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WidenVecRes_BUILD_VECTOR must use the first operand's type

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Because integer BUILD_VECTOR operands may have a larger type than the result's
vector element type, and all operands must have the same type, when widening a
BUILD_VECTOR node by adding UNDEFs, we cannot use the vector element type, but
rather must use the type of the existing operands.

Another bug found by llvm-stress.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-07-09 18:55:10 +00:00
parent 7c2d8f7b5e
commit b9c8c40acb
2 changed files with 27 additions and 1 deletions
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5
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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@ -1872,7 +1872,10 @@ SDValue DAGTypeLegalizer::WidenVecRes_BUILD_VECTOR(SDNode *N) {
SDLoc dl(N);
// Build a vector with undefined for the new nodes.
EVT VT = N->getValueType(0);
EVT EltVT = VT.getVectorElementType();
// Integer BUILD_VECTOR operands may be larger than the node's vector element
// type. The UNDEFs need to have the same type as the existing operands.
EVT EltVT = N->getOperand(0).getValueType();
unsigned NumElts = VT.getVectorNumElements();
EVT WidenVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);

23
test/CodeGen/PowerPC/bv-widen-undef.ll Normal file
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@ -0,0 +1,23 @@
; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 < %s
target triple = "powerpc64-unknown-linux-gnu"
define void @autogen_SD4357(i8) {
BB:
br label %CF
CF: ; preds = %CF, %BB
br i1 undef, label %CF, label %CF77
CF77: ; preds = %CF81, %CF77, %CF
%Shuff12 = shufflevector <2 x i8> <i8 -1, i8 -1>, <2 x i8> <i8 -1, i8 -1>, <2 x i32> <i32 0, i32 undef>
br i1 undef, label %CF77, label %CF80
CF80: ; preds = %CF80, %CF77
%B21 = mul <2 x i8> %Shuff12, <i8 -1, i8 -1>
%Cmp24 = fcmp une ppc_fp128 0xM00000000000000000000000000000000, 0xM00000000000000000000000000000000
br i1 %Cmp24, label %CF80, label %CF81
CF81: ; preds = %CF80
%I36 = insertelement <2 x i8> %B21, i8 %0, i32 0
br label %CF77
}