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Fix a bug in the scalarization of BUILD_VECTOR. BUILD_VECTOR elements may be wider than the output element type. Make sure to trunc them if needed.

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Together with Michael Kuperstein <michael.m.kuperstein@intel.com>

llvm-svn: 160235
This commit is contained in:
Nadav Rotem 2012-07-15 20:39:08 +00:00
parent a09775b875
commit 338506d265
3 changed files with 18 additions and 1 deletions
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1
lib/CodeGen/SelectionDAG/LegalizeTypes.h
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@ -516,6 +516,7 @@ private:
SDValue ScalarizeVecRes_InregOp(SDNode *N);
SDValue ScalarizeVecRes_BITCAST(SDNode *N);
SDValue ScalarizeVecRes_BUILD_VECTOR(SDNode *N);
SDValue ScalarizeVecRes_CONVERT_RNDSAT(SDNode *N);
SDValue ScalarizeVecRes_EXTRACT_SUBVECTOR(SDNode *N);
SDValue ScalarizeVecRes_FP_ROUND(SDNode *N);

10
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
View File

@ -48,7 +48,7 @@ void DAGTypeLegalizer::ScalarizeVectorResult(SDNode *N, unsigned ResNo) {
case ISD::MERGE_VALUES: R = ScalarizeVecRes_MERGE_VALUES(N, ResNo);break;
case ISD::BITCAST: R = ScalarizeVecRes_BITCAST(N); break;
case ISD::BUILD_VECTOR: R = N->getOperand(0); break;
case ISD::BUILD_VECTOR: R = ScalarizeVecRes_BUILD_VECTOR(N); break;
case ISD::CONVERT_RNDSAT: R = ScalarizeVecRes_CONVERT_RNDSAT(N); break;
case ISD::EXTRACT_SUBVECTOR: R = ScalarizeVecRes_EXTRACT_SUBVECTOR(N); break;
case ISD::FP_ROUND: R = ScalarizeVecRes_FP_ROUND(N); break;
@ -152,6 +152,14 @@ SDValue DAGTypeLegalizer::ScalarizeVecRes_BITCAST(SDNode *N) {
NewVT, N->getOperand(0));
}
SDValue DAGTypeLegalizer::ScalarizeVecRes_BUILD_VECTOR(SDNode *N) {
EVT EltVT = N->getValueType(0).getVectorElementType();
SDValue InOp = N->getOperand(0);
if (InOp.getValueType() != EltVT)
return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), EltVT, InOp);
return InOp;
}
SDValue DAGTypeLegalizer::ScalarizeVecRes_CONVERT_RNDSAT(SDNode *N) {
EVT NewVT = N->getValueType(0).getVectorElementType();
SDValue Op0 = GetScalarizedVector(N->getOperand(0));

8
test/CodeGen/Generic/2012-07-15-BuildVectorPromote.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llc -mcpu=corei7 < %s
; We don't care about the output, just that it doesn't crash
define <1 x i1> @buildvec_promote() {
%cmp = icmp ule <1 x i32> undef, undef
%sel = select i1 undef, <1 x i1> undef, <1 x i1> %cmp
ret <1 x i1> %sel
}