none/tests/s390x/flogr.c

   1 #include <stdio.h>
   2 #include "opcodes.h"
   3
   4 /* The FLOGR insn reads from register R2 and writes to register R1 and
   5    R1 + 1. So we need to distinguish three cases:
   6
   7    (1) All three registers R1, R1 + 1, and R2 are distinct
   8    (2) R2 == R1
   9    (3) R2 == R1 + 1
  10
  11    These are tested by flogr1, flogr2, and flogr3, respectively. */
  12
  13 /* Call FLOGR on INPUT. The results are returned through the parms. */
  14
  15 /* R2 != R1 && R2 != R1 + 1 */
  16 void
  17 flogr1(unsigned long input, unsigned long *bitpos, unsigned long *modval,
  18        unsigned int *cc)
  19 {
  20    unsigned int psw;
  21    register unsigned long value asm("4") = input;
  22
  23    asm volatile ( FLOGR(2,4)
  24                   "ipm   %[psw]\n\t"
  25                   "stg   2, %[bitpos]\n\t"
  26                   "stg   3, %[modval]\n\t"
  27                   : [bitpos]"=T"(*bitpos), [modval]"=T"(*modval),
  28                     [psw]"=&d"(psw)
  29                   : [val] "d"(value)
  30                   : "2", "3", "cc");
  31
  32    *cc = psw >> 28;
  33 #if 0
  34    printf("value = %lx,  bitpos = %lu,  modval = %lx,  cc = %d\n",
  35           value, *bitpos, *modval, *cc);
  36 #endif
  37 }
  38
  39 /* R2 == R1 */
  40 void
  41 flogr2(unsigned long input, unsigned long *bitpos, unsigned long *modval,
  42        unsigned int *cc)
  43 {
  44    unsigned int psw;
  45    register unsigned long value asm("2") = input;
  46
  47    asm volatile ( FLOGR(2,2)
  48                   "ipm   %[psw]\n\t"
  49                   "stg   2, %[bitpos]\n\t"
  50                   "stg   3, %[modval]\n\t"
  51                   : [bitpos]"=T"(*bitpos), [modval]"=T"(*modval),
  52                     [psw]"=&d"(psw), [val] "+d"(value)
  53                   :
  54                   : "3", "cc");
  55
  56    *cc = psw >> 28;
  57 #if 0
  58    printf("value = %lx,  bitpos = %lu,  modval = %lx,  cc = %d\n",
  59           value, *bitpos, *modval, *cc);
  60 #endif
  61 }
  62
  63 /* R2 == R1 + 1 */
  64 void
  65 flogr3(unsigned long input, unsigned long *bitpos, unsigned long *modval,
  66        unsigned int *cc)
  67 {
  68    unsigned int psw;
  69    register unsigned long value asm("3") = input;
  70
  71    asm volatile ( FLOGR(2,3)
  72                   "ipm   %[psw]\n\t"
  73                   "stg   2, %[bitpos]\n\t"
  74                   "stg   3, %[modval]\n\t"
  75                   : [bitpos]"=T"(*bitpos), [modval]"=T"(*modval),
  76                     [psw]"=&d"(psw), [val] "+d"(value)
  77                   :
  78                   : "2", "cc");
  79
  80    *cc = psw >> 28;
  81 #if 0
  82    printf("value = %lx,  bitpos = %lu,  modval = %lx,  cc = %d\n",
  83           value, *bitpos, *modval, *cc);
  84 #endif
  85 }
  86
  87 void
  88 runtest(void (*func)(unsigned long, unsigned long *, unsigned long *,
  89                      unsigned int *))
  90 {
  91    unsigned long bitpos, modval, value;
  92    unsigned int cc;
  93    int i;
  94
  95    /* Value 0 is special */
  96    value = 0;
  97    func(value, &bitpos, &modval, &cc);
  98    if (modval != 0)  fprintf(stderr, "modval is wrong for %lx\n", value);
  99    if (bitpos != 64) fprintf(stderr, "bitpos is wrong for %lx\n", value);
 100    if (cc != 0)      fprintf(stderr, "cc is wrong for %lx\n", value);
 101
 102    /* Test with exactly 1 bit set */
 103    for (i = 0; i < 64; ++i) {
 104      value = 1ull << i;
 105      func(value, &bitpos, &modval, &cc);
 106      if (modval != 0) fprintf(stderr, "modval is wrong for %lx\n", value);
 107      if (bitpos != 63 - i) fprintf(stderr, "bitpos is wrong for %lx\n", value);
 108      if (cc != 2)          fprintf(stderr, "cc is wrong for %lx\n", value);
 109    }
 110
 111    /* Test with all bits 1 right from first 1 bit */
 112    for (i = 1; i < 64; ++i) {
 113      value = 1ull << i;
 114      value = value | (value - 1);
 115      func(value, &bitpos, &modval, &cc);
 116      if (modval != (value >> 1)) fprintf(stderr, "modval is wrong for %lx\n", value);
 117      if (bitpos != 63 - i) fprintf(stderr, "bitpos is wrong for %lx\n", value);
 118      if (cc != 2)          fprintf(stderr, "cc is wrong for %lx\n", value);
 119    }
 120 }
 121
 122
 123 int main()
 124 {
 125    runtest(flogr1);
 126    runtest(flogr2);
 127    runtest(flogr3);
 128
 129    return 0;
 130 }