Initial commit

1 files changed, 68 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/libm/s_modf.c b/contrib/SDL-3.2.8/src/libm/s_modf.c
new file mode 100644
index 0000000..55f83ba
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/libm/s_modf.c
@@ -0,0 +1,68 @@
+#include "SDL_internal.h"
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * modf(double x, double *iptr)
+ * return fraction part of x, and return x's integral part in *iptr.
+ * Method:
+ *      Bit twiddling.
+ *
+ * Exception:
+ *      No exception.
+ */
+
+#include "math_libm.h"
+#include "math_private.h"
+
+static const double one = 1.0;
+
+double modf(double x, double *iptr)
+{
+        int32_t i0,i1,_j0;
+        u_int32_t i;
+        EXTRACT_WORDS(i0,i1,x);
+        _j0 = ((i0>>20)&0x7ff)-0x3ff;   /* exponent of x */
+        if(_j0<20) {                    /* integer part in high x */
+            if(_j0<0) {                 /* |x|<1 */
+                INSERT_WORDS(*iptr,i0&0x80000000,0);    /* *iptr = +-0 */
+                return x;
+            } else {
+                i = (0x000fffff)>>_j0;
+                if(((i0&i)|i1)==0) {            /* x is integral */
+                    *iptr = x;
+                    INSERT_WORDS(x,i0&0x80000000,0);    /* return +-0 */
+                    return x;
+                } else {
+                    INSERT_WORDS(*iptr,i0&(~i),0);
+                    return x - *iptr;
+                }
+            }
+        } else if (_j0>51) {            /* no fraction part */
+            *iptr = x*one;
+            /* We must handle NaNs separately.  */
+            if (_j0 == 0x400 && ((i0 & 0xfffff) | i1))
+              return x*one;
+            INSERT_WORDS(x,i0&0x80000000,0);    /* return +-0 */
+            return x;
+        } else {                        /* fraction part in low x */
+            i = ((u_int32_t)(0xffffffff))>>(_j0-20);
+            if((i1&i)==0) {             /* x is integral */
+                *iptr = x;
+                INSERT_WORDS(x,i0&0x80000000,0);        /* return +-0 */
+                return x;
+            } else {
+                INSERT_WORDS(*iptr,i0,i1&(~i));
+                return x - *iptr;
+            }
+        }
+}
+libm_hidden_def(modf)