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Add experimental -disable-physical-join command line option.

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Eventually, we want to disable physreg coalescing completely, and let the
register allocator do its job using hints.

This option makes it possible to measure the impact of disabling physreg
coalescing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-08-31 01:27:49 +00:00
parent 49998ce46a
commit e49e6a852b
1 changed files with 10 additions and 0 deletions
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10
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -59,6 +59,11 @@ DisableCrossClassJoin("disable-cross-class-join",
cl::desc("Avoid coalescing cross register class copies"),
cl::init(false), cl::Hidden);
static cl::opt<bool>
DisablePhysicalJoin("disable-physical-join",
cl::desc("Avoid coalescing physical register copies"),
cl::init(false), cl::Hidden);
INITIALIZE_AG_PASS(SimpleRegisterCoalescing, RegisterCoalescer,
"simple-register-coalescing", "Simple Register Coalescing",
false, false, true);
@ -1036,6 +1041,11 @@ bool SimpleRegisterCoalescing::JoinCopy(CopyRec &TheCopy, bool &Again) {
return false; // Not coalescable.
}
if (DisablePhysicalJoin && CP.isPhys()) {
DEBUG(dbgs() << "\tPhysical joins disabled.\n");
return false;
}
DEBUG(dbgs() << "\tConsidering merging %reg" << CP.getSrcReg());
// Enforce policies.