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RegisterPass: Disable Polly by default 

We disable Polly by default and add a new option '-polly' that enables Polly.
This allows us to create an the alias

$ alias clang clang -Xclang -load -Xclang LLVMPolly.so

which loads Polly always into clang. It can now be enabled by running:

$ clang -O3 -mllvm -polly file.c

To enable it by default an alias pollycc can be create

$ alias pollycc clang -O3 -mllvm -polly

llvm-svn: 144917
This commit is contained in:
Tobias Grosser 2011-11-17 19:10:48 +00:00
parent be51458dc3
commit 52277852a4
2 changed files with 60 additions and 19 deletions
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35
polly/lib/RegisterPasses.cpp
View File

@ -28,6 +28,10 @@
using namespace llvm;
static cl::opt<bool>
PollyEnabled("polly", cl::desc("Enable the default passes of Polly in -O3"),
cl::init(false));
static cl::opt<bool>
DisableScheduler("polly-no-optimizer",
cl::desc("Disable Polly Scheduling Optimizer"), cl::Hidden,
@ -104,12 +108,37 @@ static StaticInitializer InitializeEverything;
static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
llvm::PassManagerBase &PM) {
if (PollyOnlyPrinter || PollyPrinter || PollyOnlyViewer || PollyViewer ||
ExportJScop || ImportJScop)
PollyEnabled = true;
if (!PollyEnabled) {
if (UsePocc)
errs() << "The option -polly-use-pocc has no effect. "
"Polly was not enabled\n";
if (DisableCodegen)
errs() << "The option -polly-no-codegen has no effect. "
"Polly was not enabled\n";
if (DisableScheduler)
errs() << "The option -polly-no-optimizer has no effect. "
"Polly was not enabled\n";
return;
}
// Polly is only enabled at -O3
if (Builder.OptLevel != 3) {
errs() << "Polly should only be run with -O3. Disabling Polly.\n";
return;
}
bool RunScheduler = !DisableScheduler;
bool RunCodegen = !DisableCodegen;
// Polly is only enabled at -O3
if (Builder.OptLevel != 3)
return;
// A standard set of optimization passes partially taken/copied from the
// set of default optimization passes. It is used to bring the code into

44
polly/www/example_load_Polly_into_clang.html
View File

@ -15,37 +15,49 @@
<h1>Load Polly into clang and automatically run it at -O3</h1>
<!--=====================================================================-->
<p>Warning: This example makes it very easy to use Polly. Still, please be aware
that Polly is a young research project. It is expected to crash, produce
invalid code or to hang in complex calculations even for simple examples. In
case you see such a problem, please check the <a href="bugs.html">Bug
database</a> and consider reporting the bug.
<h2>Compiling code with Polly</h2>
To compile code with Polly you only need to add <b>-Xclang -load -Xclang
${POLLY_BUILD_DIR}/lib/LLVMPolly.so</b> to your command line or your CFLAGS and
Polly is automatically executed at -O3.
<p><b>Warning:</b> Even though this example makes it very easy to use Polly,
you should be aware that Polly is a young research project. It is expected
to crash, produce invalid code or to hang in complex calculations even for
simple examples. In case you see such a problem, please check the <a
href="bugs.html">Bug database</a> and consider reporting a bug.
<p>
<b>WARNING: clang/LLVM/Polly need to be in sync. This means
<b>Warning II:</b> clang/LLVM/Polly need to be in sync. This means
you need to compile them yourself from a recent svn/git checkout</b>
</p>
<h2>Load Polly into clang</h2>
<pre class="code">clang -Xclang -load -Xclang ${POLLY_BUILD_DIR}/lib/LLVMPolly.so -O3 file.c</pre>
By loading Polly into clang (or opt) the Polly options become automatically
available. You can load Polly either by adding the relevant commands to
the CPPFLAGS or by creating an alias.
<pre class="code">
$ export CPPFLAGS="-Xclang -load -Xclang ${POLLY_BUILD_DIR}/lib/LLVMPolly.so"
</pre>
or
<pre class="code">
$ alias pollycc clang -Xclang -load -Xclang ${POLLY_BUILD_DIR}/lib/LLVMPolly.so
</pre>
<h2>Optimizing with Polly</h2>
Optimizing with Polly is as easy as ading <b>-O3 -polly</b> to your compiler
flags (Polly is only available at -O3).
<pre class="code">pollycc -O3 -polly file.c</pre>
<h2>Automatic OpenMP code generation</h2>
To automatically detect parallel loops and generate OpenMP code for them you
also need to add <b>-mllvm -enable-polly-openmp -lgomp</b> to your CFLAGS.
<pre class="code">clang -Xclang -load -Xclang ${POLLY_BUILD_DIR}/lib/LLVMPolly.so -O3 -mllvm -enable-polly-openmp -lgomp file.c</pre>
<pre class="code">pollycc -O3 -mllvm -enable-polly-openmp -lgomp file.c</pre>
<h2>Automatic Vector code generation</h2>
Automatic vector code generation can be enabled by adding <b>-mllvm
-enable-polly-vector</b> to your CFLAGS.
<pre class="code">clang -Xclang -load -Xclang ${POLLY_BUILD_DIR}/lib/LLVMPolly.so -O3 -mllvm -enable-polly-vector file.c</pre>
<pre class="code">pollycc -O3 -mllvm -enable-polly-vector file.c</pre>
<h2>Further options</h2>