diff options
Diffstat (limited to 'llvm/lib/Target/Mips')
| -rw-r--r-- | llvm/lib/Target/Mips/MipsISelLowering.cpp | 275 | ||||
| -rw-r--r-- | llvm/lib/Target/Mips/MipsISelLowering.h | 7 |
2 files changed, 246 insertions, 36 deletions
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp index e148da139a6..a23ffd7288a 100644 --- a/llvm/lib/Target/Mips/MipsISelLowering.cpp +++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp @@ -11,8 +11,8 @@ // selection DAG. // //===----------------------------------------------------------------------===// - #define DEBUG_TYPE "mips-lower" +#include <set> #include "MipsISelLowering.h" #include "InstPrinter/MipsInstPrinter.h" #include "MCTargetDesc/MipsBaseInfo.h" @@ -205,39 +205,64 @@ const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const { } } +namespace { + struct eqstr { + bool operator()(const char *s1, const char *s2) const + { + return strcmp(s1, s2) == 0; + } + }; + + std::set<const char*, eqstr> noHelperNeeded; + + const char* addToNoHelperNeeded(const char* s) { + noHelperNeeded.insert(s); + return s; + } + +} + void MipsTargetLowering::setMips16HardFloatLibCalls() { - setLibcallName(RTLIB::ADD_F32, "__mips16_addsf3"); - setLibcallName(RTLIB::ADD_F64, "__mips16_adddf3"); - setLibcallName(RTLIB::SUB_F32, "__mips16_subsf3"); - setLibcallName(RTLIB::SUB_F64, "__mips16_subdf3"); - setLibcallName(RTLIB::MUL_F32, "__mips16_mulsf3"); - setLibcallName(RTLIB::MUL_F64, "__mips16_muldf3"); - setLibcallName(RTLIB::DIV_F32, "__mips16_divsf3"); - setLibcallName(RTLIB::DIV_F64, "__mips16_divdf3"); - setLibcallName(RTLIB::FPEXT_F32_F64, "__mips16_extendsfdf2"); - setLibcallName(RTLIB::FPROUND_F64_F32, "__mips16_truncdfsf2"); - setLibcallName(RTLIB::FPTOSINT_F32_I32, "__mips16_fix_truncsfsi"); - setLibcallName(RTLIB::FPTOSINT_F64_I32, "__mips16_fix_truncdfsi"); - setLibcallName(RTLIB::SINTTOFP_I32_F32, "__mips16_floatsisf"); - setLibcallName(RTLIB::SINTTOFP_I32_F64, "__mips16_floatsidf"); - setLibcallName(RTLIB::UINTTOFP_I32_F32, "__mips16_floatunsisf"); - setLibcallName(RTLIB::UINTTOFP_I32_F64, "__mips16_floatunsidf"); - setLibcallName(RTLIB::OEQ_F32, "__mips16_eqsf2"); - setLibcallName(RTLIB::OEQ_F64, "__mips16_eqdf2"); - setLibcallName(RTLIB::UNE_F32, "__mips16_nesf2"); - setLibcallName(RTLIB::UNE_F64, "__mips16_nedf2"); - setLibcallName(RTLIB::OGE_F32, "__mips16_gesf2"); - setLibcallName(RTLIB::OGE_F64, "__mips16_gedf2"); - setLibcallName(RTLIB::OLT_F32, "__mips16_ltsf2"); - setLibcallName(RTLIB::OLT_F64, "__mips16_ltdf2"); - setLibcallName(RTLIB::OLE_F32, "__mips16_lesf2"); - setLibcallName(RTLIB::OLE_F64, "__mips16_ledf2"); - setLibcallName(RTLIB::OGT_F32, "__mips16_gtsf2"); - setLibcallName(RTLIB::OGT_F64, "__mips16_gtdf2"); - setLibcallName(RTLIB::UO_F32, "__mips16_unordsf2"); - setLibcallName(RTLIB::UO_F64, "__mips16_unorddf2"); - setLibcallName(RTLIB::O_F32, "__mips16_unordsf2"); - setLibcallName(RTLIB::O_F64, "__mips16_unorddf2"); + setLibcallName(RTLIB::ADD_F32, addToNoHelperNeeded("__mips16_addsf3")); + setLibcallName(RTLIB::ADD_F64, addToNoHelperNeeded("__mips16_adddf3")); + setLibcallName(RTLIB::SUB_F32, addToNoHelperNeeded("__mips16_subsf3")); + setLibcallName(RTLIB::SUB_F64, addToNoHelperNeeded("__mips16_subdf3")); + setLibcallName(RTLIB::MUL_F32, addToNoHelperNeeded("__mips16_mulsf3")); + setLibcallName(RTLIB::MUL_F64, addToNoHelperNeeded("__mips16_muldf3")); + setLibcallName(RTLIB::DIV_F32, addToNoHelperNeeded("__mips16_divsf3")); + setLibcallName(RTLIB::DIV_F64, addToNoHelperNeeded("__mips16_divdf3")); + setLibcallName(RTLIB::FPEXT_F32_F64, + addToNoHelperNeeded("__mips16_extendsfdf2")); + setLibcallName(RTLIB::FPROUND_F64_F32, + addToNoHelperNeeded("__mips16_truncdfsf2")); + setLibcallName(RTLIB::FPTOSINT_F32_I32, + addToNoHelperNeeded("__mips16_fix_truncsfsi")); + setLibcallName(RTLIB::FPTOSINT_F64_I32, + addToNoHelperNeeded("__mips16_fix_truncdfsi")); + setLibcallName(RTLIB::SINTTOFP_I32_F32, + addToNoHelperNeeded("__mips16_floatsisf")); + setLibcallName(RTLIB::SINTTOFP_I32_F64, + addToNoHelperNeeded("__mips16_floatsidf")); + setLibcallName(RTLIB::UINTTOFP_I32_F32, + addToNoHelperNeeded("__mips16_floatunsisf")); + setLibcallName(RTLIB::UINTTOFP_I32_F64, + addToNoHelperNeeded("__mips16_floatunsidf")); + setLibcallName(RTLIB::OEQ_F32, addToNoHelperNeeded("__mips16_eqsf2")); + setLibcallName(RTLIB::OEQ_F64, addToNoHelperNeeded("__mips16_eqdf2")); + setLibcallName(RTLIB::UNE_F32, addToNoHelperNeeded("__mips16_nesf2")); + setLibcallName(RTLIB::UNE_F64, addToNoHelperNeeded("__mips16_nedf2")); + setLibcallName(RTLIB::OGE_F32, addToNoHelperNeeded("__mips16_gesf2")); + setLibcallName(RTLIB::OGE_F64, addToNoHelperNeeded("__mips16_gedf2")); + setLibcallName(RTLIB::OLT_F32, addToNoHelperNeeded("__mips16_ltsf2")); + setLibcallName(RTLIB::OLT_F64, addToNoHelperNeeded("__mips16_ltdf2")); + setLibcallName(RTLIB::OLE_F32, addToNoHelperNeeded("__mips16_lesf2")); + setLibcallName(RTLIB::OLE_F64, addToNoHelperNeeded("__mips16_ledf2")); + setLibcallName(RTLIB::OGT_F32, addToNoHelperNeeded("__mips16_gtsf2")); + setLibcallName(RTLIB::OGT_F64, addToNoHelperNeeded("__mips16_gtdf2")); + setLibcallName(RTLIB::UO_F32, addToNoHelperNeeded("__mips16_unordsf2")); + setLibcallName(RTLIB::UO_F64, addToNoHelperNeeded("__mips16_unorddf2")); + setLibcallName(RTLIB::O_F32, addToNoHelperNeeded("__mips16_unordsf2")); + setLibcallName(RTLIB::O_F64, addToNoHelperNeeded("__mips16_unorddf2")); } MipsTargetLowering:: @@ -2754,6 +2779,155 @@ MipsTargetLowering::passArgOnStack(SDValue StackPtr, unsigned Offset, /*isVolatile=*/ true, false, 0); } +// +// The Mips16 hard float is a crazy quilt inherited from gcc. I have a much +// cleaner way to do all of this but it will have to wait until the traditional +// gcc mechanism is completed. +// +// For Pic, in order for Mips16 code to call Mips32 code which according the abi +// have either arguments or returned values placed in floating point registers, +// we use a set of helper functions. (This includes functions which return type +// complex which on Mips are returned in a pair of floating point registers). +// +// This is an encoding that we inherited from gcc. +// In Mips traditional O32, N32 ABI, floating point numbers are passed in +// floating point argument registers 1,2 only when the first and optionally +// the second arguments are float (sf) or double (df). +// For Mips16 we are only concerned with the situations where floating point +// arguments are being passed in floating point registers by the ABI, because +// Mips16 mode code cannot execute floating point instructions to load those +// values and hence helper functions are needed. +// The possibilities are (), (sf), (sf, sf), (sf, df), (df), (df, sf), (df, df) +// the helper function suffixs for these are: +// 0, 1, 5, 9, 2, 6, 10 +// this suffix can then be calculated as follows: +// for a given argument Arg: +// Arg1x, Arg2x = 1 : Arg is sf +// 2 : Arg is df +// 0: Arg is neither sf or df +// So this stub is the string for number Arg1x + Arg2x*4. +// However not all numbers between 0 and 10 are possible, we check anyway and +// assert if the impossible exists. +// + +unsigned int MipsTargetLowering::getMips16HelperFunctionStubNumber + (ArgListTy &Args) const { + unsigned int resultNum = 0; + if (Args.size() >= 1) { + Type *t = Args[0].Ty; + if (t->isFloatTy()) { + resultNum = 1; + } + else if (t->isDoubleTy()) { + resultNum = 2; + } + } + if (resultNum) { + if (Args.size() >=2) { + Type *t = Args[1].Ty; + if (t->isFloatTy()) { + resultNum += 4; + } + else if (t->isDoubleTy()) { + resultNum += 8; + } + } + } + return resultNum; +} + +// +// prefixs are attached to stub numbers depending on the return type . +// return type: float sf_ +// double df_ +// single complex sc_ +// double complext dc_ +// others NO PREFIX +// +// +// The full name of a helper function is__mips16_call_stub + +// return type dependent prefix + stub number +// +// +// This is something that probably should be in a different source file and +// perhaps done differently but my main purpose is to not waste runtime +// on something that we can enumerate in the source. Another possibility is +// to have a python script to generate these mapping tables. This will do +// for now. There are a whole series of helper function mapping arrays, one +// for each return type class as outlined above. There there are 11 possible +// entries. Ones with 0 are ones which should never be selected +// +// All the arrays are similar except for ones which return neither +// sf, df, sc, dc, in which only care about ones which have sf or df as a +// first parameter. +// +#define P_ "__mips16_call_stub_" +#define MAX_STUB_NUMBER 10 +#define T1 P "1", P "2", 0, 0, P "5", P "6", 0, 0, P "9", P "10" +#define T P "0" , T1 +#define P P_ +static char const * vMips16Helper[MAX_STUB_NUMBER+1] = + {0, T1 }; +#undef P +#define P P_ "sf_" +static char const * sfMips16Helper[MAX_STUB_NUMBER+1] = + { T }; +#undef P +#define P P_ "df_" +static char const * dfMips16Helper[MAX_STUB_NUMBER+1] = + { T }; +#undef P +#define P P_ "sc_" +static char const * scMips16Helper[MAX_STUB_NUMBER+1] = + { T }; +#undef P +#define P P_ "dc_" +static char const * dcMips16Helper[MAX_STUB_NUMBER+1] = + { T }; +#undef P +#undef P_ + + +const char* MipsTargetLowering:: + getMips16HelperFunction + (Type* RetTy, ArgListTy &Args, bool &needHelper) const { + const unsigned int maxStubNum = 10; + const bool validStubNum[maxStubNum+1] = + {true, true, true, false, false, true, true, false, false, true, true}; + const unsigned int stubNum = getMips16HelperFunctionStubNumber(Args); + assert(stubNum <= maxStubNum); + assert (validStubNum[stubNum]); + const char *result; + if (RetTy->isFloatTy()) { + result = sfMips16Helper[stubNum]; + } + else if (RetTy ->isDoubleTy()) { + result = dfMips16Helper[stubNum]; + } + else if (RetTy->isStructTy()) { + // check if it's complex + if (RetTy->getNumContainedTypes() == 2) { + if ((RetTy->getContainedType(0)->isFloatTy()) && + (RetTy->getContainedType(1)->isFloatTy())) { + result = scMips16Helper[stubNum]; + } + else if ((RetTy->getContainedType(0)->isDoubleTy()) && + (RetTy->getContainedType(1)->isDoubleTy())) { + result = dcMips16Helper[stubNum]; + } + } + } + else { + if (stubNum == 0) { + needHelper = false; + return ""; + } + result = vMips16Helper[stubNum]; + } + needHelper = true; + return result; +} + /// LowerCall - functions arguments are copied from virtual regs to /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted. SDValue @@ -2770,6 +2944,26 @@ MipsTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, CallingConv::ID CallConv = CLI.CallConv; bool isVarArg = CLI.IsVarArg; + const char* mips16HelperFunction = 0; + bool needMips16Helper = false; + + if (Subtarget->inMips16Mode() && getTargetMachine().Options.UseSoftFloat && + Mips16HardFloat) { + // + // currently we don't have symbols tagged with the mips16 or mips32 + // qualifier so we will assume that we don't know what kind it is. + // and generate the helper + // + bool lookupHelper = true; + if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) { + if (noHelperNeeded.find(S->getSymbol()) != noHelperNeeded.end()) { + lookupHelper = false; + } + } + if (lookupHelper) mips16HelperFunction = + getMips16HelperFunction(CLI.RetTy, CLI.Args, needMips16Helper); + + } MachineFunction &MF = DAG.getMachineFunction(); MachineFrameInfo *MFI = MF.getFrameInfo(); const TargetFrameLowering *TFL = MF.getTarget().getFrameLowering(); @@ -2934,10 +3128,19 @@ MipsTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, // -reloction-model=pic or it is an indirect call. if (IsPICCall || !GlobalOrExternal) { unsigned T9Reg = IsN64 ? Mips::T9_64 : Mips::T9; - RegsToPass.push_front(std::make_pair(T9Reg, Callee)); + unsigned V0Reg = Mips::V0; + if (needMips16Helper) { + RegsToPass.push_front(std::make_pair(V0Reg, Callee)); + JumpTarget = DAG.getExternalSymbol( + mips16HelperFunction, getPointerTy()); + JumpTarget = getAddrGlobal(JumpTarget, DAG, MipsII::MO_GOT); + } + else { + RegsToPass.push_front(std::make_pair(T9Reg, Callee)); - if (!Subtarget->inMips16Mode()) - JumpTarget = SDValue(); + if (!Subtarget->inMips16Mode()) + JumpTarget = SDValue(); + } } // Insert node "GP copy globalreg" before call to function. diff --git a/llvm/lib/Target/Mips/MipsISelLowering.h b/llvm/lib/Target/Mips/MipsISelLowering.h index deb6ad04634..c682c89f87c 100644 --- a/llvm/lib/Target/Mips/MipsISelLowering.h +++ b/llvm/lib/Target/Mips/MipsISelLowering.h @@ -21,6 +21,7 @@ #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/Target/TargetLowering.h" #include <deque> +#include <string> namespace llvm { namespace MipsISD { @@ -177,6 +178,12 @@ namespace llvm { void setMips16HardFloatLibCalls(); + unsigned int + getMips16HelperFunctionStubNumber(ArgListTy &Args) const; + + const char *getMips16HelperFunction + (Type* RetTy, ArgListTy &Args, bool &needHelper) const; + /// ByValArgInfo - Byval argument information. struct ByValArgInfo { unsigned FirstIdx; // Index of the first register used. |
