src/cpu/ppc/vm/macroAssembler_ppc.cpp

rev 13389 : PPC: Implement MulAdd and SquareToLen intrinsics

This implementation is based on the algorithm implemented in java. It
yields a performance speedup of:
JDK8 - 23%
JDK9 - 5%
JDK10 - 5%

@@ -5226,10 +5226,44 @@
   mr_if_needed(carry, product);
 
   bind(L_post_third_loop_done);
 }   // multiply_128_x_128_loop
 
+void MacroAssembler::muladd(Register out, Register in,
+                            Register offset, Register len, Register k,
+                            Register tmp1, Register tmp2, Register carry) {
+
+    // Labels
+    Label LOOP, SKIP;
+
+    // Make sure length is positive.
+    cmpdi  (CCR0,    len,     0);
+
+    // Prepare variables
+    subi   (offset,  offset,  4);
+    li     (carry,   0);
+    ble    (CCR0,    SKIP);
+
+    mtctr  (len);
+    subi   (len,     len,     1    );
+    sldi   (len,     len,     2    );
+
+    // Main loop
+    bind(LOOP);
+    lwzx   (tmp1,    len,     in   );
+    lwzx   (tmp2,    offset,  out  );
+    mulld  (tmp1,    tmp1,    k    );
+    add    (tmp2,    carry,   tmp2 );
+    add    (tmp2,    tmp1,    tmp2 );
+    stwx   (tmp2,    offset,  out  );
+    srdi   (carry,   tmp2,    32   );
+    subi   (offset,  offset,  4    );
+    subi   (len,     len,     4    );
+    bdnz   (LOOP);
+    bind(SKIP);
+}
+
 void MacroAssembler::multiply_to_len(Register x, Register xlen,
                                      Register y, Register ylen,
                                      Register z, Register zlen,
                                      Register tmp1, Register tmp2,
                                      Register tmp3, Register tmp4,