diff options
Diffstat (limited to 'usr/src/lib/libm/common/m9x/llrintl.c')
| -rw-r--r-- | usr/src/lib/libm/common/m9x/llrintl.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/usr/src/lib/libm/common/m9x/llrintl.c b/usr/src/lib/libm/common/m9x/llrintl.c new file mode 100644 index 0000000000..e58a6a83ca --- /dev/null +++ b/usr/src/lib/libm/common/m9x/llrintl.c @@ -0,0 +1,175 @@ +/* + * 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 llrintl = __llrintl +#if defined(__sparcv9) || defined(__amd64) +#pragma weak lrintl = __llrintl +#pragma weak __lrintl = __llrintl +#endif +#endif + +#include "libm.h" + +#if defined(__sparc) + +#include "fma.h" +#include "fenv_inlines.h" + +long long +llrintl(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 int hx, sx, frac, fsr; + int rm, j; + volatile float dummy; + + 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); + } else if ((hx | xx.i[1] | xx.i[2] | xx.i[3]) == 0) /* x is zero */ + return (0LL); + + /* get the rounding mode */ + __fenv_getfsr32(&fsr); + rm = fsr >> 30; + + /* flip the sense of directed roundings if x is negative */ + if (sx) + rm ^= rm >> 1; + + /* handle |x| < 1 */ + if (hx < 0x3fff0000) { + dummy = 1.0e30f; /* x is nonzero, so raise inexact */ + dummy += 1.0e-30f; + if (rm == FSR_RP || (rm == FSR_RN && (hx >= 0x3ffe0000 && + ((hx & 0xffff) | xx.i[1] | xx.i[2] | xx.i[3])))) + 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 && (rm == FSR_RP || (rm == FSR_RN && (frac > 0x80000000u || + (frac == 0x80000000 && (zz.i[1] & 1)))))) { + 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); + } + + /* raise inexact if need be */ + if (frac) { + dummy = 1.0e30F; + dummy += 1.0e-30F; + } + + /* 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 +llrintl(long double x) { + /* + * Note: The following code works on x86 (in the default rounding + * precision mode), but one ought to just use the fistpll instruction + * instead. + */ + union { + unsigned i[3]; + long double e; + } xx, yy; + int ex; + + xx.e = x; + ex = xx.i[2] & 0x7fff; + + if (ex < 0x403e) { /* |x| < 2^63 */ + /* add and subtract a power of two to round x to an integer */ + yy.i[2] = (xx.i[2] & 0x8000) | 0x403e; + yy.i[1] = 0x80000000; + yy.i[0] = 0; + x = (x + yy.e) - yy.e; + } + + /* now x is nan, inf, or integral */ + return ((long long) x); +} +#else +#error Unknown architecture +#endif |