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-rw-r--r--src/vppinfra/clib.h63
1 files changed, 6 insertions, 57 deletions
diff --git a/src/vppinfra/clib.h b/src/vppinfra/clib.h
index 0d059a0778b..42748b0a34c 100644
--- a/src/vppinfra/clib.h
+++ b/src/vppinfra/clib.h
@@ -125,71 +125,20 @@
decl
/* Use __builtin_clz if available. */
-#ifdef __GNUC__
-#include <features.h>
-#if __GNUC_PREREQ(3, 4)
#if uword_bits == 64
-#define count_leading_zeros(count,x) count = __builtin_clzll (x)
-#define count_trailing_zeros(count,x) count = __builtin_ctzll (x)
+#define count_leading_zeros(x) __builtin_clzll (x)
+#define count_trailing_zeros(x) __builtin_ctzll (x)
#else
-#define count_leading_zeros(count,x) count = __builtin_clzl (x)
-#define count_trailing_zeros(count,x) count = __builtin_ctzl (x)
+#define count_leading_zeros(x) __builtin_clzl (x)
+#define count_trailing_zeros(x) __builtin_ctzl (x)
#endif
-#endif
-#endif
-
-#ifndef count_leading_zeros
-
-/* Misc. integer arithmetic functions. */
-#if defined (i386)
-#define count_leading_zeros(count, x) \
- do { \
- word _clz; \
- __asm__ ("bsrl %1,%0" \
- : "=r" (_clz) : "rm" ((word) (x)));\
- (count) = _clz ^ 31; \
- } while (0)
-
-#define count_trailing_zeros(count, x) \
- __asm__ ("bsfl %1,%0" : "=r" (count) : "rm" ((word)(x)))
-#endif /* i386 */
-
-#if defined (__alpha__) && defined (HAVE_CIX)
-#define count_leading_zeros(count, x) \
- __asm__ ("ctlz %1,%0" \
- : "=r" ((word) (count)) \
- : "r" ((word) (x)))
-#define count_trailing_zeros(count, x) \
- __asm__ ("cttz %1,%0" \
- : "=r" ((word) (count)) \
- : "r" ((word) (x)))
-#endif /* alpha && HAVE_CIX */
-
-#if __mips >= 4
-
-/* Select between 32/64 opcodes. */
-#if uword_bits == 32
-#define count_leading_zeros(_count, _x) \
- __asm__ ("clz %[count],%[x]" \
- : [count] "=r" ((word) (_count)) \
- : [x] "r" ((word) (_x)))
-#else
-#define count_leading_zeros(_count, _x) \
- __asm__ ("dclz %[count],%[x]" \
- : [count] "=r" ((word) (_count)) \
- : [x] "r" ((word) (_x)))
-#endif
-
-#endif /* __mips >= 4 */
-
-#endif /* count_leading_zeros */
#if defined (count_leading_zeros)
always_inline uword
min_log2 (uword x)
{
uword n;
- count_leading_zeros (n, x);
+ n = count_leading_zeros (x);
return BITS (uword) - n - 1;
}
#else
@@ -305,7 +254,7 @@ log2_first_set (uword x)
{
uword result;
#ifdef count_trailing_zeros
- count_trailing_zeros (result, x);
+ result = count_trailing_zeros (x);
#else
result = min_log2 (first_set (x));
#endif