From e98ad835435b82347eac3708e561928a35c62865 Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Thu, 17 Jun 2010 00:51:48 +0000
Subject: [PATCH] Hack to let the move lowering handle dynamic-no-pic absolute
 moves of TLVP:

movl _a@TLVP, %eax

Daniel: Please review if you get a chance.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106194 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/AsmPrinter/X86MCInstLower.cpp | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
index a97517b0da0..43c654e1487 100644
--- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
+++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
@@ -277,10 +277,21 @@ static void SimplifyShortMoveForm(MCInst &Inst, unsigned Opcode) {
     return;
 
   // Check whether this is an absolute address.
-  if (Inst.getOperand(AddrBase + 0).getReg() != 0 ||
-      Inst.getOperand(AddrBase + 2).getReg() != 0 ||
-      Inst.getOperand(AddrBase + 4).getReg() != 0 ||
-      Inst.getOperand(AddrBase + 1).getImm() != 1)
+  // FIXME: We know TLVP symbol refs aren't, but there should be a better way 
+  // to do this here.
+  bool Absolute = true;
+  if (Inst.getOperand(AddrOp).isExpr()) {
+    const MCExpr *MCE = Inst.getOperand(AddrOp).getExpr();
+    if (const MCSymbolRefExpr *SRE = dyn_cast<MCSymbolRefExpr>(MCE))
+      if (SRE->getKind() == MCSymbolRefExpr::VK_TLVP)
+        Absolute = false;
+  }
+  
+  if (Absolute &&
+      (Inst.getOperand(AddrBase + 0).getReg() != 0 ||
+       Inst.getOperand(AddrBase + 2).getReg() != 0 ||
+       Inst.getOperand(AddrBase + 4).getReg() != 0 ||
+       Inst.getOperand(AddrBase + 1).getImm() != 1))
     return;
 
   // If so, rewrite the instruction.