[ARM] Pass a callback to FunctionPass constructors to enable skipping execution

on a per-function basis.

Previously some of the passes were conditionally added to ARM's pass pipeline
based on the target machine's subtarget. This patch makes changes to add those
passes unconditionally and execute them conditonally based on the predicate
functor passed to the pass constructors. This enables running different sets of
passes for different functions in the module.

rdar://problem/20542263

Differential Revision: http://reviews.llvm.org/D8717

llvm-svn: 239325

1 files changed, 12 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
index 0d59c72cb8f..e861ceb2a66 100644
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -170,9 +170,12 @@ namespace {
     bool PreRegAlloc;
     bool MadeChange;
     int FnNum;
+    std::function<bool(const Function &)> PredicateFtor;
+
   public:
     static char ID;
-    IfConverter() : MachineFunctionPass(ID), FnNum(-1) {
+    IfConverter(std::function<bool(const Function &)> Ftor = nullptr)
+        : MachineFunctionPass(ID), FnNum(-1), PredicateFtor(Ftor) {
       initializeIfConverterPass(*PassRegistry::getPassRegistry());
     }
 
@@ -270,6 +273,9 @@ INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
 INITIALIZE_PASS_END(IfConverter, "if-converter", "If Converter", false, false)
 
 bool IfConverter::runOnMachineFunction(MachineFunction &MF) {
+  if (PredicateFtor && !PredicateFtor(*MF.getFunction()))
+    return false;
+
   const TargetSubtargetInfo &ST = MF.getSubtarget();
   TLI = ST.getTargetLowering();
   TII = ST.getInstrInfo();
@@ -1691,3 +1697,8 @@ void IfConverter::MergeBlocks(BBInfo &ToBBI, BBInfo &FromBBI, bool AddEdges) {
   ToBBI.IsAnalyzed = false;
   FromBBI.IsAnalyzed = false;
 }
+
+FunctionPass *
+llvm::createIfConverter(std::function<bool(const Function &)> Ftor) {
+  return new IfConverter(Ftor);
+}