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Fix PR1845 and rdar://5676945. Generic vectors smaller

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than hardware supported type will be scalarized, so we
can infer their alignment from that info.

We now codegen pr1845 into:

_boolVectorSelect:
	lbz r2, 0(r3)
	stb r2, -16(r1)
	blr 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45796 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-10 00:30:57 +00:00
parent 314286f6bd
commit 9c4428b217
2 changed files with 23 additions and 19 deletions
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2
include/llvm/Target/TargetData.h
View File

@ -92,7 +92,7 @@ private:
void setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
unsigned char pref_align, uint32_t bit_width);
unsigned getAlignmentInfo(AlignTypeEnum align_type, uint32_t bit_width,
bool ABIAlign) const;
bool ABIAlign, const Type *Ty) const;
//! Internal helper method that returns requested alignment for type.
unsigned char getAlignment(const Type *Ty, bool abi_or_pref) const;

40
lib/Target/TargetData.cpp
View File

@ -154,7 +154,8 @@ const TargetAlignElem TargetData::InvalidAlignmentElem =
<i>p:@verbatim<size>:<abi_align>:<pref_align>@endverbatim</i>: Pointer size,
ABI and preferred alignment.
<br><br>
<i>@verbatim<type><size>:<abi_align>:<pref_align>@endverbatim</i>: Numeric type alignment. Type is
<i>@verbatim<type><size>:<abi_align>:<pref_align>@endverbatim</i>: Numeric type
alignment. Type is
one of <i>i|f|v|a</i>, corresponding to integer, floating point, vector (aka
packed) or aggregate. Size indicates the size, e.g., 32 or 64 bits.
\p
@ -258,7 +259,8 @@ TargetData::setAlignment(AlignTypeEnum align_type, unsigned char abi_align,
/// getAlignmentInfo - Return the alignment (either ABI if ABIInfo = true or
/// preferred if ABIInfo = false) the target wants for the specified datatype.
unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType,
uint32_t BitWidth, bool ABIInfo) const {
uint32_t BitWidth, bool ABIInfo,
const Type *Ty) const {
// Check to see if we have an exact match and remember the best match we see.
int BestMatchIdx = -1;
int LargestInt = -1;
@ -293,14 +295,22 @@ unsigned TargetData::getAlignmentInfo(AlignTypeEnum AlignType,
}
}
// For integers, if we didn't find a best match, use the largest one found.
if (BestMatchIdx == -1)
BestMatchIdx = LargestInt;
// Okay, we didn't find an exact solution. Fall back here depending on what
// is being looked for.
assert(BestMatchIdx != -1 && "Didn't find alignment info for this datatype!");
if (BestMatchIdx == -1) {
// If we didn't find an integer alignment, fall back on most conservative.
if (AlignType == INTEGER_ALIGN) {
BestMatchIdx = LargestInt;
} else {
assert(AlignType == VECTOR_ALIGN && "Unknown alignment type!");
// If we didn't find a vector size that is smaller or equal to this type,
// then we will end up scalarizing this to its element type. Just return
// the alignment of the element.
return getAlignment(cast<VectorType>(Ty)->getElementType(), ABIInfo);
}
}
// Since we got a "best match" index, just return it.
return ABIInfo ? Alignments[BestMatchIdx].ABIAlign
: Alignments[BestMatchIdx].PrefAlign;
@ -474,7 +484,7 @@ unsigned char TargetData::getAlignment(const Type *Ty, bool abi_or_pref) const {
// Get the layout annotation... which is lazily created on demand.
const StructLayout *Layout = getStructLayout(cast<StructType>(Ty));
unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref);
unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref, Ty);
return std::max(Align, (unsigned)Layout->getAlignment());
}
case Type::IntegerTyID:
@ -490,22 +500,16 @@ unsigned char TargetData::getAlignment(const Type *Ty, bool abi_or_pref) const {
case Type::X86_FP80TyID:
AlignType = FLOAT_ALIGN;
break;
case Type::VectorTyID: {
const VectorType *VTy = cast<VectorType>(Ty);
// Degenerate vectors are assumed to be scalar-ized
if (VTy->getNumElements() == 1)
return getAlignment(VTy->getElementType(), abi_or_pref);
else
AlignType = VECTOR_ALIGN;
case Type::VectorTyID:
AlignType = VECTOR_ALIGN;
break;
}
default:
assert(0 && "Bad type for getAlignment!!!");
break;
}
return getAlignmentInfo((AlignTypeEnum)AlignType, getTypeSizeInBits(Ty),
abi_or_pref);
abi_or_pref, Ty);
}
unsigned char TargetData::getABITypeAlignment(const Type *Ty) const {