Revert r85346 change to control tail merging by CodeGenOpt::Level.

I'm going to redo this using the OptimizeForSize function attribute.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85426 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 9 deletions

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 11777d5ea1..66c5aa5ff7 100644
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -50,9 +50,8 @@ TailMergeThreshold("tail-merge-threshold",
 
 char BranchFolderPass::ID = 0;
 
-FunctionPass *llvm::createBranchFoldingPass(bool DefaultEnableTailMerge,
-                                            CodeGenOpt::Level OptLevel) { 
-  return new BranchFolderPass(DefaultEnableTailMerge, OptLevel);
+FunctionPass *llvm::createBranchFoldingPass(bool DefaultEnableTailMerge) { 
+  return new BranchFolderPass(DefaultEnableTailMerge);
 }
 
 bool BranchFolderPass::runOnMachineFunction(MachineFunction &MF) {
@@ -64,8 +63,7 @@ bool BranchFolderPass::runOnMachineFunction(MachineFunction &MF) {
 
 
 
-BranchFolder::BranchFolder(bool defaultEnableTailMerge, CodeGenOpt::Level OL) {
-  OptLevel = OL;
+BranchFolder::BranchFolder(bool defaultEnableTailMerge) {
   switch (FlagEnableTailMerge) {
   case cl::BOU_UNSET: EnableTailMerge = defaultEnableTailMerge; break;
   case cl::BOU_TRUE: EnableTailMerge = true; break;
@@ -472,8 +470,7 @@ unsigned BranchFolder::ComputeSameTails(unsigned CurHash,
                                         I->second,
                                         TrialBBI1, TrialBBI2);
       // If we will have to split a block, there should be at least
-      // minCommonTailLength instructions in common; if not, and if we are not
-      // optimizing for performance at the expense of code size, at worst
+      // minCommonTailLength instructions in common; if not, at worst
       // we will be replacing a fallthrough into the common tail with a
       // branch, which at worst breaks even with falling through into
       // the duplicated common tail, so 1 instruction in common is enough.
@@ -481,8 +478,7 @@ unsigned BranchFolder::ComputeSameTails(unsigned CurHash,
       // tail if there is one.
       // (Empty blocks will get forwarded and need not be considered.)
       if (CommonTailLen >= minCommonTailLength ||
-          (OptLevel != CodeGenOpt::Aggressive &&
-           CommonTailLen > 0 &&
+          (CommonTailLen > 0 &&
            (TrialBBI1==CurMPIter->second->begin() ||
             TrialBBI2==I->second->begin()))) {
         if (CommonTailLen > maxCommonTailLength) {