xtensa: Make use of DEPBITS instructionHEADtrunkmaster

This patch implements bitfield insertion MD pattern using the DEPBITS
machine instruction, the counterpart of the EXTUI instruction, if
available.

     /* example */
     struct foo {
       unsigned int b:10;
       unsigned int r:11;
       unsigned int g:11;
     };
     void test(struct foo *p) {
       p->g >>= 1;
     }

     ;; result (endianness: little)
     test:
     	entry	sp, 32
     	l32i.n	a8, a2, 0
     	extui	a9, a8, 1, 10
     	depbits	a8, a9, 0, 11
     	s32i.n	a8, a2, 0
     	retw.n

gcc/ChangeLog:

	* config/xtensa/xtensa.h (TARGET_DEPBITS): New macro.
	* config/xtensa/xtensa.md (insvsi): New insn pattern.

0 files changed, 0 insertions, 0 deletions