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[Attributor][NFCI] Do not track unnecessary dependences 

If we do not look at assumed information there is no need to track
dependences.
This commit is contained in:
Johannes Doerfert 2019-11-02 14:47:45 -05:00
parent 680f638027
commit 77a6b358b5
1 changed files with 8 additions and 3 deletions
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11
llvm/lib/Transforms/IPO/Attributor.cpp
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@ -1685,7 +1685,10 @@ static int64_t getKnownNonNullAndDerefBytesForUse(
unsigned ArgNo = ICS.getArgumentNo(U);
IRPosition IRP = IRPosition::callsite_argument(ICS, ArgNo);
auto &DerefAA = A.getAAFor<AADereferenceable>(QueryingAA, IRP);
// As long as we only use known information there is no need to track
// dependences here.
auto &DerefAA = A.getAAFor<AADereferenceable>(QueryingAA, IRP,
/* TrackDependence */ false);
IsNonNull |= DerefAA.isKnownNonNull();
return DerefAA.getKnownDereferenceableBytes();
}
@ -1718,8 +1721,10 @@ static int64_t getKnownNonNullAndDerefBytesForUse(
GetPointerBaseWithConstantOffset(UseV, Offset, DL,
/*AllowNonInbounds*/ false)) {
if (Base == &AssociatedValue) {
auto &DerefAA =
A.getAAFor<AADereferenceable>(QueryingAA, IRPosition::value(*Base));
// As long as we only use known information there is no need to track
// dependences here.
auto &DerefAA = A.getAAFor<AADereferenceable>(
QueryingAA, IRPosition::value(*Base), /* TrackDependence */ false);
IsNonNull |= (!NullPointerIsDefined && DerefAA.isKnownNonNull());
IsNonNull |= (!NullPointerIsDefined && (Offset != 0));
int64_t DerefBytes = DerefAA.getKnownDereferenceableBytes();