Index: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp =================================================================== --- lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -7694,36 +7694,59 @@ SDValue Val = RetValRegs.getCopyFromRegs(DAG, FuncInfo, getCurSDLoc(), Chain, &Flag, CS.getInstruction()); - // FIXME: Why don't we do this for inline asms with MRVs? - if (CS.getType()->isSingleValueType() && CS.getType()->isSized()) { - EVT ResultType = TLI.getValueType(DAG.getDataLayout(), CS.getType()); - - // If the type of the inline asm call site return value is different but - // has same size as the type of the asm output bitcast it. One example - // of this is for vectors with different width / number of elements. - // This can happen for register classes that can contain multiple - // different value types. The preg or vreg allocated may not have the - // same VT as was expected. - // - // This can also happen for a return value that disagrees with the - // register class it is put in, eg. a double in a general-purpose - // register on a 32-bit machine. - if (ResultType != Val.getValueType() && - ResultType.getSizeInBits() == Val.getValueSizeInBits()) { - Val = DAG.getNode(ISD::BITCAST, getCurSDLoc(), - ResultType, Val); - - } else if (ResultType != Val.getValueType() && - ResultType.isInteger() && Val.getValueType().isInteger()) { - // If a result value was tied to an input value, the computed result may - // have a wider width than the expected result. Extract the relevant - // portion. - Val = DAG.getNode(ISD::TRUNCATE, getCurSDLoc(), ResultType, Val); - } + llvm::Type *CSResultType = CS.getType(); + unsigned numRet; + ArrayRef ResultTypes; + SmallVector ResultValues(1); + if (CSResultType->isSingleValueType()) { + numRet = 1; + ResultValues[0] = Val; + ResultTypes = makeArrayRef(CSResultType); + } else { + numRet = CSResultType->getNumContainedTypes(); + assert(Val->getNumOperands() == numRet && + "Mismatch in number of output operands in asm result"); + ResultTypes = CSResultType->subtypes(); + ArrayRef ValueUses = Val->ops(); + ResultValues.resize(numRet); + std::transform(ValueUses.begin(), ValueUses.end(), ResultValues.begin(), + [](const SDUse &u) -> SDValue { return u.get(); }); + } + SmallVector ResultVTs(numRet); + for (unsigned i = 0; i < numRet; i++) { + EVT ResultVT = TLI.getValueType(DAG.getDataLayout(), ResultTypes[i]); + SDValue Val = ResultValues[i]; + if (ResultTypes[i]->isSized()) { + // If the type of the inline asm call site return value is different but + // has same size as the type of the asm output bitcast it. One example + // of this is for vectors with different width / number of elements. + // This can happen for register classes that can contain multiple + // different value types. The preg or vreg allocated may not have the + // same VT as was expected. + // + // This can also happen for a return value that disagrees with the + // register class it is put in, eg. a double in a general-purpose + // register on a 32-bit machine. + if (ResultVT != Val.getValueType() && + ResultVT.getSizeInBits() == Val.getValueSizeInBits()) { + Val = DAG.getNode(ISD::BITCAST, getCurSDLoc(), ResultVT, Val); + + } else if (ResultVT != Val.getValueType() && ResultVT.isInteger() && + Val.getValueType().isInteger()) { + // If a result value was tied to an input value, the computed result + // may have a wider width than the expected result. Extract the + // relevant portion. + Val = DAG.getNode(ISD::TRUNCATE, getCurSDLoc(), ResultVT, Val); + } - assert(ResultType == Val.getValueType() && "Asm result value mismatch!"); + assert(ResultVT == Val.getValueType() && "Asm result value mismatch!"); + } + ResultVTs[i] = ResultVT; + ResultValues[i] = Val; } + Val = DAG.getNode(ISD::MERGE_VALUES, getCurSDLoc(), + DAG.getVTList(ResultVTs), ResultValues); setValue(CS.getInstruction(), Val); // Don't need to use this as a chain in this case. if (!IA->hasSideEffects() && !hasMemory && IndirectStoresToEmit.empty()) Index: test/CodeGen/ARM/pr34170.ll =================================================================== --- test/CodeGen/ARM/pr34170.ll +++ test/CodeGen/ARM/pr34170.ll @@ -19,4 +19,20 @@ ret double %1 } +; Check support for returning several double in GPR +define double @zerobits_double_convoluted() #0 { +; CHECK-LABEL: zerobits_double_convoluted +; CHECK: mov r0, #0 +; CHECK-NEXT: mov r1, #0 +; CHECK-NEXT: mov r2, #0 +; CHECK-NEXT: mov r3, #0 +; CHECK: vmov {{d[[:digit:]]+}}, r2, r3 +; CHECK-NEXT: vmov {{d[[:digit:]]+}}, r0, r1 + %1 = call { double, double } asm "mov ${0:Q}, #0; mov ${0:R}, #0; mov ${1:Q}, #0; mov ${1:R}, #0", "=r,=r"() + %asmresult = extractvalue { double, double } %1, 0 + %asmresult1 = extractvalue { double, double } %1, 1 + %add = fadd double %asmresult, %asmresult1 + ret double %add +} + attributes #0 = { nounwind "target-features"="+d16,+vfp2,+vfp3,-fp-only-sp" }