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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-06-03 13:02:07 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-06-03 13:02:07 +0000 |
| commit | cb7e4e8193f3504073932f9e9337fec6ab7675df (patch) | |
| tree | bedcf81468a20eed4e0f8629042693214094b953 /llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | 74467814f27e3da681a4faaf3edbaeb493a036b6 (diff) | |
| download | bcm5719-llvm-cb7e4e8193f3504073932f9e9337fec6ab7675df.tar.gz bcm5719-llvm-cb7e4e8193f3504073932f9e9337fec6ab7675df.zip | |
[SelectionDAG] Add [us]itofp(undef) --> 0 constant fold (PR39205)
We were missing this fold in the DAG, which I've copied directly from llvm::ConstantFoldCastInstruction
Differential Revision: https://reviews.llvm.org/D62807
llvm-svn: 362397
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index d6d8cf54cb0..1dc9d7460f8 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -4440,6 +4440,12 @@ SDValue SelectionDAG::getNode(unsigned Opcode, const SDLoc &DL, EVT VT, if (Operand.isUndef()) return getUNDEF(VT); break; + case ISD::SINT_TO_FP: + case ISD::UINT_TO_FP: + // [us]itofp(undef) = 0, because the result value is bounded. + if (Operand.isUndef()) + return getConstantFP(0.0, DL, VT); + break; case ISD::SIGN_EXTEND: assert(VT.isInteger() && Operand.getValueType().isInteger() && "Invalid SIGN_EXTEND!"); |
