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[BlockPlacement] Add option to align all non-fall-through blocks.

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Summary: This option is being added for testing purposes.

Reviewers: mcrosier

Subscribers: mcrosier, llvm-commits

Differential Revision: http://reviews.llvm.org/D16410

llvm-svn: 258409
This commit is contained in:
Geoff Berry 2016-01-21 17:25:52 +00:00
parent d8f9568a4c
commit 8cf2ae77e2
1 changed files with 16 additions and 0 deletions
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16
lib/CodeGen/MachineBlockPlacement.cpp
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@ -62,6 +62,13 @@ static cl::opt<unsigned> AlignAllBlock("align-all-blocks",
"blocks in the function."),
cl::init(0), cl::Hidden);
static cl::opt<unsigned> AlignAllNonFallThruBlocks(
"align-all-nofallthru-blocks",
cl::desc("Force the alignment of all "
"blocks that have no fall-through predecessors (i.e. don't add "
"nops that are executed)."),
cl::init(0), cl::Hidden);
static cl::opt<unsigned>
AlignAllLoops("align-all-loops",
cl::desc("Force the alignment of all loops in the function."),
@ -1405,6 +1412,15 @@ bool MachineBlockPlacement::runOnMachineFunction(MachineFunction &F) {
// Align all of the blocks in the function to a specific alignment.
for (MachineBasicBlock &MBB : F)
MBB.setAlignment(AlignAllBlock);
else if (AlignAllNonFallThruBlocks) {
// Align all of the blocks that have no fall-through predecessors to a
// specific alignment.
for (auto MBI = std::next(F.begin()), MBE = F.end(); MBI != MBE; ++MBI) {
auto LayoutPred = std::prev(MBI);
if (!LayoutPred->isSuccessor(&*MBI))
MBI->setAlignment(AlignAllNonFallThruBlocks);
}
}
// We always return true as we have no way to track whether the final order
// differs from the original order.