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Remove unnecessary bit-wise AND from the limited precision work.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-09-10 06:26:10 +00:00
parent c0c3b9a3d0
commit fc2508eb78
1 changed files with 4 additions and 6 deletions
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10
lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
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@ -2755,18 +2755,16 @@ GetSignificand(SelectionDAG &DAG, SDValue Op) {
// GetExponent - Get the exponent:
//
// (float)(((Op1 & 0x7f800000) >> 23) - 127);
// (float)((Op1 >> 23) - 127);
//
// where Op is the hexidecimal representation of floating point value.
static SDValue
GetExponent(SelectionDAG &DAG, SDValue Op) {
SDValue t1 = DAG.getNode(ISD::AND, MVT::i32, Op,
DAG.getConstant(0x7f800000, MVT::i32));
SDValue t2 = DAG.getNode(ISD::SRL, MVT::i32, t1,
SDValue t1 = DAG.getNode(ISD::SRL, MVT::i32, Op,
DAG.getConstant(23, MVT::i32));
SDValue t3 = DAG.getNode(ISD::SUB, MVT::i32, t2,
SDValue t2 = DAG.getNode(ISD::SUB, MVT::i32, t1,
DAG.getConstant(127, MVT::i32));
return DAG.getNode(ISD::UINT_TO_FP, MVT::f32, t3);
return DAG.getNode(ISD::UINT_TO_FP, MVT::f32, t2);
}
/// Inlined utility function to implement binary input atomic intrinsics for