From 3464cec4d8cf09f9e1b3b9af9ab7b7d4a6a69a59 Mon Sep 17 00:00:00 2001
From: "Michael J. Spencer" <bigcheesegs@gmail.com>
Date: Mon, 23 Aug 2010 04:45:37 +0000
Subject: [PATCH] Workaround broken jump tables on x86-64 COFF.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111792 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCAsmInfoCOFF.cpp           | 1 +
 lib/Target/X86/X86ISelLowering.cpp | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/lib/MC/MCAsmInfoCOFF.cpp b/lib/MC/MCAsmInfoCOFF.cpp
index 7fc7d7abb23..45e981b9fcb 100644
--- a/lib/MC/MCAsmInfoCOFF.cpp
+++ b/lib/MC/MCAsmInfoCOFF.cpp
@@ -20,6 +20,7 @@ MCAsmInfoCOFF::MCAsmInfoCOFF() {
   GlobalPrefix = "_";
   COMMDirectiveAlignmentIsInBytes = false;
   HasLCOMMDirective = true;
+  HasSetDirective = false;
   HasDotTypeDotSizeDirective = false;
   HasSingleParameterDotFile = false;
   PrivateGlobalPrefix = "L";  // Prefix for private global symbols
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index a2e2806c2e6..9b0c5297e44 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1029,6 +1029,12 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
   maxStoresPerMemmove = 3; // For @llvm.memmove -> sequence of stores
   setPrefLoopAlignment(16);
   benefitFromCodePlacementOpt = true;
+
+  // FIXME: Jump tables are currently broken for 64 bit COFF.
+  // See PR7960.
+  if (Subtarget->is64Bit() && Subtarget->isTargetCOFF()) {
+    DisableJumpTables = true;
+  }
 }