| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| |
| #ifdef _WIN64 |
| // These are copied defines from fdlibm.h, this allows us to keep the code |
| // the same as in the JDK, for easier maintenance. |
| |
| #define __HI(x) *(1+(int*)&x) |
| #define __LO(x) *(int*)&x |
| |
| // This code is a copy of __ieee754_fmod() from the JDK's libfdlibm and is |
| // used as a workaround for issues with the Windows x64 CRT implementation |
| // of fmod. Microsoft has acknowledged that this is an issue in Visual Studio |
| // 2012 and forward, but has not provided a time frame for a fix other than that |
| // it'll not be fixed in Visual Studio 2013 or 2015. |
| |
| static const double one = 1.0, Zero[] = { 0.0, -0.0, }; |
| |
| double SharedRuntime::fmod_winx64(double x, double y) |
| { |
| int n, hx, hy, hz, ix, iy, sx, i; |
| unsigned lx, ly, lz; |
| |
| hx = __HI(x); /* high word of x */ |
| lx = __LO(x); /* low word of x */ |
| hy = __HI(y); /* high word of y */ |
| ly = __LO(y); /* low word of y */ |
| sx = hx & 0x80000000; /* sign of x */ |
| hx ^= sx; /* |x| */ |
| hy &= 0x7fffffff; /* |y| */ |
| |
| #pragma warning( disable : 4146 ) |
| /* purge off exception values */ |
| if ((hy | ly) == 0 || (hx >= 0x7ff00000) || /* y=0,or x not finite */ |
| ((hy | ((ly | -ly) >> 31))>0x7ff00000)) /* or y is NaN */ |
| #pragma warning( default : 4146 ) |
| return (x*y) / (x*y); |
| if (hx <= hy) { |
| if ((hx<hy) || (lx<ly)) return x; /* |x|<|y| return x */ |
| if (lx == ly) |
| return Zero[(unsigned)sx >> 31]; /* |x|=|y| return x*0*/ |
| } |
| |
| /* determine ix = ilogb(x) */ |
| if (hx<0x00100000) { /* subnormal x */ |
| if (hx == 0) { |
| for (ix = -1043, i = lx; i>0; i <<= 1) ix -= 1; |
| } |
| else { |
| for (ix = -1022, i = (hx << 11); i>0; i <<= 1) ix -= 1; |
| } |
| } |
| else ix = (hx >> 20) - 1023; |
| |
| /* determine iy = ilogb(y) */ |
| if (hy<0x00100000) { /* subnormal y */ |
| if (hy == 0) { |
| for (iy = -1043, i = ly; i>0; i <<= 1) iy -= 1; |
| } |
| else { |
| for (iy = -1022, i = (hy << 11); i>0; i <<= 1) iy -= 1; |
| } |
| } |
| else iy = (hy >> 20) - 1023; |
| |
| /* set up {hx,lx}, {hy,ly} and align y to x */ |
| if (ix >= -1022) |
| hx = 0x00100000 | (0x000fffff & hx); |
| else { /* subnormal x, shift x to normal */ |
| n = -1022 - ix; |
| if (n <= 31) { |
| hx = (hx << n) | (lx >> (32 - n)); |
| lx <<= n; |
| } |
| else { |
| hx = lx << (n - 32); |
| lx = 0; |
| } |
| } |
| if (iy >= -1022) |
| hy = 0x00100000 | (0x000fffff & hy); |
| else { /* subnormal y, shift y to normal */ |
| n = -1022 - iy; |
| if (n <= 31) { |
| hy = (hy << n) | (ly >> (32 - n)); |
| ly <<= n; |
| } |
| else { |
| hy = ly << (n - 32); |
| ly = 0; |
| } |
| } |
| |
| /* fix point fmod */ |
| n = ix - iy; |
| while (n--) { |
| hz = hx - hy; lz = lx - ly; if (lx<ly) hz -= 1; |
| if (hz<0){ hx = hx + hx + (lx >> 31); lx = lx + lx; } |
| else { |
| if ((hz | lz) == 0) /* return sign(x)*0 */ |
| return Zero[(unsigned)sx >> 31]; |
| hx = hz + hz + (lz >> 31); lx = lz + lz; |
| } |
| } |
| hz = hx - hy; lz = lx - ly; if (lx<ly) hz -= 1; |
| if (hz >= 0) { hx = hz; lx = lz; } |
| |
| /* convert back to floating value and restore the sign */ |
| if ((hx | lx) == 0) /* return sign(x)*0 */ |
| return Zero[(unsigned)sx >> 31]; |
| while (hx<0x00100000) { /* normalize x */ |
| hx = hx + hx + (lx >> 31); lx = lx + lx; |
| iy -= 1; |
| } |
| if (iy >= -1022) { /* normalize output */ |
| hx = ((hx - 0x00100000) | ((iy + 1023) << 20)); |
| __HI(x) = hx | sx; |
| __LO(x) = lx; |
| } |
| else { /* subnormal output */ |
| n = -1022 - iy; |
| if (n <= 20) { |
| lx = (lx >> n) | ((unsigned)hx << (32 - n)); |
| hx >>= n; |
| } |
| else if (n <= 31) { |
| lx = (hx << (32 - n)) | (lx >> n); hx = sx; |
| } |
| else { |
| lx = hx >> (n - 32); hx = sx; |
| } |
| __HI(x) = hx | sx; |
| __LO(x) = lx; |
| x *= one; /* create necessary signal */ |
| } |
| return x; /* exact output */ |
| } |
| |
| #endif |