| 1 | /* Fused multiply-add of long double (ldbl-128) values, narrowing the result to |
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| 2 | double, using soft-fp. |
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| 3 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #define f32xfmaf64x __hide_f32xfmaf64x |
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| 21 | #define f32xfmaf128 __hide_f32xfmaf128 |
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| 22 | #define f64fmaf64x __hide_f64fmaf64x |
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| 23 | #define f64fmaf128 __hide_f64fmaf128 |
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| 24 | #include <math.h> |
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| 25 | #undef f32xfmaf64x |
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| 26 | #undef f32xfmaf128 |
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| 27 | #undef f64fmaf64x |
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| 28 | #undef f64fmaf128 |
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| 29 | |
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| 30 | #include <math-narrow.h> |
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| 31 | #include <libc-diag.h> |
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| 32 | |
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| 33 | /* R_e is not set in cases where it is not used in packing, but the |
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| 34 | compiler does not see that it is set in all cases where it is |
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| 35 | used, resulting in warnings that it may be used uninitialized. |
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| 36 | The location of the warning differs in different versions of GCC, |
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| 37 | it may be where R is defined using a macro or it may be where the |
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| 38 | macro is defined. */ |
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| 39 | DIAG_PUSH_NEEDS_COMMENT; |
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| 40 | DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized" ); |
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| 41 | |
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| 42 | #include <soft-fp.h> |
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| 43 | #include <double.h> |
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| 44 | #include <quad.h> |
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| 45 | |
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| 46 | double |
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| 47 | __dfmal (_Float128 x, _Float128 y, _Float128 z) |
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| 48 | { |
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| 49 | FP_DECL_EX; |
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| 50 | FP_DECL_Q (X); |
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| 51 | FP_DECL_Q (Y); |
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| 52 | FP_DECL_Q (Z); |
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| 53 | FP_DECL_Q (R); |
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| 54 | FP_DECL_D (RN); |
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| 55 | double ret; |
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| 56 | |
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| 57 | FP_INIT_ROUNDMODE; |
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| 58 | FP_UNPACK_Q (X, x); |
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| 59 | FP_UNPACK_Q (Y, y); |
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| 60 | FP_UNPACK_Q (Z, z); |
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| 61 | FP_FMA_Q (R, X, Y, Z); |
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| 62 | #if _FP_W_TYPE_SIZE < 64 |
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| 63 | FP_TRUNC_COOKED (D, Q, 2, 4, RN, R); |
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| 64 | #else |
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| 65 | FP_TRUNC_COOKED (D, Q, 1, 2, RN, R); |
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| 66 | #endif |
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| 67 | FP_PACK_D (ret, RN); |
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| 68 | FP_HANDLE_EXCEPTIONS; |
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| 69 | CHECK_NARROW_FMA (ret, x, y, z); |
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| 70 | return ret; |
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| 71 | } |
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| 72 | DIAG_POP_NEEDS_COMMENT; |
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| 73 | |
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| 74 | libm_alias_double_ldouble (fma) |
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| 75 | |
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