gcc/testsuite/gcc.target/mips/dse-1.c

/* { dg-do compile } */
/* { dg-options "-mgp64" } */
/* { dg-skip-if "code quality test" { *-*-* } { "-O0" } { "" } } */

#define TEST(ID, TYPE1, TYPE2)					\
  union u##ID {							\
    TYPE1 m1[sizeof (TYPE2) / sizeof (TYPE1)];			\
    TYPE2 m2;							\
  };								\
								\
  /* The MIPS16 versions of the shifts we need are too		\
     expensive.  */						\
  TYPE1 __attribute__((nomips16))				\
  f##ID (TYPE2 x, union u##ID *u)				\
  {								\
    u->m2 = x;							\
    return (u->m1[0]						\
	    + u->m1[sizeof (TYPE2) / sizeof (TYPE1) - 1]);	\
  }								\
								\
  TYPE1 __attribute__((nomips16))				\
  g##ID (union u##ID *u)					\
  {								\
    u->m2 = 0;							\
    return (u->m1[0] | u->m1[1]);				\
  }

TEST (1, unsigned int, unsigned long long);
TEST (2, int, long long);
TEST (3, unsigned short, unsigned long long);
TEST (4, short, long long);
TEST (5, unsigned char, unsigned long long);
TEST (6, signed char, long long);

TEST (7, unsigned short, unsigned int);
TEST (8, short, int);
TEST (9, unsigned char, unsigned int);
TEST (10, signed char, int);

TEST (11, unsigned char, unsigned short);
TEST (12, signed char, short);

/* { dg-final { scan-assembler-not "\tlh\t" } } */
/* { dg-final { scan-assembler-not "\tlhu\t" } } */
/* { dg-final { scan-assembler-not "\tlw\t" } } */
/* { dg-final { scan-assembler-not "\tlwu\t" } } */
/* { dg-final { scan-assembler-not "\tlb\t" } } */
/* { dg-final { scan-assembler-not "\tlbu\t" } } */