Author: ed
Date: Fri Jan 6 16:20:17 2012
New Revision: 229704
URL: http://svn.freebsd.org/changeset/base/229704
Log:
Add an even faster implementation of <tgmath.h> for the future.
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.
Modified:
head/include/tgmath.h
Modified: head/include/tgmath.h
==============================================================================
--- head/include/tgmath.h Fri Jan 6 15:07:28 2012 (r229703)
+++ head/include/tgmath.h Fri Jan 6 16:20:17 2012 (r229704)
@@ -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)
\
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