Revert of commit 51f5fdc

Change-Id: Icf1835b52f0e18683a75b5d379d9fe4ae1edf790

Author: paigeale

IGC/Compiler/GenTTI.cpp

@@ -222,14 +222,6 @@ namespace llvm {
                     }
                     return Total - PHIs;
                 };
-                auto countIntegerOperations = [](BasicBlock* BB) {
-                    unsigned Int_Instructions = 0;
-                    for (auto BI = BB->begin(), BE = BB->end(); BI != BE; ++BI) {
-                        if (isa<IntegerType>((&*BI)->getType()))
-                            ++Int_Instructions;
-                    }
-                    return Int_Instructions;
-                };
                 auto hasLoad = [](BasicBlock* BB) {
                     for (auto BI = BB->begin(), BE = BB->end(); BI != BE; ++BI)
                         if (isa<LoadInst>(&*BI))
@@ -251,13 +243,11 @@ namespace llvm {
                 };
                 // For innermost loop, allow certain patterns.
                 unsigned Count = 0;
-                unsigned Int_Count = 0;
                 bool HasCall = false;
                 bool HasStore = false;
                 bool MayHasLoadInHeaderOnly = true;
                 for (auto BI = L->block_begin(), BE = L->block_end(); BI != BE; ++BI) {
                     Count += countNonPHI(*BI);
-                    Int_Count += countIntegerOperations(*BI);
                     HasCall |= hasCall(*BI);
                     HasStore |= hasStore(*BI);
                     if (L->getHeader() != *BI)
@@ -273,15 +263,6 @@ namespace llvm {
                     // The following is only available and required from LLVM 3.7+.
                     UP.AllowExpensiveTripCount = true;
                 }
-                //Controls stack size growth being too big to compile. When we get into SCEV
-                //and start processing the i32 instructions we can get too deep in the call stack
-                //that we cause a stack overflow during compilation.
-                unsigned Total_Potential_Inst = TripCount * Int_Count;
-                if (Total_Potential_Inst > 2700)
-                {
-                    UP.Threshold = 2000;
-                    UP.PartialThreshold = 2000;
-                }
             }
             return;
         }