[PATCH v3 0/5] bswap.h: Rework ntohl handling

Hi,

this series continues the rework of the bswap32/64()/ nothl() handling. 

I've been looking at recent compiler and they manage to recognize the manual shifting and use an optimize opcode if available. The ntohl version provided by glibc already provides an "optimized" version which makes an optimisation in git almost not needed. One of the motivation behind overwriting/ providing an optimized version was to provide a macro instead of using a function call. One libc that is still providing ntohl as a function call is musl.

While ntohl() is provided by the libc, the ntohll() is not. I found it only on Windows provided by winsock.h.

I haven't touched the put/get_be*() macros. gcc & clang are both smart enough to swap the content accordingly and perform a single store/ load. Only the msvc seems to strugle here and performs multiple bytes stores/ loads and shifts.

v2…v3 https://lore.kernel.org/all/20250611221444.1567638-1-sebastian@breakpoint.cc/
  - Fixed typos in the patch description

Sebastian Andrzej Siewior (5):
  bswap.h: Add support for __BYTE_ORDER__
  bswap.h: Define GIT_LITTLE_ENDIAN on msvc as little endian
  bswap.h: Always overwrite ntohl/ ntohll macros
  bswap.h: Remove optimized x86 version of bswap32/64
  bswap.h: Provide a built-in based version of bswap32/64 if possible

 compat/bswap.h | 114 +++++++++++++++++++++----------------------------
 1 file changed, 48 insertions(+), 66 deletions(-)