TLS support for MinGW targets.
MinGW is almost completely compatible to MSVC, with the exception of the _tls_array global not being available.
Patch by David Nadlinger!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177257 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index b80b899..10cf13f 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -7834,7 +7834,7 @@
Chain.getValue(1));
}
- if (Subtarget->isTargetWindows()) {
+ if (Subtarget->isTargetWindows() || Subtarget->isTargetMingw()) {
// Just use the implicit TLS architecture
// Need to generate someting similar to:
// mov rdx, qword [gs:abs 58H]; Load pointer to ThreadLocalStorage
@@ -7854,18 +7854,19 @@
SDValue Chain = DAG.getEntryNode();
// Get the Thread Pointer, which is %fs:__tls_array (32-bit) or
- // %gs:0x58 (64-bit).
+ // %gs:0x58 (64-bit). On MinGW, __tls_array is not available, so directly
+ // use its literal value of 0x2C.
Value *Ptr = Constant::getNullValue(Subtarget->is64Bit()
? Type::getInt8PtrTy(*DAG.getContext(),
256)
: Type::getInt32PtrTy(*DAG.getContext(),
257));
- SDValue ThreadPointer = DAG.getLoad(getPointerTy(), dl, Chain,
- Subtarget->is64Bit()
- ? DAG.getIntPtrConstant(0x58)
- : DAG.getExternalSymbol("_tls_array",
- getPointerTy()),
+ SDValue TlsArray = Subtarget->is64Bit() ? DAG.getIntPtrConstant(0x58) :
+ (Subtarget->isTargetMingw() ? DAG.getIntPtrConstant(0x2C) :
+ DAG.getExternalSymbol("_tls_array", getPointerTy()));
+
+ SDValue ThreadPointer = DAG.getLoad(getPointerTy(), dl, Chain, TlsArray,
MachinePointerInfo(Ptr),
false, false, false, 0);
