gcc/testsuite/gcc.target/mips/ins-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-meb isa_rev>=2 -mgp64" } */
   3 /* { dg-skip-if "code quality test" { *-*-* } { "-O0" } { "" } } */
   4 /* { dg-final { scan-assembler-times "\tins\t|\tdins\t" 1 } } */
   5 /* { dg-final { scan-assembler-times "\tsll\t|\tins\t" 1 } } */
   6
   7 /* When inserting something into the top bit of a 32-bit structure,
   8    we must make sure that the register remains properly sign-extended.
   9    There are two ways of doing this:
  10
  11      - use purely 32-bit bit manipulations (a single INS, matched twice here).
  12      - use a 64-bit bit manipulation (DINS), and sign-extend the result.  We
  13      check for this extension using SLL.  */
  14
  15 struct s
  16 {
  17   int a:3;
  18   int b:29;
  19 };
  20
  21 NOMIPS16 void
  22 f (int a)
  23 {
  24   struct s s;
  25   asm volatile ("" : "=r"(s));
  26   s.a = a;
  27   asm volatile ("" :: "r"(s));
  28 }