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Allow to run the Polly preopt passes with -O0

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To extract a preoptimized LLVM-IR file from a C-file run:

clang -Xclang -load -Xclang LLVMPolly.so -O0 -mllvm -polly file.c -S -emit-llvm

On the generated file you can directly run passes such as:
'opt -view-scops file.s'

llvm-svn: 146560
This commit is contained in:
Tobias Grosser
2011-12-14 12:21:31 +00:00
parent 5c28af1c23
commit e1bc007afa
2 changed files with 49 additions and 30 deletions
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69
polly/lib/RegisterPasses.cpp
View File

@@ -109,36 +109,8 @@ public:
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 (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;
static void registerPollyPreoptPasses(const llvm::PassManagerBuilder &Builder,
llvm::PassManagerBase &PM) {
// A standard set of optimization passes partially taken/copied from the
// set of default optimization passes. It is used to bring the code into
// a canonical form that can than be analyzed by Polly. This set of passes is
@@ -168,6 +140,40 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
// recover them
PM.add(llvm::createIndVarSimplifyPass());
PM.add(polly::createRegionSimplifyPass());
}
static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
llvm::PassManagerBase &PM) {
if (Builder.OptLevel == 0)
return;
if (PollyOnlyPrinter || PollyPrinter || PollyOnlyViewer || PollyViewer ||
ExportJScop || ImportJScop)
PollyEnabled = true;
if (!PollyEnabled) {
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;
registerPollyPreoptPasses(Builder, PM);
if (PollyViewer)
PM.add(polly::createDOTViewerPass());
@@ -216,3 +222,6 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
static llvm::RegisterStandardPasses
PassRegister(llvm::PassManagerBuilder::EP_EarlyAsPossible,
registerPollyPasses);
static llvm::RegisterStandardPasses
PassRegisterPreopt(llvm::PassManagerBuilder::EP_EnabledOnOptLevel0,
registerPollyPreoptPasses);

10
polly/www/example_load_Polly_into_clang.html
View File

@@ -59,6 +59,16 @@ Automatic vector code generation can be enabled by adding <b>-mllvm
<pre class="code">pollycc -O3 -mllvm -enable-polly-vector file.c</pre>
<h2>Extract a preoptimized LLVM-IR file</h2>
Often it is useful to derive from a C-file the LLVM-IR code that is actually
optimized by Polly. Normally the LLVM-IR is automatically generated from
the C code by first lowering C to LLVM-IR (clang) and by subsequently applying a
set of preparing transformations on the LLVM-IR. To get the LLVM-IR after the
preparing transformations have been applied run Polly with '-O0'.
<pre class="code">pollycc -O0 -mllvm -polly -S -emit-llvm file.c</pre>
<h2>Further options</h2>
Polly supports further options that are mainly useful for the development or