source: libcfa/src/bits/defs.hfa @ 9cd5bd2

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// defs.hfa -- Commen macros, functions and typedefs
// Most files depend on them and they are always useful to have.
//
//  *** Must not contain code specific to libcfathread ***
//
// Author           : Thierry Delisle
// Created On       : Thu Nov  9 13:24:10 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Sat Oct 24 10:53:15 2020
// Update Count     : 21
//

#pragma once

#include <stdint.h>
#include <assert.h>

#define likely(x)   __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)

typedef void (*fptr_t)();
typedef int_fast16_t __lock_size_t;

#ifdef __cforall
#define __cfa_anonymous_object(x) inline struct x
#define __cfa_dlink(x) inline dlink(x)
#else
#define __cfa_anonymous_object(x) struct x __cfa_anonymous_object
#define __cfa_dlink(x) struct { struct x * next; struct x * back; } __dlink_substitute
#endif


#if defined(__has_attribute)
#if !__has_attribute(__noclone__)
#define ATTRIBUTE_NOCLONE
#endif
#endif
#ifndef ATTRIBUTE_NOCLONE
#define ATTRIBUTE_NOCLONE __attribute__((__noclone__))
#endif

#define libcfa_public __attribute__((visibility("default")))
#define libcfa_nopreempt __attribute__((section("cfatext_nopreempt"))) __attribute__((__noinline__)) ATTRIBUTE_NOCLONE

struct __cfa_nopreempt_region {
        void * start;
        void * stop;
};

#ifdef __cforall
void abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ ));
void abort( bool signalAbort, const char fmt[], ... ) __attribute__ (( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ ));
extern "C" {
#endif
void __cabi_abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ ));
#ifdef __cforall
}
#endif

#if defined(__cforall_thread__)
#define OPTIONAL_THREAD
#else
#define OPTIONAL_THREAD __attribute__((weak))
#endif

static inline long long int rdtscl(void) {
        #if defined( __i386 ) || defined( __x86_64 )
        unsigned int lo, hi;
        __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
        return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
        #elif defined( __aarch64__ ) || defined( __arm__ )
        // https://github.com/google/benchmark/blob/v1.1.0/src/cycleclock.h#L116
        long long int virtual_timer_value;
        asm volatile("mrs %0, cntvct_el0" : "=r"(virtual_timer_value));
        return virtual_timer_value;
        #else
                #error unsupported hardware architecture
        #endif
}

// pause to prevent excess processor bus usage
#if defined( __i386 ) || defined( __x86_64 )
        #define Pause() __asm__ __volatile__ ( "pause" : : : )
#elif defined( __ARM_ARCH )
        #define Pause() __asm__ __volatile__ ( "YIELD" : : : )
#else
        #error unsupported architecture
#endif

#define CFA_IO_LAZY (1_l64u << 32_l64u)