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author | Eric Christopher <echristo@apple.com> | 2011-06-18 00:09:57 +0000 |
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committer | Eric Christopher <echristo@apple.com> | 2011-06-18 00:09:57 +0000 |
commit | a3071455e540530ecb644a2e59098129f70ce705 (patch) | |
tree | a51df0e3e0ceb2871401063337954c2c46a7a20f /lib | |
parent | ccfae86da1e78e5985bdc9d64d1116c539cf19ba (diff) | |
download | llvm-a3071455e540530ecb644a2e59098129f70ce705.tar.gz llvm-a3071455e540530ecb644a2e59098129f70ce705.tar.bz2 llvm-a3071455e540530ecb644a2e59098129f70ce705.tar.xz |
Fix UMULO support for 2x register width to allow the full
range without a libcall to a new mulo<mode> libcall
that we'd have to create.
Finishes the rest of rdar://9090077 and rdar://9210061
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133318 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp index 6797bece13..cbb8da8f18 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp @@ -2160,6 +2160,27 @@ void DAGTypeLegalizer::ExpandIntRes_XMULO(SDNode *N, const Type *PtrTy = PtrVT.getTypeForEVT(*DAG.getContext()); DebugLoc dl = N->getDebugLoc(); + // A divide for UMULO should be faster than a function call. + if (N->getOpcode() == ISD::UMULO) { + SDValue LHS = N->getOperand(0), RHS = N->getOperand(1); + DebugLoc DL = N->getDebugLoc(); + + SDValue MUL = DAG.getNode(ISD::MUL, DL, LHS.getValueType(), LHS, RHS); + SplitInteger(MUL, Lo, Hi); + + // A divide for UMULO will be faster than a function call. Select to + // make sure we aren't using 0. + SDValue isZero = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), + RHS, DAG.getConstant(0, VT), ISD::SETNE); + SDValue NotZero = DAG.getNode(ISD::SELECT, dl, VT, isZero, + DAG.getConstant(1, VT), RHS); + SDValue DIV = DAG.getNode(ISD::UDIV, DL, LHS.getValueType(), MUL, NotZero); + SDValue Overflow; + Overflow = DAG.getSetCC(DL, N->getValueType(1), DIV, LHS, ISD::SETNE); + ReplaceValueWith(SDValue(N, 1), Overflow); + return; + } + // Replace this with a libcall that will check overflow. RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL; if (VT == MVT::i32) |