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Cleanups.

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Make things a little more efficient as suggested by Evan.

llvm-svn: 89489
This commit is contained in:
David Greene 2009-11-20 21:13:27 +00:00
parent 35731e4453
commit b4587dcdc9
1 changed files with 6 additions and 3 deletions
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9
lib/CodeGen/RegAllocLinearScan.cpp
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@ -87,6 +87,7 @@ namespace {
// Initialize the queue to record recently-used registers.
if (NumRecentlyUsedRegs > 0)
RecentRegs.resize(NumRecentlyUsedRegs, 0);
RecentNext = RecentRegs.begin();
}
typedef std::pair<LiveInterval*, LiveInterval::iterator> IntervalPtr;
@ -154,14 +155,16 @@ namespace {
std::auto_ptr<Spiller> spiller_;
// The queue of recently-used registers.
SmallVector<unsigned, 3> RecentRegs;
SmallVector<unsigned, 4> RecentRegs;
SmallVector<unsigned, 4>::iterator RecentNext;
// Record that we just picked this register.
void recordRecentlyUsed(unsigned reg) {
assert(reg != 0 && "Recently used register is NOREG!");
if (!RecentRegs.empty()) {
std::copy(RecentRegs.begin() + 1, RecentRegs.end(), RecentRegs.begin());
RecentRegs.back() = reg;
*RecentNext++ = reg;
if (RecentNext == RecentRegs.end())
RecentNext = RecentRegs.begin();
}
}