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cleanup per feedback. use a helper function for getting the first non-reserved

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physical register in a register class. Make sure to assert if the register
class is empty.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112743 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-09-01 21:34:41 +00:00
parent 269354e570
commit 5a4cbea312
1 changed files with 14 additions and 17 deletions
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31
lib/CodeGen/RegAllocLinearScan.cpp
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@ -336,6 +336,17 @@ namespace {
SmallVector<unsigned, 256> &inactiveCounts,
bool SkipDGRegs);
/// getFirstNonReservedPhysReg - return the first non-reserved physical
/// register in the register class.
unsigned getFirstNonReservedPhysReg(const TargetRegisterClass *RC) {
TargetRegisterClass::iterator aoe = RC->allocation_order_end(*mf_);
TargetRegisterClass::iterator i = RC->allocation_order_begin(*mf_);
while (i != aoe && reservedRegs_.test(*i))
++i;
assert(i != aoe && "All registers reserved?!");
return *i;
}
void ComputeRelatedRegClasses();
template <typename ItTy>
@ -951,14 +962,8 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
const TargetRegisterClass *RC = mri_->getRegClass(cur->reg);
if (cur->empty()) {
unsigned physReg = vrm_->getRegAllocPref(cur->reg);
if (!physReg) {
TargetRegisterClass::iterator aoe = RC->allocation_order_end(*mf_);
TargetRegisterClass::iterator i = RC->allocation_order_begin(*mf_);
while (reservedRegs_.test(*i) && i != aoe)
++i;
assert(i != aoe && "All registers reserved?!");
physReg = *i;
}
if (!physReg)
physReg = getFirstNonReservedPhysReg(RC);
DEBUG(dbgs() << tri_->getName(physReg) << '\n');
// Note the register is not really in use.
vrm_->assignVirt2Phys(cur->reg, physReg);
@ -1168,15 +1173,7 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
minWeight = RegsWeights[0].second;
if (minWeight == HUGE_VALF) {
// All registers must have inf weight. Just grab one!
if (BestPhysReg == 0) {
TargetRegisterClass::iterator aoe = RC->allocation_order_end(*mf_);
TargetRegisterClass::iterator i = RC->allocation_order_begin(*mf_);
while (reservedRegs_.test(*i) && i != aoe)
++i;
assert(i != aoe && "All registers reserved?!");
minReg = *i;
} else
minReg = BestPhysReg;
minReg = BestPhysReg ? BestPhysReg : getFirstNonReservedPhysReg(RC);
if (cur->weight == HUGE_VALF ||
li_->getApproximateInstructionCount(*cur) == 0) {
// Spill a physical register around defs and uses.