builtin fenv functions

[Marc Glisse <marc.glisse@inria.fr>]

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Hello,

coming back to https://gcc.gnu.org/ml/gcc-patches/2014-02/msg01378.html , 
Richard wanted a complete set of fenv functions instead of just the 2 I 
was interested in. However, most functions in fenv.h handle a struch 
fenv_t or fexcept_t, which makes them inconvenient to handle as builtins. 
Similarly, I don't see div as a builtin in that file, only FILE* has 
special code, but that doesn't seem worth the trouble here. So I am only 
declaring the 5 "simple" functions, with minimal properties: leaf, 
nothrow, and for fegetround pure (glibc already declares it that way). We 
can then discuss the safety of future optimizations on a case by case 
basis.

2017-05-29  Marc Glisse  <marc.glisse@inria.fr>

 	* builtins.def (BUILT_IN_FECLEAREXCEPT, BUILT_IN_FEGETROUND,
 	BUILT_IN_FERAISEEXCEPT, BUILT_IN_FESETROUND,
 	BUILT_IN_FETESTEXCEPT): New builtins.

-- 
Marc Glisse

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Index: gcc/builtins.def
===================================================================
--- gcc/builtins.def	(revision 248468)
+++ gcc/builtins.def	(working copy)
@@ -357,20 +357,25 @@ DEF_C99_C90RES_BUILTIN (BUILT_IN_FABSF,
 DEF_C99_C90RES_BUILTIN (BUILT_IN_FABSL, "fabsl", BT_FN_LONGDOUBLE_LONGDOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 #define FABS_TYPE(F) BT_FN_##F##_##F
 DEF_GCC_FLOATN_NX_BUILTINS (BUILT_IN_FABS, "fabs", FABS_TYPE, ATTR_CONST_NOTHROW_LEAF_LIST)
 #undef FABS_TYPE
 DEF_GCC_BUILTIN        (BUILT_IN_FABSD32, "fabsd32", BT_FN_DFLOAT32_DFLOAT32, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_GCC_BUILTIN        (BUILT_IN_FABSD64, "fabsd64", BT_FN_DFLOAT64_DFLOAT64, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_GCC_BUILTIN        (BUILT_IN_FABSD128, "fabsd128", BT_FN_DFLOAT128_DFLOAT128, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_FDIM, "fdim", BT_FN_DOUBLE_DOUBLE_DOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)
 DEF_C99_BUILTIN        (BUILT_IN_FDIMF, "fdimf", BT_FN_FLOAT_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING_ERRNO)
 DEF_C99_BUILTIN        (BUILT_IN_FDIML, "fdiml", BT_FN_LONGDOUBLE_LONGDOUBLE_LONGDOUBLE, ATTR_MATHFN_FPROUNDING_ERRNO)
+DEF_C99_BUILTIN        (BUILT_IN_FECLEAREXCEPT, "feclearexcept", BT_FN_INT_INT, ATTR_NOTHROW_LEAF_LIST)
+DEF_C99_BUILTIN        (BUILT_IN_FEGETROUND, "fegetround", BT_FN_INT, ATTR_PURE_NOTHROW_LEAF_LIST)
+DEF_C99_BUILTIN        (BUILT_IN_FERAISEEXCEPT, "feraiseexcept", BT_FN_INT_INT, ATTR_NOTHROW_LEAF_LIST)
+DEF_C99_BUILTIN        (BUILT_IN_FESETROUND, "fesetround", BT_FN_INT_INT, ATTR_NOTHROW_LEAF_LIST)
+DEF_C99_BUILTIN        (BUILT_IN_FETESTEXCEPT, "fetestexcept", BT_FN_INT_INT, ATTR_NOTHROW_LEAF_LIST)
 DEF_LIB_BUILTIN        (BUILT_IN_FLOOR, "floor", BT_FN_DOUBLE_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_C90RES_BUILTIN (BUILT_IN_FLOORF, "floorf", BT_FN_FLOAT_FLOAT, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_C90RES_BUILTIN (BUILT_IN_FLOORL, "floorl", BT_FN_LONGDOUBLE_LONGDOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_FMA, "fma", BT_FN_DOUBLE_DOUBLE_DOUBLE_DOUBLE, ATTR_MATHFN_FPROUNDING)
 DEF_C99_BUILTIN        (BUILT_IN_FMAF, "fmaf", BT_FN_FLOAT_FLOAT_FLOAT_FLOAT, ATTR_MATHFN_FPROUNDING)
 DEF_C99_BUILTIN        (BUILT_IN_FMAL, "fmal", BT_FN_LONGDOUBLE_LONGDOUBLE_LONGDOUBLE_LONGDOUBLE, ATTR_MATHFN_FPROUNDING)
 DEF_C99_BUILTIN        (BUILT_IN_FMAX, "fmax", BT_FN_DOUBLE_DOUBLE_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_FMAXF, "fmaxf", BT_FN_FLOAT_FLOAT_FLOAT, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_FMAXL, "fmaxl", BT_FN_LONGDOUBLE_LONGDOUBLE_LONGDOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)
 DEF_C99_BUILTIN        (BUILT_IN_FMIN, "fmin", BT_FN_DOUBLE_DOUBLE_DOUBLE, ATTR_CONST_NOTHROW_LEAF_LIST)