bpf: add variants of -mcpu=# and support for additional jmp insns
-mcpu=# will support:
. generic: the default insn set
. v1: insn set version 1, the same as generic
. v2: insn set version 2, version 1 + additional jmp insns
. probe: the compiler will probe the underlying kernel to
decide proper version of insn set.
We did not not use -mcpu=native since llc/llvm will interpret -mcpu=native
as the underlying hardware architecture regardless of -march value.
Currently, only x86_64 supports -mcpu=probe. Other architecture will
silently revert to "generic".
Also added -mcpu=help to print available cpu parameters.
llvm will print out the information only if there are at least one
cpu and at least one feature. Add an unused dummy feature to
enable the printout.
Examples for usage:
$ llc -march=bpf -mcpu=v1 -filetype=asm t.ll
$ llc -march=bpf -mcpu=v2 -filetype=asm t.ll
$ llc -march=bpf -mcpu=generic -filetype=asm t.ll
$ llc -march=bpf -mcpu=probe -filetype=asm t.ll
$ llc -march=bpf -mcpu=v3 -filetype=asm t.ll
'v3' is not a recognized processor for this target (ignoring processor)
...
$ llc -march=bpf -mcpu=help -filetype=asm t.ll
Available CPUs for this target:
generic - Select the generic processor.
probe - Select the probe processor.
v1 - Select the v1 processor.
v2 - Select the v2 processor.
Available features for this target:
dummy - unused feature.
Use +feature to enable a feature, or -feature to disable it.
For example, llc -mcpu=mycpu -mattr=+feature1,-feature2
...
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Yonghong Song <yhs@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
llvm-svn: 311522
diff --git a/llvm/lib/Target/BPF/BPF.td b/llvm/lib/Target/BPF/BPF.td
index 11abe52..2d0c22a 100644
--- a/llvm/lib/Target/BPF/BPF.td
+++ b/llvm/lib/Target/BPF/BPF.td
@@ -19,6 +19,12 @@
: Processor<Name, NoItineraries, Features>;
def : Proc<"generic", []>;
+def : Proc<"v1", []>;
+def : Proc<"v2", []>;
+def : Proc<"probe", []>;
+
+def DummyFeature : SubtargetFeature<"dummy", "isDummyMode",
+ "true", "unused feature">;
def BPFInstPrinter : AsmWriter {
string AsmWriterClassName = "InstPrinter";
diff --git a/llvm/lib/Target/BPF/BPFISelLowering.cpp b/llvm/lib/Target/BPF/BPFISelLowering.cpp
index 360de14..94b3c7a 100644
--- a/llvm/lib/Target/BPF/BPFISelLowering.cpp
+++ b/llvm/lib/Target/BPF/BPFISelLowering.cpp
@@ -130,6 +130,9 @@
MaxStoresPerMemset = MaxStoresPerMemsetOptSize = 128;
MaxStoresPerMemcpy = MaxStoresPerMemcpyOptSize = 128;
MaxStoresPerMemmove = MaxStoresPerMemmoveOptSize = 128;
+
+ // CPU/Feature control
+ HasJmpExt = STI.getHasJmpExt();
}
bool BPFTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
@@ -456,7 +459,8 @@
SDValue Dest = Op.getOperand(4);
SDLoc DL(Op);
- NegateCC(LHS, RHS, CC);
+ if (!getHasJmpExt())
+ NegateCC(LHS, RHS, CC);
return DAG.getNode(BPFISD::BR_CC, DL, Op.getValueType(), Chain, LHS, RHS,
DAG.getConstant(CC, DL, MVT::i64), Dest);
@@ -470,7 +474,8 @@
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
SDLoc DL(Op);
- NegateCC(LHS, RHS, CC);
+ if (!getHasJmpExt())
+ NegateCC(LHS, RHS, CC);
SDValue TargetCC = DAG.getConstant(CC, DL, MVT::i64);
@@ -570,6 +575,18 @@
case ISD::SETNE:
NewCC = isSelectOp ? BPF::JNE_rr : BPF::JNE_ri;
break;
+ case ISD::SETLT:
+ NewCC = isSelectOp ? BPF::JSLT_rr : BPF::JSLT_ri;
+ break;
+ case ISD::SETULT:
+ NewCC = isSelectOp ? BPF::JULT_rr : BPF::JULT_ri;
+ break;
+ case ISD::SETLE:
+ NewCC = isSelectOp ? BPF::JSLE_rr : BPF::JSLE_ri;
+ break;
+ case ISD::SETULE:
+ NewCC = isSelectOp ? BPF::JULE_rr : BPF::JULE_ri;
+ break;
default:
report_fatal_error("unimplemented select CondCode " + Twine(CC));
}
diff --git a/llvm/lib/Target/BPF/BPFISelLowering.h b/llvm/lib/Target/BPF/BPFISelLowering.h
index 0b8a8ca..35065f2 100644
--- a/llvm/lib/Target/BPF/BPFISelLowering.h
+++ b/llvm/lib/Target/BPF/BPFISelLowering.h
@@ -50,7 +50,12 @@
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const override;
+ bool getHasJmpExt() const { return HasJmpExt; }
+
private:
+ // Control Instruction Selection Features
+ bool HasJmpExt;
+
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
diff --git a/llvm/lib/Target/BPF/BPFInstrInfo.td b/llvm/lib/Target/BPF/BPFInstrInfo.td
index f683578..3b239e7 100644
--- a/llvm/lib/Target/BPF/BPFInstrInfo.td
+++ b/llvm/lib/Target/BPF/BPFInstrInfo.td
@@ -79,6 +79,14 @@
[{return (N->getZExtValue() == ISD::SETUGT);}]>;
def BPF_CC_GEU : PatLeaf<(i64 imm),
[{return (N->getZExtValue() == ISD::SETUGE);}]>;
+def BPF_CC_LE : PatLeaf<(i64 imm),
+ [{return (N->getZExtValue() == ISD::SETLE);}]>;
+def BPF_CC_LT : PatLeaf<(i64 imm),
+ [{return (N->getZExtValue() == ISD::SETLT);}]>;
+def BPF_CC_LTU : PatLeaf<(i64 imm),
+ [{return (N->getZExtValue() == ISD::SETULT);}]>;
+def BPF_CC_LEU : PatLeaf<(i64 imm),
+ [{return (N->getZExtValue() == ISD::SETULE);}]>;
// jump instructions
class JMP_RR<bits<4> Opc, string OpcodeStr, PatLeaf Cond>
@@ -136,6 +144,10 @@
defm JNE : J<0x5, "!=", BPF_CC_NE>;
defm JSGT : J<0x6, "s>", BPF_CC_GT>;
defm JSGE : J<0x7, "s>=", BPF_CC_GE>;
+defm JULT : J<0xa, "<", BPF_CC_LTU>;
+defm JULE : J<0xb, "<=", BPF_CC_LEU>;
+defm JSLT : J<0xc, "s<", BPF_CC_LT>;
+defm JSLE : J<0xd, "s<=", BPF_CC_LE>;
}
// ALU instructions
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.cpp b/llvm/lib/Target/BPF/BPFSubtarget.cpp
index c3a8b1c..42ca87f 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.cpp
+++ b/llvm/lib/Target/BPF/BPFSubtarget.cpp
@@ -13,6 +13,7 @@
#include "BPFSubtarget.h"
#include "BPF.h"
+#include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
@@ -25,7 +26,30 @@
void BPFSubtarget::anchor() {}
+BPFSubtarget &BPFSubtarget::initializeSubtargetDependencies(StringRef CPU,
+ StringRef FS) {
+ initializeEnvironment();
+ initSubtargetFeatures(CPU, FS);
+ return *this;
+}
+
+void BPFSubtarget::initializeEnvironment() {
+ HasJmpExt = false;
+}
+
+void BPFSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
+ if (CPU == "probe")
+ CPU = sys::detail::getHostCPUNameForBPF();
+ if (CPU == "generic" || CPU == "v1")
+ return;
+ if (CPU == "v2") {
+ HasJmpExt = true;
+ return;
+ }
+}
+
BPFSubtarget::BPFSubtarget(const Triple &TT, const std::string &CPU,
const std::string &FS, const TargetMachine &TM)
- : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(), FrameLowering(*this),
+ : BPFGenSubtargetInfo(TT, CPU, FS), InstrInfo(),
+ FrameLowering(initializeSubtargetDependencies(CPU, FS)),
TLInfo(TM, *this) {}
diff --git a/llvm/lib/Target/BPF/BPFSubtarget.h b/llvm/lib/Target/BPF/BPFSubtarget.h
index 27cc9a2..d88d70d 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.h
+++ b/llvm/lib/Target/BPF/BPFSubtarget.h
@@ -35,15 +35,30 @@
BPFTargetLowering TLInfo;
SelectionDAGTargetInfo TSInfo;
+private:
+ void initializeEnvironment();
+ void initSubtargetFeatures(StringRef CPU, StringRef FS);
+ bool probeJmpExt();
+
+protected:
+ // unused
+ bool isDummyMode;
+
+ // whether the cpu supports jmp ext
+ bool HasJmpExt;
+
public:
// This constructor initializes the data members to match that
// of the specified triple.
BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
const TargetMachine &TM);
+ BPFSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
+
// ParseSubtargetFeatures - Parses features string setting specified
// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
+ bool getHasJmpExt() const { return HasJmpExt; }
const BPFInstrInfo *getInstrInfo() const override { return &InstrInfo; }
const BPFFrameLowering *getFrameLowering() const override {