none/tests/s390x/laa.c

#include <stdint.h>
#include <stdio.h>
#include <string.h>

void 
test(int32_t op1_init, int32_t op2_init, int32_t op3_init, int expected_cc)
{
   register int32_t op1 asm("8") = op1_init;
   register int32_t op3 asm("9") = op3_init;
   
   int32_t op2 = op2_init;
   int cc = 1 - expected_cc; 

   printf("before op1 = %#x\n", op1);
   printf("before op2 = %#x\n", op2);
   printf("before op3 = %#x\n", op3);

   __asm__ volatile (
           ".insn rsy,0xEB00000000f8, 8,9,%1\n\t"
           "ipm     %0\n\t"
           "srl     %0,28\n\t"
           : "=d" (cc), "+Q" (op2), "+d"(op1), "+d"(op3)
           : 
           : "cc");

   printf("after  op1 = %#x\n", op1);
   printf("after  op2 = %#x\n", op2);
   printf("after  op3 = %#x\n", op3);
   printf("cc = %d\n", cc);

   if (cc != expected_cc) {
      printf("condition code is incorrect\n");
   }
   if (expected_cc == 0 && op2 != 0) {
      printf("cc = 0, but result != 0\n");
   } 
   if (expected_cc == 1 && op2 >= 0) {
      printf("cc = 1, but result >= 0\n");
   } 
   if (expected_cc == 2 && op2 <= 0) {
      printf("cc = 2, but result <= 0\n");
   } 
   /* the test for cc = 3 is left as an exercise for the reader. */
}

int main ()
{
   test(0, 0, 0, 0);
   test(-1, -1, -1, 1);
   test(0x10000000, 0x10000000, 0x12345678, 2);
   test(0x10000000, 0x20000000, 0x12345678, 2);

   test(-1, 3, -3, 0);
   test(0, -1, -1, 1);
   test(-1, 0x10000000, 0x12345678, 2);
   test(0x10000000, 0x7fffffff, 1, 3);

   return 0;
}