diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index aac79075e6e..db355cf68f1 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2363,10 +2363,7 @@ void SelectionDAG::computeKnownBits(SDValue Op, KnownBits &Known, break; } - // Support big-endian targets when it becomes useful. bool IsLE = getDataLayout().isLittleEndian(); - if (!IsLE) - break; // Bitcast 'small element' vector to 'large element' scalar/vector. if ((BitWidth % SubBitWidth) == 0) { @@ -2385,8 +2382,9 @@ void SelectionDAG::computeKnownBits(SDValue Op, KnownBits &Known, for (unsigned i = 0; i != SubScale; ++i) { computeKnownBits(N0, Known2, SubDemandedElts.shl(i), Depth + 1); - Known.One |= Known2.One.zext(BitWidth).shl(SubBitWidth * i); - Known.Zero |= Known2.Zero.zext(BitWidth).shl(SubBitWidth * i); + unsigned Shifts = IsLE ? i : SubScale - 1 - i; + Known.One |= Known2.One.zext(BitWidth).shl(SubBitWidth * Shifts); + Known.Zero |= Known2.Zero.zext(BitWidth).shl(SubBitWidth * Shifts); } } @@ -2408,7 +2406,8 @@ void SelectionDAG::computeKnownBits(SDValue Op, KnownBits &Known, Known.Zero.setAllBits(); Known.One.setAllBits(); for (unsigned i = 0; i != NumElts; ++i) if (DemandedElts[i]) { - unsigned Offset = (i % SubScale) * BitWidth; + unsigned Shifts = IsLE ? i : NumElts - 1 - i; + unsigned Offset = (Shifts % SubScale) * BitWidth; Known.One &= Known2.One.lshr(Offset).trunc(BitWidth); Known.Zero &= Known2.Zero.lshr(Offset).trunc(BitWidth); // If we don't know any bits, early out. |
