From 874c92bd47797c7b7ba4dc46b8d7c6d6bf477972 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 15 Jun 2010 19:08:40 +0000
Subject: [PATCH] fix fastisel to handle GS and FS relative pointers.  Patch by
 Nelson Elhage!

llvm-svn: 106031
---
 llvm/lib/Target/X86/X86FastISel.cpp                   | 5 +++++
 llvm/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll | 6 ++++++
 2 files changed, 11 insertions(+)
 create mode 100644 llvm/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll

diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index 47ee820b2860..553e9b116aa2 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -349,6 +349,11 @@ bool X86FastISel::X86SelectAddress(const Value *V, X86AddressMode &AM) {
     U = C;
   }
 
+  if (const PointerType *Ty = dyn_cast<PointerType>(V->getType()))
+    if (Ty->getAddressSpace() > 255)
+      // Fast instruction selection doesn't support pointers through %fs or %gs
+      return false;
+
   switch (Opcode) {
   default: break;
   case Instruction::BitCast:
diff --git a/llvm/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll b/llvm/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll
new file mode 100644
index 000000000000..b22a391ef358
--- /dev/null
+++ b/llvm/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll
@@ -0,0 +1,6 @@
+; RUN: llc -fast-isel -march=x86 < %s | grep %fs:
+
+define i32 @test1(i32 addrspace(257)* %arg) nounwind {
+       %tmp = load i32 addrspace(257)* %arg
+       ret i32 %tmp
+}