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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* Fused multiply-add of long double (ldbl-128) values, narrowing the result to
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double, using soft-fp.
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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 f32xfmaf64x __hide_f32xfmaf64x
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#define f32xfmaf128 __hide_f32xfmaf128
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#define f64fmaf64x __hide_f64fmaf64x
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#define f64fmaf128 __hide_f64fmaf128
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#include <math.h>
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#undef f32xfmaf64x
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#undef f32xfmaf128
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#undef f64fmaf64x
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#undef f64fmaf128
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#include <math-narrow.h>
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#include <libc-diag.h>
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/* R_e is not set in cases where it is not used in packing, but the
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compiler does not see that it is set in all cases where it is
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used, resulting in warnings that it may be used uninitialized.
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The location of the warning differs in different versions of GCC,
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it may be where R is defined using a macro or it may be where the
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macro is defined. */
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DIAG_PUSH_NEEDS_COMMENT;
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DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized");
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#include <soft-fp.h>
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#include <double.h>
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#include <quad.h>
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double
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__dfmal (_Float128 x, _Float128 y, _Float128 z)
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{
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FP_DECL_EX;
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FP_DECL_Q (X);
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FP_DECL_Q (Y);
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FP_DECL_Q (Z);
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FP_DECL_Q (R);
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FP_DECL_D (RN);
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double ret;
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FP_INIT_ROUNDMODE;
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FP_UNPACK_Q (X, x);
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FP_UNPACK_Q (Y, y);
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FP_UNPACK_Q (Z, z);
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FP_FMA_Q (R, X, Y, Z);
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#if _FP_W_TYPE_SIZE < 64
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FP_TRUNC_COOKED (D, Q, 2, 4, RN, R);
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#else
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FP_TRUNC_COOKED (D, Q, 1, 2, RN, R);
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#endif
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FP_PACK_D (ret, RN);
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FP_HANDLE_EXCEPTIONS;
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CHECK_NARROW_FMA (ret, x, y, z);
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return ret;
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}
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DIAG_POP_NEEDS_COMMENT;
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libm_alias_double_ldouble (fma)
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