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Add an even faster implementation of <tgmath.h> for the future.

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Instead of using an exponential number of cases with respect to the
number of arguments, this version only uses a linear number.
Unfortunately, it works with Clang, GCC 4.6 and GCC 4.7, but not GCC
4.2. Therefore, leave it commented out.
This commit is contained in:
Ed Schouten 2012-01-06 16:20:17 +00:00
parent 48df024e0f
commit 81ec6b6b47
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=229704
1 changed files with 20 additions and 0 deletions
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20
include/tgmath.h
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@ -59,6 +59,25 @@
#error "<tgmath.h> not implemented for this compiler"
#endif
#if 0 /* XXX: Much shorter and faster to compile, but broken with GCC 4.2. */
#define __tg_generic(x, cfnl, cfn, cfnf, fnl, fn, fnf) \
__generic(x, long double _Complex, cfnl, \
__generic(x, double _Complex, cfn, \
__generic(x, float _Complex, cfnf, \
__generic(x, long double, fnl, \
__generic(x, float, fnf, fn)))))
#define __tg_type(x) \
__tg_generic(x, (long double _Complex)0, (double _Complex)0, \
(float _Complex)0, (long double)0, (double)0, (float)0)
#define __tg_impl_simple(x, y, z, fnl, fn, fnf, ...) \
__tg_generic( \
__tg_type(x) + __tg_type(y) + __tg_type(z), \
fnl, fn, fnf, fnl, fn, fnf)(__VA_ARGS__)
#define __tg_impl_full(x, y, cfnl, cfn, cfnf, fnl, fn, fnf, ...) \
__tg_generic( \
__tg_type(x) + __tg_type(y), \
cfnl, cfn, cfnf, fnl, fn, fnf)(__VA_ARGS__)
#else
#define __tg_generic_simple(x, fnl, fn, fnf) \
__generic(x, long double _Complex, fnl, \
__generic(x, double _Complex, fn, \
@ -94,6 +113,7 @@
__tg_generic_full(y, cfnl, cfn , cfn , fnl , fn , fn ), \
__tg_generic_full(y, cfnl, cfn , cfnf, fnl , fn , fnf )) \
(__VA_ARGS__)
#endif
/* Macros to save lots of repetition below */
#define __tg_simple(x, fn) \