about summary refs log tree commit diff
path: root/REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c
diff options
context:
space:
mode:
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c')
-rw-r--r--REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c b/REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c
new file mode 100644
index 0000000000..23f6a902b3
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/flt-32/s_modff.c
@@ -0,0 +1,54 @@
+/* s_modff.c -- float version of s_modf.c.
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+#include <math.h>
+#include <math_private.h>
+
+static const float one = 1.0;
+
+float
+__modff(float x, float *iptr)
+{
+	int32_t i0,j0;
+	u_int32_t i;
+	GET_FLOAT_WORD(i0,x);
+	j0 = ((i0>>23)&0xff)-0x7f;	/* exponent of x */
+	if(__builtin_expect(j0<23, 1)) {		/* integer part in x */
+	    if(j0<0) {			/* |x|<1 */
+		SET_FLOAT_WORD(*iptr,i0&0x80000000);	/* *iptr = +-0 */
+		return x;
+	    } else {
+		i = (0x007fffff)>>j0;
+		if((i0&i)==0) {			/* x is integral */
+		    u_int32_t ix;
+		    *iptr = x;
+		    GET_FLOAT_WORD(ix,x);
+		    SET_FLOAT_WORD(x,ix&0x80000000);	/* return +-0 */
+		    return x;
+		} else {
+		    SET_FLOAT_WORD(*iptr,i0&(~i));
+		    return x - *iptr;
+		}
+	    }
+	} else {			/* no fraction part */
+	    *iptr = x*one;
+	    /* We must handle NaNs separately.  */
+	    if (j0 == 0x80 && (i0 & 0x7fffff))
+	      return x*one;
+	    SET_FLOAT_WORD(x,i0&0x80000000);	/* return +-0 */
+	    return x;
+	}
+}
+weak_alias (__modff, modff)