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d8742dd8 | 1 | /* Add _Float64 values, converting the result to _Float32x. i386 version. |
2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
d8742dd8 JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d8742dd8 JM |
18 | |
19 | #include <math.h> | |
20 | #include <fpu_control.h> | |
aaee3cd8 | 21 | #include <math-narrow-eval.h> |
d8742dd8 JM |
22 | #include <math-narrow.h> |
23 | ||
24 | _Float32x | |
25 | __f32xaddf64 (_Float64 x, _Float64 y) | |
26 | { | |
27 | /* To avoid double rounding, set double precision for the addition. | |
28 | math_narrow_eval is still needed to eliminate excess range in the | |
29 | case of overflow. If the result of the addition is in the | |
30 | subnormal range for double, it is exact, so no issues of double | |
31 | rounding for subnormals arise. */ | |
32 | fpu_control_t cw, cw_double; | |
33 | _FPU_GETCW (cw); | |
34 | cw_double = (cw & ~_FPU_EXTENDED) | _FPU_DOUBLE; | |
35 | _FPU_SETCW (cw_double); | |
36 | _Float32x ret = math_narrow_eval (x + y); | |
37 | _FPU_SETCW (cw); | |
38 | CHECK_NARROW_ADD (ret, x, y); | |
39 | return ret; | |
40 | } | |
41 | libm_alias_float32x_float64 (add) |