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Add jump tables handling for MSP430.

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Patch by Job Noorman!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2013-07-01 19:44:44 +00:00
parent 03fae50cfa
commit 27253f5edd
3 changed files with 65 additions and 0 deletions
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10
lib/Target/MSP430/MSP430ISelLowering.cpp
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@ -169,6 +169,7 @@ MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) :
setOperationAction(ISD::VAARG, MVT::Other, Expand);
setOperationAction(ISD::VAEND, MVT::Other, Expand);
setOperationAction(ISD::VACOPY, MVT::Other, Expand);
setOperationAction(ISD::JumpTable, MVT::i16, Custom);
// Libcalls names.
if (HWMultMode == HWMultIntr) {
@ -199,6 +200,7 @@ SDValue MSP430TargetLowering::LowerOperation(SDValue Op,
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
default:
llvm_unreachable("unimplemented operand");
}
@ -981,6 +983,14 @@ SDValue MSP430TargetLowering::LowerVASTART(SDValue Op,
false, false, 0);
}
SDValue MSP430TargetLowering::LowerJumpTable(SDValue Op,
SelectionDAG &DAG) const {
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy());
Result.getNode()->setDebugLoc(JT->getDebugLoc());
return Result;
}
/// getPostIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if this node can be
/// combined with a load / store to form a post-indexed load / store.

1
lib/Target/MSP430/MSP430ISelLowering.h
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@ -93,6 +93,7 @@ namespace llvm {
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
TargetLowering::ConstraintType

54
test/CodeGen/MSP430/jumptable.ll Normal file
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@ -0,0 +1,54 @@
; RUN: llc -O0 < %s | FileCheck %s
target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16"
target triple = "msp430---elf"
; Function Attrs: nounwind
define i16 @test(i16 %i) #0 {
entry:
; CHECK: test:
%retval = alloca i16, align 2
%i.addr = alloca i16, align 2
store i16 %i, i16* %i.addr, align 2
%0 = load i16* %i.addr, align 2
; CHECK: add.w #.LJTI0_0, [[REG1:r[0-9]+]]
; CHECK: mov.w 0([[REG1]]), [[REG2:r[0-9]+]]
; CHECK: br [[REG2]]
switch i16 %0, label %sw.default [
i16 0, label %sw.bb
i16 1, label %sw.bb1
i16 2, label %sw.bb2
i16 3, label %sw.bb3
]
sw.bb: ; preds = %entry
store i16 0, i16* %retval
br label %return
sw.bb1: ; preds = %entry
store i16 1, i16* %retval
br label %return
sw.bb2: ; preds = %entry
store i16 2, i16* %retval
br label %return
sw.bb3: ; preds = %entry
store i16 3, i16* %retval
br label %return
sw.default: ; preds = %entry
store i16 2, i16* %retval
br label %return
return: ; preds = %sw.default, %sw.bb3, %sw.bb2, %sw.bb1, %sw.bb
%1 = load i16* %retval
ret i16 %1
; CHECK: ret
}
; CHECK: .LJTI0_0:
; CHECK-NEXT: .short .LBB0_2
; CHECK-NEXT: .short .LBB0_3
; CHECK-NEXT: .short .LBB0_4
; CHECK-NEXT: .short .LBB0_5