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diff --git a/kernel/cycle.h b/kernel/cycle.h
index a0e86f3..3ff4c0e 100644
--- a/kernel/cycle.h
+++ b/kernel/cycle.h
@@ -368,22 +368,6 @@ INLINE_ELAPSED(inline)
#define HAVE_TICK_COUNTER
#endif
-/*----------------------------------------------------------------*/
-/* S390, courtesy of James Treacy */
-#if defined(__GNUC__) && defined(__s390__) && !defined(HAVE_TICK_COUNTER)
-typedef unsigned long long ticks;
-
-static __inline__ ticks getticks(void)
-{
- ticks cycles;
- __asm__("stck 0(%0)" : : "a" (&(cycles)) : "memory", "cc");
- return cycles;
-}
-
-INLINE_ELAPSED(__inline__)
-
-#define HAVE_TICK_COUNTER
-#endif
/*----------------------------------------------------------------*/
#if defined(__GNUC__) && defined(__alpha__) && !defined(HAVE_TICK_COUNTER)
/*
@@ -436,26 +420,6 @@ INLINE_ELAPSED(__inline)
#define HAVE_TICK_COUNTER
#endif
-/*----------------------------------------------------------------*/
-/* SGI/Irix */
-#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_SGI_CYCLE) && !defined(HAVE_TICK_COUNTER)
-typedef struct timespec ticks;
-
-static inline ticks getticks(void)
-{
- struct timespec t;
- clock_gettime(CLOCK_SGI_CYCLE, &t);
- return t;
-}
-
-static inline double elapsed(ticks t1, ticks t0)
-{
- return ((double)t1.tv_sec - (double)t0.tv_sec) * 1.0E9 +
- ((double)t1.tv_nsec - (double)t0.tv_nsec);
-}
-#define HAVE_TICK_COUNTER
-#endif
-
/*----------------------------------------------------------------*/
/* Cray UNICOS _rtc() intrinsic function */
#if defined(HAVE__RTC) && !defined(HAVE_TICK_COUNTER)
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