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improve comments. 

llvm-svn: 112214
This commit is contained in:
Chris Lattner 2010-08-26 20:08:43 +00:00
parent 384fa91deb
commit d7e54804ee
1 changed files with 2 additions and 5 deletions
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7
clang/lib/CodeGen/TargetInfo.cpp
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@ -590,17 +590,14 @@ ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty) const {
} }
if (const VectorType *VT = Ty->getAs<VectorType>()) { if (const VectorType *VT = Ty->getAs<VectorType>()) {
// On Darwin, some vectors are returned in registers. // On Darwin, some vectors are passed in memory, we handle this by passing
// it as an i8/i16/i32/i64.
if (IsDarwinVectorABI) { if (IsDarwinVectorABI) {
uint64_t Size = getContext().getTypeSize(Ty); uint64_t Size = getContext().getTypeSize(Ty);
// Always return in register if it fits in a general purpose
// register, or if it is 64 bits and has a single element.
if ((Size == 8 || Size == 16 || Size == 32) || if ((Size == 8 || Size == 16 || Size == 32) ||
(Size == 64 && VT->getNumElements() == 1)) (Size == 64 && VT->getNumElements() == 1))
return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
Size)); Size));
return ABIArgInfo::getIndirect(0); return ABIArgInfo::getIndirect(0);
} }