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//===-- LegalizeTypesFloatToInt.cpp - LegalizeTypes float to int support --===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements float to integer conversion for LegalizeTypes. This
// is the act of turning a computation in an invalid floating point type into
// a computation in an integer type of the same size. For example, turning
// f32 arithmetic into operations using i32. Also known as "soft float".
//
//===----------------------------------------------------------------------===//
#include "LegalizeTypes.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Result Float to Integer Conversion.
//===----------------------------------------------------------------------===//
void DAGTypeLegalizer::FloatToIntResult(SDNode *N, unsigned ResNo) {
DEBUG(cerr << "FloatToInt node result " << ResNo << ": "; N->dump(&DAG);
cerr << "\n");
SDOperand R = SDOperand();
// FIXME: Custom lowering for float-to-int?
#if 0
// See if the target wants to custom convert this node to an integer.
if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
TargetLowering::Custom) {
// If the target wants to, allow it to lower this itself.
if (SDNode *P = TLI.FloatToIntOperationResult(N, DAG)) {
// Everything that once used N now uses P. We are guaranteed that the
// result value types of N and the result value types of P match.
ReplaceNodeWith(N, P);
return;
}
}
#endif
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
cerr << "FloatToIntResult #" << ResNo << ": ";
N->dump(&DAG); cerr << "\n";
#endif
assert(0 && "Do not know how to convert the result of this operator!");
abort();
case ISD::BIT_CONVERT: R = FloatToIntRes_BIT_CONVERT(N); break;
case ISD::BUILD_PAIR: R = FloatToIntRes_BUILD_PAIR(N); break;
case ISD::FCOPYSIGN: R = FloatToIntRes_FCOPYSIGN(N); break;
case ISD::LOAD: R = FloatToIntRes_LOAD(N); break;
}
// If R is null, the sub-method took care of registering the result.
if (R.Val)
SetIntegerOp(SDOperand(N, ResNo), R);
}
SDOperand DAGTypeLegalizer::FloatToIntRes_BIT_CONVERT(SDNode *N) {
return BitConvertToInteger(N->getOperand(0));
}
SDOperand DAGTypeLegalizer::FloatToIntRes_BUILD_PAIR(SDNode *N) {
// Convert the inputs to integers, and build a new pair out of them.
return DAG.getNode(ISD::BUILD_PAIR,
TLI.getTypeToTransformTo(N->getValueType(0)),
BitConvertToInteger(N->getOperand(0)),
BitConvertToInteger(N->getOperand(1)));
}
SDOperand DAGTypeLegalizer::FloatToIntRes_FCOPYSIGN(SDNode *N) {
SDOperand LHS = GetIntegerOp(N->getOperand(0));
SDOperand RHS = BitConvertToInteger(N->getOperand(1));
MVT::ValueType LVT = LHS.getValueType();
MVT::ValueType RVT = RHS.getValueType();
unsigned LSize = MVT::getSizeInBits(LVT);
unsigned RSize = MVT::getSizeInBits(RVT);
// First get the sign bit of second operand.
SDOperand SignBit = DAG.getNode(ISD::SHL, RVT, DAG.getConstant(1, RVT),
DAG.getConstant(RSize - 1,
TLI.getShiftAmountTy()));
SignBit = DAG.getNode(ISD::AND, RVT, RHS, SignBit);
// Shift right or sign-extend it if the two operands have different types.
int SizeDiff = MVT::getSizeInBits(RVT) - MVT::getSizeInBits(LVT);
if (SizeDiff > 0) {
SignBit = DAG.getNode(ISD::SRL, RVT, SignBit,
DAG.getConstant(SizeDiff, TLI.getShiftAmountTy()));
SignBit = DAG.getNode(ISD::TRUNCATE, LVT, SignBit);
} else if (SizeDiff < 0) {
SignBit = DAG.getNode(ISD::ANY_EXTEND, LVT, SignBit);
SignBit = DAG.getNode(ISD::SHL, LVT, SignBit,
DAG.getConstant(-SizeDiff, TLI.getShiftAmountTy()));
}
// Clear the sign bit of the first operand.
SDOperand Mask = DAG.getNode(ISD::SHL, LVT, DAG.getConstant(1, LVT),
DAG.getConstant(LSize - 1,
TLI.getShiftAmountTy()));
Mask = DAG.getNode(ISD::SUB, LVT, Mask, DAG.getConstant(1, LVT));
LHS = DAG.getNode(ISD::AND, LVT, LHS, Mask);
// Or the value with the sign bit.
return DAG.getNode(ISD::OR, LVT, LHS, SignBit);
}
SDOperand DAGTypeLegalizer::FloatToIntRes_LOAD(SDNode *N) {
MVT::ValueType NVT = TLI.getTypeToTransformTo(N->getValueType(0));
LoadSDNode *L = cast<LoadSDNode>(N);
return DAG.getAnyLoad(L->getAddressingMode(), L->getExtensionType(),
NVT, L->getChain(), L->getBasePtr(), L->getOffset(),
L->getSrcValue(), L->getSrcValueOffset(),
L->getMemoryVT(), L->isVolatile(), L->getAlignment());
}
//===----------------------------------------------------------------------===//
// Operand Float to Integer Conversion..
//===----------------------------------------------------------------------===//
bool DAGTypeLegalizer::FloatToIntOperand(SDNode *N, unsigned OpNo) {
DEBUG(cerr << "FloatToInt node operand " << OpNo << ": "; N->dump(&DAG);
cerr << "\n");
SDOperand Res(0, 0);
// FIXME: Custom lowering for float-to-int?
#if 0
if (TLI.getOperationAction(N->getOpcode(), N->getOperand(OpNo).getValueType())
== TargetLowering::Custom)
Res = TLI.LowerOperation(SDOperand(N, 0), DAG);
#endif
if (Res.Val == 0) {
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
cerr << "FloatToIntOperand Op #" << OpNo << ": ";
N->dump(&DAG); cerr << "\n";
#endif
assert(0 && "Do not know how to convert this operator's operand!");
abort();
case ISD::BIT_CONVERT: Res = FloatToIntOp_BIT_CONVERT(N); break;
}
}
// If the result is null, the sub-method took care of registering results etc.
if (!Res.Val) return false;
// If the result is N, the sub-method updated N in place. Check to see if any
// operands are new, and if so, mark them.
if (Res.Val == N) {
// Mark N as new and remark N and its operands. This allows us to correctly
// revisit N if it needs another step of promotion and allows us to visit
// any new operands to N.
ReanalyzeNode(N);
return true;
}
assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
"Invalid operand expansion");
ReplaceValueWith(SDOperand(N, 0), Res);
return false;
}
SDOperand DAGTypeLegalizer::FloatToIntOp_BIT_CONVERT(SDNode *N) {
return DAG.getNode(ISD::BIT_CONVERT, N->getValueType(0),
GetIntegerOp(N->getOperand(0)));
}
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