llvm/gpu: Use more aggressive optimizations for GPU target

[jvesely]

Drop PTXExec execution mode.

[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.11):

diff -r docs-base/Composition.html docs-head/Composition.html
1946,1947d1945
< <li><p><a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXExec</span></code></a> – compile individual <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TRIAL</span></code></a>s  for execution on GPU
< (see <a class="reference internal" href="#composition-compilation-ptx"><span class="std std-ref">below</span></a> for additional details).</p></li>
1954,1960c1952,1956
< specifying either <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXRun" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXRun"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXRun</span></code></a> or <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXExec</span></code></a> oin the <strong>execution_mode</strong> argument
< of a <a class="reference internal" href="#composition-execution-methods"><span class="std std-ref">Composition execution method</span></a>, which are equivalent to the LLVM
< counterparts but run in a single thread of a CUDA capable GPU. This requires that a working <a class="reference external" href="https://documen.tician.de/pycuda/">pycuda package</a> is <a class="reference external" href="https://wiki.tiker.net/PyCuda/Installation">installed</a>, and that
< CUDA execution is explicitly enabled by setting the <code class="docutils literal notranslate"><span class="pre">PNL_LLVM_DEBUG</span></code> environment variable to <code class="docutils literal notranslate"><span class="pre">cuda</span></code>.  At present
< compilation using these modes runs on a single GPU thread, and therefore does not produce any performance benefits
< over running in compiled mode on a CPU;  (see <a class="reference external" href="https://github.com/PrincetonUniversity/PsyNeuLink/projects/1">this</a>
< for progress extending support of parallization in compiled modes).</p>
---
> specifying <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXRun" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXRun"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXRun</span></code></a> in the <strong>execution_mode</strong> argument of a <a class="reference internal" href="#composition-execution-methods"><span class="std std-ref">Composition execution
> method</span></a>, which are equivalent to the LLVM counterparts but run in a single
> thread of a CUDA capable GPU. This requires that a working <a class="reference external" href="https://documen.tician.de/pycuda/">pycuda package</a> is
> <a class="reference external" href="https://wiki.tiker.net/PyCuda/Installation">installed</a>, and that CUDA execution is not explicitly disabled by
> setting the <code class="docutils literal notranslate"><span class="pre">PNL_LLVM_DEBUG</span></code> environment variable to <code class="docutils literal notranslate"><span class="pre">nocuda</span></code>.</p>
5316c5312
< <li><p><strong>execution_mode</strong> (<em>enum.Enum</em><em>[</em><em>Auto</em><em>|</em><em>LLVM</em><em>|</em><em>LLVMexec</em><em>|</em><em>Python</em><em>|</em><em>PTXExec</em><em>] </em><em>: default Python</em>) – specifies whether to run using the Python interpreter or a <a class="reference internal" href="#composition-compilation"><span class="std std-ref">compiled mode</span></a>.
---
> <li><p><strong>execution_mode</strong> (<em>enum.Enum</em><em>[</em><em>Auto</em><em>|</em><em>LLVM</em><em>|</em><em>LLVMexec</em><em>|</em><em>Python</em><em>] </em><em>: default Python</em>) – specifies whether to run using the Python interpreter or a <a class="reference internal" href="#composition-compilation"><span class="std std-ref">compiled mode</span></a>.
diff -r docs-base/LLVM.html docs-head/LLVM.html
259,264d258
< <dt class="sig sig-object py" id="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec">
< <span class="sig-name descname"><span class="pre">PTXExec</span></span><a class="headerlink" href="#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="Permalink to this definition">¶</a></dt>
< <dd><p>compile and run each <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TRIAL</span></code></a> using CUDA for GPU.</p>
< </dd></dl>
< 
< <dl class="py attribute">
diff -r docs-base/ModulatoryProjection.html docs-head/ModulatoryProjection.html
272c272
< <a class="reference internal" href="Port.html"><span class="doc">Port</span></a> are listed in the Port’s <a class="reference internal" href="ParameterPort.html#psyneulink.core.components.ports.parameterport.ParameterPort.mod_afferents" title="psyneulink.core.components.ports.parameterport.ParameterPort.mod_afferents"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">mod_afferents</span></code></a> attribute.</p>
---
> <a class="reference internal" href="Port.html"><span class="doc">Port</span></a> are listed in the Port’s <a class="reference internal" href="Mechanism.html#id7" title="psyneulink.core.components.mechanisms.mechanism.Mechanism_Base.mod_afferents"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">mod_afferents</span></code></a> attribute.</p>
diff -r docs-base/Port.html docs-head/Port.html
616c616
< <code class="xref any docutils literal notranslate"><span class="pre">PathWayProjections</span></code> (listed in its <a class="reference internal" href="#psyneulink.core.components.ports.port.Port_Base.path_afferents" title="psyneulink.core.components.ports.port.Port_Base.path_afferents"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">path_afferents</span></code></a> attribute) as the variable for its
---
> <code class="xref any docutils literal notranslate"><span class="pre">PathWayProjections</span></code> (listed in its <a class="reference internal" href="Mechanism.html#id6" title="psyneulink.core.components.mechanisms.mechanism.Mechanism_Base.path_afferents"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">path_afferents</span></code></a> attribute) as the variable for its
diff -r docs-base/TransferFunctions.html docs-head/TransferFunctions.html
2199c2199
< <p><a class="reference internal" href="OptimizationFunctions.html#psyneulink.core.components.functions.optimizationfunctions.GradientOptimization.bounds" title="psyneulink.core.components.functions.optimizationfunctions.GradientOptimization.bounds"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">bounds</span></code></a> – specifies the lower and upper limits of the result;  if there are none, the attribute is set to
---
> <p><a class="reference internal" href="#psyneulink.core.components.functions.transferfunctions.Exponential.bounds" title="psyneulink.core.components.functions.transferfunctions.Exponential.bounds"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">bounds</span></code></a> – specifies the lower and upper limits of the result;  if there are none, the attribute is set to
diff -r docs-base/genindex.html docs-head/genindex.html
5011,5012d5010
<       <li><a href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec">PTXExec (psyneulink.core.llvm.__init__.ExecutionMode attribute)</a>
< </li>
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diff -r docs-base/searchindex.js docs-head/searchindex.js
1c1
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...

See CI logs for the full diff.

[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.11):

diff -r docs-base/Composition.html docs-head/Composition.html
1946,1947d1945
< <li><p><a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXExec</span></code></a> – compile individual <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TRIAL</span></code></a>s  for execution on GPU
< (see <a class="reference internal" href="#composition-compilation-ptx"><span class="std std-ref">below</span></a> for additional details).</p></li>
1954,1960c1952,1956
< specifying either <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXRun" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXRun"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXRun</span></code></a> or <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXExec</span></code></a> oin the <strong>execution_mode</strong> argument
< of a <a class="reference internal" href="#composition-execution-methods"><span class="std std-ref">Composition execution method</span></a>, which are equivalent to the LLVM
< counterparts but run in a single thread of a CUDA capable GPU. This requires that a working <a class="reference external" href="https://documen.tician.de/pycuda/">pycuda package</a> is <a class="reference external" href="https://wiki.tiker.net/PyCuda/Installation">installed</a>, and that
< CUDA execution is explicitly enabled by setting the <code class="docutils literal notranslate"><span class="pre">PNL_LLVM_DEBUG</span></code> environment variable to <code class="docutils literal notranslate"><span class="pre">cuda</span></code>.  At present
< compilation using these modes runs on a single GPU thread, and therefore does not produce any performance benefits
< over running in compiled mode on a CPU;  (see <a class="reference external" href="https://github.com/PrincetonUniversity/PsyNeuLink/projects/1">this</a>
< for progress extending support of parallization in compiled modes).</p>
---
> specifying <a class="reference internal" href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXRun" title="psyneulink.core.llvm.__init__.ExecutionMode.PTXRun"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">ExecutionMode.PTXRun</span></code></a> in the <strong>execution_mode</strong> argument of a <a class="reference internal" href="#composition-execution-methods"><span class="std std-ref">Composition execution
> method</span></a>, which are equivalent to the LLVM counterparts but run in a single
> thread of a CUDA capable GPU. This requires that a working <a class="reference external" href="https://documen.tician.de/pycuda/">pycuda package</a> is
> <a class="reference external" href="https://wiki.tiker.net/PyCuda/Installation">installed</a>, and that CUDA execution is not explicitly disabled by
> setting the <code class="docutils literal notranslate"><span class="pre">PNL_LLVM_DEBUG</span></code> environment variable to <code class="docutils literal notranslate"><span class="pre">nocuda</span></code>.</p>
5316c5312
< <li><p><strong>execution_mode</strong> (<em>enum.Enum</em><em>[</em><em>Auto</em><em>|</em><em>LLVM</em><em>|</em><em>LLVMexec</em><em>|</em><em>Python</em><em>|</em><em>PTXExec</em><em>] </em><em>: default Python</em>) – specifies whether to run using the Python interpreter or a <a class="reference internal" href="#composition-compilation"><span class="std std-ref">compiled mode</span></a>.
---
> <li><p><strong>execution_mode</strong> (<em>enum.Enum</em><em>[</em><em>Auto</em><em>|</em><em>LLVM</em><em>|</em><em>LLVMexec</em><em>|</em><em>Python</em><em>] </em><em>: default Python</em>) – specifies whether to run using the Python interpreter or a <a class="reference internal" href="#composition-compilation"><span class="std std-ref">compiled mode</span></a>.
diff -r docs-base/LLVM.html docs-head/LLVM.html
259,264d258
< <dt class="sig sig-object py" id="psyneulink.core.llvm.__init__.ExecutionMode.PTXExec">
< <span class="sig-name descname"><span class="pre">PTXExec</span></span><a class="headerlink" href="#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec" title="Permalink to this definition">¶</a></dt>
< <dd><p>compile and run each <a class="reference internal" href="Time.html#psyneulink.core.scheduling.time.TimeScale.TRIAL" title="psyneulink.core.scheduling.time.TimeScale.TRIAL"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">TRIAL</span></code></a> using CUDA for GPU.</p>
< </dd></dl>
< 
< <dl class="py attribute">
diff -r docs-base/TransferFunctions.html docs-head/TransferFunctions.html
2199c2199
< <p><a class="reference internal" href="#psyneulink.core.components.functions.transferfunctions.Exponential.bounds" title="psyneulink.core.components.functions.transferfunctions.Exponential.bounds"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">bounds</span></code></a> – specifies the lower and upper limits of the result;  if there are none, the attribute is set to
---
> <p><a class="reference internal" href="OptimizationFunctions.html#psyneulink.core.components.functions.optimizationfunctions.GradientOptimization.bounds" title="psyneulink.core.components.functions.optimizationfunctions.GradientOptimization.bounds"><code class="xref any py py-attr docutils literal notranslate"><span class="pre">bounds</span></code></a> – specifies the lower and upper limits of the result;  if there are none, the attribute is set to
diff -r docs-base/genindex.html docs-head/genindex.html
5011,5012d5010
<       <li><a href="LLVM.html#psyneulink.core.llvm.__init__.ExecutionMode.PTXExec">PTXExec (psyneulink.core.llvm.__init__.ExecutionMode attribute)</a>
< </li>
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1c1
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...

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