This patch updates SCCP to use the value ranges of AddInst operands to
try to prove the AddInst does not overflow in the signed sense and
adds the NSW flag. The reasoning is done with
makeGuaranteedNoWrapRegion (thanks @nikic for point it out!).
Follow-ups will include extending this to more
OverflowingBinaryOperators.
Depends on D142387.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D142390
This reverts commit 531756b9544b3e164b9ab998292fce3ebbc7c746.
The recommitted version fixes a crash when one of the operands is a
constant other than a ConstantInt. Test for that case have been added
in 5b16cd97b8e1c273.
It splits off the new logic into a separate function because setting the
flags is quite different compared to the other cases handled in replaceSignedInst
which all require replacing an existing instruction.
It also guards makeGuaranteedNoWrapRegion by `if (!Inst.hasNoUnsignedWrap())`
as discussed in the review.
Fixes#60280.
Fixes#60278.
Original message:
This patch updates SCCP to use the value ranges of AddInst operands to
try to prove the AddInst does not overflow in the unsigned sense and
adds the NUW flag. The reasoning is done with
makeGuaranteedNoWrapRegion (thanks @nikic for point it out!).
Follow-ups will include adding NSW and extension to more
OverflowingBinaryOperators.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D142387
This reverts commit 366e1faa2fffd5b2284e25b09b6a26bcd2aca2b7.
It looks like this exposes another set of crashes on the buildbots.
Revert while I investigate.
The recommitted version fixes a crash when one of the operands is a
constant other than a ConstantInt. Test for that case have been added
in 5b16cd97b8e1c273.
It splits off the new logic into a separate function because setting the
flags is quite different compared to the other cases handled in replaceSignedInst
which all require replacing an existing instruction. Instructions are
now refined before any replacements are done, which has the advantage
that we should have lattice values for all operands (fixing the crashes
and simplifies the logic) and also allows optimizing more cases where one
of the operands also gets replaced (see improvements in
@sge_with_sext_to_zext_conversion).
It also guards makeGuaranteedNoWrapRegion by `if (!Inst.hasNoUnsignedWrap())`
as discussed in the review.
Fixes#60280.
Fixes#60278.
Original message:
This patch updates SCCP to use the value ranges of AddInst operands to
try to prove the AddInst does not overflow in the unsigned sense and
adds the NUW flag. The reasoning is done with
makeGuaranteedNoWrapRegion (thanks @nikic for point it out!).
Follow-ups will include adding NSW and extension to more
OverflowingBinaryOperators.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D142387
This reverts commit de122cb920080fd9e24b2777114271fbef932d5e.
This change causes assertion failures in many of our internal tests.
I have filed #60280 for this issue.
This patch updates SCCP to use the value ranges of AddInst operands to
try to prove the AddInst does not overflow in the unsigned sense and
adds the NUW flag. The reasoning is done with
makeGuaranteedNoWrapRegion (thanks @nikic for point it out!).
Follow-ups will include adding NSW and extension to more
OverflowingBinaryOperators.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D142387
The legacy PM is deprecated, so update a bunch of lit tests running
opt to use the new PM syntax when specifying the pipeline.
In this patch focus has been put on test cases for ConstantMerge,
ConstraintElimination, CorrelatedValuePropagation, GlobalDCE,
GlobalOpt, SCCP, TailCallElim and PredicateInfo.
Differential Revision: https://reviews.llvm.org/D114516
