From: Chris Lattner <sabre@nondot.org>
Date: Tue, 15 Jun 2010 19:08:40 +0000 (+0000)
Subject: fix fastisel to handle GS and FS relative pointers.  Patch by
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=868ee9460c6e3055162f7ed9b05747606096945a;p=oota-llvm.git

fix fastisel to handle GS and FS relative pointers.  Patch by
Nelson Elhage!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106031 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 47ee820b286..553e9b116aa 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/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/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll b/test/CodeGen/X86/2010-06-14-fast-isel-fs-load.ll
new file mode 100644
index 00000000000..b22a391ef35
--- /dev/null
+++ b/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
+}