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Revert r106263, "Fold the ShrinkDemandedOps pass into the regular DAGCombiner pass,"... it was causing both 'file' (with clang) and 176.gcc (with llvm-gcc) to be miscompiled.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106634 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-06-23 17:09:26 +00:00
parent f1ab49e83a
commit cbe762b5d1
9 changed files with 119 additions and 62 deletions
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8
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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@@ -1075,7 +1075,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
if (TLO.ShrinkDemandedConstant(Op, ~KnownZero2 & NewMask))
return true;
// If the operation can be done in a smaller type, do so.
if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
if (TLO.ShrinkOps && TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
return true;
// Output known-1 bits are only known if set in both the LHS & RHS.
@@ -1109,7 +1109,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
if (TLO.ShrinkDemandedConstant(Op, NewMask))
return true;
// If the operation can be done in a smaller type, do so.
if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
if (TLO.ShrinkOps && TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
return true;
// Output known-0 bits are only known if clear in both the LHS & RHS.
@@ -1134,7 +1134,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
if ((KnownZero2 & NewMask) == NewMask)
return TLO.CombineTo(Op, Op.getOperand(1));
// If the operation can be done in a smaller type, do so.
if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
if (TLO.ShrinkOps && TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
return true;
// If all of the unknown bits are known to be zero on one side or the other
@@ -1581,7 +1581,7 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op,
KnownOne2, TLO, Depth+1))
return true;
// See if the operation should be performed at a smaller bit width.
if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
if (TLO.ShrinkOps && TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
return true;
}
// FALL THROUGH