT128
+SA_TEST_CATEGORY(__is_floating_point, __float128, true);
+#endif
+
+#ifdef __SIZEOF_INT128__
+SA_TEST_CATEGORY(__is_floating_point, __int128, false);
+SA_TEST_CATEGORY(__is_floating_point, unsigned __int128, false);
+#endif
+#endif
+
+// Sanity check.
+class ClassType { };
+SA_TEST_CATEGORY(__is_floating_point, ClassType, false);
--
2.43.0
