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Fix PR13859

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- Preserve the original NOutVT during casting from vector to integer by
  extracting vector elements.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164042 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Liao 2012-09-17 18:05:20 +00:00
parent 9bb938c540
commit bb73002247
2 changed files with 35 additions and 6 deletions
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13
lib/CodeGen/SelectionDAG/LegalizeTypesGeneric.cpp
View File

@ -95,17 +95,18 @@ void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) {
// Handle cases like i64 = BITCAST v1i64 on x86, where the operand
// is legal but the result is not.
unsigned NumElems = 2;
EVT NVT = EVT::getVectorVT(*DAG.getContext(), NOutVT, NumElems);
EVT ElemVT = NOutVT;
EVT NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
// If <NOutVT * N> is not a legal type, try <NOutVT/2 * (N*2)>.
// If <ElemVT * N> is not a legal type, try <ElemVT/2 * (N*2)>.
while (!isTypeLegal(NVT)) {
unsigned NewSizeInBits = NOutVT.getSizeInBits() / 2;
unsigned NewSizeInBits = ElemVT.getSizeInBits() / 2;
// If the element size is smaller than byte, bail.
if (NewSizeInBits < 8)
break;
NumElems *= 2;
NOutVT = EVT::getIntegerVT(*DAG.getContext(), NewSizeInBits);
NVT = EVT::getVectorVT(*DAG.getContext(), NOutVT, NumElems);
ElemVT = EVT::getIntegerVT(*DAG.getContext(), NewSizeInBits);
NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
}
if (isTypeLegal(NVT)) {
@ -113,7 +114,7 @@ void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) {
SmallVector<SDValue, 8> Vals;
for (unsigned i = 0; i < NumElems; ++i)
Vals.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT,
Vals.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ElemVT,
CastInOp, DAG.getIntPtrConstant(i)));
// Build Lo, Hi pair by pairing extracted elements if needed.

28
test/CodeGen/X86/pr13859.ll Normal file
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@ -0,0 +1,28 @@
; RUN: llc < %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.7.0"
define void @_Z17FilterYUVRows_MMXi(i32 %af) nounwind ssp {
entry:
%aMyAlloca = alloca i32, align 32
%dest = alloca <1 x i64>, align 32
%a32 = load i32* %aMyAlloca, align 4
%aconv = trunc i32 %a32 to i16
%a36 = insertelement <4 x i16> undef, i16 %aconv, i32 0
%a37 = insertelement <4 x i16> %a36, i16 %aconv, i32 1
%a38 = insertelement <4 x i16> %a37, i16 %aconv, i32 2
%a39 = insertelement <4 x i16> %a38, i16 %aconv, i32 3
%a40 = bitcast <4 x i16> %a39 to x86_mmx
%a41 = bitcast x86_mmx %a40 to <1 x i64>
%a47 = trunc i32 %a32 to i1
br i1 %a47, label %a48, label %a49
a48:
unreachable
a49:
store <1 x i64> %a41, <1 x i64>* %dest, align 8 ; !!!
ret void
}