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Fix a bug in the legalization of shuffle vectors. When we emulate shuffles using BUILD_VECTORS we may be using a BV of different type. Make sure to cast it back.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2012-01-10 14:28:46 +00:00
parent 66a7fd78ee
commit 6c0366cb25
2 changed files with 16 additions and 1 deletions
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4
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -2862,8 +2862,10 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node) {
Op1,
DAG.getIntPtrConstant(Idx - NumElems)));
}
Tmp1 = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], Ops.size());
// We may have changed the BUILD_VECTOR type. Cast it back to the Node type.
Tmp1 = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0), Tmp1);
Results.push_back(Tmp1);
break;
}

13
test/CodeGen/X86/2012-1-10-buildvector.ll Normal file
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@ -0,0 +1,13 @@
; RUN: llc < %s -march=x86 -mcpu=corei7-avx -mattr=+avx -mtriple=i686-pc-win32
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f80:128:128-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S32"
target triple = "i686-pc-win32"
define void @bad_cast() {
entry:
%vext.i = shufflevector <2 x i64> undef, <2 x i64> undef, <3 x i32> <i32 0, i32 1, i32 undef>
%vecinit8.i = shufflevector <3 x i64> zeroinitializer, <3 x i64> %vext.i, <3 x i32> <i32 0, i32 3, i32 4>
store <3 x i64> %vecinit8.i, <3 x i64>* undef, align 32
unreachable
}