#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblySubtarget.h"
#include "WebAssemblyTargetMachine.h"
-#include "WebAssemblyTargetObjectFile.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
ISD::SETULT, ISD::SETULE, ISD::SETUGT, ISD::SETUGE})
setCondCodeAction(CC, T, Expand);
// Expand floating-point library function operators.
- for (auto Op : {ISD::FSIN, ISD::FCOS, ISD::FSINCOS, ISD::FPOWI, ISD::FPOW})
+ for (auto Op : {ISD::FSIN, ISD::FCOS, ISD::FSINCOS, ISD::FPOWI, ISD::FPOW,
+ ISD::FREM, ISD::FMA})
setOperationAction(Op, T, Expand);
// Note supported floating-point library function operators that otherwise
// default to expand.
// As a special case, these operators use the type to mean the type to
// sign-extend from.
- for (auto T : {MVT::i1, MVT::i8, MVT::i16})
+ for (auto T : {MVT::i1, MVT::i8, MVT::i16, MVT::i32})
setOperationAction(ISD::SIGN_EXTEND_INREG, T, Expand);
// Dynamic stack allocation: use the default expansion.
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVTPtr, Expand);
+ setOperationAction(ISD::FrameIndex, MVT::i32, Custom);
+
// Expand these forms; we pattern-match the forms that we can handle in isel.
for (auto T : {MVT::i32, MVT::i64, MVT::f32, MVT::f64})
for (auto Op : {ISD::BR_CC, ISD::SELECT_CC})
// - Floating-point extending loads.
// - Floating-point truncating stores.
// - i1 extending loads.
- setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f64, Expand);
+ setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f32, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
for (auto T : MVT::integer_valuetypes())
for (auto Ext : {ISD::EXTLOAD, ISD::ZEXTLOAD, ISD::SEXTLOAD})
bool WebAssemblyTargetLowering::isOffsetFoldingLegal(
const GlobalAddressSDNode * /*GA*/) const {
- // The WebAssembly target doesn't support folding offsets into global
- // addresses.
- return false;
+ // All offsets can be folded.
+ return true;
}
MVT WebAssemblyTargetLowering::getScalarShiftAmountTy(const DataLayout & /*DL*/,
EVT VT) const {
- return VT.getSimpleVT();
+ unsigned BitWidth = NextPowerOf2(VT.getSizeInBits() - 1);
+ if (BitWidth > 1 && BitWidth < 8)
+ BitWidth = 8;
+
+ if (BitWidth > 64) {
+ BitWidth = 64;
+ assert(BitWidth >= Log2_32_Ceil(VT.getSizeInBits()) &&
+ "64-bit shift counts ought to be enough for anyone");
+ }
+
+ MVT Result = MVT::getIntegerVT(BitWidth);
+ assert(Result != MVT::INVALID_SIMPLE_VALUE_TYPE &&
+ "Unable to represent scalar shift amount type");
+ return Result;
}
const char *
if (Constraint.size() == 1) {
switch (Constraint[0]) {
case 'r':
- if (VT == MVT::i32)
- return std::make_pair(0U, &WebAssembly::I32RegClass);
- if (VT == MVT::i64)
- return std::make_pair(0U, &WebAssembly::I64RegClass);
+ assert(VT != MVT::iPTR && "Pointer MVT not expected here");
+ if (VT.isInteger() && !VT.isVector()) {
+ if (VT.getSizeInBits() <= 32)
+ return std::make_pair(0U, &WebAssembly::I32RegClass);
+ if (VT.getSizeInBits() <= 64)
+ return std::make_pair(0U, &WebAssembly::I64RegClass);
+ }
break;
default:
break;
return true;
}
+bool WebAssemblyTargetLowering::isLegalAddressingMode(const DataLayout &DL,
+ const AddrMode &AM,
+ Type *Ty,
+ unsigned AS) const {
+ // WebAssembly offsets are added as unsigned without wrapping. The
+ // isLegalAddressingMode gives us no way to determine if wrapping could be
+ // happening, so we approximate this by accepting only non-negative offsets.
+ if (AM.BaseOffs < 0)
+ return false;
+
+ // WebAssembly has no scale register operands.
+ if (AM.Scale != 0)
+ return false;
+
+ // Everything else is legal.
+ return true;
+}
+
//===----------------------------------------------------------------------===//
// WebAssembly Lowering private implementation.
//===----------------------------------------------------------------------===//
SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
for (const ISD::OutputArg &Out : Outs) {
- assert(!Out.Flags.isByVal() && "byval is not valid for return values");
- assert(!Out.Flags.isNest() && "nest is not valid for return values");
+ if (Out.Flags.isByVal())
+ fail(DL, DAG, "WebAssembly hasn't implemented byval arguments");
+ if (Out.Flags.isNest())
+ fail(DL, DAG, "WebAssembly hasn't implemented nest arguments");
if (Out.Flags.isInAlloca())
- fail(DL, DAG, "WebAssembly hasn't implemented inalloca results");
+ fail(DL, DAG, "WebAssembly hasn't implemented inalloca arguments");
if (Out.Flags.isInConsecutiveRegs())
- fail(DL, DAG, "WebAssembly hasn't implemented cons regs results");
+ fail(DL, DAG, "WebAssembly hasn't implemented cons regs arguments");
if (Out.Flags.isInConsecutiveRegsLast())
- fail(DL, DAG, "WebAssembly hasn't implemented cons regs last results");
+ fail(DL, DAG, "WebAssembly hasn't implemented cons regs last arguments");
}
bool IsVarArg = CLI.IsVarArg;
unsigned NumBytes = CCInfo.getAlignedCallFrameSize();
- auto NB = DAG.getConstant(NumBytes, DL, PtrVT, true);
- Chain = DAG.getCALLSEQ_START(Chain, NB, DL);
+ SDValue NB;
+ if (NumBytes) {
+ NB = DAG.getConstant(NumBytes, DL, PtrVT, true);
+ Chain = DAG.getCALLSEQ_START(Chain, NB, DL);
+ }
if (IsVarArg) {
// For non-fixed arguments, next emit stores to store the argument values
SmallVector<EVT, 8> Tys;
for (const auto &In : Ins) {
- if (In.Flags.isByVal())
- fail(DL, DAG, "WebAssembly hasn't implemented byval arguments");
+ assert(!In.Flags.isByVal() && "byval is not valid for return values");
+ assert(!In.Flags.isNest() && "nest is not valid for return values");
if (In.Flags.isInAlloca())
- fail(DL, DAG, "WebAssembly hasn't implemented inalloca arguments");
- if (In.Flags.isNest())
- fail(DL, DAG, "WebAssembly hasn't implemented nest arguments");
+ fail(DL, DAG, "WebAssembly hasn't implemented inalloca return values");
if (In.Flags.isInConsecutiveRegs())
- fail(DL, DAG, "WebAssembly hasn't implemented cons regs arguments");
+ fail(DL, DAG, "WebAssembly hasn't implemented cons regs return values");
if (In.Flags.isInConsecutiveRegsLast())
- fail(DL, DAG, "WebAssembly hasn't implemented cons regs last arguments");
+ fail(DL, DAG,
+ "WebAssembly hasn't implemented cons regs last return values");
// Ignore In.getOrigAlign() because all our arguments are passed in
// registers.
Tys.push_back(In.VT);
Chain = Res.getValue(1);
}
- SDValue Unused = DAG.getUNDEF(PtrVT);
- Chain = DAG.getCALLSEQ_END(Chain, NB, Unused, SDValue(), DL);
+ if (NumBytes) {
+ SDValue Unused = DAG.getTargetConstant(0, DL, PtrVT);
+ Chain = DAG.getCALLSEQ_END(Chain, NB, Unused, SDValue(), DL);
+ }
return Chain;
}
default:
llvm_unreachable("unimplemented operation lowering");
return SDValue();
+ case ISD::FrameIndex:
+ return LowerFrameIndex(Op, DAG);
case ISD::GlobalAddress:
return LowerGlobalAddress(Op, DAG);
case ISD::ExternalSymbol:
}
}
+SDValue WebAssemblyTargetLowering::LowerFrameIndex(SDValue Op,
+ SelectionDAG &DAG) const {
+ int FI = cast<FrameIndexSDNode>(Op)->getIndex();
+ return DAG.getTargetFrameIndex(FI, Op.getValueType());
+}
+
SDValue WebAssemblyTargetLowering::LowerGlobalAddress(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
const auto *GA = cast<GlobalAddressSDNode>(Op);
EVT VT = Op.getValueType();
- assert(GA->getOffset() == 0 &&
- "offsets on global addresses are forbidden by isOffsetFoldingLegal");
- assert(GA->getTargetFlags() == 0 && "WebAssembly doesn't set target flags");
+ assert(GA->getTargetFlags() == 0 &&
+ "Unexpected target flags on generic GlobalAddressSDNode");
if (GA->getAddressSpace() != 0)
fail(DL, DAG, "WebAssembly only expects the 0 address space");
- return DAG.getNode(WebAssemblyISD::Wrapper, DL, VT,
- DAG.getTargetGlobalAddress(GA->getGlobal(), DL, VT));
+ return DAG.getNode(
+ WebAssemblyISD::Wrapper, DL, VT,
+ DAG.getTargetGlobalAddress(GA->getGlobal(), DL, VT, GA->getOffset()));
}
SDValue
SDLoc DL(Op);
const auto *ES = cast<ExternalSymbolSDNode>(Op);
EVT VT = Op.getValueType();
- assert(ES->getTargetFlags() == 0 && "WebAssembly doesn't set target flags");
+ assert(ES->getTargetFlags() == 0 &&
+ "Unexpected target flags on generic ExternalSymbolSDNode");
+ // Set the TargetFlags to 0x1 which indicates that this is a "function"
+ // symbol rather than a data symbol. We do this unconditionally even though
+ // we don't know anything about the symbol other than its name, because all
+ // external symbols used in target-independent SelectionDAG code are for
+ // functions.
return DAG.getNode(WebAssemblyISD::Wrapper, DL, VT,
- DAG.getTargetExternalSymbol(ES->getSymbol(), VT));
+ DAG.getTargetExternalSymbol(ES->getSymbol(), VT,
+ /*TargetFlags=*/0x1));
}
SDValue WebAssemblyTargetLowering::LowerJumpTable(SDValue Op,
// the current frame pointer.
DAG.getMachineFunction().getFrameInfo()->setFrameAddressIsTaken(true);
unsigned FP =
- static_cast<const WebAssemblyRegisterInfo *>(Subtarget->getRegisterInfo())
- ->getFrameRegister(DAG.getMachineFunction());
+ Subtarget->getRegisterInfo()->getFrameRegister(DAG.getMachineFunction());
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), DL, FP, PtrVT);
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
return DAG.getStore(Op.getOperand(0), DL, FrameAddr, Op.getOperand(1),
//===----------------------------------------------------------------------===//
// WebAssembly Optimization Hooks
//===----------------------------------------------------------------------===//
-
-MCSection *WebAssemblyTargetObjectFile::SelectSectionForGlobal(
- const GlobalValue *GV, SectionKind /*Kind*/, Mangler & /*Mang*/,
- const TargetMachine & /*TM*/) const {
- // TODO: Be more sophisticated than this.
- return isa<Function>(GV) ? getTextSection() : getDataSection();
-}
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