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author | Joseph Myers <joseph@codesourcery.com> | 2017-08-25 16:11:13 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2017-08-25 16:11:13 +0000 |
commit | 23761119feea282d2d209a01902e5d92049ea6b6 (patch) | |
tree | 32b8f036ce09018cc923375292a1bedb35b77022 /math/bits | |
parent | bba5c930947e2b440b7d1eafdd3c9e7ff2d28978 (diff) | |
download | glibc-23761119feea282d2d209a01902e5d92049ea6b6.zip glibc-23761119feea282d2d209a01902e5d92049ea6b6.tar.gz glibc-23761119feea282d2d209a01902e5d92049ea6b6.tar.bz2 |
Clean up bits/math-finite.h for aliasing types.
This patch cleans up how bits/math-finite.h handles types that are
ABI-aliases of other types.
For such types, no __*_finite functions exist; instead,
bits/math-finite.h must redirect calls to a the functions for a
canonical choice of type for each floating-point format. (For the
actual public interfaces, symbols need exporting for each type, even
those that are ABI-aliases, because of standard requirements that
programs can declare the functions themselves without including
<math.h>, but that does not apply to __*_finite.)
At present, there is a special-case conditional in bits/math-finite.h
on __MATH_DECLARING_LDOUBLE && defined __NO_LONG_DOUBLE_MATH to handle
redirecting long double function calls to double __*_finite. This
patch replaces this by a more general mechanism. math.h, before each
inclusion of bits/math-finite.h, defines _MSUFTO_ as the suffix to use
on the target of redirection, in addition to the existing _MSUF_.
This way, __MATH_DECLARING_LDOUBLE can go away, as can the special
conditional in bits/math-finite.h. With this patch, math.h is now
prepared for the case of supporting float128 functions as aliases of
long double ones on platforms where long double is binary128, with
_MSUFTO_ appropriately defined for that case, and appropriate _MSUFTO_
definitions can easily be included when supporting _Float32 / _Float64
/ _Float32x / _Float64x (which will always be ABI-aliases of another
type when supported).
Tested for x86_64, and did a compilation test for ARM with
build-many-glibcs.py to cover the long double = double case.
* math/math.h (_MSUFTO_): Define and undefine for each inclusion
of <bits/math-finite.h>.
(__MATH_DECLARING_LDOUBLE): Do not define and undefine for each
inclusion of <bits/math-finite.h>.
* math/bits/math-finite.h (__REDIRTO_X): Do not define
conditionally on [__MATH_DECLARING_LDOUBLE && defined
__NO_LONG_DOUBLE_MATH].
(__MATH_REDIRCALL): Use _MSUFTO_ in __REDIRTO call.
(__MATH_REDIRCALL_2): Likewise.
(__MATH_REDIRCALL_INTERNAL): Likewise.
(__REDIRFROM (lgamma, , _MSUF_)): Likewise.
(__REDIRFROM (gamma, , _MSUF_)): Likewise.
(__REDIRFROM (tgamma, , _MSUF_)): Likewise.
Diffstat (limited to 'math/bits')
-rw-r--r-- | math/bits/math-finite.h | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/math/bits/math-finite.h b/math/bits/math-finite.h index b07ce31..4c82958 100644 --- a/math/bits/math-finite.h +++ b/math/bits/math-finite.h @@ -24,15 +24,8 @@ function ## suffix ## reentrant #define __REDIRFROM(...) __REDIRFROM_X(__VA_ARGS__) -/* Redirect long double versions of the functions to the corresponding - double version if __NO_LONG_DOUBLE_MATH is defined. */ -#if __MATH_DECLARING_LDOUBLE && defined __NO_LONG_DOUBLE_MATH -# define __REDIRTO_X(function, reentrant, suffix) \ - __ ## function ## reentrant ## _finite -#else -# define __REDIRTO_X(function, reentrant, suffix) \ +#define __REDIRTO_X(function, reentrant, suffix) \ __ ## function ## suffix ## reentrant ## _finite -#endif #define __REDIRTO(...) __REDIRTO_X(__VA_ARGS__) #define __MATH_REDIRCALL_X(from, args, to) \ @@ -40,17 +33,17 @@ #define __MATH_REDIRCALL(function, reentrant, args) \ __MATH_REDIRCALL_X \ (__REDIRFROM (function, reentrant, _MSUF_), args, \ - __REDIRTO (function, reentrant, _MSUF_)) + __REDIRTO (function, reentrant, _MSUFTO_)) #define __MATH_REDIRCALL_2(from, reentrant, args, to) \ __MATH_REDIRCALL_X \ (__REDIRFROM (from, reentrant, _MSUF_), args, \ - __REDIRTO (to, reentrant, _MSUF_)) + __REDIRTO (to, reentrant, _MSUFTO_)) #define __MATH_REDIRCALL_INTERNAL(function, reentrant, args) \ __MATH_REDIRCALL_X \ (__REDIRFROM (__CONCAT (__, function), \ __CONCAT (reentrant, _finite), _MSUF_), \ - args, __REDIRTO (function, _r, _MSUF_)) + args, __REDIRTO (function, _r, _MSUFTO_)) /* acos. */ @@ -139,10 +132,10 @@ __extern_always_inline _Mdouble_ __NTH (__REDIRFROM (lgamma, , _MSUF_) (_Mdouble_ __d)) { # if defined __USE_MISC || defined __USE_XOPEN - return __REDIRTO (lgamma, _r, _MSUF_) (__d, &signgam); + return __REDIRTO (lgamma, _r, _MSUFTO_) (__d, &signgam); # else int __local_signgam = 0; - return __REDIRTO (lgamma, _r, _MSUF_) (__d, &__local_signgam); + return __REDIRTO (lgamma, _r, _MSUFTO_) (__d, &__local_signgam); # endif } #endif @@ -153,7 +146,7 @@ __NTH (__REDIRFROM (lgamma, , _MSUF_) (_Mdouble_ __d)) __extern_always_inline _Mdouble_ __NTH (__REDIRFROM (gamma, , _MSUF_) (_Mdouble_ __d)) { - return __REDIRTO (lgamma, _r, _MSUF_) (__d, &signgam); + return __REDIRTO (lgamma, _r, _MSUFTO_) (__d, &signgam); } #endif @@ -200,7 +193,7 @@ __extern_always_inline _Mdouble_ __NTH (__REDIRFROM (tgamma, , _MSUF_) (_Mdouble_ __d)) { int __local_signgam = 0; - _Mdouble_ __res = __REDIRTO (gamma, _r, _MSUF_) (__d, &__local_signgam); + _Mdouble_ __res = __REDIRTO (gamma, _r, _MSUFTO_) (__d, &__local_signgam); return __local_signgam < 0 ? -__res : __res; } #endif |