sparc: Simplify emit_be_Perm() a bit.

ir/be/sparc/sparc_emitter.c

@@ -862,13 +862,9 @@ static void emit_be_Perm(const ir_node *irn)
 {
 	arch_register_req_t const *const req = arch_get_irn_register_req_out(irn, 0);
 	if (req->cls == &sparc_reg_classes[CLASS_sparc_fp]) {
-		arch_register_t const *const reg0 = arch_get_irn_register_out(irn, 0);
-		arch_register_t const *const reg1 = arch_get_irn_register_out(irn, 1);
-		unsigned reg_idx0 = reg0->global_index;
-		unsigned reg_idx1 = reg1->global_index;
-		for (unsigned i = 0, width = req->width; i < width; ++i) {
-			const arch_register_t *r0 = &sparc_registers[reg_idx0+i];
-			const arch_register_t *r1 = &sparc_registers[reg_idx1+i];
+		arch_register_t const *r0 = arch_get_irn_register_out(irn, 0);
+		arch_register_t const *r1 = arch_get_irn_register_out(irn, 1);
+		for (unsigned i = 0, width = req->width; i < width; ++r0, ++r1, ++i) {
 			sparc_emitf(irn, "fmovs %R, %%f31", r0);
 			sparc_emitf(irn, "fmovs %R, %R", r1, r0);
 			sparc_emitf(irn, "fmovs %%f31, %R", r1);