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ARM: support PIC on Windows on ARM

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Handle lowering of global addresses for PIC mode compilation on Windows.  Always
use the movw/movt load to load the address as Windows on ARM requires ARMv7+ and
is a pure Thumb environment.

llvm-svn: 208385
This commit is contained in:
Saleem Abdulrasool 2014-05-09 00:58:32 +00:00
parent c1cba63526
commit 17218ea0a8
3 changed files with 43 additions and 2 deletions
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28
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -2485,6 +2485,23 @@ SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
return Result;
}
SDValue ARMTargetLowering::LowerGlobalAddressWindows(SDValue Op,
SelectionDAG &DAG) const {
assert(Subtarget->isTargetWindows() && "non-Windows COFF is not supported");
assert(Subtarget->useMovt() && "Windows on ARM expects to use movw/movt");
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
EVT PtrVT = getPointerTy();
SDLoc DL(Op);
++NumMovwMovt;
// FIXME: Once remat is capable of dealing with instructions with register
// operands, expand this into two nodes.
return DAG.getNode(ARMISD::Wrapper, DL, PtrVT,
DAG.getTargetGlobalAddress(GV, DL, PtrVT));
}
SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
SelectionDAG &DAG) const {
assert(Subtarget->isTargetELF() &&
@ -6050,8 +6067,15 @@ SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::GlobalAddress:
return Subtarget->isTargetMachO() ? LowerGlobalAddressDarwin(Op, DAG) :
LowerGlobalAddressELF(Op, DAG);
switch (Subtarget->getTargetTriple().getObjectFormat()) {
default: llvm_unreachable("unknown object format");
case Triple::COFF:
return LowerGlobalAddressWindows(Op, DAG);
case Triple::ELF:
return LowerGlobalAddressELF(Op, DAG);
case Triple::MachO:
return LowerGlobalAddressDarwin(Op, DAG);
}
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::SELECT: return LowerSELECT(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);

1
lib/Target/ARM/ARMISelLowering.h
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@ -437,6 +437,7 @@ namespace llvm {
SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddressWindows(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
SelectionDAG &DAG) const;

16
test/CodeGen/ARM/Windows/pic.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llc -mtriple thumbv7-windows-itanium -relocation-model pic -filetype asm -o - %s \
; RUN: | FileCheck %s
@external = external global i8
define arm_aapcs_vfpcc i8 @return_external() {
entry:
%0 = load i8* @external, align 1
ret i8 %0
}
; CHECK-LABEL: return_external
; CHECK: movw r0, :lower16:external
; CHECK: movt r0, :upper16:external
; CHECK: ldrb r0, [r0]