Add optimize-for-size knob.

llvm-svn: 48793

2 files changed, 10 insertions, 0 deletions

diff --git a/llvm/include/llvm/Target/TargetOptions.h b/llvm/include/llvm/Target/TargetOptions.h
index 554a32b9d9f..72bb272015a 100644
--- a/llvm/include/llvm/Target/TargetOptions.h
+++ b/llvm/include/llvm/Target/TargetOptions.h
@@ -78,6 +78,10 @@ namespace llvm {
   /// on the commandline. When the flag is on, the target will perform tail call
   /// optimization (pop the caller's stack) providing it supports it.
   extern bool PerformTailCallOpt;
+
+  /// OptimizeForSize - When this flags is set, code generator avoids optimization
+  /// that increases size.
+  extern bool OptimizeForSize;
 } // End llvm namespace
 
 #endif
diff --git a/llvm/lib/Target/TargetMachine.cpp b/llvm/lib/Target/TargetMachine.cpp
index 15164ca28df..b9a68789ab5 100644
--- a/llvm/lib/Target/TargetMachine.cpp
+++ b/llvm/lib/Target/TargetMachine.cpp
@@ -34,6 +34,7 @@ namespace llvm {
   Reloc::Model RelocationModel;
   CodeModel::Model CMModel;
   bool PerformTailCallOpt;
+  bool OptimizeForSize;
 }
 namespace {
   cl::opt<bool, true> PrintCode("print-machineinstrs",
@@ -123,6 +124,11 @@ namespace {
                            cl::desc("Turn on tail call optimization."),
                            cl::location(PerformTailCallOpt),
                            cl::init(false));
+  cl::opt<bool, true>
+  EnableOptimizeForSize("optimizeforsize",
+                        cl::desc("Optimize for size."),
+                           cl::location(OptimizeForSize),
+                           cl::init(false));
 }
 
 //---------------------------------------------------------------------------