upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/math/s_fma.c

@@ -0,0 +1,56 @@
+/*
+FUNCTION
+<<fma>>, <<fmaf>>--floating multiply add
+INDEX
+	fma
+INDEX
+	fmaf
+
+ANSI_SYNOPSIS
+	#include <math.h>
+	double fma(double <[x]>, double <[y]>, double <[z]>);
+	float fmaf(float <[x]>, float <[y]>, float <[z]>);
+
+DESCRIPTION
+The <<fma>> functions compute (<[x]> * <[y]>) + <[z]>, rounded as one ternary
+operation:  they compute the value (as if) to infinite precision and round once
+to the result format, according to the rounding mode characterized by the value
+of FLT_ROUNDS.  That is, they are supposed to do this:  see below.
+
+RETURNS
+The <<fma>> functions return (<[x]> * <[y]>) + <[z]>, rounded as one ternary
+operation.
+
+BUGS
+This implementation does not provide the function that it should, purely
+returning "(<[x]> * <[y]>) + <[z]>;" with no attempt at all to provide the
+simulated infinite precision intermediates which are required.  DO NOT USE THEM.
+
+If double has enough more precision than float, then <<fmaf>> should provide
+the expected numeric results, as it does use double for the calculation.  But
+since this is not the case for all platforms, this manual cannot determine
+if it is so for your case.
+
+PORTABILITY
+ANSI C, POSIX.
+
+*/
+
+#include "fdlibm.h"
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double fma(double x, double y, double z)
+#else
+	double fma(x,y)
+	double x;
+	double y;
+        double z;
+#endif
+{
+  /* Implementation defined. */
+  return (x * y) + z;
+}
+
+#endif /* _DOUBLE_IS_32BITS */