From bf7c98f586ca301e6e2de0aa4d01b66ca0eba761 Mon Sep 17 00:00:00 2001
From: unknown <rj150@hotmail.com>
Date: Mon, 8 Jun 2015 16:28:21 -0400
Subject: [PATCH] Conker's BFD micro-optimization with 2's cmpl. integer
 division

---
 vu/divide.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/vu/divide.c b/vu/divide.c
index 81d7cbb..bb5e878 100644
--- a/vu/divide.c
+++ b/vu/divide.c
@@ -1070,10 +1070,17 @@ INLINE static void do_div(i32 data, int sqrt, int precision)
     int fetch;
     int shift;
 
+#if (~0 >> 1 == -1)
+    data ^= (s32)(data + 32768) >> 31; /* DP only:  (data < -32768) */
+    fetch = (s32)(data +     0) >> 31;
+    data ^= fetch;
+    data -= fetch; /* two's complement:  -x == ~x - (~0) on wrap-around */
+#else
     if (precision == SP_DIV_PRECISION_SINGLE)
         data = (data < 0) ? -data : +data;
     if (precision == SP_DIV_PRECISION_DOUBLE && data < 0)
         data = (data >= -32768) ? -data : ~data;
+#endif
 
 /*
  * Note, from the code just above, that data cannot be negative.