xtensa: Optimize integer constant addition that is between -32896 and 32639

Such constants are often subject to the constant synthesis:

    int test(int a) {
      return a - 31999;
    }

    test:
	movi	a3, 1
	addmi	a3, a3, -0x7d00
	add	a2, a2, a3
	ret

This patch optimizes such case as follows:

    test:
	addi	a2, a2, 1
	addmi	a2, a2, -0x7d00
	ret

gcc/ChangeLog:

	* config/xtensa/xtensa.md:
	Suppress unnecessary emitting nop insn in the split patterns for
	integer/FP constant synthesis, and add new peephole2 pattern that
	folds such synthesized additions.

0 files changed, 0 insertions, 0 deletions