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AArch64: implement support for blockaddress in large code model

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llvm-svn: 181118
This commit is contained in:
Tim Northover 2013-05-04 16:53:53 +00:00
parent 87645e02c0
commit ece66eacb2
2 changed files with 29 additions and 11 deletions
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31
lib/Target/AArch64/AArch64ISelLowering.cpp
View File

@ -1667,17 +1667,26 @@ AArch64TargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
EVT PtrVT = getPointerTy();
const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
assert(getTargetMachine().getCodeModel() == CodeModel::Small
&& "Only small code model supported at the moment");
// The most efficient code is PC-relative anyway for the small memory model,
// so we don't need to worry about relocation model.
return DAG.getNode(AArch64ISD::WrapperSmall, DL, PtrVT,
DAG.getTargetBlockAddress(BA, PtrVT, 0,
AArch64II::MO_NO_FLAG),
DAG.getTargetBlockAddress(BA, PtrVT, 0,
AArch64II::MO_LO12),
DAG.getConstant(/*Alignment=*/ 4, MVT::i32));
switch(getTargetMachine().getCodeModel()) {
case CodeModel::Small:
// The most efficient code is PC-relative anyway for the small memory model,
// so we don't need to worry about relocation model.
return DAG.getNode(AArch64ISD::WrapperSmall, DL, PtrVT,
DAG.getTargetBlockAddress(BA, PtrVT, 0,
AArch64II::MO_NO_FLAG),
DAG.getTargetBlockAddress(BA, PtrVT, 0,
AArch64II::MO_LO12),
DAG.getConstant(/*Alignment=*/ 4, MVT::i32));
case CodeModel::Large:
return DAG.getNode(
AArch64ISD::WrapperLarge, DL, PtrVT,
DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_ABS_G3),
DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_ABS_G2_NC),
DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_ABS_G1_NC),
DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_ABS_G0_NC));
default:
llvm_unreachable("Only small and large code models supported now");
}
}

9
test/CodeGen/AArch64/blockaddress.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s
; RUN: llc -code-model=large -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck --check-prefix=CHECK-LARGE %s
@addr = global i8* null
@ -13,6 +14,14 @@ define void @test_blockaddress() {
; CHECK: ldr [[NEWDEST:x[0-9]+]]
; CHECK: br [[NEWDEST]]
; CHECK-LARGE: movz [[ADDR_REG:x[0-9]+]], #:abs_g3:[[DEST_LBL:.Ltmp[0-9]+]]
; CHECK-LARGE: movk [[ADDR_REG]], #:abs_g2_nc:[[DEST_LBL]]
; CHECK-LARGE: movk [[ADDR_REG]], #:abs_g1_nc:[[DEST_LBL]]
; CHECK-LARGE: movk [[ADDR_REG]], #:abs_g0_nc:[[DEST_LBL]]
; CHECK-LARGE: str [[ADDR_REG]],
; CHECK-LARGE: ldr [[NEWDEST:x[0-9]+]]
; CHECK-LARGE: br [[NEWDEST]]
block:
ret void
}