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Align doubles on 8-byte boundaries if possible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21993 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-05-13 23:14:17 +00:00
parent 0db07092a7
commit a8217e3000
1 changed files with 9 additions and 0 deletions

9
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@ -140,6 +140,15 @@ FunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli,
const Type *Ty = AI->getAllocatedType(); const Type *Ty = AI->getAllocatedType();
uint64_t TySize = TLI.getTargetData().getTypeSize(Ty); uint64_t TySize = TLI.getTargetData().getTypeSize(Ty);
unsigned Align = TLI.getTargetData().getTypeAlignment(Ty); unsigned Align = TLI.getTargetData().getTypeAlignment(Ty);
// If the alignment of the value is smaller than the size of the value,
// and if the size of the value is particularly small (<= 8 bytes),
// round up to the size of the value for potentially better performance.
//
// FIXME: This could be made better with a preferred alignment hook in
// TargetData. It serves primarily to 8-byte align doubles for X86.
if (Align < TySize && TySize <= 8) Align = TySize;
TySize *= CUI->getValue(); // Get total allocated size. TySize *= CUI->getValue(); // Get total allocated size.
StaticAllocaMap[AI] = StaticAllocaMap[AI] =
MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align); MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align);