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Move the constant-folding support for FP_ROUND in SelectionDAG from the one-operand version of getNode() to the two-operand version, since it became a two-operand node at sound point.

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Zap a testcase that this allows us to completely fold away.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154447 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2012-04-10 22:46:53 +00:00
parent 83f17f25fc
commit 06886aaaeb
2 changed files with 12 additions and 19 deletions
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11
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -2428,7 +2428,6 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
case ISD::FABS:
V.clearSign();
return getConstantFP(V, VT);
case ISD::FP_ROUND:
case ISD::FP_EXTEND: {
bool ignored;
// This can return overflow, underflow, or inexact; we don't care.
@@ -2994,6 +2993,16 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
default: break;
}
}
if (Opcode == ISD::FP_ROUND) {
APFloat V = N1CFP->getValueAPF(); // make copy
bool ignored;
// This can return overflow, underflow, or inexact; we don't care.
// FIXME need to be more flexible about rounding mode.
(void)V.convert(*EVTToAPFloatSemantics(VT),
APFloat::rmNearestTiesToEven, &ignored);
return getConstantFP(V, VT);
}
}
// Canonicalize an UNDEF to the RHS, even over a constant.