From 67787997cf786697622555b9d9a634b1ba8aac0b Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Tue, 4 Feb 2020 10:51:48 +0000
Subject: [PATCH] [DAG] OptLevelChanger - fix uninitialized variable analyzer
 warning (PR44471)

Ensure that OptLevelChanger::SavedFastISel is initialized in the constructor.

This should be NFC - as the equivalent 'same opt level' early-out is used in the destructor as well, so SavedFastISel is only actually referenced in the general case.

Differential Revision: https://reviews.llvm.org/D73875
---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 6c57c72d47a..b83c9026427 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -215,6 +215,7 @@ namespace llvm {
     OptLevelChanger(SelectionDAGISel &ISel,
                     CodeGenOpt::Level NewOptLevel) : IS(ISel) {
       SavedOptLevel = IS.OptLevel;
+      SavedFastISel = IS.TM.Options.EnableFastISel;
       if (NewOptLevel == SavedOptLevel)
         return;
       IS.OptLevel = NewOptLevel;
@@ -223,7 +224,6 @@ namespace llvm {
                         << IS.MF->getFunction().getName() << "\n");
       LLVM_DEBUG(dbgs() << "\tBefore: -O" << SavedOptLevel << " ; After: -O"
                         << NewOptLevel << "\n");
-      SavedFastISel = IS.TM.Options.EnableFastISel;
       if (NewOptLevel == CodeGenOpt::None) {
         IS.TM.setFastISel(IS.TM.getO0WantsFastISel());
         LLVM_DEBUG(