Usage of uninitialized memory is a top memory safety issue in C++ codebases.
Help mitigate this somewhat by default initialize stack allocations to a
pattern (0xAA repeating).
Clang has received optimizations to sink these into control flow paths that
access such values to minimize the overhead of these added initializations.
If there's a measurable slowdown, we can add
-ftrivial-auto-var-init-max-size=<N> for some value N bytes if we have any
large stack allocations, or add attribute uninitialized to any variable
declarations.
Unsupported until GCC 12.1 / Clang 8.
Increases file size of libc.a from a full build by +8.79Ki (+0.2%).
GCC complains about "type qualifiers ignored on cast result type".
Upon investigation the correct fix was to remove all `volatile` and use the `-frounding-math` option.
As of the Bazel 6.x series, there is no difference between the
`exec_tools` and `tools`. Bazel 7 removes the `exec_tools` attribute
entirely. This commit updates to use the cannonical attribute name to
allow building `clang-tidy``with bazel 7.0.0, though it does not change
the default bazel version which remains at 6.1.2.
See also https://github.com/bazelbuild/bazel/issues/19132 for more
information.
This patch removes the `FPBits` specialization for x86 Extended Precision by moving it up to `FPRep`.
It also introduces enums (`Exponent`, `BiasedExponent` and `Significand`) to represent the exponent and significant parts of the floating point numbers. These enums are used to construct and observe floating point representations.
Additionally, we remove `LongDoubleBits.h` that is now unnecessary.
Make it so that PDL in pattern rewrites can be optionally disabled.
PDL is still enabled by default and not optional bazel. So this should
be a NOP for most folks, while enabling other to disable.
This only works with tests disabled. With tests enabled this still
compiles but tests fail as there is no lit config to disable tests that
depend on PDL rewrites yet.
Make it so that PDL in pattern rewrites can be optionally disabled.
PDL is still enabled by default and not optional bazel. So this should
be a NOP for most folks, while enabling other to disable.
This is piped through mlir-tblgen invocation and that could be
changed/avoided by splitting up the passes file instead.
This only works with tests disabled. With tests enabled this still
compiles but tests fail as there is no lit config to disable tests that
depend on PDL rewrites yet.
