diff options
| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-01-15 21:19:37 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-01-15 21:19:37 +0000 |
| commit | 5df5a22d1a098961edebac59fbddcab045fddd29 (patch) | |
| tree | d86546a4153bc4b3a6cbe2b482c9b5dff3284b17 /lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | |
| parent | 28f0ed5c9de4a68f34c0219d4ab83652c4647150 (diff) | |
| download | external_llvm-5df5a22d1a098961edebac59fbddcab045fddd29.zip external_llvm-5df5a22d1a098961edebac59fbddcab045fddd29.tar.gz external_llvm-5df5a22d1a098961edebac59fbddcab045fddd29.tar.bz2 | |
Add an assert so we don't silently miscompile ctpop for bit widths > 128.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123549 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/LegalizeDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index 3a29424..477cf09 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -2389,6 +2389,7 @@ SDValue SelectionDAGLegalize::ExpandBSWAP(SDValue Op, DebugLoc dl) { } /// SplatByte - Distribute ByteVal over NumBits bits. +// FIXME: Move this helper to a common place. static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) { APInt Val = APInt(NumBits, ByteVal); unsigned Shift = 8; @@ -2410,6 +2411,9 @@ SDValue SelectionDAGLegalize::ExpandBitCount(unsigned Opc, SDValue Op, EVT ShVT = TLI.getShiftAmountTy(); unsigned Len = VT.getSizeInBits(); + assert(VT.isInteger() && Len <= 128 && Len % 8 == 0 && + "CTPOP not implemented for this type."); + // This is the "best" algorithm from // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel |