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[ARM] Align global variables passed to memory intrinsics

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Fill in the TODO in CodeGenPrepare::OptimizeCallInst so that global
variables that are passed to memory intrinsics are aligned in the same
way that allocas are.

Differential Revision: http://reviews.llvm.org/D8421


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Brawn
2015-04-13 10:47:39 +00:00
parent 2b6ba77325
commit afa4193fc8
3 changed files with 66 additions and 16 deletions
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18
lib/CodeGen/CodeGenPrepare.cpp
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@@ -1288,13 +1288,25 @@ bool CodeGenPrepare::OptimizeCallInst(CallInst *CI, bool& ModifiedDT) {
cast<PointerType>(Arg->getType())->getAddressSpace()), 0);
Value *Val = Arg->stripAndAccumulateInBoundsConstantOffsets(*TD, Offset);
uint64_t Offset2 = Offset.getLimitedValue();
if ((Offset2 & (PrefAlign-1)) != 0)
continue;
AllocaInst *AI;
if ((Offset2 & (PrefAlign-1)) == 0 &&
(AI = dyn_cast<AllocaInst>(Val)) &&
if ((AI = dyn_cast<AllocaInst>(Val)) &&
AI->getAlignment() < PrefAlign &&
TD->getTypeAllocSize(AI->getAllocatedType()) >= MinSize + Offset2)
AI->setAlignment(PrefAlign);
// TODO: Also align GlobalVariables
// Global variables can only be aligned if they are defined in this
// object (i.e. they are uniquely initialized in this object), and
// over-aligning global variables that have an explicit section is
// forbidden.
GlobalVariable *GV;
if ((GV = dyn_cast<GlobalVariable>(Val)) &&
GV->hasUniqueInitializer() &&
!GV->hasSection() &&
GV->getAlignment() < PrefAlign &&
TD->getTypeAllocSize(
GV->getType()->getElementType()) >= MinSize + Offset2)
GV->setAlignment(PrefAlign);
}
// If this is a memcpy (or similar) then we may be able to improve the
// alignment