From bcdc0477319a26fd8dcdde5ace3bdd6743599f44 Mon Sep 17 00:00:00 2001
From: spupyrev <spupyrev@fb.com>
Date: Tue, 1 Mar 2022 15:05:44 -0800
Subject: speeding up ext-tsp for huge instances

Differential Revision: https://reviews.llvm.org/D120780
---
 llvm/lib/CodeGen/MachineBlockPlacement.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/MachineBlockPlacement.cpp')

diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 5ad3d4d21ce2..e4534ddad103 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -201,6 +201,7 @@ static cl::opt<unsigned> TriangleChainCount(
     cl::Hidden);
 
 extern cl::opt<bool> EnableExtTspBlockPlacement;
+extern cl::opt<bool> ApplyExtTspWithoutProfile;
 
 namespace llvm {
 extern cl::opt<unsigned> StaticLikelyProb;
@@ -3419,7 +3420,8 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &MF) {
   }
 
   // Apply a post-processing optimizing block placement.
-  if (MF.size() >= 3 && EnableExtTspBlockPlacement) {
+  if (MF.size() >= 3 && EnableExtTspBlockPlacement &&
+      (ApplyExtTspWithoutProfile || MF.getFunction().hasProfileData())) {
     // Find a new placement and modify the layout of the blocks in the function.
     applyExtTsp();
 
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