diff options
Diffstat (limited to 'usr/src/lib/libm/common/m9x/llroundl.c')
| -rw-r--r-- | usr/src/lib/libm/common/m9x/llroundl.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/llroundl.c b/usr/src/lib/libm/common/m9x/llroundl.c new file mode 100644 index 0000000000..a8f5984ab8 --- /dev/null +++ b/usr/src/lib/libm/common/m9x/llroundl.c @@ -0,0 +1,166 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +/* + * Copyright 2011 Nexenta Systems, Inc. All rights reserved. + */ +/* + * Copyright 2006 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#if defined(ELFOBJ) +#pragma weak llroundl = __llroundl +#if defined(__sparcv9) || defined(__amd64) +#pragma weak lroundl = __llroundl +#pragma weak __lroundl = __llroundl +#endif +#endif + +#include "libm.h" + +#if defined(__sparc) +long long +llroundl(long double x) { + union { + unsigned i[4]; + long double q; + } xx; + union { + unsigned i[2]; + long long l; + } zz; + union { + unsigned i; + float f; + } tt; + unsigned hx, sx, frac; + int j; + + xx.q = x; + sx = xx.i[0] & 0x80000000; + hx = xx.i[0] & ~0x80000000; + + /* handle trivial cases */ + if (hx > 0x403e0000) { /* |x| > 2^63 + ... or x is nan */ + /* convert an out-of-range float */ + tt.i = sx | 0x7f000000; + return ((long long) tt.f); + } + + /* handle |x| < 1 */ + if (hx < 0x3fff0000) { + if (hx >= 0x3ffe0000) + return (sx ? -1LL : 1LL); + return (0LL); + } + + /* extract the integer and fractional parts of x */ + j = 0x406f - (hx >> 16); + xx.i[0] = 0x10000 | (xx.i[0] & 0xffff); + if (j >= 96) { + zz.i[0] = 0; + zz.i[1] = xx.i[0] >> (j - 96); + frac = ((xx.i[0] << 1) << (127 - j)) | (xx.i[1] >> (j - 96)); + if (((xx.i[1] << 1) << (127 - j)) | xx.i[2] | xx.i[3]) + frac |= 1; + } else if (j >= 64) { + zz.i[0] = xx.i[0] >> (j - 64); + zz.i[1] = ((xx.i[0] << 1) << (95 - j)) | (xx.i[1] >> (j - 64)); + frac = ((xx.i[1] << 1) << (95 - j)) | (xx.i[2] >> (j - 64)); + if (((xx.i[2] << 1) << (95 - j)) | xx.i[3]) + frac |= 1; + } else { + zz.i[0] = ((xx.i[0] << 1) << (63 - j)) | (xx.i[1] >> (j - 32)); + zz.i[1] = ((xx.i[1] << 1) << (63 - j)) | (xx.i[2] >> (j - 32)); + frac = ((xx.i[2] << 1) << (63 - j)) | (xx.i[3] >> (j - 32)); + if ((xx.i[3] << 1) << (63 - j)) + frac |= 1; + } + + /* round */ + if (frac >= 0x80000000u) { + if (++zz.i[1] == 0) + zz.i[0]++; + } + + /* check for result out of range (note that z is |x| at this point) */ + if (zz.i[0] > 0x80000000u || (zz.i[0] == 0x80000000 && (zz.i[1] || + !sx))) { + tt.i = sx | 0x7f000000; + return ((long long) tt.f); + } + + /* negate result if need be */ + if (sx) { + zz.i[0] = ~zz.i[0]; + zz.i[1] = -zz.i[1]; + if (zz.i[1] == 0) + zz.i[0]++; + } + + return (zz.l); +} +#elif defined(__x86) +long long +llroundl(long double x) { + union { + unsigned i[3]; + long double e; + } xx; + int ex, sx, i; + + xx.e = x; + ex = xx.i[2] & 0x7fff; + sx = xx.i[2] & 0x8000; + + if (ex < 0x403e) { /* |x| < 2^63 */ + /* handle |x| < 1 */ + if (ex < 0x3fff) { + if (ex >= 0x3ffe) + return (sx ? -1LL : 1LL); + return (0LL); + } + + /* round x at the integer bit */ + if (ex < 0x401e) { + i = 1 << (0x401d - ex); + xx.i[1] = (xx.i[1] + i) & ~(i | (i - 1)); + xx.i[0] = 0; + } else { + i = 1 << (0x403d - ex); + xx.i[0] += i; + if (xx.i[0] < i) + xx.i[1]++; + xx.i[0] &= ~(i | (i - 1)); + } + if (xx.i[1] == 0) { + xx.i[2] = sx | ++ex; + xx.i[1] = 0x80000000U; + } + } + + /* now x is nan, inf, or integral */ + return ((long long) xx.e); +} +#else +#error Unknown architecture +#endif |