xref: /openbmc/qemu/tests/tcg/s390x/cgebra.c (revision 8d6b2f94)
1 /*
2  * Test the CGEBRA instruction.
3  *
4  * SPDX-License-Identifier: GPL-2.0-or-later
5  */
6 #include <assert.h>
7 #include <fenv.h>
8 #include <stdlib.h>
9 
10 int main(void)
11 {
12     float r2 = 1E+300;
13     long long r1;
14     int cc;
15 
16     feclearexcept(FE_ALL_EXCEPT);
17     asm("cgebra %[r1],%[m3],%[r2],%[m4]\n"
18         "ipm %[cc]\n"
19         : [r1] "=r" (r1)
20         , [cc] "=r" (cc)
21         : [m3] "i" (5) /* round toward 0 */
22         , [r2] "f" (r2)
23         , [m4] "i" (8) /* bit 0 is set, but must be ignored; XxC is not set */
24         : "cc");
25     cc >>= 28;
26 
27     assert(r1 == 0x7fffffffffffffffLL);
28     assert(cc == 3);
29     assert(fetestexcept(FE_ALL_EXCEPT) == (FE_INVALID | FE_INEXACT));
30 
31     return EXIT_SUCCESS;
32 }
33