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teach SROA to handle promoting vector allocas with a memset into them into

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a vector type instead of into an integer type.

llvm-svn: 66368
This commit is contained in:
Chris Lattner 2009-03-08 04:17:04 +00:00
parent 950cbfb6c0
commit f05ebf0849
2 changed files with 35 additions and 19 deletions
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32
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -1350,8 +1350,6 @@ bool SROA::CanConvertToScalar(Value *V, bool &IsNotTrivial, const Type *&VecTy,
// Store of constant value and constant size.
if (isa<ConstantInt>(MSI->getValue()) &&
isa<ConstantInt>(MSI->getLength())) {
// FIXME (!): Why reset VecTy?
VecTy = Type::VoidTy;
IsNotTrivial = true;
continue;
}
@ -1628,21 +1626,25 @@ Value *SROA::ConvertScalar_InsertValue(Value *SV, Value *Old,
const Type *AllocaType = Old->getType();
if (const VectorType *VTy = dyn_cast<VectorType>(AllocaType)) {
// If the result alloca is a vector type, this is either an element
// access or a bitcast to another vector type.
if (isa<VectorType>(SV->getType())) {
SV = Builder.CreateBitCast(SV, AllocaType, "tmp");
} else {
// Must be an element insertion.
unsigned Elt = Offset/TD->getTypePaddedSizeInBits(VTy->getElementType());
uint64_t VecSize = TD->getTypePaddedSizeInBits(VTy);
uint64_t ValSize = TD->getTypePaddedSizeInBits(SV->getType());
if (SV->getType() != VTy->getElementType())
SV = Builder.CreateBitCast(SV, VTy->getElementType(), "tmp");
// Changing the whole vector with memset or with an access of a different
// vector type?
if (ValSize == VecSize)
return Builder.CreateBitCast(SV, AllocaType, "tmp");
SV = Builder.CreateInsertElement(Old, SV,
ConstantInt::get(Type::Int32Ty, Elt),
"tmp");
}
uint64_t EltSize = TD->getTypePaddedSizeInBits(VTy->getElementType());
// Must be an element insertion.
unsigned Elt = Offset/EltSize;
if (SV->getType() != VTy->getElementType())
SV = Builder.CreateBitCast(SV, VTy->getElementType(), "tmp");
SV = Builder.CreateInsertElement(Old, SV,
ConstantInt::get(Type::Int32Ty, Elt),
"tmp");
return SV;
}

18
test/Transforms/ScalarRepl/vector_memcpy.ll
View File

@ -1,4 +1,7 @@
; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis | grep {ret <16 x float> %A}
; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis > %t
; RUN: grep {ret <16 x float> %A} %t
; RUN: grep {ret <16 x float> zeroinitializer} %t
define <16 x float> @foo(<16 x float> %A) nounwind {
%tmp = alloca <16 x float>, align 16
%tmp2 = alloca <16 x float>, align 16
@ -11,5 +14,16 @@ define <16 x float> @foo(<16 x float> %A) nounwind {
ret <16 x float> %R
}
declare void @llvm.memcpy.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
define <16 x float> @foo2(<16 x float> %A) nounwind {
%tmp2 = alloca <16 x float>, align 16
%s2 = bitcast <16 x float>* %tmp2 to i8*
call void @llvm.memset.i64(i8* %s2, i8 0, i64 64, i32 16)
%R = load <16 x float>* %tmp2
ret <16 x float> %R
}
declare void @llvm.memcpy.i64(i8* nocapture, i8* nocapture, i64, i32) nounwind
declare void @llvm.memset.i64(i8* nocapture, i8, i64, i32) nounwind