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/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
* Copyright (c) 2004-2006 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2006 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2006 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include "opal/constants.h"
#include "opal/util/arch.h"
uint32_t opal_local_arch = 0xFFFFFFFF;
static inline int32_t opal_arch_isbigendian ( void )
{
const uint32_t value = 0x12345678;
const char *ptr = (char*)&value;
int x = 0;
/* if( sizeof(int) == 8 ) x = 4; */
if( ptr[x] == 0x12) return 1; /* big endian, true */
if( ptr[x] == 0x78 ) return 0; /* little endian, false */
assert( 0 ); /* unknown architecture not little nor big endian */
return -1;
}
/* we must find which representation of long double is used
* intel or sparc. Both of them represent the long doubles using a close to
* IEEE representation (seeeeeee..emmm...m) where the mantissa look like
* 1.????. For the intel representaion the 1 is explicit, and for the sparc
* the first one is implicit. If we take the number 2.0 the exponent is 1
* and the mantissa is 1.0 (the sign of course should be 0). So if we check
* for the first one in the binary representation of the number, we will
* find the bit from the exponent, so the next one should be the begining
* of the mantissa. If it's 1 then we have an intel representaion, if not
* we have a sparc one. QED
*/
static inline int32_t opal_arch_ldisintel( void )
{
long double ld = 2.0;
int i, j;
uint32_t* pui = (uint32_t*)(void*)&ld;
j = LDBL_MANT_DIG / 32;
i = (LDBL_MANT_DIG % 32) - 1;
if( opal_arch_isbigendian() ) { /* big endian */
j = (sizeof(long double) / sizeof(unsigned int)) - j;
if( i < 0 ) {
i = 31;
j = j+1;
}
} else {
if( i < 0 ) {
i = 31;
j = j-1;
}
}
return (pui[j] & (1 << i) ? 1 : 0);
}
static inline void opal_arch_setmask ( uint32_t *var, uint32_t mask)
{
*var |= mask;
}
int opal_arch_init(void)
{
opal_local_arch = (OPAL_ARCH_HEADERMASK | OPAL_ARCH_UNUSEDMASK);
/* Handle the size of long (can hold a pointer) */
if( 8 == sizeof(long) )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LONGIS64 );
/* sizeof bool */
if (1 == sizeof(bool) ) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_BOOLIS8);
} else if (2 == sizeof(bool)) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_BOOLIS16);
} else if (4 == sizeof(bool)) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_BOOLIS32);
}
/* Note that fortran logical size is set later, to make
abstractions a little less painful... */
/* Initialize the information regarding the long double */
if( 12 == sizeof(long double) )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LONGDOUBLEIS96 );
else if( 16 == sizeof(long double) )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LONGDOUBLEIS128 );
/* Big endian or little endian ? That's the question */
if( opal_arch_isbigendian() )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_ISBIGENDIAN );
/* What's the maximum exponent ? */
if ( LDBL_MAX_EXP == 16384 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDEXPSIZEIS15 );
/* How about the length in bits of the mantissa */
if ( LDBL_MANT_DIG == 64 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDMANTDIGIS64 );
else if ( LDBL_MANT_DIG == 105 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDMANTDIGIS105 );
else if ( LDBL_MANT_DIG == 106 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDMANTDIGIS106 );
else if ( LDBL_MANT_DIG == 107 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDMANTDIGIS107 );
else if ( LDBL_MANT_DIG == 113 )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDMANTDIGIS113 );
/* Intel data representation or Sparc ? */
if( opal_arch_ldisintel() )
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LDISINTEL );
return OPAL_SUCCESS;
}
int32_t opal_arch_checkmask ( uint32_t *var, uint32_t mask )
{
unsigned int tmpvar = *var;
/* Check whether the headers are set correctly,
or whether this is an erroneous integer */
if( !((*var) & OPAL_ARCH_HEADERMASK) ) {
if( (*var) & OPAL_ARCH_HEADERMASK2 ) {
char* pcDest, *pcSrc;
/* Both ends of this integer have the wrong settings,
maybe its just the wrong endian-representation. Try
to swap it and check again. If it looks now correct,
keep this version of the variable
*/
pcDest = (char *) &tmpvar;
pcSrc = (char *) var + 3;
*pcDest++ = *pcSrc--;
*pcDest++ = *pcSrc--;
*pcDest++ = *pcSrc--;
*pcDest++ = *pcSrc--;
if( (tmpvar & OPAL_ARCH_HEADERMASK) && (!(tmpvar & OPAL_ARCH_HEADERMASK2)) ) {
*var = tmpvar;
} else
return -1;
} else
return -1;
}
/* Here is the real evaluation of the bitmask */
return ( ((*var) & mask) == mask );
}
int
opal_arch_set_fortran_logical_size(uint32_t size)
{
if (1 == size) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LOGICALIS8);
} else if (2 == size) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LOGICALIS16);
} else if (4 == size) {
opal_arch_setmask( &opal_local_arch, OPAL_ARCH_LOGICALIS32);
}
return OPAL_SUCCESS;
}
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