diff options
Diffstat (limited to 'sysdeps/sparc/sparc64/fpu/s_rint.S')
| -rw-r--r-- | sysdeps/sparc/sparc64/fpu/s_rint.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/fpu/s_rint.S b/sysdeps/sparc/sparc64/fpu/s_rint.S new file mode 100644 index 0000000000..38b6135de1 --- /dev/null +++ b/sysdeps/sparc/sparc64/fpu/s_rint.S @@ -0,0 +1,58 @@ +/* Round float to int floating-point values, sparc64 version. + Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by David S. Miller <davem@davemloft.net>, 2012. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + + /* We pop constants into the FPU registers using the incoming + * argument stack slots, since this avoid having to use any PIC + * references. We also thus avoid having to allocate a register + * window. + * + * VIS instructions are used to facilitate the formation of + * easier constants, and the propagation of the sign bit. + */ + +#define TWO_FIFTYTWO 0x43300000 /* 2**52 */ + +#define ZERO %f10 /* 0.0 */ +#define SIGN_BIT %f12 /* -0.0 */ + +ENTRY (__rint) + sethi %hi(TWO_FIFTYTWO), %o2 + sllx %o2, 32, %o2 + fzero ZERO + + fnegd ZERO, SIGN_BIT + stx %o2, [%sp + STACK_BIAS + 128] + fabsd %f0, %f14 + + ldd [%sp + STACK_BIAS + 128], %f16 + fcmpd %fcc3, %f14, %f16 + + fmovduge %fcc3, ZERO, %f16 + fand %f0, SIGN_BIT, SIGN_BIT + + for %f16, SIGN_BIT, %f16 + faddd %f0, %f16, %f6 + fsubd %f6, %f16, %f0 + fabsd %f0, %f0 + retl + for %f0, SIGN_BIT, %f0 +END (__rint) +weak_alias (__rint, rint) |