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Undo tweak. It had no obvious benefit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-13 17:42:48 +00:00
parent a13341737d
commit c438f35df9
1 changed files with 4 additions and 19 deletions
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23
lib/CodeGen/RegAllocLinearScan.cpp
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@ -687,25 +687,10 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
// All registers must have inf weight. Just grab one!
if (!minReg) {
if (BestPhysReg)
minReg = BestPhysReg;
else {
// Get the physical register with the fewest conflicts.
unsigned MinConflicts = ~0U;
for (TargetRegisterClass::iterator i = RC->allocation_order_begin(*mf_),
e = RC->allocation_order_end(*mf_); i != e; ++i) {
unsigned reg = *i;
unsigned NumConflicts = li_->getNumConflictsWithPhysReg(*cur, reg);
if (NumConflicts <= MinConflicts) {
MinConflicts = NumConflicts;
minReg = reg;
}
}
}
if (cur->weight == HUGE_VALF || cur->getSize() == 1)
// Spill a physical register around defs and uses.
li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
minReg = BestPhysReg ? BestPhysReg : *RC->allocation_order_begin(*mf_);
if (cur->weight == HUGE_VALF || cur->getSize() == 1)
// Spill a physical register around defs and uses.
li_->spillPhysRegAroundRegDefsUses(*cur, minReg, *vrm_);
}
}