qemu/tests/tcg/s390x/cgebra.c

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/*
* Test the CGEBRA instruction.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <assert.h>
#include <fenv.h>
#include <stdlib.h>
int main(void)
{
float r2 = 1E+300;
long long r1;
int cc;
feclearexcept(FE_ALL_EXCEPT);
asm("cgebra %[r1],%[m3],%[r2],%[m4]\n"
"ipm %[cc]\n"
: [r1] "=r" (r1)
, [cc] "=r" (cc)
: [m3] "i" (5) /* round toward 0 */
, [r2] "f" (r2)
, [m4] "i" (8) /* bit 0 is set, but must be ignored; XxC is not set */
: "cc");
cc >>= 28;
assert(r1 == 0x7fffffffffffffffLL);
assert(cc == 3);
assert(fetestexcept(FE_ALL_EXCEPT) == (FE_INVALID | FE_INEXACT));
return EXIT_SUCCESS;
}