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changeset 15946:d0eb709725f5

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ffsl, ffsll: Optimize for GCC. * lib/ffsl.h (FUNC): Use GCC_BUILTIN if defined. * lib/ffsl.c (GCC_BUILTIN): New macro. * lib/ffsll.c (GCC_BUILTIN): Likewise.
author Bruno Haible <bruno@clisp.org>
date Fri, 14 Oct 2011 00:48:29 +0200
parents f914ec364e88
children d1ff4390df13
files ChangeLog lib/ffsl.c lib/ffsl.h lib/ffsll.c
diffstat 4 files changed, 13 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2011-10-13  Bruno Haible  <bruno@clisp.org>
+
+	ffsl, ffsll: Optimize for GCC.
+	* lib/ffsl.h (FUNC): Use GCC_BUILTIN if defined.
+	* lib/ffsl.c (GCC_BUILTIN): New macro.
+	* lib/ffsll.c (GCC_BUILTIN): Likewise.
+
 2011-10-13  Bruno Haible  <bruno@clisp.org>
 
 	ffs, bcopy, memset: Support symbol renaming via config.h.
--- a/lib/ffsl.c
+++ b/lib/ffsl.c
@@ -1,3 +1,4 @@
 #define FUNC ffsl
 #define TYPE long int
+#define GCC_BUILTIN __builtin_ffsl
 #include "ffsl.h"
--- a/lib/ffsl.h
+++ b/lib/ffsl.h
@@ -31,6 +31,9 @@
 int
 FUNC (TYPE i)
 {
+#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) && defined GCC_BUILTIN
+  return GCC_BUILTIN (i);
+#else
   int result = 0;
   unsigned TYPE j = i;
 
@@ -44,4 +47,5 @@
       j >>= CHAR_BIT * sizeof (unsigned int);
       result += CHAR_BIT * sizeof (unsigned int);
     }
+#endif
 }
--- a/lib/ffsll.c
+++ b/lib/ffsll.c
@@ -1,3 +1,4 @@
 #define FUNC ffsll
 #define TYPE long long int
+#define GCC_BUILTIN __builtin_ffsll
 #include "ffsl.h"