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

   1 /* Turn the truncate,zero_extend,lshiftrt sequence before the or into a
   2    zero_extract.  The truncate is due to TARGET_PROMOTE_PROTOTYPES, the
   3    zero_extend to PROMOTE_MODE.  As of GCC 6, we no longer define
   4    TARGET_PROMOTE_PROTOTYPES so that truncate is gone and we can
   5    generate either a single extract or a single shift instruction.  */
   6 /* { dg-do compile } */
   7 /* { dg-options "isa_rev>=2 -mgp64 -mlong64" } */
   8 /* { dg-skip-if "code quality test" { *-*-* } { "-O0" } { "" } } */
   9 /* { dg-final { scan-assembler-times "\tdext\t|\td?srl" 1 } } */
  10 /* { dg-final { scan-assembler-not "\tand" } } */
  11
  12 NOMIPS16 void
  13 f (unsigned char x, unsigned char *r)
  14 {
  15   *r = 0x50 | (x >> 4);
  16 }