sdcc/support/regression/tests/bug-2708.c

   1 /* bug-2708.c
   2    The STM8 peephole optimizer didn't like indirect addressing modes in inline asm.
   3  */
   4
   5 #include <testfwk.h>
   6 #include <stdint.h>
   7
   8 #ifdef __SDCC
   9 #pragma std_c99
  10 #endif
  11
  12 uint8_t *cp;
  13
  14 void f1(void)
  15 {
  16         *cp >>= 1;
  17 }
  18
  19 #ifdef __SDCC_stm8
  20
  21 void f2(void)
  22 {
  23
  24 __asm
  25         srl     [_cp]
  26 __endasm;
  27 }
  28
  29 void f3(void)
  30 {
  31 __asm
  32         ldw     y, _cp
  33         srl     (y)
  34 __endasm;
  35 }
  36
  37 void f4(void)
  38 {
  39 __asm
  40         ld      a, [_cp]
  41         srl     a
  42         ld      [_cp], a
  43 __endasm;
  44 }
  45
  46 void f5(void)
  47 {
  48 __asm
  49         clrw    x
  50         srl     ([_cp], x)
  51 __endasm;
  52 }
  53
  54 #else
  55
  56 #define f2 f1
  57 #define f3 f1
  58 #define f4 f1
  59 #define f5 f1
  60
  61 #endif
  62
  63
  64 void testBug(void)
  65 {
  66         uint8_t c;
  67         cp = &c;
  68
  69         c = 0xaa;
  70         f1();
  71         ASSERT(c == 0x55);
  72
  73         c = 0xaa;
  74         f2();
  75         ASSERT(c == 0x55);
  76
  77         c = 0xaa;
  78         f3();
  79         ASSERT(c == 0x55);
  80
  81         c = 0xaa;
  82         f4();
  83         ASSERT(c == 0x55);
  84
  85         c = 0xaa;
  86         f5();
  87         ASSERT(c == 0x55);
  88 }
  89