gcc/testsuite/gcc.target/i386/pr21291.c

   1 /* The asm has 2 "r" in/out operands, 1 earlyclobber "r" output, 1 "r"
   2    input and 2 fixed "r" clobbers (eax and edx), so there are a total of
   3    6 registers that must not conflict.  Add to that the PIC register,
   4    the frame pointer, and the stack pointer, and we've run out of
   5    registers on 32-bit targets.  */
   6 /* { dg-do compile } */
   7 /* { dg-options "-O" } */
   8
   9 typedef unsigned long bngdigit;
  10 typedef bngdigit *bng;
  11 typedef unsigned int bngcarry;
  12 typedef unsigned long bngsize;
  13
  14 bngdigit
  15 bng_ia32_mult_sub_digit (bng a, bngsize alen, bng b, bngsize blen, bngdigit d)
  16 {
  17   bngdigit out, tmp;
  18   bngcarry carry;
  19   bngdigit a11;
  20
  21   alen -= blen;
  22   out = 0;
  23   asm (""
  24        : "+r" (a), "+r" (b), "+mr" (blen), "+mr" (out), "=&r" (tmp)
  25        : "mr" (d)
  26        : "eax", "edx");
  27   if (alen == 0)
  28     {
  29       a11 = out;
  30       goto t;
  31     }
  32
  33   a11 = 1;
  34  t:
  35   return a11;
  36 }