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81 lines
1.5 KiB
81 lines
1.5 KiB
/*
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* Single-precision math error handling.
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*
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* Copyright (c) 2017-2020, Arm Limited.
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* SPDX-License-Identifier: MIT
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*/
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#include "math_config.h"
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#if WANT_ERRNO
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#include <errno.h>
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/* NOINLINE reduces code size and avoids making math functions non-leaf
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when the error handling is inlined. */
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NOINLINE static float
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with_errnof (float y, int e)
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{
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errno = e;
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return y;
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}
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#else
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#define with_errnof(x, e) (x)
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#endif
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/* NOINLINE reduces code size. */
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NOINLINE static float
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xflowf (uint32_t sign, float y)
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{
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y = eval_as_float (opt_barrier_float (sign ? -y : y) * y);
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return with_errnof (y, ERANGE);
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}
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HIDDEN float
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__math_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p-95f);
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}
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#if WANT_ERRNO_UFLOW
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/* Underflows to zero in some non-nearest rounding mode, setting errno
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is valid even if the result is non-zero, but in the subnormal range. */
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HIDDEN float
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__math_may_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1.4p-75f);
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}
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#endif
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HIDDEN float
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__math_oflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p97f);
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}
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HIDDEN float
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__math_divzerof (uint32_t sign)
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{
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float y = opt_barrier_float (sign ? -1.0f : 1.0f) / 0.0f;
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return with_errnof (y, ERANGE);
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}
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HIDDEN float
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__math_invalidf (float x)
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{
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float y = (x - x) / (x - x);
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return isnan (x) ? y : with_errnof (y, EDOM);
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}
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/* Check result and set errno if necessary. */
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HIDDEN float
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__math_check_uflowf (float y)
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{
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return y == 0.0f ? with_errnof (y, ERANGE) : y;
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}
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HIDDEN float
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__math_check_oflowf (float y)
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{
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return isinf (y) ? with_errnof (y, ERANGE) : y;
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}
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