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bpf: add new insns for bswap_to_le and negation
This patch adds new insn, "reg = be16/be32/be64 reg", for bswap to little endian for big-endian target (bpfeb). It also adds new insn for negation "reg = -reg". Currently, for source code, e.g., b = -a LLVM still prefers to generate: b = 0 - a But "reg = -reg" format can be used in assembly code. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> llvm-svn: 314376
This commit is contained in:
Yonghong Song
parent
3115e502f7
commit
d15f16c0fd
@ -30,6 +30,8 @@ struct BPFOperand;
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class BPFAsmParser : public MCTargetAsmParser {
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SMLoc getLoc() const { return getParser().getTok().getLoc(); }
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bool PreMatchCheck(OperandVector &Operands);
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bool MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
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OperandVector &Operands, MCStreamer &Out,
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uint64_t &ErrorInfo,
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@ -225,9 +227,6 @@ public:
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.Case("*", true)
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.Case("exit", true)
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.Case("lock", true)
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.Case("bswap64", true)
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.Case("bswap32", true)
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.Case("bswap16", true)
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.Case("ld_pseudo", true)
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.Default(false);
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}
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@ -239,6 +238,12 @@ public:
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.Case("u32", true)
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.Case("u16", true)
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.Case("u8", true)
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.Case("be64", true)
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.Case("be32", true)
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.Case("be16", true)
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.Case("le64", true)
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.Case("le32", true)
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.Case("le16", true)
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.Case("goto", true)
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.Case("ll", true)
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.Case("skb", true)
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@ -252,6 +257,28 @@ public:
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#define GET_MATCHER_IMPLEMENTATION
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#include "BPFGenAsmMatcher.inc"
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bool BPFAsmParser::PreMatchCheck(OperandVector &Operands) {
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if (Operands.size() == 4) {
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// check "reg1 = -reg2" and "reg1 = be16/be32/be64/le16/le32/le64 reg2",
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// reg1 must be the same as reg2
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BPFOperand &Op0 = (BPFOperand &)*Operands[0];
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BPFOperand &Op1 = (BPFOperand &)*Operands[1];
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BPFOperand &Op2 = (BPFOperand &)*Operands[2];
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BPFOperand &Op3 = (BPFOperand &)*Operands[3];
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if (Op0.isReg() && Op1.isToken() && Op2.isToken() && Op3.isReg()
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&& Op1.getToken() == "="
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&& (Op2.getToken() == "-" || Op2.getToken() == "be16"
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|| Op2.getToken() == "be32" || Op2.getToken() == "be64"
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|| Op2.getToken() == "le16" || Op2.getToken() == "le32"
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|| Op2.getToken() == "le64")
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&& Op0.getReg() != Op3.getReg())
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return true;
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}
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return false;
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}
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bool BPFAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
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OperandVector &Operands,
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MCStreamer &Out, uint64_t &ErrorInfo,
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@ -259,6 +286,9 @@ bool BPFAsmParser::MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
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MCInst Inst;
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SMLoc ErrorLoc;
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if (PreMatchCheck(Operands))
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return Error(IDLoc, "additional inst constraint not met");
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switch (MatchInstructionImpl(Operands, Inst, ErrorInfo, MatchingInlineAsm)) {
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default:
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break;
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@ -324,13 +354,8 @@ BPFAsmParser::parseOperandAsOperator(OperandVector &Operands) {
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switch (getLexer().getKind()) {
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case AsmToken::Minus:
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case AsmToken::Plus: {
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StringRef Name = getLexer().getTok().getString();
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if (getLexer().peekTok().is(AsmToken::Integer))
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return MatchOperand_NoMatch;
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getLexer().Lex();
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Operands.push_back(BPFOperand::createToken(Name, S));
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}
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// Fall through.
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@ -38,6 +38,7 @@ def BPF_OR : BPFArithOp<0x4>;
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def BPF_AND : BPFArithOp<0x5>;
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def BPF_LSH : BPFArithOp<0x6>;
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def BPF_RSH : BPFArithOp<0x7>;
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def BPF_NEG : BPFArithOp<0x8>;
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def BPF_XOR : BPFArithOp<0xa>;
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def BPF_MOV : BPFArithOp<0xb>;
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def BPF_ARSH : BPFArithOp<0xc>;
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@ -43,6 +43,8 @@ def BPFbrcc : SDNode<"BPFISD::BR_CC", SDT_BPFBrCC,
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def BPFselectcc : SDNode<"BPFISD::SELECT_CC", SDT_BPFSelectCC, [SDNPInGlue]>;
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def BPFWrapper : SDNode<"BPFISD::Wrapper", SDT_BPFWrapper>;
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def BPFIsLittleEndian : Predicate<"CurDAG->getDataLayout().isLittleEndian()">;
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def BPFIsBigEndian : Predicate<"!CurDAG->getDataLayout().isLittleEndian()">;
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def brtarget : Operand<OtherVT>;
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def calltarget : Operand<i64>;
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@ -232,6 +234,26 @@ let isAsCheapAsAMove = 1 in {
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defm DIV : ALU<BPF_DIV, "/=", udiv>;
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}
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class NEG_RR<BPFOpClass Class, BPFArithOp Opc,
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dag outs, dag ins, string asmstr, list<dag> pattern>
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: TYPE_ALU_JMP<Opc.Value, 0, outs, ins, asmstr, pattern> {
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bits<4> dst;
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bits<4> src;
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let Inst{55-52} = src;
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let Inst{51-48} = dst;
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let BPFClass = Class;
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}
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let Constraints = "$dst = $src", isAsCheapAsAMove = 1 in {
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def NEG_64: NEG_RR<BPF_ALU64, BPF_NEG, (outs GPR:$dst), (ins GPR:$src),
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"$dst = -$src",
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[(set GPR:$dst, (ineg i64:$src))]>;
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def NEG_32: NEG_RR<BPF_ALU, BPF_NEG, (outs GPR32:$dst), (ins GPR32:$src),
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"$dst = -$src",
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[(set GPR32:$dst, (ineg i32:$src))]>;
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}
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class LD_IMM64<bits<4> Pseudo, string OpcodeStr>
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: TYPE_LD_ST<BPF_IMM.Value, BPF_DW.Value,
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(outs GPR:$dst),
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@ -484,11 +506,11 @@ def XADD64 : XADD<BPF_DW, "u64", atomic_load_add_64>;
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}
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// bswap16, bswap32, bswap64
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class BSWAP<bits<32> SizeOp, string OpcodeStr, list<dag> Pattern>
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: TYPE_ALU_JMP<BPF_END.Value, BPF_TO_BE.Value,
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class BSWAP<bits<32> SizeOp, string OpcodeStr, BPFSrcType SrcType, list<dag> Pattern>
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: TYPE_ALU_JMP<BPF_END.Value, SrcType.Value,
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(outs GPR:$dst),
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(ins GPR:$src),
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!strconcat(OpcodeStr, "\t$dst"),
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"$dst = "#OpcodeStr#" $src",
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Pattern> {
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bits<4> dst;
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@ -497,10 +519,18 @@ class BSWAP<bits<32> SizeOp, string OpcodeStr, list<dag> Pattern>
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let BPFClass = BPF_ALU;
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}
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let Constraints = "$dst = $src" in {
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def BSWAP16 : BSWAP<16, "bswap16", [(set GPR:$dst, (srl (bswap GPR:$src), (i64 48)))]>;
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def BSWAP32 : BSWAP<32, "bswap32", [(set GPR:$dst, (srl (bswap GPR:$src), (i64 32)))]>;
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def BSWAP64 : BSWAP<64, "bswap64", [(set GPR:$dst, (bswap GPR:$src))]>;
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let Predicates = [BPFIsLittleEndian] in {
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def BE16 : BSWAP<16, "be16", BPF_TO_BE, [(set GPR:$dst, (srl (bswap GPR:$src), (i64 48)))]>;
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def BE32 : BSWAP<32, "be32", BPF_TO_BE, [(set GPR:$dst, (srl (bswap GPR:$src), (i64 32)))]>;
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def BE64 : BSWAP<64, "be64", BPF_TO_BE, [(set GPR:$dst, (bswap GPR:$src))]>;
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}
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let Predicates = [BPFIsBigEndian] in {
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def LE16 : BSWAP<16, "le16", BPF_TO_LE, [(set GPR:$dst, (srl (bswap GPR:$src), (i64 48)))]>;
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def LE32 : BSWAP<32, "le32", BPF_TO_LE, [(set GPR:$dst, (srl (bswap GPR:$src), (i64 32)))]>;
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def LE64 : BSWAP<64, "le64", BPF_TO_LE, [(set GPR:$dst, (bswap GPR:$src))]>;
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}
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}
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let Defs = [R0, R1, R2, R3, R4, R5], Uses = [R6], hasSideEffects = 1,
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@ -1,4 +1,5 @@
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; RUN: llc < %s -march=bpfel -show-mc-encoding | FileCheck %s
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; RUN: llc < %s -march=bpfel -show-mc-encoding | FileCheck --check-prefix=CHECK-EL %s
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; RUN: llc < %s -march=bpfeb -show-mc-encoding | FileCheck --check-prefix=CHECK-EB %s
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; Function Attrs: nounwind uwtable
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define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
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@ -13,8 +14,10 @@ define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
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%9 = trunc i64 %8 to i32
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ret i32 %9
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; CHECK-LABEL: ld_b:
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; CHECK: r0 = *(u8 *)skb[123]
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; CHECK: r0 = *(u8 *)skb[r
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; CHECK-EL: r0 = *(u8 *)skb[123]
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; CHECK-EL: r0 = *(u8 *)skb[r
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; CHECK-EB: r0 = *(u8 *)skb[123]
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; CHECK-EB: r0 = *(u8 *)skb[r
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}
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declare i64 @llvm.bpf.load.byte(i8*, i64) #1
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@ -28,8 +31,10 @@ define i32 @ld_h(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
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%5 = trunc i64 %4 to i32
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ret i32 %5
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; CHECK-LABEL: ld_h:
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; CHECK: r0 = *(u16 *)skb[r
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; CHECK: r0 = *(u16 *)skb[123]
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; CHECK-EL: r0 = *(u16 *)skb[r
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; CHECK-EL: r0 = *(u16 *)skb[123]
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; CHECK-EB: r0 = *(u16 *)skb[r
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; CHECK-EB: r0 = *(u16 *)skb[123]
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}
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declare i64 @llvm.bpf.load.half(i8*, i64) #1
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@ -43,8 +48,10 @@ define i32 @ld_w(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
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%5 = trunc i64 %4 to i32
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ret i32 %5
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; CHECK-LABEL: ld_w:
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; CHECK: r0 = *(u32 *)skb[r
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; CHECK: r0 = *(u32 *)skb[123]
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; CHECK-EL: r0 = *(u32 *)skb[r
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; CHECK-EL: r0 = *(u32 *)skb[123]
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; CHECK-EB: r0 = *(u32 *)skb[r
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; CHECK-EB: r0 = *(u32 *)skb[123]
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}
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declare i64 @llvm.bpf.load.word(i8*, i64) #1
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@ -55,7 +62,8 @@ entry:
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tail call void inttoptr (i64 4 to void (i64, i32)*)(i64 %call, i32 4) #2
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ret i32 0
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; CHECK-LABEL: ld_pseudo:
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; CHECK: ld_pseudo r1, 2, 3 # encoding: [0x18,0x21,0x00,0x00,0x03,0x00
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; CHECK-EL: ld_pseudo r1, 2, 3 # encoding: [0x18,0x21,0x00,0x00,0x03,0x00,0x00,0x00
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; CHECK-EB: ld_pseudo r1, 2, 3 # encoding: [0x18,0x12,0x00,0x00,0x00,0x00,0x00,0x03
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}
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declare i64 @llvm.bpf.pseudo(i64, i64) #2
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@ -74,11 +82,16 @@ entry:
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%conv5 = trunc i64 %add4 to i32
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ret i32 %conv5
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; CHECK-LABEL: bswap:
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; CHECK: bswap64 r1 # encoding: [0xdc,0x01,0x00,0x00,0x40,0x00,0x00,0x00]
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; CHECK: bswap32 r2 # encoding: [0xdc,0x02,0x00,0x00,0x20,0x00,0x00,0x00]
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; CHECK: r2 += r1 # encoding: [0x0f,0x12,0x00,0x00,0x00,0x00,0x00,0x00]
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; CHECK: bswap16 r3 # encoding: [0xdc,0x03,0x00,0x00,0x10,0x00,0x00,0x00]
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; CHECK: r2 += r3 # encoding: [0x0f,0x32,0x00,0x00,0x00,0x00,0x00,0x00]
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; CHECK-EL: r1 = be64 r1 # encoding: [0xdc,0x01,0x00,0x00,0x40,0x00,0x00,0x00]
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; CHECK-EL: r2 = be32 r2 # encoding: [0xdc,0x02,0x00,0x00,0x20,0x00,0x00,0x00]
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; CHECK-EL: r2 += r1 # encoding: [0x0f,0x12,0x00,0x00,0x00,0x00,0x00,0x00]
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; CHECK-EL: r3 = be16 r3 # encoding: [0xdc,0x03,0x00,0x00,0x10,0x00,0x00,0x00]
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; CHECK-EL: r2 += r3 # encoding: [0x0f,0x32,0x00,0x00,0x00,0x00,0x00,0x00]
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; CHECK-EB: r1 = le64 r1 # encoding: [0xd4,0x10,0x00,0x00,0x00,0x00,0x00,0x40]
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; CHECK-EB: r2 = le32 r2 # encoding: [0xd4,0x20,0x00,0x00,0x00,0x00,0x00,0x20]
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; CHECK-EB: r2 += r1 # encoding: [0x0f,0x21,0x00,0x00,0x00,0x00,0x00,0x00]
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; CHECK-EB: r3 = le16 r3 # encoding: [0xd4,0x30,0x00,0x00,0x00,0x00,0x00,0x10]
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; CHECK-EB: r2 += r3 # encoding: [0x0f,0x23,0x00,0x00,0x00,0x00,0x00,0x00]
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}
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declare i64 @llvm.bswap.i64(i64) #1
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@ -1,4 +1,5 @@
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; RUN: llc -march=bpfel -filetype=obj -o - %s | llvm-objdump -d - | FileCheck %s
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; RUN: llc -march=bpfel -filetype=obj -o - %s | llvm-objdump -d - | FileCheck --check-prefix=CHECK-EL %s
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; RUN: llc -march=bpfeb -filetype=obj -o - %s | llvm-objdump -d - | FileCheck --check-prefix=CHECK-EB %s
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; Function Attrs: nounwind uwtable
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define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
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@ -13,8 +14,10 @@ define i32 @ld_b(i64 %foo, i64* nocapture %bar, i8* %ctx, i8* %ctx2) #0 {
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%9 = trunc i64 %8 to i32
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ret i32 %9
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; CHECK-LABEL: ld_b:
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; CHECK: r0 = *(u8 *)skb[123]
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; CHECK: r0 = *(u8 *)skb[r
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; CHECK-EL: r0 = *(u8 *)skb[123]
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; CHECK-EL: r0 = *(u8 *)skb[r
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; CHECK-EB: r0 = *(u8 *)skb[123]
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; CHECK-EB: r0 = *(u8 *)skb[r
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}
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declare i64 @llvm.bpf.load.byte(i8*, i64) #1
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@ -28,8 +31,10 @@ define i32 @ld_h(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
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%5 = trunc i64 %4 to i32
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ret i32 %5
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; CHECK-LABEL: ld_h:
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; CHECK: r0 = *(u16 *)skb[r
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; CHECK: r0 = *(u16 *)skb[123]
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; CHECK-EL: r0 = *(u16 *)skb[r
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; CHECK-EL: r0 = *(u16 *)skb[123]
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; CHECK-EB: r0 = *(u16 *)skb[r
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; CHECK-EB: r0 = *(u16 *)skb[123]
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}
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declare i64 @llvm.bpf.load.half(i8*, i64) #1
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@ -43,8 +48,10 @@ define i32 @ld_w(i8* %ctx, i8* %ctx2, i32 %foo) #0 {
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%5 = trunc i64 %4 to i32
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ret i32 %5
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; CHECK-LABEL: ld_w:
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; CHECK: r0 = *(u32 *)skb[r
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; CHECK: r0 = *(u32 *)skb[123]
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; CHECK-EL: r0 = *(u32 *)skb[r
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; CHECK-EL: r0 = *(u32 *)skb[123]
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; CHECK-EB: r0 = *(u32 *)skb[r
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; CHECK-EB: r0 = *(u32 *)skb[123]
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}
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declare i64 @llvm.bpf.load.word(i8*, i64) #1
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@ -55,7 +62,8 @@ entry:
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tail call void inttoptr (i64 4 to void (i64, i32)*)(i64 %call, i32 4) #2
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ret i32 0
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; CHECK-LABEL: ld_pseudo:
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; CHECK: ld_pseudo r1, 2, 3
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; CHECK-EL: ld_pseudo r1, 2, 3
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; CHECK-EB: ld_pseudo r1, 2, 3
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}
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declare i64 @llvm.bpf.pseudo(i64, i64) #2
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@ -74,11 +82,16 @@ entry:
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%conv5 = trunc i64 %add4 to i32
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ret i32 %conv5
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; CHECK-LABEL: bswap:
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; CHECK: bswap64 r1
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; CHECK: bswap32 r2
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; CHECK: r2 += r1
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; CHECK: bswap16 r3
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; CHECK: r2 += r3
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; CHECK-EL: r1 = be64 r1
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; CHECK-EL: r2 = be32 r2
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; CHECK-EL: r2 += r1
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; CHECK-EL: r3 = be16 r3
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; CHECK-EL: r2 += r3
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; CHECK-EB: r1 = le64 r1
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; CHECK-EB: r2 = le32 r2
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; CHECK-EB: r2 += r1
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; CHECK-EB: r3 = le16 r3
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; CHECK-EB: r2 += r3
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}
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declare i64 @llvm.bswap.i64(i64) #1
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@ -2,10 +2,12 @@
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# RUN: llvm-objdump -d -r %t | FileCheck %s
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// ======== BPF_ALU Class ========
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w1 = -w1 // BPF_NEG
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w0 += w1 // BPF_ADD | BPF_X
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||||
w1 -= w2 // BPF_SUB | BPF_X
|
||||
w2 *= w3 // BPF_MUL | BPF_X
|
||||
w3 /= w4 // BPF_DIV | BPF_X
|
||||
// CHECK: 84 11 00 00 00 00 00 00 w1 = -w1
|
||||
// CHECK: 0c 10 00 00 00 00 00 00 w0 += w1
|
||||
// CHECK: 1c 21 00 00 00 00 00 00 w1 -= w2
|
||||
// CHECK: 2c 32 00 00 00 00 00 00 w2 *= w3
|
||||
|
||||
@ -118,6 +118,7 @@
|
||||
// CHECK: 3f 43 00 00 00 00 00 00 r3 /= r4
|
||||
|
||||
Llabel0 :
|
||||
r0 = -r0 // BPF_NEG
|
||||
r4 |= r5 // BPF_OR | BPF_X
|
||||
r5 &= r6 // BPF_AND | BPF_X
|
||||
r6 <<= r7 // BPF_LSH | BPF_X
|
||||
@ -126,6 +127,7 @@ Llabel0 :
|
||||
r9 = r10 // BPF_MOV | BPF_X
|
||||
r10 s>>= r0 // BPF_ARSH | BPF_X
|
||||
// CHECK:Llabel0:
|
||||
// CHECK: 87 00 00 00 00 00 00 00 r0 = -r0
|
||||
// CHECK: 4f 54 00 00 00 00 00 00 r4 |= r5
|
||||
// CHECK: 5f 65 00 00 00 00 00 00 r5 &= r6
|
||||
// CHECK: 6f 76 00 00 00 00 00 00 r6 <<= r7
|
||||
@ -134,12 +136,12 @@ Llabel0 :
|
||||
// CHECK: bf a9 00 00 00 00 00 00 r9 = r10
|
||||
// CHECK: cf 0a 00 00 00 00 00 00 r10 s>>= r0
|
||||
|
||||
bswap16 r1 // BPF_END | BPF_TO_BE
|
||||
bswap32 r2 // BPF_END | BPF_TO_BE
|
||||
bswap64 r3 // BPF_END | BPF_TO_BE
|
||||
// CHECK: dc 01 00 00 10 00 00 00 bswap16 r1
|
||||
// CHECK: dc 02 00 00 20 00 00 00 bswap32 r2
|
||||
// CHECK: dc 03 00 00 40 00 00 00 bswap64 r3
|
||||
r1 = be16 r1 // BPF_END | BPF_TO_BE
|
||||
r2 = be32 r2 // BPF_END | BPF_TO_BE
|
||||
r3 = be64 r3 // BPF_END | BPF_TO_BE
|
||||
// CHECK: dc 01 00 00 10 00 00 00 r1 = be16 r1
|
||||
// CHECK: dc 02 00 00 20 00 00 00 r2 = be32 r2
|
||||
// CHECK: dc 03 00 00 40 00 00 00 r3 = be64 r3
|
||||
|
||||
r0 += 1 // BPF_ADD | BPF_K
|
||||
r1 -= 0x1 // BPF_SUB | BPF_K
|
||||
|
||||
Loading…
Reference in New Issue
Block a user