// SPDX-License-Identifier: GPL-2.0
#undef _GNU_SOURCE
#define _GNU_SOURCE 1
#undef __USE_GNU
#define __USE_GNU 1
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <fenv.h>
unsigned long long res64 = -1 ;
unsigned int res32 = -1 ;
unsigned short res16 = -1 ;
int test(void )
{
int ex;
feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
asm volatile ("\n"
" fld1" "\n"
" fisttps res16" "\n"
" fld1" "\n"
" fisttpl res32" "\n"
" fld1" "\n"
" fisttpll res64" "\n"
: : : "memory"
);
if (res16 != 1 || res32 != 1 || res64 != 1 ) {
printf("[BAD]\tfisttp 1\n" );
return 1 ;
}
ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
if (ex != 0 ) {
printf("[BAD]\tfisttp 1: wrong exception state\n" );
return 1 ;
}
feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
asm volatile ("\n"
" fldpi" "\n"
" fisttps res16" "\n"
" fldpi" "\n"
" fisttpl res32" "\n"
" fldpi" "\n"
" fisttpll res64" "\n"
: : : "memory"
);
if (res16 != 3 || res32 != 3 || res64 != 3 ) {
printf("[BAD]\tfisttp pi\n" );
return 1 ;
}
ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
if (ex != FE_INEXACT) {
printf("[BAD]\tfisttp pi: wrong exception state\n" );
return 1 ;
}
feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
asm volatile ("\n"
" fldpi" "\n"
" fchs" "\n"
" fisttps res16" "\n"
" fldpi" "\n"
" fchs" "\n"
" fisttpl res32" "\n"
" fldpi" "\n"
" fchs" "\n"
" fisttpll res64" "\n"
: : : "memory"
);
if (res16 != 0 xfffd || res32 != 0 xfffffffd || res64 != 0 xfffffffffffffffdULL) {
printf("[BAD]\tfisttp -pi\n" );
return 1 ;
}
ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
if (ex != FE_INEXACT) {
printf("[BAD]\tfisttp -pi: wrong exception state\n" );
return 1 ;
}
feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
asm volatile ("\n"
" fldln2" "\n"
" fisttps res16" "\n"
" fldln2" "\n"
" fisttpl res32" "\n"
" fldln2" "\n"
" fisttpll res64" "\n"
: : : "memory"
);
/* Test truncation to zero (round-to-nearest would give 1 here) */
if (res16 != 0 || res32 != 0 || res64 != 0 ) {
printf("[BAD]\tfisttp ln2\n" );
return 1 ;
}
ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
if (ex != FE_INEXACT) {
printf("[BAD]\tfisttp ln2: wrong exception state\n" );
return 1 ;
}
return 0 ;
}
void sighandler(int sig)
{
printf("[FAIL]\tGot signal %d, exiting\n" , sig);
exit (1 );
}
int main(int argc, char **argv, char **envp)
{
int err = 0 ;
/* SIGILL triggers on 32-bit kernels w/o fisttp emulation
* when run with "no387 nofxsr". Other signals are caught
* just in case.
*/
signal(SIGILL, sighandler);
signal(SIGFPE, sighandler);
signal(SIGSEGV, sighandler);
printf("[RUN]\tTesting fisttp instructions\n" );
err |= test();
if (!err)
printf("[OK]\tfisttp\n" );
else
printf("[FAIL]\tfisttp errors: %d\n" , err);
return err;
}
Messung V0.5 in Prozent C=94 H=92 G=92
¤ Dauer der Verarbeitung: 0.8 Sekunden
(vorverarbeitet am 2026-06-08)
¤
*© Formatika GbR, Deutschland