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try harder to find a suitable stack frame site in pickTarget when there are no free registers left

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This commit is contained in:
Joel Dice 2009-03-16 20:03:59 -06:00
parent 7433abd402
commit c9400316fd
1 changed files with 27 additions and 1 deletions
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28
src/compiler.cpp
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@ -1153,7 +1153,7 @@ pickFrameTarget(Context* c, Value* v)
do {
if (p->home >= 0) {
Target mine(p->home, MemoryOperand, frameCost(c, v, p->home));
if (mine.cost == 0) {
if (mine.cost == 1) {
return mine;
} else if (mine.cost < best.cost) {
best = mine;
@ -1165,6 +1165,24 @@ pickFrameTarget(Context* c, Value* v)
return best;
}
Target
pickAnyFrameTarget(Context* c, Value* v)
{
Target best;
unsigned count = usableFrameSize(c) + c->parameterFootprint;
for (unsigned i = 0; i < count; ++i) {
Target mine(i, MemoryOperand, frameCost(c, v, i));
if (mine.cost == 1) {
return mine;
} else if (mine.cost < best.cost) {
best = mine;
}
}
return best;
}
Target
pickTarget(Context* c, Read* read, bool intersectRead,
unsigned registerReserveCount)
@ -1221,6 +1239,14 @@ pickTarget(Context* c, Read* read, bool intersectRead,
}
}
if (best.cost > 3 and c->availableRegisterCount == 0) {
// there are no free registers left, so moving from memory to
// memory isn't an option - try harder to find an available frame
// site:
best = pickAnyFrameTarget(c, read->value);
assert(c, best.cost <= 3);
}
return best;
}