diff options
Diffstat (limited to 'math/math-narrow.h')
| -rw-r--r-- | math/math-narrow.h | 145 |
1 files changed, 61 insertions, 84 deletions
diff --git a/math/math-narrow.h b/math/math-narrow.h index dadbe5cfba..93d1b4c52a 100644 --- a/math/math-narrow.h +++ b/math/math-narrow.h @@ -27,16 +27,20 @@ #include <math-barriers.h> #include <math_private.h> #include <fenv_private.h> +#include <math-narrow-alias.h> /* Carry out a computation using round-to-odd. The computation is EXPR; the union type in which to store the result is UNION and the subfield of the "ieee" field of that union with the low part of the - mantissa is MANTISSA; SUFFIX is the suffix for the libc_fe* macros - to ensure that the correct rounding mode is used, for platforms - with multiple rounding modes where those macros set only the - relevant mode. This macro does not work correctly if the sign of - an exact zero result depends on the rounding mode, so that case - must be checked for separately. */ + mantissa is MANTISSA; SUFFIX is the suffix for both underlying libm + functions for the argument type (for computations where a libm + function rather than a C operator is used when argument and result + types are the same) and the libc_fe* macros to ensure that the + correct rounding mode is used, for platforms with multiple rounding + modes where those macros set only the relevant mode. This macro + does not work correctly if the sign of an exact zero result depends + on the rounding mode, so that case must be checked for + separately. */ #define ROUND_TO_ODD(EXPR, UNION, SUFFIX, MANTISSA) \ ({ \ fenv_t env; \ @@ -273,85 +277,58 @@ } \ while (0) -/* The following macros declare aliases for a narrowing function. The - sole argument is the base name of a family of functions, such as - "add". If any platform changes long double format after the - introduction of narrowing functions, in a way requiring symbol - versioning compatibility, additional variants of these macros will - be needed. */ - -#define libm_alias_float_double_main(func) \ - weak_alias (__f ## func, f ## func) \ - weak_alias (__f ## func, f32 ## func ## f64) \ - weak_alias (__f ## func, f32 ## func ## f32x) - -#ifdef NO_LONG_DOUBLE -# define libm_alias_float_double(func) \ - libm_alias_float_double_main (func) \ - weak_alias (__f ## func, f ## func ## l) -#else -# define libm_alias_float_double(func) \ - libm_alias_float_double_main (func) -#endif - -#define libm_alias_float32x_float64_main(func) \ - weak_alias (__f32x ## func ## f64, f32x ## func ## f64) - -#ifdef NO_LONG_DOUBLE -# define libm_alias_float32x_float64(func) \ - libm_alias_float32x_float64_main (func) \ - weak_alias (__f32x ## func ## f64, d ## func ## l) -#elif defined __LONG_DOUBLE_MATH_OPTIONAL -# define libm_alias_float32x_float64(func) \ - libm_alias_float32x_float64_main (func) \ - weak_alias (__f32x ## func ## f64, __nldbl_d ## func ## l) -#else -# define libm_alias_float32x_float64(func) \ - libm_alias_float32x_float64_main (func) -#endif - -#if __HAVE_FLOAT128 && !__HAVE_DISTINCT_FLOAT128 -# define libm_alias_float_ldouble_f128(func) \ - weak_alias (__f ## func ## l, f32 ## func ## f128) -# define libm_alias_double_ldouble_f128(func) \ - weak_alias (__d ## func ## l, f32x ## func ## f128) \ - weak_alias (__d ## func ## l, f64 ## func ## f128) -#else -# define libm_alias_float_ldouble_f128(func) -# define libm_alias_double_ldouble_f128(func) -#endif - -#if __HAVE_FLOAT64X_LONG_DOUBLE -# define libm_alias_float_ldouble_f64x(func) \ - weak_alias (__f ## func ## l, f32 ## func ## f64x) -# define libm_alias_double_ldouble_f64x(func) \ - weak_alias (__d ## func ## l, f32x ## func ## f64x) \ - weak_alias (__d ## func ## l, f64 ## func ## f64x) -#else -# define libm_alias_float_ldouble_f64x(func) -# define libm_alias_double_ldouble_f64x(func) -#endif - -#define libm_alias_float_ldouble(func) \ - weak_alias (__f ## func ## l, f ## func ## l) \ - libm_alias_float_ldouble_f128 (func) \ - libm_alias_float_ldouble_f64x (func) - -#define libm_alias_double_ldouble(func) \ - weak_alias (__d ## func ## l, d ## func ## l) \ - libm_alias_double_ldouble_f128 (func) \ - libm_alias_double_ldouble_f64x (func) - -#define libm_alias_float64x_float128(func) \ - weak_alias (__f64x ## func ## f128, f64x ## func ## f128) - -#define libm_alias_float32_float128_main(func) \ - weak_alias (__f32 ## func ## f128, f32 ## func ## f128) +/* Check for error conditions from a narrowing square root function + returning RET with argument X and set errno as needed. Overflow + and underflow can occur for finite positive arguments and a domain + error for negative arguments. */ +#define CHECK_NARROW_SQRT(RET, X) \ + do \ + { \ + if (!isfinite (RET)) \ + { \ + if (isnan (RET)) \ + { \ + if (!isnan (X)) \ + __set_errno (EDOM); \ + } \ + else if (isfinite (X)) \ + __set_errno (ERANGE); \ + } \ + else if ((RET) == 0 && (X) != 0) \ + __set_errno (ERANGE); \ + } \ + while (0) -#define libm_alias_float64_float128_main(func) \ - weak_alias (__f64 ## func ## f128, f64 ## func ## f128) \ - weak_alias (__f64 ## func ## f128, f32x ## func ## f128) +/* Implement narrowing square root using round-to-odd. The argument + is X, the return type is TYPE and UNION, MANTISSA and SUFFIX are as + for ROUND_TO_ODD. */ +#define NARROW_SQRT_ROUND_TO_ODD(X, TYPE, UNION, SUFFIX, MANTISSA) \ + do \ + { \ + TYPE ret; \ + \ + ret = (TYPE) ROUND_TO_ODD (sqrt ## SUFFIX (math_opt_barrier (X)), \ + UNION, SUFFIX, MANTISSA); \ + \ + CHECK_NARROW_SQRT (ret, (X)); \ + return ret; \ + } \ + while (0) -#include <math-narrow-alias-float128.h> +/* Implement a narrowing square root function where no attempt is made + to be correctly rounding (this only applies to IBM long double; the + case where the function is not actually narrowing is handled by + aliasing other sqrt functions in libm, not using this macro). The + argument is X and the return type is TYPE. */ +#define NARROW_SQRT_TRIVIAL(X, TYPE, SUFFIX) \ + do \ + { \ + TYPE ret; \ + \ + ret = (TYPE) (sqrt ## SUFFIX (X)); \ + CHECK_NARROW_SQRT (ret, (X)); \ + return ret; \ + } \ + while (0) #endif /* math-narrow.h. */ |