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Properly expand libcalls for urem / srem. Also make code more straightforward.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71238 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-05-08 18:51:08 +00:00
parent fb3f84fe16
commit 58c04e1496
1 changed files with 40 additions and 29 deletions
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69
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3564,36 +3564,47 @@ SDValue SelectionDAGLegalize::LegalizeOp(SDValue Op) {
break;
}
if (VT.isInteger()) {
if (TLI.getOperationAction(DivOpc, VT) ==
TargetLowering::Legal) {
// X % Y -> X-X/Y*Y
Result = DAG.getNode(DivOpc, dl, VT, Tmp1, Tmp2);
Result = DAG.getNode(ISD::MUL, dl, VT, Result, Tmp2);
Result = DAG.getNode(ISD::SUB, dl, VT, Tmp1, Result);
} else if (VT.isVector()) {
Result = LegalizeOp(UnrollVectorOp(Op));
} else {
assert(VT == MVT::i32 &&
"Cannot expand this binary operator!");
RTLIB::Libcall LC = Node->getOpcode() == ISD::UREM
? RTLIB::UREM_I32 : RTLIB::SREM_I32;
SDValue Dummy;
Result = ExpandLibCall(LC, Node, isSigned, Dummy);
}
} else {
assert(VT.isFloatingPoint() &&
"remainder op must have integer or floating-point type");
if (VT.isVector()) {
Result = LegalizeOp(UnrollVectorOp(Op));
} else {
// Floating point mod -> fmod libcall.
RTLIB::Libcall LC = GetFPLibCall(VT, RTLIB::REM_F32, RTLIB::REM_F64,
RTLIB::REM_F80, RTLIB::REM_PPCF128);
SDValue Dummy;
Result = ExpandLibCall(LC, Node, false/*sign irrelevant*/, Dummy);
}
if (VT.isInteger() &&
TLI.getOperationAction(DivOpc, VT) == TargetLowering::Legal) {
// X % Y -> X-X/Y*Y
Result = DAG.getNode(DivOpc, dl, VT, Tmp1, Tmp2);
Result = DAG.getNode(ISD::MUL, dl, VT, Result, Tmp2);
Result = DAG.getNode(ISD::SUB, dl, VT, Tmp1, Result);
break;
}
// Check to see if we have a libcall for this operator.
RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
switch (Node->getOpcode()) {
default: break;
case ISD::UREM:
case ISD::SREM:
if (VT == MVT::i16)
LC = (isSigned ? RTLIB::SREM_I16 : RTLIB::UREM_I16);
else if (VT == MVT::i32)
LC = (isSigned ? RTLIB::SREM_I32 : RTLIB::UREM_I32);
else if (VT == MVT::i64)
LC = (isSigned ? RTLIB::SREM_I64 : RTLIB::UREM_I64);
else if (VT == MVT::i128)
LC = (isSigned ? RTLIB::SREM_I128 : RTLIB::UREM_I128);
break;
case ISD::FREM:
// Floating point mod -> fmod libcall.
LC = GetFPLibCall(VT, RTLIB::REM_F32, RTLIB::REM_F64,
RTLIB::REM_F80, RTLIB::REM_PPCF128);
break;
}
if (LC != RTLIB::UNKNOWN_LIBCALL) {
SDValue Dummy;
Result = ExpandLibCall(LC, Node, isSigned, Dummy);
break;
}
assert(VT.isVector() &&
"Cannot expand this binary operator!");
// Expand the operation into a bunch of nasty scalar code.
Result = LegalizeOp(UnrollVectorOp(Op));
break;
}
}