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Add expect.h to Replace Direct Uses of __builtin_expect() #86

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Add expect.h to Replace Direct Uses of __builtin_expect() #86

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7de397f
Add expect.h to readably handle compiler branch hints.
Lightning11wins Feb 28, 2026
c8ff087
Replace uses of __builtin_expect() with LIKELY() and UNLIKELY() from …
Lightning11wins Feb 28, 2026
7b83d77
Add compiler hints in obvious cases (such as unlikely error checks).
Lightning11wins Feb 28, 2026
0367ff3
Fix a critical bug that caused expect.h to never provide optimization.
Lightning11wins Feb 28, 2026
4b53d7f
Add HAVE_BUILTIN_EXPECT macro to indicate when __builtin_expect() is …
Lightning11wins Mar 6, 2026
9a03531
Update copywrite notice in modified files.
Lightning11wins Mar 6, 2026
099c390
Fix bug where HAVE_BUILTIN_EXPECT was not implemented for centrallix-…
Lightning11wins Mar 6, 2026
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ centrallix/test_obj
centrallix/test_prt
centrallix-os/apps/kardia
centrallix-lib/include/cxlib
/centrallix-lib/autom4te.cache
*/nbproject/
centrallix-lib/tests/test_*.bin
centrallix/tests/*.out
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14 changes: 14 additions & 0 deletions centrallix-lib/aclocal.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,20 @@ AC_DEFUN(CHECK_MAKEDEPEND,
]
)

dnl check if gcc allows __builtin_expect()
AC_DEFUN(CHECK_BUILTIN_EXPECT,
[
AC_MSG_CHECKING(if __builtin_expect is available)
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [__builtin_expect(0, 0)])],
[
AC_DEFINE([HAVE_BUILTIN_EXPECT], [1], [Define if __builtin_expect is available])
AC_MSG_RESULT([yes])
],
[AC_MSG_RESULT([no])],
)
]
)

dnl check if gcc allows -fPIC and -pg at the same time
AC_DEFUN(CHECK_PROFILE,
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