Simon Pilgrim 54b20cbb95
[DAG] computeKnownBits - abds(x, y) will be zero in the upper bits if x and y are sign-extended (#94448)
As reported on #94442 - if x and y have more than one signbit, then the upper bits of its absolute value are guaranteed to be zero

Sibling PR to #94382

Alive2: https://alive2.llvm.org/ce/z/7_z2Vc

Fixes #94442
2024-06-05 11:57:55 +01:00
..
2023-08-08 21:59:53 +01:00

++ SVE CodeGen Warnings ++

When the WARN check lines fail in the SVE codegen tests it most likely means you
have introduced a warning due to:
1. Adding an invalid call to VectorType::getNumElements() or EVT::getVectorNumElements()
   when the type is a scalable vector.
2. Relying upon an implicit cast conversion from TypeSize to uint64_t.

For generic code, please modify your code to work with ElementCount and TypeSize directly.
For target-specific code that only deals with fixed-width vectors, use the fixed-size interfaces.
Please refer to the code where those functions live for more details.