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authorAdhemerval Zanella Netto <adhemerval.zanella@linaro.org>2023-08-25 13:30:58 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2024-02-01 09:31:33 -0300
commitae4b8d6a0e0dc502e3d8307474a2e5691b7434da (patch)
tree8e8d958ebb90b9edec3847a53364edb32a2314a3 /string/ffsll.c
parent26d01172f5c3f3b912ecf21ebb911eb5351bba4d (diff)
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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>
Diffstat (limited to 'string/ffsll.c')
-rw-r--r--string/ffsll.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/string/ffsll.c b/string/ffsll.c
index 7d16250026..0ec39a0c56 100644
--- a/string/ffsll.c
+++ b/string/ffsll.c
@@ -18,20 +18,26 @@
 #include <limits.h>
 #define ffsl __something_else
 #include <string.h>
-
 #undef	ffsll
+#include <math-use-builtins.h>
+#include <libc-diag.h>
 
 /* Find the first bit set in I.  */
 int
-ffsll (long long int i)
+__ffsll (long long int i)
 {
+#if USE_FFSLL_BUILTIN
+  return __builtin_ffsll (i);
+#else
   unsigned long long int x = i & -i;
 
   if (x <= 0xffffffff)
     return ffs (i);
   else
     return 32 + ffs (i >> 32);
+#endif
 }
+weak_alias (__ffsll, ffsll)
 
 #if ULONG_MAX != UINT_MAX
 #undef ffsl