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4bad2e014e
This is similar to x86 (da75c1b180) and powerpc (32ea729996) mathinline.h removal. The required macros to build the fpu routines are moved to mathimpl.h, while the inline optimization macros for atan, tanh, rint, log1p, significand, trunc, floor, ceil, isinf, finite, scalbn, isnan, scalbln, nearbyint, lrint, and sincos are removed. The gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94204 was created to track builtin support. Checked with a build against m68k-linux-gnu, resulting binaries are similar with and without the patch.
318 lines
11 KiB
C
318 lines
11 KiB
C
/* Definitions of libc internal inline math functions implemented
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by the m68881/2.
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Copyright (C) 1991-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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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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#ifndef _MATHIMPL_H
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#define _MATHIMPL_H
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/* This file contains the definitions of the inline math functions that
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are only used internally inside libm, not visible to the user. */
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#define __MATH_INLINE __extern_inline
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/* This is used when defining the functions themselves. Define them with
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__ names, and with `static inline' instead of `extern inline' so the
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bodies will always be used, never an external function call.
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Note: GCC 6 objects to __attribute__ ((__leaf__)) on static functions. */
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#define __m81_u(x) __CONCAT(__,x)
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#define __m81_inline static __inline
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#define __m81_nth(fn) __NTH (fn)
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/* Define a math function. */
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#define __m81_defun(rettype, func, args, attrs) \
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__m81_inline rettype attrs \
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__m81_nth (__m81_u(func) args)
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/* Define the three variants of a math function that has a direct
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implementation in the m68k fpu. FUNC is the name for C (which will be
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suffixed with f and l for the float and long double version, resp). OP
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is the name of the fpu operation (without leading f). */
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# define __inline_mathop(func, op, attrs) \
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__inline_mathop1(double, func, op, attrs) \
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__inline_mathop1(float, __CONCAT(func,f), op, attrs) \
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__inline_mathop1(long double, __CONCAT(func,l), op, attrs)
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#define __inline_mathop1(float_type,func, op, attrs) \
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__m81_defun (float_type, func, (float_type __mathop_x), attrs) \
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{ \
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float_type __result; \
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__asm __volatile__ ("f" __STRING(op) "%.x %1, %0" \
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: "=f" (__result) : "f" (__mathop_x)); \
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return __result; \
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}
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__inline_mathop(__atan, atan,)
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__inline_mathop(__cos, cos,)
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__inline_mathop(__sin, sin,)
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__inline_mathop(__tan, tan,)
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__inline_mathop(__tanh, tanh,)
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__inline_mathop(__fabs, abs, __attribute__ ((__const__)))
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__inline_mathop(__rint, int,)
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__inline_mathop(__expm1, etoxm1,)
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__inline_mathop(__log1p, lognp1,)
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__inline_mathop(__significand, getman,)
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__inline_mathop(__trunc, intrz, __attribute__ ((__const__)))
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/* This macro contains the definition for the rest of the inline
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functions, using FLOAT_TYPE as the domain type and M as a macro
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that adds the suffix for the function names. */
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#define __inline_functions(float_type, m) \
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__m81_defun (float_type, m(__floor), (float_type __x), \
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__attribute__ ((__const__))) \
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{ \
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float_type __result; \
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unsigned long int __ctrl_reg; \
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__asm __volatile__ ("fmove%.l %!, %0" : "=dm" (__ctrl_reg)); \
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/* Set rounding towards negative infinity. */ \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" ((__ctrl_reg & ~0x10) | 0x20)); \
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/* Convert X to an integer, using -Inf rounding. */ \
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__asm __volatile__ ("fint%.x %1, %0" : "=f" (__result) : "f" (__x)); \
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/* Restore the previous rounding mode. */ \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" (__ctrl_reg)); \
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return __result; \
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} \
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\
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__m81_defun (float_type, m(__ceil), (float_type __x), \
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__attribute__ ((__const__))) \
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{ \
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float_type __result; \
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unsigned long int __ctrl_reg; \
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__asm __volatile__ ("fmove%.l %!, %0" : "=dm" (__ctrl_reg)); \
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/* Set rounding towards positive infinity. */ \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" (__ctrl_reg | 0x30)); \
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/* Convert X to an integer, using +Inf rounding. */ \
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__asm __volatile__ ("fint%.x %1, %0" : "=f" (__result) : "f" (__x)); \
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/* Restore the previous rounding mode. */ \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" (__ctrl_reg)); \
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return __result; \
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}
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#define __CONCAT_d(arg) arg
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#define __CONCAT_f(arg) arg ## f
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#define __CONCAT_l(arg) arg ## l
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__inline_functions(double, __CONCAT_d)
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__inline_functions(float, __CONCAT_f)
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__inline_functions(long double, __CONCAT_l)
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#undef __inline_functions
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# define __inline_functions(float_type, m) \
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__m81_defun (int, m(__isinf), (float_type __value), \
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__attribute__ ((__const__))) \
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{ \
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/* There is no branch-condition for infinity, \
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so we must extract and examine the condition codes manually. */ \
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unsigned long int __fpsr; \
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__asm ("ftst%.x %1\n" \
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"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
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return (__fpsr & (2 << 24)) ? (__fpsr & (8 << 24) ? -1 : 1) : 0; \
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} \
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\
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__m81_defun (int, m(__finite), (float_type __value), \
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__attribute__ ((__const__))) \
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{ \
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/* There is no branch-condition for infinity, so we must extract and \
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examine the condition codes manually. */ \
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unsigned long int __fpsr; \
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__asm ("ftst%.x %1\n" \
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"fmove%.l %/fpsr, %0" : "=dm" (__fpsr) : "f" (__value)); \
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return (__fpsr & (3 << 24)) == 0; \
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} \
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\
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__m81_defun (float_type, m(__scalbn), \
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(float_type __x, int __n),) \
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{ \
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float_type __result; \
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__asm __volatile__ ("fscale%.l %1, %0" : "=f" (__result) \
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: "dmi" (__n), "0" (__x)); \
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return __result; \
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}
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__inline_functions(double, __CONCAT_d)
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__inline_functions(float, __CONCAT_f)
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__inline_functions(long double, __CONCAT_l)
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#undef __inline_functions
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# define __inline_functions(float_type, m) \
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__m81_defun (int, m(__isnan), (float_type __value), \
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__attribute__ ((__const__))) \
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{ \
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char __result; \
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__asm ("ftst%.x %1\n" \
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"fsun %0" : "=dm" (__result) : "f" (__value)); \
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return __result; \
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}
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__inline_functions(double, __CONCAT_d)
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__inline_functions(float, __CONCAT_f)
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__inline_functions(long double, __CONCAT_l)
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#undef __inline_functions
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# define __inline_functions(float_type, m) \
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__m81_defun (float_type, m(__scalbln), \
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(float_type __x, long int __n),) \
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{ \
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return m(__scalbn) (__x, __n); \
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} \
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\
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__m81_defun (float_type, m(__nearbyint), (float_type __x),) \
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{ \
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float_type __result; \
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unsigned long int __ctrl_reg; \
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__asm __volatile__ ("fmove%.l %!, %0" : "=dm" (__ctrl_reg)); \
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/* Temporarily disable the inexact exception. */ \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" (__ctrl_reg & ~0x200)); \
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__asm __volatile__ ("fint%.x %1, %0" : "=f" (__result) : "f" (__x)); \
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__asm __volatile__ ("fmove%.l %0, %!" : /* No outputs. */ \
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: "dmi" (__ctrl_reg)); \
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return __result; \
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} \
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\
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__m81_defun (long int, m(__lrint), (float_type __x),) \
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{ \
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long int __result; \
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__asm __volatile__ ("fmove%.l %1, %0" : "=dm" (__result) : "f" (__x)); \
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return __result; \
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}
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__inline_functions (double, __CONCAT_d)
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__inline_functions (float, __CONCAT_f)
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__inline_functions (long double, __CONCAT_l)
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#undef __inline_functions
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#define __inline_functions(float_type, m) \
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__m81_inline void \
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__m81_nth (__m81_u(m(__sincos)) \
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(float_type __x, float_type *__sinx, float_type *__cosx)) \
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{ \
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__asm __volatile__ ("fsincos%.x %2,%1:%0" \
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: "=f" (*__sinx), "=f" (*__cosx) : "f" (__x)); \
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}
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__inline_functions (double, __CONCAT_d)
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__inline_functions (float, __CONCAT_f)
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__inline_functions (long double, __CONCAT_l)
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#undef __inline_functions
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#undef __CONCAT_d
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#undef __CONCAT_f
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#undef __CONCAT_l
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/* Define the three variants of a math function that has a direct
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implementation in the m68k fpu. FUNC is the name for C (which will be
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suffixed with f and l for the float and long double version, resp). OP
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is the name of the fpu operation (without leading f). */
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#define __inline_mathop(func, op, attrs) \
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__inline_mathop1(double, func, op, attrs) \
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__inline_mathop1(float, __CONCAT(func,f), op, attrs) \
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__inline_mathop1(long double, __CONCAT(func,l), op, attrs)
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#define __inline_mathop1(float_type,func, op, attrs) \
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__m81_defun (float_type, func, (float_type __mathop_x), attrs) \
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{ \
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float_type __result; \
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__asm __volatile__ ("f" __STRING(op) "%.x %1, %0" \
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: "=f" (__result) : "f" (__mathop_x)); \
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return __result; \
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}
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__inline_mathop (__ieee754_acos, acos,)
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__inline_mathop (__ieee754_asin, asin,)
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__inline_mathop (__ieee754_cosh, cosh,)
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__inline_mathop (__ieee754_sinh, sinh,)
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__inline_mathop (__ieee754_exp, etox,)
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__inline_mathop (__ieee754_exp2, twotox,)
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__inline_mathop (__ieee754_exp10, tentox,)
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__inline_mathop (__ieee754_log10, log10,)
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__inline_mathop (__ieee754_log2, log2,)
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__inline_mathop (__ieee754_log, logn,)
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__inline_mathop (__ieee754_sqrt, sqrt,)
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__inline_mathop (__ieee754_atanh, atanh,)
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__m81_defun (double, __ieee754_remainder, (double __x, double __y),)
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{
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double __result;
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__asm ("frem%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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__m81_defun (float, __ieee754_remainderf, (float __x, float __y),)
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{
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float __result;
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__asm ("frem%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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__m81_defun (long double,
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__ieee754_remainderl, (long double __x, long double __y),)
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{
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long double __result;
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__asm ("frem%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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__m81_defun (double, __ieee754_fmod, (double __x, double __y),)
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{
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double __result;
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__asm ("fmod%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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__m81_defun (float, __ieee754_fmodf, (float __x, float __y),)
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{
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float __result;
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__asm ("fmod%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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__m81_defun (long double,
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__ieee754_fmodl, (long double __x, long double __y),)
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{
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long double __result;
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__asm ("fmod%.x %1, %0" : "=f" (__result) : "f" (__y), "0" (__x));
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return __result;
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}
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/* Get the m68881 condition codes, to quickly check multiple conditions. */
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static __inline__ unsigned long
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__m81_test (long double __val)
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{
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unsigned long __fpsr;
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__asm ("ftst%.x %1; fmove%.l %/fpsr,%0" : "=dm" (__fpsr) : "f" (__val));
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return __fpsr;
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}
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/* Bit values returned by __m81_test. */
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#define __M81_COND_NAN (1 << 24)
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#define __M81_COND_INF (2 << 24)
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#define __M81_COND_ZERO (4 << 24)
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#define __M81_COND_NEG (8 << 24)
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#endif /* _MATHIMPL_H */
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