timer.h
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	#pragma once
	//
	#include <sys/time.h>
	extern "C"{
	double myseconds()
	{
	struct timeval tp;
	struct timezone tzp;
	//
	int i = gettimeofday(&tp,&tzp);
	//
	return ( (double) tp.tv_sec + (double) tp.tv_usec * 1.e-6 );
	}
	}

	#ifndef __xlC__
	static inline unsigned long long cycles()
	{
	unsigned long long u;
	__asm__ volatile ("rdtscp;shlq $32,%%rdx;orq %%rdx,%%rax;movq %%rax,%0":"=q"(u)::"%rax", "%rdx", "rcx");
	return u;
	}
	#endif