These ifs were missing a case for f80 which should have shifted by one,
but we can just compute the correct value instead. Also, we want the
fractional bits to be a multiple of four, not the mantissa bits, since
the mantissa could have a leading one which we want to be separated.
This makes it easier to understand how control flow should happen in
various cases; already just by doing this it is revealed that
UndefinedSymbol and UndefinedSymbolReference should be merged, and that
MissingMainEntrypoint should be removed in favor of the ErrorFlags
mechanism thath we already have for missing the main entrypoint.
The main motivation for this change, however, is preventing a compile
error when there is conditional compilation inside linker
implementations, causing the flush() error set to depend on compilation
options. With this change, the error set is fixed, and, notably, the
`-Donly-c` flag no longer has compilation errors due to this error set.
This option can be used to produce a C backend build of the self-hosted
compiler, which only has the C backend enabled. Once the C backend is
capable of self-hosting, this will be a way for us to replace our stage1
codebase with a C backend build of self-hosted, which we can then use
for bootstrapping. See #5246 for more details.
Using this option right now results in a crash because the C backend is
not yet passing all the behavior tests.
CMake recognizes the CMAKE_PREFIX_PATH environment variable for some
things, and also the CMAKE_PREFIX_PATH cache variable for other things.
However, it does not relate these two things, i.e. if the environment
variable is set, CMake does not populate the cache variable in a
corresponding manner. Some package systems, such as Homebrew, set the
environment variable but not the cache variable. Furthermore, the
environment variable follows the system path separator, such as ':' on
POSIX and ';' on Windows, but the cache variable follows CMake's array
behavior, i.e. always ';' for a separator.
Closes#13242
This documents status of routines and adds the next work item
"Decimal float library routines", which are only recommended for
binary data. Complete absence of tests is also documented.
This does not document the various aliases, e.g. those for ARM.
Missing Integer library routines:
- __addvsi3
- __addvdi3
- __addvti3
- __addvdi3
- __addvti3
- __subvsi3
- __subvdi3
- __subvti3
- __subvdi3
- __subvti3
- __mulvsi3
- __mulvdi3
- __mulvti3
- __mulvdi3
- __mulvti3
Missing floating library routines:
- __powisf2
- __powidf2
- __powitf2
- __powixf2
Missing routines for symbol-level compatibility to gcc:
- __ashlsi3
- __ashrsi3
- __lshrsi3
cmp.zig was accidently being referenced twice, rather than importing
memcmp.zig. This means that its symbols were also not included in
the generated compiler-rt output.
