Fast-isel can't do TLS yet, so it should fall back to SDISel

if it sees TLS addresses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65341 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86FastISel.cpp

@@ -21,6 +21,7 @@
 #include "X86TargetMachine.h"
 #include "llvm/CallingConv.h"
 #include "llvm/DerivedTypes.h"
+#include "llvm/GlobalVariable.h"
 #include "llvm/Instructions.h"
 #include "llvm/Intrinsics.h"
 #include "llvm/CodeGen/FastISel.h"
@@ -433,6 +434,11 @@ bool X86FastISel::X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall) {
         (AM.Base.Reg != 0 || AM.IndexReg != 0))
       return false;
 
+    // Can't handle TLS yet.
+    if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
+      if (GVar->isThreadLocal())
+        return false;
+
     // Set up the basic address.
     AM.GV = GV;
     if (!isCall &&

test/CodeGen/X86/fast-isel-tls.ll

@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=x86 -relocation-model=pic -mtriple=i686-unknown-linux-gnu -fast-isel | grep __tls_get_addr
+; PR3654
+
+@v = thread_local global i32 0
+define i32 @f() nounwind {
+entry:
+          %t = load i32* @v
+          %s = add i32 %t, 1
+          ret i32 %s
+}