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ARM assembly parsing and encoding for LDR instructions.

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Enhance support for LDR instruction assembly parsing for post-indexed
addressing with immediate values. Add tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136940 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2011-08-04 23:01:30 +00:00
parent c219d191aa
commit 039c2e19c4
2 changed files with 37 additions and 8 deletions
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22
lib/Target/ARM/ARMInstrInfo.td
View File

@ -673,11 +673,15 @@ def am2offset_reg : Operand<i32>,
let MIOperandInfo = (ops GPR, i32imm);
}
// FIXME: am2offset_imm should only need the immediate, not the GPR. Having
// the GPR is purely vestigal at this point.
def AM2OffsetImmAsmOperand : AsmOperandClass { let Name = "AM2OffsetImm"; }
def am2offset_imm : Operand<i32>,
ComplexPattern<i32, 2, "SelectAddrMode2OffsetImm",
[], [SDNPWantRoot]> {
let EncoderMethod = "getAddrMode2OffsetOpValue";
let PrintMethod = "printAddrMode2OffsetOperand";
let ParserMatchClass = AM2OffsetImmAsmOperand;
let MIOperandInfo = (ops GPR, i32imm);
}
@ -1910,31 +1914,33 @@ multiclass AI2_ldridx<bit isByte, string opc, InstrItinClass itin> {
}
def _POST_REG : AI2ldstidx<1, isByte, 0, (outs GPR:$Rt, GPR:$Rn_wb),
(ins GPR:$Rn, am2offset_reg:$offset),
(ins addr_offset_none:$addr, am2offset_reg:$offset),
IndexModePost, LdFrm, itin,
opc, "\t$Rt, [$Rn], $offset", "$Rn = $Rn_wb", []> {
opc, "\t$Rt, $addr, $offset",
"$addr.base = $Rn_wb", []> {
// {12} isAdd
// {11-0} imm12/Rm
bits<14> offset;
bits<4> Rn;
bits<4> addr;
let Inst{25} = 1;
let Inst{23} = offset{12};
let Inst{19-16} = Rn;
let Inst{19-16} = addr;
let Inst{11-0} = offset{11-0};
let DecoderMethod = "DecodeAddrMode2IdxInstruction";
}
def _POST_IMM : AI2ldstidx<1, isByte, 0, (outs GPR:$Rt, GPR:$Rn_wb),
(ins GPR:$Rn, am2offset_imm:$offset),
(ins addr_offset_none:$addr, am2offset_imm:$offset),
IndexModePost, LdFrm, itin,
opc, "\t$Rt, [$Rn], $offset", "$Rn = $Rn_wb", []> {
opc, "\t$Rt, $addr, $offset",
"$addr.base = $Rn_wb", []> {
// {12} isAdd
// {11-0} imm12/Rm
bits<14> offset;
bits<4> Rn;
bits<4> addr;
let Inst{25} = 0;
let Inst{23} = offset{12};
let Inst{19-16} = Rn;
let Inst{19-16} = addr;
let Inst{11-0} = offset{11-0};
let DecoderMethod = "DecodeAddrMode2IdxInstruction";
}

23
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -520,6 +520,15 @@ public:
int64_t Val = Mem.OffsetImm->getValue();
return Val > -4096 && Val < 4096;
}
bool isAM2OffsetImm() const {
if (Kind != Immediate)
return false;
// Immediate offset in range [-4095, 4095].
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
if (!CE) return false;
int64_t Val = CE->getValue();
return Val > -4096 && Val < 4096;
}
bool isAddrMode5() const {
if (Kind != Memory)
return false;
@ -780,6 +789,20 @@ public:
Inst.addOperand(MCOperand::CreateImm(Val));
}
void addAM2OffsetImmOperands(MCInst &Inst, unsigned N) const {
assert(N == 2 && "Invalid number of operands!");
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
assert(CE && "non-constant AM2OffsetImm operand!");
int32_t Val = CE->getValue();
ARM_AM::AddrOpc AddSub = Val < 0 ? ARM_AM::sub : ARM_AM::add;
// Special case for #-0
if (Val == INT32_MIN) Val = 0;
if (Val < 0) Val = -Val;
Val = ARM_AM::getAM2Opc(AddSub, Val, ARM_AM::no_shift);
Inst.addOperand(MCOperand::CreateReg(0));
Inst.addOperand(MCOperand::CreateImm(Val));
}
void addAddrMode5Operands(MCInst &Inst, unsigned N) const {
assert(N == 2 && "Invalid number of operands!");
// The lower two bits are always zero and as such are not encoded.