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further clarify alignment of globals, fix instcombine

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to not increase the alignment of globals with an assigned
alignment and section.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-04-28 00:31:12 +00:00
parent ce99fa9e26
commit 2d4b8ee1d9
2 changed files with 25 additions and 21 deletions
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37
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -59,29 +59,32 @@ static unsigned EnforceKnownAlignment(Value *V,
// Treat this like a bitcast.
return EnforceKnownAlignment(U->getOperand(0), Align, PrefAlign);
}
break;
return Align;
}
case Instruction::Alloca: {
AllocaInst *AI = cast<AllocaInst>(V);
// If there is a requested alignment and if this is an alloca, round up.
if (AI->getAlignment() >= PrefAlign)
return AI->getAlignment();
AI->setAlignment(PrefAlign);
return PrefAlign;
}
}
if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// If there is a large requested alignment and we can, bump up the alignment
// of the global.
if (!GV->isDeclaration()) {
if (GV->getAlignment() >= PrefAlign)
Align = GV->getAlignment();
else {
GV->setAlignment(PrefAlign);
Align = PrefAlign;
}
}
} else if (AllocaInst *AI = dyn_cast<AllocaInst>(V)) {
// If there is a requested alignment and if this is an alloca, round up.
if (AI->getAlignment() >= PrefAlign)
Align = AI->getAlignment();
else {
AI->setAlignment(PrefAlign);
Align = PrefAlign;
}
if (GV->isDeclaration()) return Align;
if (GV->getAlignment() >= PrefAlign)
return GV->getAlignment();
// We can only increase the alignment of the global if it has no alignment
// specified or if it is not assigned a section. If it is assigned a
// section, the global could be densely packed with other objects in the
// section, increasing the alignment could cause padding issues.
if (!GV->hasSection() || GV->getAlignment() == 0)
GV->setAlignment(PrefAlign);
return GV->getAlignment();
}
return Align;