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teach "convert from scalar" to handle loads of fca's.

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llvm-svn: 63659
This commit is contained in:
Chris Lattner 2009-02-03 21:08:45 +00:00
parent fc79cef792
commit 4d41e7d461
2 changed files with 38 additions and 2 deletions
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31
lib/Transforms/Scalar/ScalarReplAggregates.cpp
View File

@ -1423,6 +1423,31 @@ Value *SROA::ConvertScalar_ExtractValue(Value *FromVal, const Type *ToType,
V = Builder.CreateBitCast(V, ToType, "tmp");
return V;
}
// If ToType is a first class aggregate, extract out each of the pieces and
// use insertvalue's to form the FCA.
if (const StructType *ST = dyn_cast<StructType>(ToType)) {
const StructLayout &Layout = *TD->getStructLayout(ST);
Value *Res = UndefValue::get(ST);
for (unsigned i = 0, e = ST->getNumElements(); i != e; ++i) {
Value *Elt = ConvertScalar_ExtractValue(FromVal, ST->getElementType(i),
Offset+Layout.getElementOffset(i),
Builder);
Res = Builder.CreateInsertValue(Res, Elt, i, "tmp");
}
return Res;
}
if (const ArrayType *AT = dyn_cast<ArrayType>(ToType)) {
uint64_t EltSize = TD->getTypePaddedSizeInBits(AT->getElementType());
Value *Res = UndefValue::get(AT);
for (unsigned i = 0, e = AT->getNumElements(); i != e; ++i) {
Value *Elt = ConvertScalar_ExtractValue(FromVal, AT->getElementType(),
Offset+i*EltSize, Builder);
Res = Builder.CreateInsertValue(Res, Elt, i, "tmp");
}
return Res;
}
// Otherwise, this must be a union that was converted to an integer value.
const IntegerType *NTy = cast<IntegerType>(FromVal->getType());
@ -1444,9 +1469,11 @@ Value *SROA::ConvertScalar_ExtractValue(Value *FromVal, const Type *ToType,
// We do this to support (f.e.) loads off the end of a structure where
// only some bits are used.
if (ShAmt > 0 && (unsigned)ShAmt < NTy->getBitWidth())
FromVal = Builder.CreateLShr(FromVal, ConstantInt::get(FromVal->getType(), ShAmt), "tmp");
FromVal = Builder.CreateLShr(FromVal, ConstantInt::get(FromVal->getType(),
ShAmt), "tmp");
else if (ShAmt < 0 && (unsigned)-ShAmt < NTy->getBitWidth())
FromVal = Builder.CreateShl(FromVal, ConstantInt::get(FromVal->getType(), -ShAmt), "tmp");
FromVal = Builder.CreateShl(FromVal, ConstantInt::get(FromVal->getType(),
-ShAmt), "tmp");
// Finally, unconditionally truncate the integer to the right width.
unsigned LIBitWidth = TD->getTypeSizeInBits(ToType);

9
test/Transforms/ScalarRepl/sroa-fca.ll
View File

@ -10,3 +10,12 @@ define i64 @test({i32, i32} %A) {
ret i64 %Q
}
define {i32,i32} @test2(i64 %A) {
%X = alloca i64
%Y = bitcast i64* %X to {i32,i32}*
store i64 %A, i64* %X
%Q = load {i32,i32}* %Y
ret {i32,i32} %Q
}