Allow multiple input domains to be run in the same benchmark program

Some math functions have distinct performance characteristics in
specific domains of inputs, where some inputs return via a fast path
while other inputs require multiple precision calculations, that too
at different precision levels.  The way to implement different domains
was to have a separate source file and benchmark definition, resulting
in separate programs.

This clutters up the benchmark, so this change allows these domains to
be consolidated into the same input file.  To do this, the input file
format is now enhanced to allow comments with a preceding # and
directives with two # at the begining of a line.  A directive that
looks like:

tells the benchmark generation script that what follows is a different
domain of inputs.  The value of the 'name' directive (in this case,
foo) is used in the output.  The two input domains are then executed
sequentially and their results collated separately.  with the above
directive, there would be two lines in the result that look like:

func(): ....
func(foo): ...

1 files changed, 1 insertions, 44 deletions

diff --git a/benchtests/Makefile b/benchtests/Makefile
index 9d25d6933a..19e1be6f4b 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -39,15 +39,12 @@
 #   See pow-inputs for an example.
 
 subdir := benchtests
-bench := exp pow rint sin cos tan atan modf \
-	 slowexp slowpow slowsin slowcos slowtan slowatan
+bench := exp pow rint sin cos tan atan modf
 
-# exp function fast path: sysdeps/ieee754/dbl-64/e_exp.c
 exp-ARGLIST = double
 exp-RET = double
 LDFLAGS-bench-exp = -lm
 
-# pow function fast path: sysdeps/ieee754/dbl-64/e_pow.c
 pow-ARGLIST = double:double
 pow-RET = double
 LDFLAGS-bench-pow = -lm
@@ -56,62 +53,22 @@ rint-ARGLIST = double
 rint-RET = double
 LDFLAGS-bench-rint = -lm
 
-# exp function slowest path: sysdeps/ieee754/dbl-64/mpexp.c
-slowexp-ARGLIST = double
-slowexp-RET = double
-slowexp-INCLUDE = slowexp.c
-LDFLAGS-bench-slowexp = -lm
-
-# sin function fast path: sysdeps/ieee754/dbl-64/s_sin.c
 sin-ARGLIST = double
 sin-RET = double
 LDFLAGS-bench-sin = -lm
 
-# cos function fast path: sysdeps/ieee754/dbl-64/s_sin.c
 cos-ARGLIST = double
 cos-RET = double
 LDFLAGS-bench-cos = -lm
 
-# tan function fast path: sysdeps/ieee754/dbl-64/s_tan.c
 tan-ARGLIST = double
 tan-RET = double
 LDFLAGS-bench-tan = -lm
 
-# atan function fast path: sysdeps/ieee754/dbl-64/s_atan.c
 atan-ARGLIST = double
 atan-RET = double
 LDFLAGS-bench-atan = -lm
 
-# pow function slowest path: sysdeps/ieee754/dbl-64/slowpow.c
-slowpow-ARGLIST = double:double
-slowpow-RET = double
-slowpow-INCLUDE = slowpow.c
-LDFLAGS-bench-slowpow = -lm
-
-# sin function slowest path: sysdeps/ieee754/dbl-64/sincos32.c
-slowsin-ARGLIST = double
-slowsin-RET = double
-slowsin-INCLUDE = slowsin.c
-LDFLAGS-bench-slowsin = -lm
-
-# cos function slowest path: sysdeps/ieee754/dbl-64/sincos32.c
-slowcos-ARGLIST = double
-slowcos-RET = double
-slowcos-INCLUDE = slowcos.c
-LDFLAGS-bench-slowcos = -lm
-
-# tan function slowest path: sysdeps/ieee754/dbl-64/mptan.c
-slowtan-ARGLIST = double
-slowtan-RET = double
-slowtan-INCLUDE = slowtan.c
-LDFLAGS-bench-slowtan = -lm
-
-# atan function slowest path: sysdeps/ieee754/dbl-64/mpatan.c
-slowatan-ARGLIST = double
-slowatan-RET = double
-slowatan-INCLUDE = slowatan.c
-LDFLAGS-bench-slowatan = -lm
-
 
 
 # Rules to build and execute the benchmarks.  Do not put any benchmark