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Add an assert so we don't silently miscompile ctpop for bit widths > 128.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123549 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-01-15 21:19:37 +00:00
parent 28f0ed5c9d
commit 5df5a22d1a
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -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