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ARM Binary encoding information for BFC/BFI instructions. 

llvm-svn: 117072
This commit is contained in:
Jim Grosbach 2010-10-21 22:03:21 +00:00
parent de7cd9229e
commit 5edb03ee57
4 changed files with 42 additions and 6 deletions
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2
llvm/lib/Target/ARM/ARMCodeEmitter.cpp
View File

@ -172,6 +172,8 @@ namespace {
const { return 0; }
unsigned getImmMinusOneOpValue(const MachineInstr &MI, unsigned Op)
const { return 0; }
unsigned getBitfieldInvertedMaskOpValue(const MachineInstr &MI,
unsigned Op) const { return 0; }
/// getMovi32Value - Return binary encoding of operand for movw/movt. If the
/// machine operand requires relocation, record the relocation and return

25
llvm/lib/Target/ARM/ARMInstrInfo.td
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@ -232,6 +232,7 @@ def bf_inv_mask_imm : Operand<i32>,
PatLeaf<(imm), [{
return ARM::isBitFieldInvertedMask(N->getZExtValue());
}] > {
string EncoderMethod = "getBitfieldInvertedMaskOpValue";
let PrintMethod = "printBitfieldInvMaskImmOperand";
}
@ -2174,24 +2175,36 @@ defm BIC : AsI1_bin_irs<0b1110, "bic",
IIC_iBITi, IIC_iBITr, IIC_iBITsr,
BinOpFrag<(and node:$LHS, (not node:$RHS))>>;
def BFC : I<(outs GPR:$dst), (ins GPR:$src, bf_inv_mask_imm:$imm),
def BFC : I<(outs GPR:$Rd), (ins GPR:$src, bf_inv_mask_imm:$imm),
AddrMode1, Size4Bytes, IndexModeNone, DPFrm, IIC_iUNAsi,
"bfc", "\t$dst, $imm", "$src = $dst",
[(set GPR:$dst, (and GPR:$src, bf_inv_mask_imm:$imm))]>,
"bfc", "\t$Rd, $imm", "$src = $Rd",
[(set GPR:$Rd, (and GPR:$src, bf_inv_mask_imm:$imm))]>,
Requires<[IsARM, HasV6T2]> {
bits<4> Rd;
bits<10> imm;
let Inst{27-21} = 0b0111110;
let Inst{6-0} = 0b0011111;
let Inst{15-12} = Rd;
let Inst{11-7} = imm{4-0}; // lsb
let Inst{20-16} = imm{9-5}; // width
}
// A8.6.18 BFI - Bitfield insert (Encoding A1)
def BFI : I<(outs GPR:$dst), (ins GPR:$src, GPR:$val, bf_inv_mask_imm:$imm),
def BFI : I<(outs GPR:$Rd), (ins GPR:$src, GPR:$Rn, bf_inv_mask_imm:$imm),
AddrMode1, Size4Bytes, IndexModeNone, DPFrm, IIC_iUNAsi,
"bfi", "\t$dst, $val, $imm", "$src = $dst",
[(set GPR:$dst, (ARMbfi GPR:$src, GPR:$val,
"bfi", "\t$Rd, $Rn, $imm", "$src = $Rd",
[(set GPR:$Rd, (ARMbfi GPR:$src, GPR:$Rn,
bf_inv_mask_imm:$imm))]>,
Requires<[IsARM, HasV6T2]> {
bits<4> Rd;
bits<4> Rn;
bits<10> imm;
let Inst{27-21} = 0b0111110;
let Inst{6-4} = 0b001; // Rn: Inst{3-0} != 15
let Inst{15-12} = Rd;
let Inst{11-7} = imm{4-0}; // lsb
let Inst{20-16} = imm{9-5}; // width
let Inst{3-0} = Rn;
}
def MVNr : AsI1<0b1111, (outs GPR:$dst), (ins GPR:$src), DPFrm, IIC_iMVNr,

14
llvm/lib/Target/ARM/ARMMCCodeEmitter.cpp
View File

@ -88,6 +88,8 @@ public:
return MI.getOperand(Op).getImm() - 1;
}
unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op) const;
unsigned getNumFixupKinds() const {
assert(0 && "ARMMCCodeEmitter::getNumFixupKinds() not yet implemented.");
return 0;
@ -238,6 +240,18 @@ unsigned ARMMCCodeEmitter::getSORegOpValue(const MCInst &MI,
return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
}
unsigned ARMMCCodeEmitter::getBitfieldInvertedMaskOpValue(const MCInst &MI,
unsigned Op) const {
// 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
// msb of the mask.
const MCOperand &MO = MI.getOperand(Op);
uint32_t v = ~MO.getImm();
uint32_t lsb = CountTrailingZeros_32(v);
uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
return lsb | (msb << 5);
}
void ARMMCCodeEmitter::
EncodeInstruction(const MCInst &MI, raw_ostream &OS,
SmallVectorImpl<MCFixup> &Fixups) const {

7
llvm/test/MC/ARM/simple-encoding.ll
View File

@ -114,4 +114,11 @@ entry:
ret i32 %mul
}
define i32 @f12(i32 %a) {
; CHECK: f12:
; CHECK: bfc r0, #4, #20 @ encoding: [0x1f,0x02,0xd7,0xe7]
%tmp = and i32 %a, 4278190095
ret i32 %tmp
}
declare void @llvm.trap() nounwind