Delete old benchmark system

Deleted old benchmark system and replaced with most up to date one
which uses googlebench.
Changes to CMakeLists were carried accordingly.
Deleted section in documentation on legacy benchmark system.

docs/4-tools/README.md

@@ -92,85 +92,6 @@ In some cases, it is desirable to fix the last few coefficients to values like
 
 Finding a set of good parameters is not a straightforward process.
 
-<h2 id="benchmark-legacy">Legacy Benchmarking tool</h2>
-
-SLEEF has a tool for measuring and plotting execution time of each function in
-the library. It consists of an executable for measurements, a makefile for
-driving measurement and plotting, and a couple of scripts.
-
-In order to start a measurement, you need to first build the executable for
-measurement. CMake builds the executable along with the library. Please refer
-to [compiling and installing the library](../1-user-guide) for this.
-
-Then, change directory to `sleef/src/libm-benchmarks/`. You also need to set
-the build directory to `BUILDDIR` environment variable. You also need Java
-runtime environment.
-
-```sh
-export BUILDDIR=$PATH:`pwd`/../../build
-```
-
-Type "make measure". After compiling the tools, it will prompt a label for
-measurement. After you input a label, measurement begins. After a measurement
-finishes, you can repeat measurements under different configurations. If you
-want to measure on a different computer, please copy the entire directory on to
-that computer and continue measurements. If you have Intel Compiler installed
-on your computer, you can type "make measureSVML" to measure the computation
-time of SVML functions.
-
-```sh
-make measure
-./measure.sh benchsleef
-       ...
-  Enter label of measurement(e.g. My desktop PC) : Skylake
-  Measurement in progress. This may take several minutes.
-  Sleef_sind2_u10
-  Sleef_cosd2_u10
-  Sleef_tand2_u10
-  Sleef_sincosd2_u10
-       ...
-  Sleef_atanf8_u10
-  Sleef_atan2f8_u10
-  Sleef_atanf8_u35
-  Sleef_atan2f8_u35
-
-  Now, you can plot the results of measurement by 'make plot'.
-  You can do another measurement by 'make measure'.
-  You can start over by 'make restart'.
-```
-
-Then type `make plot` to generate graphs. 
-```sh
-make plot
-  javac ProcessData.java
-  java ProcessData *dptrig*.out
-  gnuplot script.out
-  mv output.png trigdp.png
-  java ProcessData *dpnontrig*.out
-  gnuplot script.out
-  mv output.png nontrigdp.png
-  java ProcessData *sptrig*.out
-  gnuplot script.out
-  mv output.png trigsp.png
-  java ProcessData *spnontrig*.out
-  gnuplot script.out
-  mv output.png nontrigsp.png
-```
-
-You need to have JDK and gnuplot installed on your computer.
-Install these with:
-```sh
-sudo apt install openjdk-19-jdk-headless
-```
-and
-```sh
-sudo apt install gnuplot
-```
-
-Four graphs are generated : trigdp.png, nontrigdp.png, trigsp.png
-and nontrigsp.png. Please see our [benchmark results](../5-performance/) for
-an example of generated graphs by this tool.
-
 <h2 id="benchmark">Benchmarking tool</h2>
 
 This tool uses the [googlebench](https://github.com/google/benchmark) framework to benchmark SLEEF

src/CMakeLists.txt

@@ -8,7 +8,7 @@ endif()
 add_subdirectory("common")
 
 if (SLEEF_BUILD_BENCH)
-  add_subdirectory("benchmarks")
+  add_subdirectory("libm-benchmarks")
 endif()
 
 if (SLEEF_BUILD_DFT)