| 1 | /* Fused multiply-add of double value, narrowing the result to float. |
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| 2 | x86 version. |
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| 3 | Copyright (C) 2021-2022 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 f32fmaf64 __hide_f32fmaf64 |
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| 21 | #define f32fmaf32x __hide_f32fmaf32x |
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| 22 | #define ffmal __hide_ffmal |
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| 23 | #include <math.h> |
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| 24 | #undef f32fmaf64 |
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| 25 | #undef f32fmaf32x |
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| 26 | #undef ffmal |
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| 27 | |
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| 28 | #include <math-narrow.h> |
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| 29 | |
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| 30 | #ifndef __FP_FAST_FMA |
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| 31 | /* Depending on the details of the glibc configuration, fma might use |
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| 32 | either SSE or 387 arithmetic; ensure that both parts of the |
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| 33 | floating-point state are handled in the round-to-odd code. If |
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| 34 | __FP_FAST_FMA is defined, that implies that the compiler is using |
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| 35 | SSE floating point and that the fma call will be inlined, so the |
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| 36 | x86 macros will work with only the SSE state and that is |
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| 37 | sufficient. */ |
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| 38 | # undef libc_feholdexcept_setround |
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| 39 | # define libc_feholdexcept_setround default_libc_feholdexcept_setround |
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| 40 | # undef libc_feupdateenv_test |
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| 41 | # define libc_feupdateenv_test default_libc_feupdateenv_test |
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| 42 | #endif |
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| 43 | |
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| 44 | float |
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| 45 | __ffma (double x, double y, double z) |
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| 46 | { |
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| 47 | NARROW_FMA_ROUND_TO_ODD (x, y, z, float, union ieee754_double, , mantissa1, |
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| 48 | false); |
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| 49 | } |
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| 50 | libm_alias_float_double (fma) |
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| 51 | |
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