none/tests/x86/incdec_alt.c

   1
   2 /* A test of the alternative (redundant) encodings for {inc,dec}{w,l}. */
   3
   4 #include "tests/asm.h"
   5 #include <stdio.h>
   6
   7 int r1,r2,r3,r4,r5,r6,r7,r8,a1,a2;
   8
   9 extern void foo ( void );
  10 asm("\n"
  11 ".text\n"
  12 VG_SYM(foo) ":\n"
  13 "\tpushl $0\n"
  14 "\tpopfl\n"
  15 "\tmovl " VG_SYM(a1) ",%eax\n"
  16 "\tmovl " VG_SYM(a2) ",%edx\n"
  17
  18 /* inc %eax */
  19 "\t.byte 0xFF\n"
  20 "\t.byte 0xC0\n"
  21
  22 "\tmovl %eax," VG_SYM(r1) "\n"
  23 "\tpushfl\n"
  24 "\tpopl " VG_SYM(r2) "\n"
  25
  26 /* inc %dx */
  27 "\t.byte 0x66\n"
  28 "\t.byte 0xFF\n"
  29 "\t.byte 0xC2\n"
  30
  31 "\tmovl %edx," VG_SYM(r3) "\n"
  32 "\tpushfl\n"
  33 "\tpopl " VG_SYM(r4) "\n"
  34
  35 /* dec %edx */
  36 "\t.byte 0xFF\n"
  37 "\t.byte 0xCA\n"
  38
  39 "\tmovl %edx," VG_SYM(r5) "\n"
  40 "\tpushfl\n"
  41 "\tpopl " VG_SYM(r6) "\n"
  42
  43 /* dec %ax */
  44 "\t.byte 0x66\n"
  45 "\t.byte 0xFF\n"
  46 "\t.byte 0xC8\n"
  47
  48 "\tmovl %eax," VG_SYM(r7) "\n"
  49 "\tpushfl\n"
  50 "\tpopl " VG_SYM(r8) "\n"
  51
  52 "\tret\n"
  53 ".previous\n"
  54 );
  55
  56 int main ( void )
  57 {
  58   a1 = 0x77777777;
  59   a2 = 0x88888888;
  60   r1=r2=r3=r4=r5=r6=r7=r8=0;
  61   foo();
  62   printf("0x%08x\n",r1);
  63   printf("0x%08x\n",r2);
  64   printf("0x%08x\n",r3);
  65   printf("0x%08x\n",r4);
  66   printf("0x%08x\n",r5);
  67   printf("0x%08x\n",r6);
  68   printf("0x%08x\n",r7);
  69   printf("0x%08x\n",r8);
  70   return 0;
  71 }