[all-commits] [llvm/llvm-project] 40effc: [libc] Implement (v|f)printf on the GPU (#96369)

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 40effc7af5679b7d54d3176a5eef2cdee1962ecd
      https://github.com/llvm/llvm-project/commit/40effc7af5679b7d54d3176a5eef2cdee1962ecd
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2024-07-12 (Fri, 12 Jul 2024)

  Changed paths:
    M libc/config/gpu/entrypoints.txt
    M libc/include/llvm-libc-types/rpc_opcodes_t.h
    M libc/src/__support/arg_list.h
    M libc/src/gpu/rpc_fprintf.cpp
    M libc/src/stdio/CMakeLists.txt
    R libc/src/stdio/fprintf.cpp
    M libc/src/stdio/generic/CMakeLists.txt
    A libc/src/stdio/generic/fprintf.cpp
    A libc/src/stdio/generic/vfprintf.cpp
    M libc/src/stdio/gpu/CMakeLists.txt
    A libc/src/stdio/gpu/fprintf.cpp
    A libc/src/stdio/gpu/printf.cpp
    A libc/src/stdio/gpu/vfprintf.cpp
    A libc/src/stdio/gpu/vfprintf_utils.h
    A libc/src/stdio/gpu/vprintf.cpp
    R libc/src/stdio/vfprintf.cpp
    M libc/test/integration/src/stdio/gpu/CMakeLists.txt
    R libc/test/integration/src/stdio/gpu/printf.cpp
    A libc/test/integration/src/stdio/gpu/printf_test.cpp
    M libc/test/src/stdio/CMakeLists.txt
    M libc/utils/gpu/server/rpc_server.cpp

  Log Message:
  -----------
  [libc] Implement (v|f)printf on the GPU (#96369)

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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