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[X86] Remove useless target specific combine on TRUNCATE dag nodes. 

Before revision 171146, function 'PerformTruncateCombine' used to perform
a premature lowering of TRUNCATE dag nodes.
Revision 171146 then moved all the logic implemented by PerformTruncateCombine
to a custom lowering hook. However, that revision forgot to delete
function PerformTruncateCombine from the code.

This patch removes function 'PerformTruncateCombine' since it has no effect
on the SelectionDAG. No functional change intended.

llvm-svn: 237122
This commit is contained in:
Andrea Di Biagio 2015-05-12 12:34:22 +00:00
parent b48c905613
commit 454f7909c6
1 changed files with 0 additions and 11 deletions
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11
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -1586,7 +1586,6 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
setTargetDAGCombine(ISD::ANY_EXTEND);
setTargetDAGCombine(ISD::SIGN_EXTEND);
setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
setTargetDAGCombine(ISD::TRUNCATE);
setTargetDAGCombine(ISD::SINT_TO_FP);
setTargetDAGCombine(ISD::SETCC);
setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
@ -20734,15 +20733,6 @@ static SDValue PerformShuffleCombine(SDNode *N, SelectionDAG &DAG,
return SDValue();
}
/// PerformTruncateCombine - Converts truncate operation to
/// a sequence of vector shuffle operations.
/// It is possible when we truncate 256-bit vector to 128-bit vector
static SDValue PerformTruncateCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const X86Subtarget *Subtarget) {
return SDValue();
}
/// XFormVExtractWithShuffleIntoLoad - Check if a vector extract from a target
/// specific shuffle of a load can be folded into a single element load.
/// Similar handling for VECTOR_SHUFFLE is performed by DAGCombiner, but
@ -24305,7 +24295,6 @@ SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
case ISD::SIGN_EXTEND: return PerformSExtCombine(N, DAG, DCI, Subtarget);
case ISD::SIGN_EXTEND_INREG:
return PerformSIGN_EXTEND_INREGCombine(N, DAG, Subtarget);
case ISD::TRUNCATE: return PerformTruncateCombine(N, DAG,DCI,Subtarget);
case ISD::SETCC: return PerformISDSETCCCombine(N, DAG, Subtarget);
case X86ISD::SETCC: return PerformSETCCCombine(N, DAG, DCI, Subtarget);
case X86ISD::BRCOND: return PerformBrCondCombine(N, DAG, DCI, Subtarget);