string: Use builtins for ffs and ffsll

It allows to remove a lot of arch-specific implementations.

Checked on x86_64, aarch64, powerpc64.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

3 files changed, 6 insertions, 82 deletions

diff --git a/sysdeps/powerpc/ffs.c b/sysdeps/powerpc/ffs.c
deleted file mode 100644
index 9614d48da2..0000000000
--- a/sysdeps/powerpc/ffs.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* Find first set bit in a word, counted from least significant end.
-   For PowerPC.
-   Copyright (C) 1991-2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define ffsl __something_else
-#include <limits.h>
-#include <string.h>
-
-#undef	ffs
-
-#ifdef 	__GNUC__
-
-int
-__ffs (int x)
-{
-  int cnt;
-
-  asm ("cntlzw %0,%1" : "=r" (cnt) : "r" (x & -x));
-  return 32 - cnt;
-}
-weak_alias (__ffs, ffs)
-libc_hidden_def (__ffs)
-libc_hidden_builtin_def (ffs)
-#if ULONG_MAX == UINT_MAX
-#undef ffsl
-weak_alias (__ffs, ffsl)
-#endif
-
-#else
-#include <string/ffs.c>
-#endif
diff --git a/sysdeps/powerpc/math-use-builtins-ffs.h b/sysdeps/powerpc/math-use-builtins-ffs.h
new file mode 100644
index 0000000000..7b1d401823
--- /dev/null
+++ b/sysdeps/powerpc/math-use-builtins-ffs.h
@@ -0,0 +1,6 @@
+#define USE_FFS_BUILTIN    1
+#ifdef __powerpc64__
+# define USE_FFSLL_BUILTIN 1
+#else
+# define USE_FFSLL_BUILTIN 0
+#endif
diff --git a/sysdeps/powerpc/powerpc64/ffsll.c b/sysdeps/powerpc/powerpc64/ffsll.c
deleted file mode 100644
index a8f0c30058..0000000000
--- a/sysdeps/powerpc/powerpc64/ffsll.c
+++ /dev/null
@@ -1,36 +0,0 @@
-/* Find first set bit in a word, counted from least significant end.
-   For PowerPC.
-   Copyright (C) 1991-2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define ffsl __something_else
-#include <limits.h>
-#include <string.h>
-
-#undef	ffs
-
-int
-__ffsll (long long int x)
-{
-  int cnt;
-
-  asm ("cntlzd %0,%1" : "=r" (cnt) : "r" (x & -x));
-  return 64 - cnt;
-}
-weak_alias (__ffsll, ffsll)
-#undef ffsl
-weak_alias (__ffsll, ffsl)