selftests/x86/test_FCMOV.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #undef _GNU_SOURCE
0003 #define _GNU_SOURCE 1
0004 #undef __USE_GNU
0005 #define __USE_GNU 1
0006 #include <unistd.h>
0007 #include <stdlib.h>
0008 #include <string.h>
0009 #include <stdio.h>
0010 #include <signal.h>
0011 #include <sys/types.h>
0012 #include <sys/select.h>
0013 #include <sys/time.h>
0014 #include <sys/wait.h>
0015
0016 #define TEST(insn) \
0017 long double __attribute__((noinline)) insn(long flags) \
0018 {                       \
0019     long double out;            \
0020     asm ("\n"               \
0021     "   push    %1""\n"         \
0022     "   popf""\n"           \
0023     "   fldpi""\n"          \
0024     "   fld1""\n"           \
0025     "   " #insn " %%st(1), %%st" "\n"   \
0026     "   ffree   %%st(1)" "\n"       \
0027     : "=t" (out)                \
0028     : "r" (flags)               \
0029     );                  \
0030     return out;             \
0031 }
0032
0033 TEST(fcmovb)
0034 TEST(fcmove)
0035 TEST(fcmovbe)
0036 TEST(fcmovu)
0037 TEST(fcmovnb)
0038 TEST(fcmovne)
0039 TEST(fcmovnbe)
0040 TEST(fcmovnu)
0041
0042 enum {
0043     CF = 1 << 0,
0044     PF = 1 << 2,
0045     ZF = 1 << 6,
0046 };
0047
0048 void sighandler(int sig)
0049 {
0050     printf("[FAIL]\tGot signal %d, exiting\n", sig);
0051     exit(1);
0052 }
0053
0054 int main(int argc, char **argv, char **envp)
0055 {
0056     int err = 0;
0057
0058     /* SIGILL triggers on 32-bit kernels w/o fcomi emulation
0059      * when run with "no387 nofxsr". Other signals are caught
0060      * just in case.
0061      */
0062     signal(SIGILL, sighandler);
0063     signal(SIGFPE, sighandler);
0064     signal(SIGSEGV, sighandler);
0065
0066     printf("[RUN]\tTesting fcmovCC instructions\n");
0067     /* If fcmovCC() returns 1.0, the move wasn't done */
0068     err |= !(fcmovb(0)   == 1.0); err |= !(fcmovnb(0)  != 1.0);
0069     err |= !(fcmove(0)   == 1.0); err |= !(fcmovne(0)  != 1.0);
0070     err |= !(fcmovbe(0)  == 1.0); err |= !(fcmovnbe(0) != 1.0);
0071     err |= !(fcmovu(0)   == 1.0); err |= !(fcmovnu(0)  != 1.0);
0072
0073     err |= !(fcmovb(CF)  != 1.0); err |= !(fcmovnb(CF)  == 1.0);
0074     err |= !(fcmove(CF)  == 1.0); err |= !(fcmovne(CF)  != 1.0);
0075     err |= !(fcmovbe(CF) != 1.0); err |= !(fcmovnbe(CF) == 1.0);
0076     err |= !(fcmovu(CF)  == 1.0); err |= !(fcmovnu(CF)  != 1.0);
0077
0078     err |= !(fcmovb(ZF)  == 1.0); err |= !(fcmovnb(ZF)  != 1.0);
0079     err |= !(fcmove(ZF)  != 1.0); err |= !(fcmovne(ZF)  == 1.0);
0080     err |= !(fcmovbe(ZF) != 1.0); err |= !(fcmovnbe(ZF) == 1.0);
0081     err |= !(fcmovu(ZF)  == 1.0); err |= !(fcmovnu(ZF)  != 1.0);
0082
0083     err |= !(fcmovb(PF)  == 1.0); err |= !(fcmovnb(PF)  != 1.0);
0084     err |= !(fcmove(PF)  == 1.0); err |= !(fcmovne(PF)  != 1.0);
0085     err |= !(fcmovbe(PF) == 1.0); err |= !(fcmovnbe(PF) != 1.0);
0086     err |= !(fcmovu(PF)  != 1.0); err |= !(fcmovnu(PF)  == 1.0);
0087
0088         if (!err)
0089                 printf("[OK]\tfcmovCC\n");
0090     else
0091         printf("[FAIL]\tfcmovCC errors: %d\n", err);
0092
0093     return err;
0094 }