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When generating a vector the really slow way, via loads 

and stores, handle the case where the element size is not
a valid target type correctly (PPC).

llvm-svn: 89521
This commit is contained in:
Dale Johannesen 2009-11-21 00:53:23 +00:00
parent 847f2a10ee
commit b91eba382d
2 changed files with 46 additions and 3 deletions
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12
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
View File

@ -1517,6 +1517,7 @@ SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
// Create the stack frame object.
EVT VT = Node->getValueType(0);
EVT OpVT = Node->getOperand(0).getValueType();
EVT EltVT = VT.getVectorElementType();
DebugLoc dl = Node->getDebugLoc();
SDValue FIPtr = DAG.CreateStackTemporary(VT);
int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
@ -1524,7 +1525,7 @@ SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
// Emit a store of each element to the stack slot.
SmallVector<SDValue, 8> Stores;
unsigned TypeByteSize = OpVT.getSizeInBits() / 8;
unsigned TypeByteSize = EltVT.getSizeInBits() / 8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
// Ignore undef elements.
@ -1535,8 +1536,13 @@ SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl, Node->getOperand(i),
Idx, SV, Offset));
// If EltVT smaller than OpVT, only store the bits necessary.
if (EltVT.bitsLT(OpVT))
Stores.push_back(DAG.getTruncStore(DAG.getEntryNode(), dl,
Node->getOperand(i), Idx, SV, Offset, EltVT));
else
Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl,
Node->getOperand(i), Idx, SV, Offset));
}
SDValue StoreChain;

37
llvm/test/CodeGen/PowerPC/vec_buildvector_loadstore.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: llc < %s -march=ppc32 -mtriple=powerpc-apple-darwin -mattr=+altivec | FileCheck %s
; Formerly this did byte loads and word stores.
@a = external global <16 x i8>
@b = external global <16 x i8>
@c = external global <16 x i8>
define void @foo() nounwind ssp {
; CHECK: _foo:
; CHECK-NOT: stw
entry:
%tmp0 = load <16 x i8>* @a, align 16
%tmp180.i = extractelement <16 x i8> %tmp0, i32 0 ; <i8> [#uses=1]
%tmp181.i = insertelement <16 x i8> <i8 0, i8 0, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef, i8 undef>, i8 %tmp180.i, i32 2 ; <<16 x i8>> [#uses=1]
%tmp182.i = extractelement <16 x i8> %tmp0, i32 1 ; <i8> [#uses=1]
%tmp183.i = insertelement <16 x i8> %tmp181.i, i8 %tmp182.i, i32 3 ; <<16 x i8>> [#uses=1]
%tmp184.i = insertelement <16 x i8> %tmp183.i, i8 0, i32 4 ; <<16 x i8>> [#uses=1]
%tmp185.i = insertelement <16 x i8> %tmp184.i, i8 0, i32 5 ; <<16 x i8>> [#uses=1]
%tmp186.i = extractelement <16 x i8> %tmp0, i32 4 ; <i8> [#uses=1]
%tmp187.i = insertelement <16 x i8> %tmp185.i, i8 %tmp186.i, i32 6 ; <<16 x i8>> [#uses=1]
%tmp188.i = extractelement <16 x i8> %tmp0, i32 5 ; <i8> [#uses=1]
%tmp189.i = insertelement <16 x i8> %tmp187.i, i8 %tmp188.i, i32 7 ; <<16 x i8>> [#uses=1]
%tmp190.i = insertelement <16 x i8> %tmp189.i, i8 0, i32 8 ; <<16 x i8>> [#uses=1]
%tmp191.i = insertelement <16 x i8> %tmp190.i, i8 0, i32 9 ; <<16 x i8>> [#uses=1]
%tmp192.i = extractelement <16 x i8> %tmp0, i32 8 ; <i8> [#uses=1]
%tmp193.i = insertelement <16 x i8> %tmp191.i, i8 %tmp192.i, i32 10 ; <<16 x i8>> [#uses=1]
%tmp194.i = extractelement <16 x i8> %tmp0, i32 9 ; <i8> [#uses=1]
%tmp195.i = insertelement <16 x i8> %tmp193.i, i8 %tmp194.i, i32 11 ; <<16 x i8>> [#uses=1]
%tmp196.i = insertelement <16 x i8> %tmp195.i, i8 0, i32 12 ; <<16 x i8>> [#uses=1]
%tmp197.i = insertelement <16 x i8> %tmp196.i, i8 0, i32 13 ; <<16 x i8>> [#uses=1]
%tmp201 = shufflevector <16 x i8> %tmp197.i, <16 x i8> %tmp0, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 28, i32 29>; ModuleID = 'try.c'
store <16 x i8> %tmp201, <16 x i8>* @c, align 16
br label %return
return: ; preds = %bb2
ret void
; CHECK: blr
}