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Implement another D-specific pass: -dgc2stack

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This one promotes GC allocations to stack memory when it can determine it's safe
to do so.
Not all GC calls are recognized yet (in fact only one *is* recognized for now).
Needs metadata, so disabled for LLVM versions that don't support it.
This commit is contained in:
Frits van Bommel 2009-05-02 11:58:50 +02:00
parent a9c518d82b
commit cff0f1f446
3 changed files with 252 additions and 5 deletions
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28
gen/optimizer.cpp
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@ -45,6 +45,11 @@ disableSimplifyRuntimeCalls("disable-simplify-drtcalls",
cl::desc("Disable simplification of runtime calls in -O<N>"),
cl::ZeroOrMore);
static cl::opt<bool>
disableGCToStack("disable-gc2stack",
cl::desc("Disable promotion of GC allocations to stack memory in -O<N>"),
cl::ZeroOrMore);
static cl::opt<opts::BoolOrDefaultAdapter, false, opts::FlagParser>
enableInlining("inlining",
cl::desc("(*) Enable function inlining in -O<N>"),
@ -93,6 +98,8 @@ static void addPassesForOptLevel(PassManager& pm) {
pm.add(createInstructionCombiningPass());
pm.add(createCFGSimplificationPass());
pm.add(createPruneEHPass());
if (!disableLangSpecificPasses && !disableGCToStack)
pm.add(createGarbageCollect2Stack());
}
// -inline
@ -101,8 +108,10 @@ static void addPassesForOptLevel(PassManager& pm) {
if (optimizeLevel >= 2) {
// Run some optimizations to clean up after inlining.
pm.add(createInstructionCombiningPass());
pm.add(createScalarReplAggregatesPass());
pm.add(createInstructionCombiningPass());
if (!disableLangSpecificPasses && !disableGCToStack)
pm.add(createGarbageCollect2Stack());
// Inline again, to catch things like foreach delegates
// passed to inlined opApply's where the function wasn't
@ -110,14 +119,23 @@ static void addPassesForOptLevel(PassManager& pm) {
pm.add(createFunctionInliningPass());
// Run clean-up again.
pm.add(createInstructionCombiningPass());
pm.add(createScalarReplAggregatesPass());
pm.add(createInstructionCombiningPass());
if (!disableLangSpecificPasses && !disableGCToStack)
pm.add(createGarbageCollect2Stack());
}
}
if (optimizeLevel >= 2 && !disableLangSpecificPasses
&& !disableSimplifyRuntimeCalls) {
pm.add(createSimplifyDRuntimeCalls());
if (optimizeLevel >= 2 && !disableLangSpecificPasses) {
if (!disableSimplifyRuntimeCalls)
pm.add(createSimplifyDRuntimeCalls());
if (!disableGCToStack) {
// Run some clean-up after the last GC to stack promotion pass.
pm.add(createScalarReplAggregatesPass());
pm.add(createInstructionCombiningPass());
pm.add(createCFGSimplificationPass());
}
}
// -O3