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d9f033146b
The 'errno' value is most likely not useful on the GPU and it prevents
us from providing certain functions on the GPU that depend on it, like
`atoi`. This patch makes the necessary changes to support `errno` by
simple replacing it with a consumer class.
Supporting `errno` on the GPU is possible in some aspects. The first
approach would be to use a buffer of shared memory that has enough space
for all threads. Another option would be to change code generation to
support `thread_local` using `address_space(5)` memory allocated at
kernel launch. The former could look like the following, which could be
implemented in a later patch:
```
template <typename T>
using SharedBuffer = T[gpu::MAX_THREADS] [[clang::address_space(3)]];
template <typename T> struct ErrnoSetter {
constexpr ErrnoSetter(SharedBuffer<T> &storage) : storage(storage) {}
SharedBuffer<T> &storage;
void operator=(const T &val) { storage[gpu::get_thread_id()] = val; }
};
static SharedBuffer<int> thread_local_buffer [[clang::loader_uninitialized]];
ErrnoSetter<int> __llvmlibc_internal_errno(thread_local_buffer);
```
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D149107
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| .. | ||
| arpa | ||
| llvm-libc-macros | ||
| llvm-libc-types | ||
| sys | ||
| __llvm-libc-common.h | ||
| assert.h.def | ||
| CMakeLists.txt | ||
| ctype.h.def | ||
| dirent.h.def | ||
| errno.h.def | ||
| fcntl.h.def | ||
| fenv.h.def | ||
| inttypes.h.def | ||
| math.h.def | ||
| pthread.h.def | ||
| sched.h.def | ||
| setjmp.h.def | ||
| signal.h.def | ||
| spawn.h.def | ||
| stdio.h.def | ||
| stdlib.h.def | ||
| string.h.def | ||
| strings.h.def | ||
| termios.h.def | ||
| threads.h.def | ||
| time.h.def | ||
| unistd.h.def | ||
| wchar.h.def | ||