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a44bc679a4
When HAVE_FAST_FMAF is set, use the vfma.f32 instruction, when HAVE_FAST_FMA is set, use the vfma.f64 instruction. Usually the compiler built-ins will already have inlined these instructions, but provide these symbols for cases where that doesn't work instead of falling back to the (inaccurate) common code versions. Signed-off-by: Keith Packard <keithp@keithp.com>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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#include "fdlibm.h"
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#if !HAVE_FAST_FMAF
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#ifdef __STDC__
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float fmaf(float x, float y, float z)
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#else
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float fmaf(x,y,z)
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float x;
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float y;
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float z;
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#endif
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{
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/* NOTE: The floating-point exception behavior of this is not as
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* required. But since the basic function is not really done properly,
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* it is not worth bothering to get the exceptions right, either. */
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/* Let the implementation handle this. */ /* <= NONSENSE! */
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/* In floating-point implementations in which double is larger than float,
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* computing as double should provide the desired function. Otherwise,
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* the behavior will not be as specified in the standards. */
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return (float) (((double) x * (double) y) + (double) z);
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}
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#endif
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double fma(double x, double y, double z)
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#else
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double fma(x,y,z)
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double x;
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double y;
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double z;
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#endif
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{
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return (double) fmaf((float) x, (float) y, (float) z);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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