PR10991: make fast-isel correctly check whether accessing a global through an alias involves thread-local storage. (I'm not entirely sure how this is supposed to work, but this patch makes fast-isel consistent with the normal isel path.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140355 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 457b742..aafa963 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -22,6 +22,7 @@
#include "llvm/CallingConv.h"
#include "llvm/DerivedTypes.h"
#include "llvm/GlobalVariable.h"
+#include "llvm/GlobalAlias.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Operator.h"
@@ -467,14 +468,23 @@
// Handle constant address.
if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
- // Can't handle alternate code models or TLS yet.
+ // Can't handle alternate code models yet.
if (TM.getCodeModel() != CodeModel::Small)
return false;
+ // Can't handle TLS yet.
if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
if (GVar->isThreadLocal())
return false;
+ // Can't handle TLS yet, part 2 (this is slightly crazy, but this is how
+ // it works...).
+ if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
+ if (const GlobalVariable *GVar =
+ dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false)))
+ if (GVar->isThreadLocal())
+ return false;
+
// RIP-relative addresses can't have additional register operands, so if
// we've already folded stuff into the addressing mode, just force the
// global value into its own register, which we can use as the basereg.