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Add C23 long_double_t, _FloatN_t
C23 Annex H adds <math.h> typedefs long_double_t and _FloatN_t (originally introduced in TS 18661-3), analogous to float_t and double_t. Add these typedefs to glibc. (There are no _FloatNx_t typedefs.) C23 also slightly changes the rules for how such typedef names should be defined, compared to the definition in TS 18661-3. In both cases, <TYPE>_t corresponds to the evaluation format for <TYPE>, as specified by FLT_EVAL_METHOD (for which <math.h> uses glibc's internal __GLIBC_FLT_EVAL_METHOD). Specifically, each FLT_EVAL_METHOD value corresponds to some type U (for example, 64 corresponds to U = _Float64), and for types with exactly the same set of values as U, TS 18661-3 says expressions with those types are to be evaluated to the range and precision of type U (so <TYPE>_t is defined to U), whereas C23 only does that for types whose values are a strict subset of those of type U (so <TYPE>_t is defined to <TYPE>). As with other cases where semantics changed between TS 18661 and C23, this patch only implements the newer version of the semantics (including adjusting existing definitions of float_t and double_t as needed). The new semantics are contradictory between the main standard and Annex H for the case of FLT_EVAL_METHOD == 2 and the choice of double_t when double and long double have the same values (the main standard says it's defined as long double in that case, whereas Annex H would define it as double), which I've raised on the WG14 reflector (but I think setting FLT_EVAL_METHOD == 2 when double and long double have the same values is a fairly theoretical combination of features); for now glibc follows the value in the main standard in that case. Note that I think all existing GCC targets supported by glibc only use values -1, 0, 1, 2 or 16 for FLT_EVAL_METHOD (so most of the header code is somewhat theoretical, though potentially relevant with other compilers since the choice of FLT_EVAL_METHOD is only an API choice, not an ABI one; it can vary with compiler options, and these typedefs should not be used in ABIs). The testcase (expanded to cover the new typedefs) is really just repeating the same logic in a second place (so all it really tests is that __GLIBC_FLT_EVAL_METHOD is consistent with FLT_EVAL_METHOD). Tested for x86_64 and x86, and with build-many-glibcs.py.
This commit is contained in:
Joseph Myers
@@ -16,6 +16,7 @@
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define __STDC_WANT_IEC_60559_TYPES_EXT__
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#include <float.h>
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#include <math.h>
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@@ -23,33 +24,191 @@
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/* Cannot test. */
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typedef float_t my_float_t;
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typedef double_t my_double_t;
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#elif FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 16
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typedef long_double_t my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float16_t my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float32_t my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64_t my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128_t my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 0
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typedef float my_float_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef float my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float32 my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 1
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typedef double my_float_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef double my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef double my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 2
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typedef long double my_float_t;
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typedef long double my_double_t;
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#elif FLT_EVAL_METHOD == 32
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typedef _Float32 my_float_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef long double my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef long double my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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# ifdef __NO_LONG_DOUBLE_MATH
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typedef _Float64 my_Float64_t;
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# else
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typedef long double my_Float64_t;
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# endif
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 16
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typedef float my_float_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float16 my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float32 my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 32
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typedef float my_float_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float32 my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float32 my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 33
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typedef _Float32x my_float_t;
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typedef _Float32x my_double_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float32x my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float32x my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 64
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typedef _Float64 my_float_t;
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typedef _Float64 my_double_t;
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typedef double my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float64 my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float64 my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 65
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typedef _Float64x my_float_t;
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typedef _Float64x my_double_t;
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typedef long double my_long_double_t;
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# if __HAVE_FLOAT16
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typedef _Float64x my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float64x my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float64x my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 128
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typedef _Float128 my_float_t;
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typedef _Float128 my_double_t;
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# if __HAVE_FLOAT128_UNLIKE_LDBL && __LDBL_MANT_DIG__ != 106
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typedef _Float128 my_long_double_t;
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# else
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typedef long double my_long_double_t;
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# endif
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# if __HAVE_FLOAT16
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typedef _Float128 my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float128 my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float128 my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128 my_Float128_t;
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# endif
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#elif FLT_EVAL_METHOD == 129
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typedef _Float128x my_float_t;
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typedef _Float128x my_double_t;
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# if __LDBL_MANT_DIG__ != 106
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typedef _Float128x my_long_double_t;
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# else
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typedef long double my_long_double_t;
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# endif
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# if __HAVE_FLOAT16
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typedef _Float128x my_Float16_t;
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# endif
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# if __HAVE_FLOAT32
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typedef _Float128x my_Float32_t;
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# endif
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# if __HAVE_FLOAT64
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typedef _Float128x my_Float64_t;
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# endif
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# if __HAVE_FLOAT128
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typedef _Float128x my_Float128_t;
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# endif
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#else
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# error "Unknown FLT_EVAL_METHOD"
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#endif
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@@ -60,6 +219,29 @@ extern my_float_t test_float_t;
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extern double_t test_double_t;
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extern my_double_t test_double_t;
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extern long_double_t test_long_double_t;
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extern my_long_double_t test_long_double_t;
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#if __HAVE_FLOAT16
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extern _Float16_t test_Float16_t;
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extern my_Float16_t test_Float16_t;
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#endif
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#if __HAVE_FLOAT32
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extern _Float32_t test_Float32_t;
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extern my_Float32_t test_Float32_t;
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#endif
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#if __HAVE_FLOAT64
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extern _Float64_t test_Float64_t;
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extern my_Float64_t test_Float64_t;
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#endif
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#if __HAVE_FLOAT128
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extern _Float128_t test_Float128_t;
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extern my_Float128_t test_Float128_t;
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#endif
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/* This is a compilation test. */
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#define TEST_FUNCTION 0
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#include "../test-skeleton.c"
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