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https://github.com/llvm/llvm-project/issues/159474
Another try of trying to land
https://github.com/llvm/llvm-project/pull/166382
- Fix some leftover tests checking for specific errnos
- Guard errno checking tests to not run on the GPU
@michaelrj-google
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https://github.com/llvm/llvm-project/issues/159474
Resubmitting https://github.com/llvm/llvm-project/pull/162876 with fixes
as it broke some buildbots:
- Fix comparisons of integer expressions of different signedness
- Not check for specific errnos in tests, as they might not be available
on all platforms
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[#159474](https://github.com/llvm/llvm-project/issues/159474)
- All printf variants set errno and consistently return -1 on error,
instead of returning various predefined error codes
- Return value overflow handling is added
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Summary:
This patch implements the `printf` family of functions on the GPU using
the new variadic support. This patch adapts the old handling in the
`rpc_fprintf` placeholder, but adds an extra RPC call to get the size of
the buffer to copy. This prevents the GPU from needing to parse the
string. While it's theoretically possible for the pass to know the size
of the struct, it's prohibitively difficult to do while maintaining ABI
compatibility with NVIDIA's varargs.
Depends on https://github.com/llvm/llvm-project/pull/96015.
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