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

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44671 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-12-07 00:28:32 +00:00
parent 1076210ee3
commit dfb1561434
1 changed files with 6 additions and 1 deletions
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7
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@@ -52,6 +52,11 @@ namespace {
cl::desc("Use new coalescer heuristic"), cl::desc("Use new coalescer heuristic"),
cl::init(false)); 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> RegisterPass<SimpleRegisterCoalescing>
X("simple-register-coalescing", "Simple Register Coalescing"); X("simple-register-coalescing", "Simple Register Coalescing");
@@ -1487,7 +1492,7 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
LI.weight = HUGE_VALF; LI.weight = HUGE_VALF;
else { else {
bool isLoad = false; 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, // If all of the definitions of the interval are re-materializable,
// it is a preferred candidate for spilling. If non of the defs are // it is a preferred candidate for spilling. If non of the defs are
// loads, then it's potentially very cheap to re-materialize. // loads, then it's potentially very cheap to re-materialize.