1 /* Round float to int floating-point values without generating
2 an inexact exception, sparc64 version.
4 Copyright (C) 2013-2019 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6 Contributed by David S. Miller <davem@davemloft.net>, 2013.
8 The GNU C Library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 2.1 of the License, or (at your option) any later version.
13 The GNU C Library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public
19 License along with the GNU C Library; if not, see
20 <https://www.gnu.org/licenses/>. */
23 #include <libm-alias-float.h>
25 /* We pop constants into the FPU registers using the incoming
26 argument stack slots, since this avoid having to use any PIC
27 references. We also thus avoid having to allocate a register
30 VIS instructions are used to facilitate the formation of
31 easier constants, and the propagation of the sign bit. */
33 #define TWO_TWENTYTHREE 0x4b000000 /* 2**23 */
35 #define ZERO %f10 /* 0.0 */
36 #define SIGN_BIT %f12 /* -0.0 */
39 fcmps %fcc3, %f1, %f1 /* Check for sNaN */
40 stx %fsr, [%sp + STACK_BIAS + 144]
41 sethi %hi(0xf8003e0), %o5
42 sethi %hi(TWO_TWENTYTHREE), %o2
43 ldx [%sp + STACK_BIAS + 144], %o4
44 or %o5, %lo(0xf8003e0), %o5
48 st %o2, [%sp + STACK_BIAS + 128]
49 stx %o4, [%sp + STACK_BIAS + 136]
50 ldx [%sp + STACK_BIAS + 136], %fsr
52 ld [%sp + STACK_BIAS + 128], %f16
53 fcmps %fcc3, %f14, %f16
54 fmovsuge %fcc3, ZERO, %f16
55 fands %f1, SIGN_BIT, SIGN_BIT
56 fors %f16, SIGN_BIT, %f16
60 fors %f0, SIGN_BIT, %f0
62 ldx [%sp + STACK_BIAS + 144], %fsr
64 libm_alias_float (__nearbyint, nearbyint)