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Make more code aarch64 friendly

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Justine Tunney 2023-05-02 13:38:16 -07:00
parent ca2860947f
commit 2b73e72d59
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568 changed files with 2197 additions and 1061 deletions
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libc/tinymath/atan_common.internal.h Normal file
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#ifndef COSMOPOLITAN_LIBC_TINYMATH_ATAN_COMMON_H_
#define COSMOPOLITAN_LIBC_TINYMATH_ATAN_COMMON_H_
#include "libc/tinymath/atan_data.internal.h"
#include "libc/tinymath/estrin_wrap.internal.h"
#include "libc/tinymath/horner.internal.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
// clang-format off
/*
* Double-precision polynomial evaluation function for scalar and vector atan(x)
* and atan2(y,x).
*
* Copyright (c) 2021-2023, Arm Limited.
* SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
*/
#if WANT_VMATH
#define DBL_T float64x2_t
#define P(i) v_f64 (__atan_poly_data.poly[i])
#else
#define DBL_T double
#define P(i) __atan_poly_data.poly[i]
#endif
/* Polynomial used in fast atan(x) and atan2(y,x) implementations
The order 19 polynomial P approximates (atan(sqrt(x))-sqrt(x))/x^(3/2). */
static inline DBL_T
eval_poly (DBL_T z, DBL_T az, DBL_T shift)
{
/* Use split Estrin scheme for P(z^2) with deg(P)=19. Use split instead of
full scheme to avoid underflow in x^16. */
DBL_T z2 = z * z;
DBL_T x2 = z2 * z2;
DBL_T x4 = x2 * x2;
DBL_T x8 = x4 * x4;
DBL_T y
= FMA (ESTRIN_11_ (z2, x2, x4, x8, P, 8), x8, ESTRIN_7 (z2, x2, x4, P));
/* Finalize. y = shift + z + z^3 * P(z^2). */
y = FMA (y, z2 * az, az);
y = y + shift;
return y;
}
#undef DBL_T
#undef FMA
#undef P
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_TINYMATH_ATAN_COMMON_H_ */