From 5feadd8b6ab6470f1904dbf389f5dd4260064130 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Sun, 4 Sep 2011 13:46:16 +0000
Subject: [PATCH] core: fix PS3 compilation; the lol_fdiv implementation was
 missing.

---
 src/trig.cpp | 46 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/src/trig.cpp b/src/trig.cpp
index ac9ea31d..a2b7d958 100644
--- a/src/trig.cpp
+++ b/src/trig.cpp
@@ -95,13 +95,13 @@ static inline double lol_fctid(double x) INLINEATTR;
 static inline double lol_fctidz(double x) INLINEATTR;
 static inline double lol_fcfid(double x) INLINEATTR;
 static inline double lol_frsqrte(double x) INLINEATTR;
-#endif
 static inline double lol_fsel(double c, double gte, double lt) INLINEATTR;
+static inline double lol_fres(double x) INLINEATTR;
+static inline double lol_fdiv(double a, double b) INLINEATTR;
+#endif
 static inline double lol_fabs(double x) INLINEATTR;
 static inline double lol_round(double x) INLINEATTR;
 static inline double lol_trunc(double x) INLINEATTR;
-static inline double lol_round(double x) INLINEATTR;
-static inline double lol_trunc(double x) INLINEATTR;
 
 #if defined __CELLOS_LV2__
 static inline double lol_fctid(double x)
@@ -111,7 +111,7 @@ static inline double lol_fctid(double x)
     r = __builtin_fctid(x);
 #else
     __asm__ ("fctid %0, %1"
-             : "=f"(r) : "f"(x));
+             : "=f" (r) : "f" (x));
 #endif
     return r;
 }
@@ -123,7 +123,7 @@ static double lol_fctidz(double x)
     r = __builtin_fctidz(x);
 #else
     __asm__ ("fctidz %0, %1"
-             : "=f"(r) : "f"(x));
+             : "=f" (r) : "f" (x));
 #endif
     return r;
 }
@@ -135,7 +135,7 @@ static double lol_fcfid(double x)
     r = __builtin_fcfid(x);
 #else
     __asm__ ("fcfid %0, %1"
-             : "=f"(r) : "f"(x));
+             : "=f" (r) : "f" (x));
 #endif
     return r;
 }
@@ -147,11 +147,10 @@ static double lol_frsqrte(double x)
 #else
     double r;
     __asm__ ("frsqrte %0, %1"
-             : "=f"(r) : "f"(x));
+             : "=f" (r) : "f" (x));
     return r;
 #endif
 }
-#endif /* __CELLOS_LV2__ */
 
 static inline double lol_fsel(double c, double gte, double lt)
 {
@@ -160,13 +159,38 @@ static inline double lol_fsel(double c, double gte, double lt)
 #elif defined __CELLOS_LV2__
     double r;
     __asm__ ("fsel %0, %1, %2, %3"
-             : "=f"(r) : "f"(c), "f"(gte), "f"(lt));
+             : "=f" (r) : "f" (c), "f" (gte), "f" (lt));
     return r;
 #else
     return (c >= 0) ? gte : lt;
 #endif
 }
 
+static inline double lol_fres(double x)
+{
+    double ret;
+#if defined __SNC__
+    ret = __builtin_fre(x);
+#else
+    __asm__ ("fres %0, %1"
+             : "=f" (ret) : "f" (x));
+#endif
+    return ret;
+}
+
+static inline double lol_fdiv(double a, double b)
+{
+    /* Estimate */
+    double x0 = lol_fres(b);
+
+    /* Two steps of Newton-Raphson */
+    x0 = (b * x0 - ONE) * -x0 + x0;
+    x0 = (b * x0 - ONE) * -x0 + x0;
+
+    return a * x0;
+}
+#endif /* __CELLOS_LV2__ */
+
 static inline double lol_fabs(double x)
 {
 #if defined __CELLOS_LV2__ && defined __SNC__
@@ -174,7 +198,7 @@ static inline double lol_fabs(double x)
 #elif defined __CELLOS_LV2__
     double r;
     __asm__ ("fabs %0, %1"
-             : "=f"(r) : "f"(x));
+             : "=f" (r) : "f" (x));
     return r;
 #else
     return __builtin_fabs(x);
@@ -470,7 +494,7 @@ double lol_tan(double x)
 #if defined __CELLOS_LV2__
     double is_cos_not_zero = absc - VERY_SMALL_NUMBER;
     cosx = lol_fsel(is_cos_not_zero, cosx, VERY_SMALL_NUMBER);
-    return __fdiv(sinx, cosx);
+    return lol_fdiv(sinx, cosx);
 #else
     if (__unlikely(absc < VERY_SMALL_NUMBER))
         cosx = VERY_SMALL_NUMBER;