commit 8bc3434e68028263c42dd26bde3c16450cb146f4
author Chandler Carruth <chandlerc@gmail.com> Wed May 16 08:32:49 2012 +0000
committer Chandler Carruth <chandlerc@gmail.com> Wed May 16 08:32:49 2012 +0000
tree 5c216ef9b65b1c32c440350e1ebae19c8230f737
parent 04b2c5042727b091ad425110d952491a40c88ee3

Teach the 'opt' tool about '-Os' and '-Oz', corresponding to the Clang
options, to enable easier testing of the innards of LLVM that are
enabled by such optimization strategies.

Note that this doesn't provide the (much needed) function attribute
support for -Oz (as opposed to -Os), but still seems like a positive
step to better test the logic that Clang currently relies on.

Patch by Patrik Hägglund.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156913 91177308-0d34-0410-b5e6-96231b3b80d8

tools/opt/opt.cpp

diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index a5b0511..d9758b3 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -104,15 +104,23 @@
 
 static cl::opt<bool>
 OptLevelO1("O1",
-           cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
+           cl::desc("Optimization level 1. Similar to clang -O1"));
 
 static cl::opt<bool>
 OptLevelO2("O2",
-           cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
+           cl::desc("Optimization level 2. Similar to clang -O2"));
+
+static cl::opt<bool>
+OptLevelOs("Os",
+           cl::desc("Like -O2 with extra optimizations for size. Similar to clang -Os"));
+
+static cl::opt<bool>
+OptLevelOz("Oz",
+           cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
 
 static cl::opt<bool>
 OptLevelO3("O3",
-           cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
+           cl::desc("Optimization level 3. Similar to clang -O3"));
 
 static cl::opt<std::string>
 TargetTriple("mtriple", cl::desc("Override target triple for module"));
@@ -409,16 +417,21 @@
 ///
 /// OptLevel - Optimization Level
 static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
-                                  unsigned OptLevel) {
+                                  unsigned OptLevel, unsigned SizeLevel) {
   FPM.add(createVerifierPass());                  // Verify that input is correct
 
   PassManagerBuilder Builder;
   Builder.OptLevel = OptLevel;
+  Builder.SizeLevel = SizeLevel;
 
   if (DisableInline) {
     // No inlining pass
   } else if (OptLevel > 1) {
     unsigned Threshold = 225;
+    if (SizeLevel == 1)      // -Os
+      Threshold = 75;
+    else if (SizeLevel == 2) // -Oz
+      Threshold = 25;
     if (OptLevel > 2)
       Threshold = 275;
     Builder.Inliner = createFunctionInliningPass(Threshold);
@@ -571,7 +584,7 @@
     Passes.add(TD);
 
   OwningPtr<FunctionPassManager> FPasses;
-  if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
+  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
     FPasses.reset(new FunctionPassManager(M.get()));
     if (TD)
       FPasses->add(new TargetData(*TD));
@@ -617,17 +630,27 @@
     }
 
     if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
-      AddOptimizationPasses(Passes, *FPasses, 1);
+      AddOptimizationPasses(Passes, *FPasses, 1, 0);
       OptLevelO1 = false;
     }
 
     if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
-      AddOptimizationPasses(Passes, *FPasses, 2);
+      AddOptimizationPasses(Passes, *FPasses, 2, 0);
       OptLevelO2 = false;
     }
 
+    if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
+      AddOptimizationPasses(Passes, *FPasses, 2, 1);
+      OptLevelOs = false;
+    }
+
+    if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
+      AddOptimizationPasses(Passes, *FPasses, 2, 2);
+      OptLevelOz = false;
+    }
+
     if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
-      AddOptimizationPasses(Passes, *FPasses, 3);
+      AddOptimizationPasses(Passes, *FPasses, 3, 0);
       OptLevelO3 = false;
     }
 
@@ -682,15 +705,21 @@
   }
 
   if (OptLevelO1)
-    AddOptimizationPasses(Passes, *FPasses, 1);
+    AddOptimizationPasses(Passes, *FPasses, 1, 0);
 
   if (OptLevelO2)
-    AddOptimizationPasses(Passes, *FPasses, 2);
+    AddOptimizationPasses(Passes, *FPasses, 2, 0);
+
+  if (OptLevelOs)
+    AddOptimizationPasses(Passes, *FPasses, 2, 1);
+
+  if (OptLevelOz)
+    AddOptimizationPasses(Passes, *FPasses, 2, 2);
 
   if (OptLevelO3)
-    AddOptimizationPasses(Passes, *FPasses, 3);
+    AddOptimizationPasses(Passes, *FPasses, 3, 0);
 
-  if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
+  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
     FPasses->doInitialization();
     for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
       FPasses->run(*F);