70905e0afa
`Constant::isZeroValue` currently behaves same as `Constant::isNullValue` for all types except floating-point, where it additionally returns true for negative zero (`-0.0`). However, in practice, almost all callers operate on integer/pointer types where the two are equivalent, and the few FP-relevant callers have no meaningful dependence on the `-0.0` behavior. This PR removes `isZeroValue` to eliminate the confusing API. All callers are changed to `isNullValue` with no test failures. `isZeroValue` will be reintroduced in a future change with clearer semantics: when null pointers may have non-zero bit patterns, `isZeroValue` will check for bitwise-all-zeros, while `isNullValue` will check for the semantic null (which may be non-zero).
Polly - Polyhedral optimizations for LLVM ----------------------------------------- http://polly.llvm.org/ Polly uses a mathematical representation, the polyhedral model, to represent and transform loops and other control flow structures. Using an abstract representation it is possible to reason about transformations in a more general way and to use highly optimized linear programming libraries to figure out the optimal loop structure. These transformations can be used to do constant propagation through arrays, remove dead loop iterations, optimize loops for cache locality, optimize arrays, apply advanced automatic parallelization, drive vectorization, or they can be used to do software pipelining.