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Fix a crash in the legalization of large vectors.

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When truncating a result of a vector that is split we need
to use the result of the split vector, and not re-split the dead node.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160357 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-07-17 09:07:37 +00:00
parent f5c0539092
commit 5589a69f0a
2 changed files with 19 additions and 6 deletions
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9
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
View File

@ -592,14 +592,11 @@ SDValue DAGTypeLegalizer::PromoteIntRes_TRUNCATE(SDNode *N) {
assert(isPowerOf2_32(NumElts) &&
"Promoted vector type must be a power of two");
EVT HalfVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts/2);
SDValue EOp1, EOp2;
GetSplitVector(InOp, EOp1, EOp2);
EVT HalfNVT = EVT::getVectorVT(*DAG.getContext(), NVT.getScalarType(),
NumElts/2);
SDValue EOp1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, HalfVT, InOp,
DAG.getIntPtrConstant(0));
SDValue EOp2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, HalfVT, InOp,
DAG.getIntPtrConstant(NumElts/2));
EOp1 = DAG.getNode(ISD::TRUNCATE, dl, HalfNVT, EOp1);
EOp2 = DAG.getNode(ISD::TRUNCATE, dl, HalfNVT, EOp2);

16
test/CodeGen/X86/2012-07-17-vtrunc.ll Normal file
View File

@ -0,0 +1,16 @@
; RUN: llc < %s -march=x86-64 -mcpu=corei7
define void @autogen_SD33189483() {
BB:
br label %CF76
CF76: ; preds = %CF76, %BB
%Shuff13 = shufflevector <4 x i64> zeroinitializer, <4 x i64> undef, <4 x i32> zeroinitializer
%Tr16 = trunc <8 x i64> <i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1, i64 -1> to <8 x i1>
%E19 = extractelement <8 x i1> %Tr16, i32 2
br i1 %E19, label %CF76, label %CF78
CF78: ; preds = %CF78, %CF76
%BC = bitcast <4 x i64> %Shuff13 to <4 x double>
br label %CF78
}