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Add a dagcombine optimization to convert concat_vectors of undefs into a single undef.

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The unoptimized concat_vectors isd prevented the canonicalization of the vector_shuffle node.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-07-14 21:30:27 +00:00
parent 27982e1108
commit b7e230d999
2 changed files with 28 additions and 0 deletions
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11
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -7816,6 +7816,17 @@ SDValue DAGCombiner::visitCONCAT_VECTORS(SDNode *N) {
if (N->getNumOperands() == 1)
return N->getOperand(0);
// Check if all of the operands are undefs.
bool AllUndef = true;
for (unsigned i = 0; i < N->getNumOperands(); ++i)
if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
AllUndef = false;
break;
}
if (AllUndef)
return DAG.getUNDEF(N->getValueType(0));
return SDValue();
}

17
test/CodeGen/X86/2012-07-10-shufnorm.ll Normal file
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@ -0,0 +1,17 @@
; RUN: llc < %s -march=x86 -mcpu=corei7 -mattr=+avx | FileCheck %s
; CHECK: ocl
define void @ocl() {
entry:
%vext = shufflevector <2 x double> zeroinitializer, <2 x double> undef, <8 x i32> <i32 0, i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
%vecinit = shufflevector <8 x double> %vext, <8 x double> undef, <8 x i32> <i32 0, i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
%vecinit1 = insertelement <8 x double> %vecinit, double undef, i32 2
%vecinit3 = insertelement <8 x double> %vecinit1, double undef, i32 3
%vecinit5 = insertelement <8 x double> %vecinit3, double 0.000000e+00, i32 4
%vecinit9 = shufflevector <8 x double> %vecinit5, <8 x double> undef, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 8, i32 9, i32 10>
store <8 x double> %vecinit9, <8 x double>* undef
ret void
; CHECK: vxorps
; CHECK: ret
}