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//===--- CGArrayIntrinsics.cpp - Emit LLVM Code for Array intrinsics -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Array intrinsic functions.
//
//===----------------------------------------------------------------------===//
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "CGArray.h"
#include "flang/AST/ASTContext.h"
#include "flang/AST/ExprVisitor.h"
#include "flang/AST/StmtVisitor.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
namespace flang {
namespace CodeGen {
RValueTy CodeGenFunction::
EmitVectorDimReturningScalarArrayIntrinsic(intrinsic::FunctionKind Func,
Expr *Arr) {
using namespace intrinsic;
auto ElementType = Arr->getType()->asArrayType()->getElementType();
switch(Func) {
case MAXLOC:
case MINLOC: {
auto Result = CreateTempAlloca(CGM.SizeTy, "maxminloc-result");
auto MaxMinVar = CreateTempAlloca(ConvertTypeForMem(ElementType), "maxminloc-var");
Builder.CreateStore(llvm::ConstantInt::get(CGM.SizeTy, 0), Result);
if(Func == MAXLOC)
Builder.CreateStore(GetConstantScalarMinValue(ElementType), MaxMinVar);
else
Builder.CreateStore(GetConstantScalarMaxValue(ElementType), MaxMinVar);
ArrayOperation OP;
StandaloneArrayValueSectionGatherer Gatherer(*this, OP);
Gatherer.EmitExpr(Arr);
OP.EmitAllScalarValuesAndArraySections(*this, Arr);
ArrayLoopEmitter Looper(*this);
Looper.EmitArrayIterationBegin(Gatherer.getResult());
ArrayOperationEmitter EV(*this, OP, Looper);
auto ElementValue = EV.Emit(Arr).asScalar();
auto ResultValue = Builder.CreateLoad(MaxMinVar);
auto ThenBlock = createBasicBlock("maxminloc-then");
auto EndBlock = createBasicBlock("maxminloc-end");
Builder.CreateCondBr(EmitScalarBinaryExpr(Func == MAXLOC? BinaryExpr::GreaterThan : BinaryExpr::LessThan,
ElementValue, ResultValue),
ThenBlock, EndBlock);
EmitBlock(ThenBlock);
Builder.CreateStore(ElementValue, MaxMinVar);
Builder.CreateStore(Looper.EmitElementOneDimensionalIndex(Gatherer.getResult()), Result);
EmitBranch(EndBlock);
EmitBlock(EndBlock);
Looper.EmitArrayIterationEnd();
return EmitScalarToScalarConversion(Builder.CreateLoad(Result),
getContext().IntegerTy);
}
default:
llvm_unreachable("invalid intrinsic");
break;
}
return RValueTy();
}
RValueTy CodeGenFunction::EmitArrayIntrinsic(intrinsic::FunctionKind Func,
ArrayRef<Expr*> Arguments) {
using namespace intrinsic;
switch(Func) {
case MAXLOC:
case MINLOC:
if(Arguments.size() == 2 &&
Arguments[0]->getType()->asArrayType()->getDimensionCount() == 1 &&
Arguments[1]->getType()->isIntegerType()) {
// Vector, dim -> return scalar
return EmitVectorDimReturningScalarArrayIntrinsic(Func,
Arguments.front());
}
llvm_unreachable("FIXME: add codegen for the rest");
break;
default:
llvm_unreachable("invalid intrinsic");
break;
}
return RValueTy();
}
}
} // end namespace flang
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