[LLVM][AArch64] Change SVE CodeGen tests to use splat().
The affected tests were using the longwinded syntax for constant
splats. By using the splat() syntax the tests get simplified whilst
also removing the need for "undef".
[SVE] Extend isel pattern coverage for BIC.
Adds patterns of the form "(and a, (not b)) -> bic".
NOTE: With this support I'm inclined to remove AArch64ISD::BIC,
but will leave that investigation for another time.
Differential Revision: https://reviews.llvm.org/D118365
[DAGCombiner] Support fold zero scalar vector.
This patch changes ISD::isBuildVectorAllZeros to
ISD::isConstantSplatVectorAllZeros which handles zero sclar vector.
TestPlan: check-llvm
Differential Revision: https://reviews.llvm.org/D100813
[SVE] Remove checks for warnings in scalable-vector tests.
After D98856 these tests will by default break (fatal_error) if any of
the wrong interfaces are used, so there's no longer a need to have a
RUN line that checks for a warning message emitted by the compiler.
[SVE][CodeGen] Add README for SVE-related warnings in tests
I have added a new file:
llvm/test/CodeGen/AArch64/README
that describes what to do in the event one of the SVE codegen tests
fails the warnings check. In addition, I've added comments to all
the relevant SVE tests pointing users at the README file.
Differential Revision: https://reviews.llvm.org/D83467
[CodeGen] Fix SimplifyDemandedBits for scalable vectors
For now I have changed SimplifyDemandedBits and it's various callers
to assume we know nothing for scalable vectors and to ignore the
demanded bits completely. I have also done something similar for
SimplifyDemandedVectorElts. These changes fix up lots of warnings
due to calls to EVT::getVectorNumElements() for types with scalable
vectors. These functions are all used for optimisations, rather than
functional requirements. In future we can revisit this code if
there is a need to improve code quality for SVE.
Differential Revision: https://reviews.llvm.org/D80537
[AArch64][SVE] Add support for fcmp.
This also requires support for boolean "not", so I added boolean logic
while I was there.
Differential Revision: https://reviews.llvm.org/D76901
