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Add BSWAP64 macro.

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This is like BSWAP32, but for 64-bit values.  Since we've got two of
them now and they have use cases (like sortsupport) beyond CRCs, move
the definitions to their own header file.

Peter Geoghegan
This commit is contained in:
Robert Haas
2015-10-08 13:01:36 -04:00
parent 1e35319861
commit c171818b27
7 changed files with 97 additions and 10 deletions
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18
config/c-compiler.m4
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@ -214,6 +214,24 @@ fi])# PGAC_C_BUILTIN_BSWAP32
# PGAC_C_BUILTIN_BSWAP64
# -------------------------
# Check if the C compiler understands __builtin_bswap64(),
# and define HAVE__BUILTIN_BSWAP64 if so.
AC_DEFUN([PGAC_C_BUILTIN_BSWAP64],
[AC_CACHE_CHECK(for __builtin_bswap64, pgac_cv__builtin_bswap64,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static unsigned long int x = __builtin_bswap64(0xaabbccddeeff0011);]
)],
[pgac_cv__builtin_bswap64=yes],
[pgac_cv__builtin_bswap64=no])])
if test x"$pgac_cv__builtin_bswap64" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_BSWAP64, 1,
[Define to 1 if your compiler understands __builtin_bswap64.])
fi])# PGAC_C_BUILTIN_BSWAP64
# PGAC_C_BUILTIN_CONSTANT_P
# -------------------------
# Check if the C compiler understands __builtin_constant_p(),