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runtime: Use stckf unconditionally on s390.

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2014-11-05  Dominik Vogt  <vogt@linux.vnet.ibm.com>

* libgo/runtime/runtime.c (runtime_cputicks): s390: use stckf
unconditionally

From-SVN: r217195
This commit is contained in:
Dominik Vogt 2014-11-06 17:00:13 +00:00 • committed by Ian Lance Taylor
parent 5c2648fb01
commit 4ad4ebfeae
1 changed files with 6 additions and 6 deletions
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12
libgo/runtime/runtime.c
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@ -195,12 +195,12 @@ runtime_cputicks(void)
asm("rdtsc" : "=a" (low), "=d" (high));
return (int64)(((uint64)high << 32) | (uint64)low);
#elif defined (__s390__) || defined (__s390x__)
uint64 clock;
#ifdef S390_HAVE_STCKF
asm("stckf\t%0" : "=Q" (clock) : : );
#else
clock = 0;
#endif
uint64 clock = 0;
/* stckf may not write the return variable in case of a clock error, so make
it read-write to prevent that the initialisation is optimised out.
Note: Targets below z9-109 will crash when executing store clock fast, i.e.
we don't support Go for machines older than that. */
asm volatile(".insn s,0xb27c0000,%0" /* stckf */ : "+Q" (clock) : : "cc" );
return (int64)clock;
#else
// FIXME: implement for other processors.