[llvm] r212772 - SelectionDAG: Factor FP_TO_SINT lower code out of DAGLegalizer
Jan Vesely
jan.vesely at rutgers.edu
Thu Jul 10 15:40:18 PDT 2014
Author: jvesely
Date: Thu Jul 10 17:40:18 2014
New Revision: 212772
URL: http://llvm.org/viewvc/llvm-project?rev=212772&view=rev
Log:
SelectionDAG: Factor FP_TO_SINT lower code out of DAGLegalizer
Move the code to a helper function to allow calls from TypeLegalizer.
No functionality change intended
Signed-off-by: Jan Vesely <jan.vesely at rutgers.edu>
Reviewed-by: Tom Stellard <tom at stellard.net>
Reviewed-by: Owen Anderson <resistor at mac.com>
Modified:
llvm/trunk/include/llvm/Target/TargetLowering.h
llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
Modified: llvm/trunk/include/llvm/Target/TargetLowering.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetLowering.h?rev=212772&r1=212771&r2=212772&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetLowering.h (original)
+++ llvm/trunk/include/llvm/Target/TargetLowering.h Thu Jul 10 17:40:18 2014
@@ -2564,6 +2564,12 @@ public:
SDValue LH = SDValue(), SDValue RL = SDValue(),
SDValue RH = SDValue()) const;
+ /// Expand float(f32) to SINT(i64) conversion
+ /// \param N Node to expand
+ /// \param Result output after conversion
+ /// \returns True, if the expansion was successful, false otherwise
+ bool expandFP_TO_SINT(SDNode *N, SDValue &Result, SelectionDAG &DAG) const;
+
//===--------------------------------------------------------------------===//
// Instruction Emitting Hooks
//
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp?rev=212772&r1=212771&r2=212772&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp Thu Jul 10 17:40:18 2014
@@ -3153,65 +3153,10 @@ void SelectionDAGLegalize::ExpandNode(SD
Node->getOperand(0), Node->getValueType(0), dl);
Results.push_back(Tmp1);
break;
- case ISD::FP_TO_SINT: {
- EVT VT = Node->getOperand(0).getValueType();
- EVT NVT = Node->getValueType(0);
-
- // FIXME: Only f32 to i64 conversions are supported.
- if (VT != MVT::f32 || NVT != MVT::i64)
- break;
-
- // Expand f32 -> i64 conversion
- // This algorithm comes from compiler-rt's implementation of fixsfdi:
- // https://github.com/llvm-mirror/compiler-rt/blob/master/lib/builtins/fixsfdi.c
- EVT IntVT = EVT::getIntegerVT(*DAG.getContext(),
- VT.getSizeInBits());
- SDValue ExponentMask = DAG.getConstant(0x7F800000, IntVT);
- SDValue ExponentLoBit = DAG.getConstant(23, IntVT);
- SDValue Bias = DAG.getConstant(127, IntVT);
- SDValue SignMask = DAG.getConstant(APInt::getSignBit(VT.getSizeInBits()),
- IntVT);
- SDValue SignLowBit = DAG.getConstant(VT.getSizeInBits() - 1, IntVT);
- SDValue MantissaMask = DAG.getConstant(0x007FFFFF, IntVT);
-
- SDValue Bits = DAG.getNode(ISD::BITCAST, dl, IntVT, Node->getOperand(0));
-
- SDValue ExponentBits = DAG.getNode(ISD::SRL, dl, IntVT,
- DAG.getNode(ISD::AND, dl, IntVT, Bits, ExponentMask),
- DAG.getZExtOrTrunc(ExponentLoBit, dl, TLI.getShiftAmountTy(IntVT)));
- SDValue Exponent = DAG.getNode(ISD::SUB, dl, IntVT, ExponentBits, Bias);
-
- SDValue Sign = DAG.getNode(ISD::SRA, dl, IntVT,
- DAG.getNode(ISD::AND, dl, IntVT, Bits, SignMask),
- DAG.getZExtOrTrunc(SignLowBit, dl, TLI.getShiftAmountTy(IntVT)));
- Sign = DAG.getSExtOrTrunc(Sign, dl, NVT);
-
- SDValue R = DAG.getNode(ISD::OR, dl, IntVT,
- DAG.getNode(ISD::AND, dl, IntVT, Bits, MantissaMask),
- DAG.getConstant(0x00800000, IntVT));
-
- R = DAG.getZExtOrTrunc(R, dl, NVT);
-
-
- R = DAG.getSelectCC(dl, Exponent, ExponentLoBit,
- DAG.getNode(ISD::SHL, dl, NVT, R,
- DAG.getZExtOrTrunc(
- DAG.getNode(ISD::SUB, dl, IntVT, Exponent, ExponentLoBit),
- dl, TLI.getShiftAmountTy(IntVT))),
- DAG.getNode(ISD::SRL, dl, NVT, R,
- DAG.getZExtOrTrunc(
- DAG.getNode(ISD::SUB, dl, IntVT, ExponentLoBit, Exponent),
- dl, TLI.getShiftAmountTy(IntVT))),
- ISD::SETGT);
-
- SDValue Ret = DAG.getNode(ISD::SUB, dl, NVT,
- DAG.getNode(ISD::XOR, dl, NVT, R, Sign),
- Sign);
-
- Results.push_back(DAG.getSelectCC(dl, Exponent, DAG.getConstant(0, IntVT),
- DAG.getConstant(0, NVT), Ret, ISD::SETLT));
+ case ISD::FP_TO_SINT:
+ if (TLI.expandFP_TO_SINT(Node, Tmp1, DAG))
+ Results.push_back(Tmp1);
break;
- }
case ISD::FP_TO_UINT: {
SDValue True, False;
EVT VT = Node->getOperand(0).getValueType();
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp?rev=212772&r1=212771&r2=212772&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp Thu Jul 10 17:40:18 2014
@@ -2885,3 +2885,65 @@ bool TargetLowering::expandMUL(SDNode *N
}
return false;
}
+
+bool TargetLowering::expandFP_TO_SINT(SDNode *Node, SDValue &Result,
+ SelectionDAG &DAG) const {
+ EVT VT = Node->getOperand(0).getValueType();
+ EVT NVT = Node->getValueType(0);
+ SDLoc dl(SDValue(Node, 0));
+
+ // FIXME: Only f32 to i64 conversions are supported.
+ if (VT != MVT::f32 || NVT != MVT::i64)
+ return false;
+
+ // Expand f32 -> i64 conversion
+ // This algorithm comes from compiler-rt's implementation of fixsfdi:
+ // https://github.com/llvm-mirror/compiler-rt/blob/master/lib/builtins/fixsfdi.c
+ EVT IntVT = EVT::getIntegerVT(*DAG.getContext(),
+ VT.getSizeInBits());
+ SDValue ExponentMask = DAG.getConstant(0x7F800000, IntVT);
+ SDValue ExponentLoBit = DAG.getConstant(23, IntVT);
+ SDValue Bias = DAG.getConstant(127, IntVT);
+ SDValue SignMask = DAG.getConstant(APInt::getSignBit(VT.getSizeInBits()),
+ IntVT);
+ SDValue SignLowBit = DAG.getConstant(VT.getSizeInBits() - 1, IntVT);
+ SDValue MantissaMask = DAG.getConstant(0x007FFFFF, IntVT);
+
+ SDValue Bits = DAG.getNode(ISD::BITCAST, dl, IntVT, Node->getOperand(0));
+
+ SDValue ExponentBits = DAG.getNode(ISD::SRL, dl, IntVT,
+ DAG.getNode(ISD::AND, dl, IntVT, Bits, ExponentMask),
+ DAG.getZExtOrTrunc(ExponentLoBit, dl, getShiftAmountTy(IntVT)));
+ SDValue Exponent = DAG.getNode(ISD::SUB, dl, IntVT, ExponentBits, Bias);
+
+ SDValue Sign = DAG.getNode(ISD::SRA, dl, IntVT,
+ DAG.getNode(ISD::AND, dl, IntVT, Bits, SignMask),
+ DAG.getZExtOrTrunc(SignLowBit, dl, getShiftAmountTy(IntVT)));
+ Sign = DAG.getSExtOrTrunc(Sign, dl, NVT);
+
+ SDValue R = DAG.getNode(ISD::OR, dl, IntVT,
+ DAG.getNode(ISD::AND, dl, IntVT, Bits, MantissaMask),
+ DAG.getConstant(0x00800000, IntVT));
+
+ R = DAG.getZExtOrTrunc(R, dl, NVT);
+
+
+ R = DAG.getSelectCC(dl, Exponent, ExponentLoBit,
+ DAG.getNode(ISD::SHL, dl, NVT, R,
+ DAG.getZExtOrTrunc(
+ DAG.getNode(ISD::SUB, dl, IntVT, Exponent, ExponentLoBit),
+ dl, getShiftAmountTy(IntVT))),
+ DAG.getNode(ISD::SRL, dl, NVT, R,
+ DAG.getZExtOrTrunc(
+ DAG.getNode(ISD::SUB, dl, IntVT, ExponentLoBit, Exponent),
+ dl, getShiftAmountTy(IntVT))),
+ ISD::SETGT);
+
+ SDValue Ret = DAG.getNode(ISD::SUB, dl, NVT,
+ DAG.getNode(ISD::XOR, dl, NVT, R, Sign),
+ Sign);
+
+ Result = DAG.getSelectCC(dl, Exponent, DAG.getConstant(0, IntVT),
+ DAG.getConstant(0, NVT), Ret, ISD::SETLT);
+ return true;
+}
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