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fit in 80 cols and use MBB::isSuccessor instead of a hand

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rolled std::find.

llvm-svn: 123164
This commit is contained in:
Chris Lattner 2011-01-10 07:51:31 +00:00
parent 772e26df36
commit 0e49a35bd2
1 changed files with 4 additions and 5 deletions
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9
lib/CodeGen/MachineCSE.cpp
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@ -284,14 +284,13 @@ bool MachineCSE::isProfitableToCSE(unsigned CSReg, unsigned Reg,
MachineInstr *CSMI, MachineInstr *MI) {
// FIXME: Heuristics that works around the lack the live range splitting.
// Heuristics #1: Don't cse "cheap" computating if the def is not local or in an
// immediate predecessor. We don't want to increase register pressure and end up
// causing other computation to be spilled.
// Heuristics #1: Don't CSE "cheap" computation if the def is not local or in
// an immediate predecessor. We don't want to increase register pressure and
// end up causing other computation to be spilled.
if (MI->getDesc().isAsCheapAsAMove()) {
MachineBasicBlock *CSBB = CSMI->getParent();
MachineBasicBlock *BB = MI->getParent();
if (CSBB != BB &&
find(CSBB->succ_begin(), CSBB->succ_end(), BB) == CSBB->succ_end())
if (CSBB != BB && !CSBB->isSuccessor(BB))
return false;
}