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Align doubles on 8-byte boundaries if possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21993 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -140,6 +140,15 @@ FunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli,
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const Type *Ty = AI->getAllocatedType();
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uint64_t TySize = TLI.getTargetData().getTypeSize(Ty);
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unsigned Align = TLI.getTargetData().getTypeAlignment(Ty);
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// If the alignment of the value is smaller than the size of the value,
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// and if the size of the value is particularly small (<= 8 bytes),
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// round up to the size of the value for potentially better performance.
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//
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// FIXME: This could be made better with a preferred alignment hook in
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// TargetData. It serves primarily to 8-byte align doubles for X86.
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if (Align < TySize && TySize <= 8) Align = TySize;
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TySize *= CUI->getValue(); // Get total allocated size.
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StaticAllocaMap[AI] =
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MF.getFrameInfo()->CreateStackObject((unsigned)TySize, Align);
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