From bb057453db627a8614091af7eff2de971644255a Mon Sep 17 00:00:00 2001 From: Richard Osborne Date: Wed, 16 Mar 2011 18:34:00 +0000 Subject: [PATCH] Add checkevent intrinsic to check if any resources owned by the current thread can event. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127741 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/IntrinsicsXCore.td | 6 + lib/Target/XCore/XCoreISelDAGToDAG.cpp | 182 +++++++++++++++++-------- lib/Target/XCore/XCoreInstrInfo.td | 7 + test/CodeGen/XCore/events.ll | 20 +++ 4 files changed, 160 insertions(+), 55 deletions(-) diff --git a/include/llvm/IntrinsicsXCore.td b/include/llvm/IntrinsicsXCore.td index 056ae04f913..48ff9ce5071 100644 --- a/include/llvm/IntrinsicsXCore.td +++ b/include/llvm/IntrinsicsXCore.td @@ -56,5 +56,11 @@ let TargetPrefix = "xcore" in { // All intrinsics start with "llvm.xcore.". // Intrinsics for events. def int_xcore_waitevent : Intrinsic<[llvm_ptr_ty],[], [IntrReadMem]>; + + // If any of the resources owned by the thread are ready this returns the + // vector of one of the ready resources. If no resources owned by the thread + // are ready then the operand passed to the intrinsic is returned. + def int_xcore_checkevent : Intrinsic<[llvm_ptr_ty],[llvm_ptr_ty]>; + def int_xcore_clre : Intrinsic<[],[],[]>; } diff --git a/lib/Target/XCore/XCoreISelDAGToDAG.cpp b/lib/Target/XCore/XCoreISelDAGToDAG.cpp index 4d2ff81ad45..8ce93fd93ad 100644 --- a/lib/Target/XCore/XCoreISelDAGToDAG.cpp +++ b/lib/Target/XCore/XCoreISelDAGToDAG.cpp @@ -49,7 +49,8 @@ namespace { Subtarget(*TM.getSubtargetImpl()) { } SDNode *Select(SDNode *N); - + SDNode *SelectBRIND(SDNode *N); + /// getI32Imm - Return a target constant with the specified value, of type /// i32. inline SDValue getI32Imm(unsigned Imm) { @@ -154,62 +155,133 @@ bool XCoreDAGToDAGISel::SelectADDRcpii(SDValue Addr, SDValue &Base, SDNode *XCoreDAGToDAGISel::Select(SDNode *N) { DebugLoc dl = N->getDebugLoc(); - EVT NVT = N->getValueType(0); - if (NVT == MVT::i32) { - switch (N->getOpcode()) { - default: break; - case ISD::Constant: { - uint64_t Val = cast(N)->getZExtValue(); - if (immMskBitp(N)) { - // Transformation function: get the size of a mask - // Look for the first non-zero bit - SDValue MskSize = getI32Imm(32 - CountLeadingZeros_32(Val)); - return CurDAG->getMachineNode(XCore::MKMSK_rus, dl, - MVT::i32, MskSize); - } - else if (!isUInt<16>(Val)) { - SDValue CPIdx = - CurDAG->getTargetConstantPool(ConstantInt::get( - Type::getInt32Ty(*CurDAG->getContext()), Val), - TLI.getPointerTy()); - return CurDAG->getMachineNode(XCore::LDWCP_lru6, dl, MVT::i32, - MVT::Other, CPIdx, - CurDAG->getEntryNode()); - } - break; - } - case XCoreISD::LADD: { - SDValue Ops[] = { N->getOperand(0), N->getOperand(1), - N->getOperand(2) }; - return CurDAG->getMachineNode(XCore::LADD_l5r, dl, MVT::i32, MVT::i32, - Ops, 3); - } - case XCoreISD::LSUB: { - SDValue Ops[] = { N->getOperand(0), N->getOperand(1), - N->getOperand(2) }; - return CurDAG->getMachineNode(XCore::LSUB_l5r, dl, MVT::i32, MVT::i32, - Ops, 3); + switch (N->getOpcode()) { + default: break; + case ISD::Constant: { + uint64_t Val = cast(N)->getZExtValue(); + if (immMskBitp(N)) { + // Transformation function: get the size of a mask + // Look for the first non-zero bit + SDValue MskSize = getI32Imm(32 - CountLeadingZeros_32(Val)); + return CurDAG->getMachineNode(XCore::MKMSK_rus, dl, + MVT::i32, MskSize); } - case XCoreISD::MACCU: { - SDValue Ops[] = { N->getOperand(0), N->getOperand(1), - N->getOperand(2), N->getOperand(3) }; - return CurDAG->getMachineNode(XCore::MACCU_l4r, dl, MVT::i32, MVT::i32, - Ops, 4); - } - case XCoreISD::MACCS: { - SDValue Ops[] = { N->getOperand(0), N->getOperand(1), - N->getOperand(2), N->getOperand(3) }; - return CurDAG->getMachineNode(XCore::MACCS_l4r, dl, MVT::i32, MVT::i32, - Ops, 4); - } - case XCoreISD::LMUL: { - SDValue Ops[] = { N->getOperand(0), N->getOperand(1), - N->getOperand(2), N->getOperand(3) }; - return CurDAG->getMachineNode(XCore::LMUL_l6r, dl, MVT::i32, MVT::i32, - Ops, 4); - } - // Other cases are autogenerated. + else if (!isUInt<16>(Val)) { + SDValue CPIdx = + CurDAG->getTargetConstantPool(ConstantInt::get( + Type::getInt32Ty(*CurDAG->getContext()), Val), + TLI.getPointerTy()); + return CurDAG->getMachineNode(XCore::LDWCP_lru6, dl, MVT::i32, + MVT::Other, CPIdx, + CurDAG->getEntryNode()); } + break; + } + case XCoreISD::LADD: { + SDValue Ops[] = { N->getOperand(0), N->getOperand(1), + N->getOperand(2) }; + return CurDAG->getMachineNode(XCore::LADD_l5r, dl, MVT::i32, MVT::i32, + Ops, 3); + } + case XCoreISD::LSUB: { + SDValue Ops[] = { N->getOperand(0), N->getOperand(1), + N->getOperand(2) }; + return CurDAG->getMachineNode(XCore::LSUB_l5r, dl, MVT::i32, MVT::i32, + Ops, 3); + } + case XCoreISD::MACCU: { + SDValue Ops[] = { N->getOperand(0), N->getOperand(1), + N->getOperand(2), N->getOperand(3) }; + return CurDAG->getMachineNode(XCore::MACCU_l4r, dl, MVT::i32, MVT::i32, + Ops, 4); + } + case XCoreISD::MACCS: { + SDValue Ops[] = { N->getOperand(0), N->getOperand(1), + N->getOperand(2), N->getOperand(3) }; + return CurDAG->getMachineNode(XCore::MACCS_l4r, dl, MVT::i32, MVT::i32, + Ops, 4); + } + case XCoreISD::LMUL: { + SDValue Ops[] = { N->getOperand(0), N->getOperand(1), + N->getOperand(2), N->getOperand(3) }; + return CurDAG->getMachineNode(XCore::LMUL_l6r, dl, MVT::i32, MVT::i32, + Ops, 4); + } + case ISD::BRIND: + if (SDNode *ResNode = SelectBRIND(N)) + return ResNode; + break; + // Other cases are autogenerated. } return SelectCode(N); } + +/// Given a chain return a new chain where any appearance of Old is replaced +/// by New. There must be at most one instruction between Old and Chain and +/// this instruction must be a TokenFactor. Returns an empty SDValue if +/// these conditions don't hold. +static SDValue +replaceInChain(SelectionDAG *CurDAG, SDValue Chain, SDValue Old, SDValue New) +{ + if (Chain == Old) + return New; + if (Chain->getOpcode() != ISD::TokenFactor) + return SDValue(); + SmallVector Ops; + bool found = false; + for (unsigned i = 0, e = Chain->getNumOperands(); i != e; ++i) { + if (Chain->getOperand(i) == Old) { + Ops.push_back(New); + found = true; + } else { + Ops.push_back(Chain->getOperand(i)); + } + } + if (!found) + return SDValue(); + return CurDAG->getNode(ISD::TokenFactor, Chain->getDebugLoc(), MVT::Other, + &Ops[0], Ops.size()); +} + +SDNode *XCoreDAGToDAGISel::SelectBRIND(SDNode *N) { + DebugLoc dl = N->getDebugLoc(); + // (brind (int_xcore_checkevent (addr))) + SDValue Chain = N->getOperand(0); + SDValue Addr = N->getOperand(1); + if (Addr->getOpcode() != ISD::INTRINSIC_W_CHAIN) + return 0; + unsigned IntNo = cast(Addr->getOperand(1))->getZExtValue(); + if (IntNo != Intrinsic::xcore_checkevent) + return 0; + SDValue nextAddr = Addr->getOperand(2); + SDValue CheckEventChainOut(Addr.getNode(), 1); + if (!CheckEventChainOut.use_empty()) { + // If the chain out of the checkevent intrinsic is an operand of the + // indirect branch or used in a TokenFactor which is the operand of the + // indirect branch then build a new chain which uses the chain coming into + // the checkevent intrinsic instead. + SDValue CheckEventChainIn = Addr->getOperand(0); + SDValue NewChain = replaceInChain(CurDAG, Chain, CheckEventChainOut, + CheckEventChainIn); + if (!NewChain.getNode()) + return 0; + Chain = NewChain; + } + // Enable events on the thread using setsr 1 and then disable them immediately + // after with clrsr 1. If any resources owned by the thread are ready an event + // will be taken. If no resource is ready we branch to the address which was + // the operand to the checkevent intrinsic. + SDValue constOne = getI32Imm(1); + SDValue Glue = + SDValue(CurDAG->getMachineNode(XCore::SETSR_branch_u6, dl, MVT::Glue, + constOne, Chain), 0); + Glue = + SDValue(CurDAG->getMachineNode(XCore::CLRSR_branch_u6, dl, MVT::Glue, + constOne, Glue), 0); + if (nextAddr->getOpcode() == XCoreISD::PCRelativeWrapper && + nextAddr->getOperand(0)->getOpcode() == ISD::TargetBlockAddress) { + return CurDAG->SelectNodeTo(N, XCore::BRFU_lu6, MVT::Other, + nextAddr->getOperand(0), Glue); + } + return CurDAG->SelectNodeTo(N, XCore::BAU_1r, MVT::Other, nextAddr, Glue); +} diff --git a/lib/Target/XCore/XCoreInstrInfo.td b/lib/Target/XCore/XCoreInstrInfo.td index 59c902d4343..c56792c7ee0 100644 --- a/lib/Target/XCore/XCoreInstrInfo.td +++ b/lib/Target/XCore/XCoreInstrInfo.td @@ -692,6 +692,13 @@ defm SETSR : FU6_LU6_int<"setsr", int_xcore_setsr>; defm CLRSR : FU6_LU6_int<"clrsr", int_xcore_clrsr>; +// setsr may cause a branch if it is used to enable events. clrsr may +// branch if it is executed while events are enabled. +let isBranch=1, isIndirectBranch=1, isTerminator=1, isBarrier = 1 in { +defm SETSR_branch : FU6_LU6_np<"setsr">; +defm CLRSR_branch : FU6_LU6_np<"clrsr">; +} + // U10 // TODO ldwcpl, blacp diff --git a/test/CodeGen/XCore/events.ll b/test/CodeGen/XCore/events.ll index 4fc2f26d1b6..30a6ec35513 100644 --- a/test/CodeGen/XCore/events.ll +++ b/test/CodeGen/XCore/events.ll @@ -2,6 +2,7 @@ declare void @llvm.xcore.setv.p1i8(i8 addrspace(1)* %r, i8* %p) declare i8* @llvm.xcore.waitevent() +declare i8* @llvm.xcore.checkevent(i8*) declare void @llvm.xcore.clre() define i32 @f(i8 addrspace(1)* %r) nounwind { @@ -22,3 +23,22 @@ ret: %retval = phi i32 [1, %L1], [2, %L2] ret i32 %retval } + +define i32 @g(i8 addrspace(1)* %r) nounwind { +; CHECK: g: +entry: +; CHECK: clre + call void @llvm.xcore.clre() + call void @llvm.xcore.setv.p1i8(i8 addrspace(1)* %r, i8* blockaddress(@f, %L1)) + %goto_addr = call i8* @llvm.xcore.checkevent(i8 *blockaddress(@f, %L2)) +; CHECK: setsr 1 +; CHECK: clrsr 1 + indirectbr i8* %goto_addr, [label %L1, label %L2] +L1: + br label %ret +L2: + br label %ret +ret: + %retval = phi i32 [1, %L1], [2, %L2] + ret i32 %retval +} -- 2.34.1