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The MC code couldn't handle ARM LDR instructions with negative offsets:

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vldr.64 d1, [r0, #-32]

The problem was with how the addressing mode 5 encodes the offsets. This change
makes sure that the way offsets are handled in addressing mode 5 is consistent
throughout the MC code. It involves re-refactoring the "getAddrModeImmOpValue"
method into an "Imm12" and "addressing mode 5" version. But not to worry! The
majority of the duplicated code has been unified.

llvm-svn: 118144
This commit is contained in:
Bill Wendling 2010-11-03 01:49:29 +00:00
parent 8071a75d31
commit 34599f4aa8
7 changed files with 160 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
lib/Target/ARM/ARMCodeEmitter.cpp
View File

@ -177,25 +177,44 @@ namespace {
const { return 0; }
unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
unsigned Op) const { return 0; }
uint32_t getAddrModeImmOpValue(const MachineInstr &MI, unsigned Op) const {
// {20-17} = reg
// {16} = (U)nsigned (add == '1', sub == '0')
// {15-0} = imm
unsigned getAddrModeImm12OpValue(const MachineInstr &MI, unsigned Op)
const {
// {17-13} = reg
// {12} = (U)nsigned (add == '1', sub == '0')
// {11-0} = imm12
const MachineOperand &MO = MI.getOperand(Op);
const MachineOperand &MO1 = MI.getOperand(Op + 1);
if (!MO.isReg()) {
emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
return 0;
}
unsigned Reg = getARMRegisterNumbering(MO.getReg());
int32_t Imm = MO1.getImm();
int32_t Imm12 = MO1.getImm();
uint32_t Binary;
Binary = Imm & 0xffff;
if (Imm >= 0)
Binary |= (1 << 16);
Binary |= (Reg << 17);
Binary = Imm12 & 0xfff;
if (Imm12 >= 0)
Binary |= (1 << 12);
Binary |= (Reg << 13);
return Binary;
}
uint32_t getAddrMode5OpValue(const MachineInstr &MI, unsigned Op) const {
// {12-9} = reg
// {8} = (U)nsigned (add == '1', sub == '0')
// {7-0} = imm12
const MachineOperand &MO = MI.getOperand(Op);
const MachineOperand &MO1 = MI.getOperand(Op + 1);
if (!MO.isReg()) {
emitConstPoolAddress(MO.getIndex(), ARM::reloc_arm_cp_entry);
return 0;
}
unsigned Reg = getARMRegisterNumbering(MO.getReg());
int32_t Imm8 = MO1.getImm();
uint32_t Binary;
Binary = Imm8 & 0xff;
if (Imm8 >= 0)
Binary |= (1 << 8);
Binary |= (Reg << 9);
return Binary;
}
unsigned getNEONVcvtImm32OpValue(const MachineInstr &MI, unsigned Op)

20
lib/Target/ARM/ARMInstrInfo.td
View File

@ -398,7 +398,7 @@ def addrmode_imm12 : Operand<i32>,
// #0 and #-0 differently. We flag #-0 as the magic value INT32_MIN. All other
// immediate values are as normal.
string EncoderMethod = "getAddrModeImmOpValue";
string EncoderMethod = "getAddrModeImm12OpValue";
let PrintMethod = "printAddrModeImm12Operand";
let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
}
@ -462,7 +462,7 @@ def addrmode5 : Operand<i32>,
let PrintMethod = "printAddrMode5Operand";
let MIOperandInfo = (ops GPR:$base, i32imm);
let ParserMatchClass = ARMMemMode5AsmOperand;
string EncoderMethod = "getAddrModeImmOpValue";
string EncoderMethod = "getAddrMode5OpValue";
}
// addrmode6 := reg with optional writeback
@ -828,20 +828,20 @@ multiclass AI_ldr1<bit opc22, string opc, InstrItinClass iii,
def i12 : AIldst1<0b010, opc22, 1, (outs GPR:$Rt), (ins addrmode_imm12:$addr),
AddrMode_i12, LdFrm, iii, opc, "\t$Rt, $addr",
[(set GPR:$Rt, (opnode addrmode_imm12:$addr))]> {
bits<4> Rt;
bits<32> addr;
let Inst{23} = addr{16}; // U (add = ('U' == 1))
let Inst{19-16} = addr{20-17}; // Rn
bits<4> Rt;
bits<17> addr;
let Inst{23} = addr{12}; // U (add = ('U' == 1))
let Inst{19-16} = addr{16-13}; // Rn
let Inst{15-12} = Rt;
let Inst{11-0} = addr{11-0}; // imm12
}
def rs : AIldst1<0b011, opc22, 1, (outs GPR:$Rt), (ins ldst_so_reg:$shift),
AddrModeNone, LdFrm, iir, opc, "\t$Rt, $shift",
[(set GPR:$Rt, (opnode ldst_so_reg:$shift))]> {
bits<4> Rt;
bits<32> shift;
let Inst{23} = shift{16}; // U (add = ('U' == 1))
let Inst{19-16} = shift{20-17}; // Rn
bits<4> Rt;
bits<17> shift;
let Inst{23} = shift{12}; // U (add = ('U' == 1))
let Inst{19-16} = shift{16-13}; // Rn
let Inst{11-0} = shift{11-0};
}
}

29
lib/Target/ARM/ARMInstrVFP.td
View File

@ -51,25 +51,38 @@ def vfp_f64imm : Operand<f64>,
//
let canFoldAsLoad = 1, isReMaterializable = 1 in {
def VLDRD : ADI5<0b1101, 0b01, (outs DPR:$Dd), (ins addrmode5:$addr),
IIC_fpLoad64, "vldr", ".64\t$Dd, $addr",
[(set DPR:$Dd, (f64 (load addrmode5:$addr)))]> {
// Instruction operands.
bits<5> Dd;
bits<32> addr;
bits<5> Dd;
bits<13> addr;
// Encode instruction operands.
let Inst{23} = addr{16}; // U (add = (U == '1'))
let Inst{23} = addr{8}; // U (add = (U == '1'))
let Inst{22} = Dd{4};
let Inst{19-16} = addr{20-17}; // Rn
let Inst{19-16} = addr{12-9}; // Rn
let Inst{15-12} = Dd{3-0};
let Inst{7-0} = addr{7-0}; // imm8
}
def VLDRS : ASI5<0b1101, 0b01, (outs SPR:$dst), (ins addrmode5:$addr),
IIC_fpLoad32, "vldr", ".32\t$dst, $addr",
[(set SPR:$dst, (load addrmode5:$addr))]>;
} // canFoldAsLoad
def VLDRS : ASI5<0b1101, 0b01, (outs SPR:$Sd), (ins addrmode5:$addr),
IIC_fpLoad32, "vldr", ".32\t$Sd, $addr",
[(set SPR:$Sd, (load addrmode5:$addr))]> {
// Instruction operands.
bits<5> Sd;
bits<13> addr;
// Encode instruction operands.
let Inst{23} = addr{8}; // U (add = (U == '1'))
let Inst{22} = Sd{0};
let Inst{19-16} = addr{12-9}; // Rn
let Inst{15-12} = Sd{4-1};
let Inst{7-0} = addr{7-0}; // imm8
}
} // End of 'let canFoldAsLoad = 1, isReMaterializable = 1 in'
def VSTRD : ADI5<0b1101, 0b00, (outs), (ins DPR:$src, addrmode5:$addr),
IIC_fpStore64, "vstr", ".64\t$src, $addr",

84
lib/Target/ARM/ARMMCCodeEmitter.cpp
View File

@ -49,8 +49,15 @@ public:
/// operand requires relocation, record the relocation and return zero.
unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO) const;
/// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
uint32_t getAddrModeImmOpValue(const MCInst &MI, unsigned Op) const;
bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
unsigned &Reg, unsigned &Imm) const;
/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
/// operand.
uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx) const;
/// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx) const;
/// getCCOutOpValue - Return encoding of the 's' bit.
unsigned getCCOutOpValue(const MCInst &MI, unsigned Op) const {
@ -170,37 +177,76 @@ unsigned ARMMCCodeEmitter::getMachineOpValue(const MCInst &MI,
}
/// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
uint32_t ARMMCCodeEmitter::getAddrModeImmOpValue(const MCInst &MI,
unsigned OpIdx) const {
// {20-17} = reg
// {16} = (U)nsigned (add == '1', sub == '0')
// {15-0} = imm
bool ARMMCCodeEmitter::EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
unsigned &Reg,
unsigned &Imm) const {
const MCOperand &MO = MI.getOperand(OpIdx);
const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
uint32_t Binary = 0;
// If The first operand isn't a register, we have a label reference.
if (!MO.isReg()) {
Binary |= ARM::PC << 17; // Rn is PC.
Reg = ARM::PC; // Rn is PC.
Imm = 0;
// FIXME: Add a fixup referencing the label.
return Binary;
return true;
}
unsigned Reg = getARMRegisterNumbering(MO.getReg());
int32_t Imm = MO1.getImm();
bool isAdd = Imm >= 0;
Reg = getARMRegisterNumbering(MO.getReg());
int32_t SImm = MO1.getImm();
bool isAdd = true;
// Special value for #-0
if (Imm == INT32_MIN)
Imm = 0;
if (SImm == INT32_MIN)
SImm = 0;
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
if (Imm < 0) Imm = -Imm;
if (SImm < 0) {
SImm = -SImm;
isAdd = false;
}
Binary = Imm & 0xffff;
Imm = SImm;
return isAdd;
}
/// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
uint32_t ARMMCCodeEmitter::getAddrModeImm12OpValue(const MCInst &MI,
unsigned OpIdx) const {
// {17-13} = reg
// {12} = (U)nsigned (add == '1', sub == '0')
// {11-0} = imm12
unsigned Reg, Imm12;
bool isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12);
if (Reg == ARM::PC)
return ARM::PC << 13; // Rn is PC;
uint32_t Binary = Imm12 & 0xfff;
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
if (isAdd)
Binary |= (1 << 16);
Binary |= (Reg << 17);
Binary |= (1 << 12);
Binary |= (Reg << 13);
return Binary;
}
/// getAddrMode5OpValue - Return encoding info for 'reg +/- imm12' operand.
uint32_t ARMMCCodeEmitter::getAddrMode5OpValue(const MCInst &MI,
unsigned OpIdx) const {
// {12-9} = reg
// {8} = (U)nsigned (add == '1', sub == '0')
// {7-0} = imm8
unsigned Reg, Imm8;
EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8);
if (Reg == ARM::PC)
return ARM::PC << 13; // Rn is PC;
uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
// Immediate is always encoded as positive. The 'U' bit controls add vs sub.
if (ARM_AM::getAM5Op(Imm8) == ARM_AM::add)
Binary |= (1 << 8);
Binary |= (Reg << 9);
return Binary;
}

16
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -8,6 +8,7 @@
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMAddressingModes.h"
#include "ARMSubtarget.h"
#include "llvm/MC/MCParser/MCAsmLexer.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
@ -260,16 +261,25 @@ public:
Inst.addOperand(MCOperand::CreateReg(Mem.BaseRegNum));
assert(!Mem.OffsetIsReg && "invalid mode 5 operand");
// FIXME: #-0 is encoded differently than #0. Does the parser preserve
// the difference?
if (Mem.Offset) {
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Mem.Offset);
assert(CE && "non-constant mode 5 offset operand!");
assert(CE && "Non-constant mode 5 offset operand!");
// The MCInst offset operand doesn't include the low two bits (like
// the instruction encoding).
Inst.addOperand(MCOperand::CreateImm(CE->getValue() / 4));
} else
int64_t Offset = CE->getValue() / 4;
if (Offset >= 0)
Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::add,
Offset)));
else
Inst.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(ARM_AM::sub,
-Offset)));
} else {
Inst.addOperand(MCOperand::CreateImm(0));
}
}
virtual void dump(raw_ostream &OS) const;

2
lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
View File

@ -310,7 +310,7 @@ void ARMInstPrinter::printAddrMode5Operand(const MCInst *MI, unsigned OpNum,
if (unsigned ImmOffs = ARM_AM::getAM5Offset(MO2.getImm())) {
O << ", #"
<< ARM_AM::getAddrOpcStr(ARM_AM::getAM5Op(MO2.getImm()))
<< ImmOffs*4;
<< ImmOffs * 4;
}
O << "]";
}

21
test/MC/ARM/simple-fp-encoding.s
View File

@ -162,8 +162,9 @@
vldr.64 d17, [r0]
@ CHECK: vldr.64 d1, [r2, #32] @ encoding: [0x08,0x1b,0x92,0xed]
@ CHECK: vldr.64 d1, [r2, #-32] @ encoding: [0x08,0x1b,0x12,0xed]
vldr.64 d1, [r2, #32]
vldr.64 d1, [r2, #-32]
@ CHECK: vldr.64 d2, [r3] @ encoding: [0x00,0x2b,0x93,0xed]
vldr.64 d2, [r3]
@ -174,3 +175,21 @@
vldr.64 d3, [pc]
vldr.64 d3, [pc,#0]
vldr.64 d3, [pc,#-0]
@ CHECK: vldr.32 s13, [r0] @ encoding: [0x00,0x6a,0xd0,0xed]
vldr.32 s13, [r0]
@ CHECK: vldr.32 s1, [r2, #32] @ encoding: [0x08,0x0a,0xd2,0xed]
@ CHECK: vldr.32 s1, [r2, #-32] @ encoding: [0x08,0x0a,0x52,0xed]
vldr.32 s1, [r2, #32]
vldr.32 s1, [r2, #-32]
@ CHECK: vldr.32 s2, [r3] @ encoding: [0x00,0x1a,0x93,0xed]
vldr.32 s2, [r3]
@ CHECK: vldr.32 s5, [pc] @ encoding: [0x00,0x2a,0xdf,0xed]
@ CHECK: vldr.32 s5, [pc] @ encoding: [0x00,0x2a,0xdf,0xed]
@ CHECK: vldr.32 s5, [pc] @ encoding: [0x00,0x2a,0xdf,0xed]
vldr.32 s5, [pc]
vldr.32 s5, [pc,#0]
vldr.32 s5, [pc,#-0]