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51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/* Fused multiply-add of double value, narrowing the result to float.
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x86 version.
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Copyright (C) 2021-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define f32fmaf64 __hide_f32fmaf64
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#define f32fmaf32x __hide_f32fmaf32x
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#define ffmal __hide_ffmal
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#include <math.h>
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#undef f32fmaf64
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#undef f32fmaf32x
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#undef ffmal
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#include <math-narrow.h>
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#ifndef __FP_FAST_FMA
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/* Depending on the details of the glibc configuration, fma might use
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either SSE or 387 arithmetic; ensure that both parts of the
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floating-point state are handled in the round-to-odd code. If
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__FP_FAST_FMA is defined, that implies that the compiler is using
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SSE floating point and that the fma call will be inlined, so the
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x86 macros will work with only the SSE state and that is
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sufficient. */
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# undef libc_feholdexcept_setround
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# define libc_feholdexcept_setround default_libc_feholdexcept_setround
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# undef libc_feupdateenv_test
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# define libc_feupdateenv_test default_libc_feupdateenv_test
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#endif
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float
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__ffma (double x, double y, double z)
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{
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NARROW_FMA_ROUND_TO_ODD (x, y, z, float, union ieee754_double, , mantissa1,
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false);
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}
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libm_alias_float_double (fma)
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