summaryrefslogtreecommitdiff
path: root/libquadmath/math/rintq.c
diff options
context:
space:
mode:
Diffstat (limited to 'libquadmath/math/rintq.c')
-rw-r--r--libquadmath/math/rintq.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/libquadmath/math/rintq.c b/libquadmath/math/rintq.c
new file mode 100644
index 000000000..fe7a59188
--- /dev/null
+++ b/libquadmath/math/rintq.c
@@ -0,0 +1,66 @@
+/* s_rintl.c -- long double version of s_rint.c.
+ * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
+ */
+
+/*
+ * ====================================================
+ * 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 "quadmath-imp.h"
+
+static const __float128
+TWO112[2]={
+ 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
+ -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
+};
+
+__float128
+rintq (__float128 x)
+{
+ int64_t i0,j0,sx;
+ uint64_t i,i1;
+ __float128 w,t;
+ GET_FLT128_WORDS64(i0,i1,x);
+ sx = (((uint64_t)i0)>>63);
+ j0 = ((i0>>48)&0x7fff)-0x3fff;
+ if(j0<48) {
+ if(j0<0) {
+ if(((i0&0x7fffffffffffffffLL)|i1)==0) return x;
+ i1 |= (i0&0x0000ffffffffffffLL);
+ i0 &= 0xffffe00000000000ULL;
+ i0 |= ((i1|-i1)>>16)&0x0000800000000000LL;
+ SET_FLT128_MSW64(x,i0);
+ w = TWO112[sx]+x;
+ t = w-TWO112[sx];
+ GET_FLT128_MSW64(i0,t);
+ SET_FLT128_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
+ return t;
+ } else {
+ i = (0x0000ffffffffffffLL)>>j0;
+ if(((i0&i)|i1)==0) return x; /* x is integral */
+ i>>=1;
+ if(((i0&i)|i1)!=0) {
+ if(j0==47) i1 = 0x4000000000000000ULL; else
+ i0 = (i0&(~i))|((0x0000200000000000LL)>>j0);
+ }
+ }
+ } else if (j0>111) {
+ if(j0==0x4000) return x+x; /* inf or NaN */
+ else return x; /* x is integral */
+ } else {
+ i = -1ULL>>(j0-48);
+ if((i1&i)==0) return x; /* x is integral */
+ i>>=1;
+ if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48));
+ }
+ SET_FLT128_WORDS64(x,i0,i1);
+ w = TWO112[sx]+x;
+ return w-TWO112[sx];
+}