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Make quality improvements

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- Write some more unit tests
- memcpy() on ARM is now faster
- Address the Musl complex math FIXME comments
- Some libm funcs like pow() now support setting errno
- Import the latest and greatest math functions from ARM
- Use more accurate atan2f() and log1pf() implementations
- atoi() and atol() will no longer saturate or clobber errno
This commit is contained in:
Justine Tunney 2024-02-25 14:57:28 -08:00
parent af8f2bd19f
commit 592f6ebc20
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122 changed files with 6305 additions and 3859 deletions
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libc/tinymath/math_errf.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╚──────────────────────────────────────────────────────────────────────────────╝
│ │
│ Optimized Routines │
│ Copyright (c) 2018-2024, Arm Limited. │
│ │
│ Permission is hereby granted, free of charge, to any person obtaining │
│ a copy of this software and associated documentation files (the │
│ "Software"), to deal in the Software without restriction, including │
│ without limitation the rights to use, copy, modify, merge, publish, │
│ distribute, sublicense, and/or sell copies of the Software, and to │
│ permit persons to whom the Software is furnished to do so, subject to │
│ the following conditions: │
│ │
│ The above copyright notice and this permission notice shall be │
│ included in all copies or substantial portions of the Software. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
│ │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/tinymath/arm.internal.h"
#if WANT_ERRNO
/* dontinline reduces code size and avoids making math functions non-leaf
when the error handling is inlined. */
dontinline static float
with_errnof (float y, int e)
{
errno = e;
return y;
}
#else
#define with_errnof(x, e) (x)
#endif
/* dontinline reduces code size. */
dontinline static float
xflowf (uint32_t sign, float y)
{
y = eval_as_float (opt_barrier_float (sign ? -y : y) * y);
return with_errnof (y, ERANGE);
}
float
__math_uflowf (uint32_t sign)
{
return xflowf (sign, 0x1p-95f);
}
#if WANT_ERRNO_UFLOW
/* Underflows to zero in some non-nearest rounding mode, setting errno
is valid even if the result is non-zero, but in the subnormal range. */
float
__math_may_uflowf (uint32_t sign)
{
return xflowf (sign, 0x1.4p-75f);
}
#endif
float
__math_oflowf (uint32_t sign)
{
return xflowf (sign, 0x1p97f);
}
float
__math_divzerof (uint32_t sign)
{
float y = opt_barrier_float (sign ? -1.0f : 1.0f) / 0.0f;
return with_errnof (y, ERANGE);
}
dontinstrument float
__math_invalidf (float x)
{
float y = (x - x) / (x - x);
return isnan (x) ? y : with_errnof (y, EDOM);
}
/* Check result and set errno if necessary. */
dontinstrument float
__math_check_uflowf (float y)
{
return y == 0.0f ? with_errnof (y, ERANGE) : y;
}
dontinstrument float
__math_check_oflowf (float y)
{
return isinf (y) ? with_errnof (y, ERANGE) : y;
}