diff -Naurp dietlibc-0.32-20090113/test/cycles.c dietlibc-0.32-20090113.oden/test/cycles.c
--- dietlibc-0.32-20090113/test/cycles.c	2004-08-24 12:10:48.000000000 +0200
+++ dietlibc-0.32-20090113.oden/test/cycles.c	2009-01-28 22:26:54.000000000 +0100
@@ -12,6 +12,16 @@
   asm volatile ("rdtsc" : "=a" (l), "=d" (h)); \
   dst = (((uint64_t)h) << 32) | l;                             \
 } while (0)
+#elif defined (__powerpc64__)
+#define RDTSC(dst) asm volatile ("mftb %0" : "=r" (dst))
+#elif defined (__powerpc__)
+#define RDTSC(dst) do { \
+  uint32_t chk, tbl, tbu; \
+  /* The code below is as suggested in Motorola reference manual for 32 bits PPCs. */ \
+  __asm__ __volatile__ ("1: mftbu %0; mftb %1; mftbu %2; cmpw %2,%0; bne 1b" \
+    : "=r" (tbu), "=r" (tbl), "=r" (chk) ); \
+  dst = ((uint64_t)tbu << 32) | tbl; \
+} while (0)
 #else
 #error "Unimplemented rdtsc"
 #endif