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Add an option to control this heuristic tweak so I can test it. 

llvm-svn: 44671
This commit is contained in:
Evan Cheng 2007-12-07 00:28:32 +00:00
parent 2bbd03a755
commit 85cdba29b0
1 changed files with 6 additions and 1 deletions
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7
llvm/lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -52,6 +52,11 @@ namespace {
cl::desc("Use new coalescer heuristic"),
cl::init(false));
static cl::opt<bool>
ReMatSpillWeight("tweak-remat-spill-weight",
cl::desc("Tweak spill weight of re-materializable intervals"),
cl::init(true));
RegisterPass<SimpleRegisterCoalescing>
X("simple-register-coalescing", "Simple Register Coalescing");
@ -1487,7 +1492,7 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
LI.weight = HUGE_VALF;
else {
bool isLoad = false;
if (li_->isReMaterializable(LI, isLoad)) {
if (ReMatSpillWeight && li_->isReMaterializable(LI, isLoad)) {
// If all of the definitions of the interval are re-materializable,
// it is a preferred candidate for spilling. If non of the defs are
// loads, then it's potentially very cheap to re-materialize.