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AArch64: support large code model for jump-tables

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181119 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2013-05-04 16:54:00 +00:00
parent b2efdde06c
commit cd1b09b25b
2 changed files with 26 additions and 5 deletions
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23
lib/Target/AArch64/AArch64ISelLowering.cpp
View File

@ -2133,14 +2133,27 @@ SDValue
AArch64TargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
DebugLoc dl = JT->getDebugLoc();
EVT PtrVT = getPointerTy();
// When compiling PIC, jump tables get put in the code section so a static
// relocation-style is acceptable for both cases.
return DAG.getNode(AArch64ISD::WrapperSmall, dl, getPointerTy(),
DAG.getTargetJumpTable(JT->getIndex(), getPointerTy()),
DAG.getTargetJumpTable(JT->getIndex(), getPointerTy(),
AArch64II::MO_LO12),
DAG.getConstant(1, MVT::i32));
switch (getTargetMachine().getCodeModel()) {
case CodeModel::Small:
return DAG.getNode(AArch64ISD::WrapperSmall, dl, PtrVT,
DAG.getTargetJumpTable(JT->getIndex(), PtrVT),
DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
AArch64II::MO_LO12),
DAG.getConstant(1, MVT::i32));
case CodeModel::Large:
return DAG.getNode(
AArch64ISD::WrapperLarge, dl, PtrVT,
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_ABS_G3),
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_ABS_G2_NC),
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_ABS_G1_NC),
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_ABS_G0_NC));
default:
llvm_unreachable("Only small and large code models supported now");
}
}
// (SELECT_CC lhs, rhs, iftrue, iffalse, condcode)

8
test/CodeGen/AArch64/jump-table.ll
View File

@ -1,4 +1,5 @@
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck %s
; RUN: llc -code-model=large -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu | FileCheck --check-prefix=CHECK-LARGE %s
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-none-linux-gnu -filetype=obj | llvm-readobj -r | FileCheck %s -check-prefix=CHECK-ELF
define i32 @test_jumptable(i32 %in) {
@ -15,6 +16,13 @@ define i32 @test_jumptable(i32 %in) {
; CHECK: ldr [[DEST:x[0-9]+]], [x[[JT]], {{x[0-9]+}}, lsl #3]
; CHECK: br [[DEST]]
; CHECK-LARGE: movz x[[JTADDR:[0-9]+]], #:abs_g3:.LJTI0_0
; CHECK-LARGE: movk x[[JTADDR]], #:abs_g2_nc:.LJTI0_0
; CHECK-LARGE: movk x[[JTADDR]], #:abs_g1_nc:.LJTI0_0
; CHECK-LARGE: movk x[[JTADDR]], #:abs_g0_nc:.LJTI0_0
; CHECK-LARGE: ldr [[DEST:x[0-9]+]], [x[[JTADDR]], {{x[0-9]+}}, lsl #3]
; CHECK-LARGE: br [[DEST]]
def:
ret i32 0