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TLS support for MinGW targets.

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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
This commit is contained in:
Anton Korobeynikov 2013-03-18 08:12:28 +00:00
parent 87294b6547
commit 2ee4e428cc
1 changed files with 8 additions and 7 deletions
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15
lib/Target/X86/X86ISelLowering.cpp
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@ -7834,7 +7834,7 @@ X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
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 @@ X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
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);