| 1 | /* Single-precision math error handling. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include "math_config.h" |
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| 20 | |
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| 21 | #if WANT_ERRNO |
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| 22 | # include <errno.h> |
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| 23 | /* NOINLINE reduces code size. */ |
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| 24 | NOINLINE static float |
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| 25 | with_errnof (float y, int e) |
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| 26 | { |
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| 27 | errno = e; |
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| 28 | return y; |
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| 29 | } |
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| 30 | #else |
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| 31 | # define with_errnof(x, e) (x) |
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| 32 | #endif |
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| 33 | |
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| 34 | /* NOINLINE prevents fenv semantics breaking optimizations. */ |
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| 35 | NOINLINE static float |
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| 36 | xflowf (uint32_t sign, float y) |
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| 37 | { |
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| 38 | y = (sign ? -y : y) * y; |
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| 39 | return with_errnof (y, ERANGE); |
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| 40 | } |
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| 41 | |
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| 42 | attribute_hidden float |
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| 43 | __math_uflowf (uint32_t sign) |
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| 44 | { |
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| 45 | return xflowf (sign, y: 0x1p-95f); |
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| 46 | } |
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| 47 | |
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| 48 | #if WANT_ERRNO_UFLOW |
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| 49 | /* Underflows to zero in some non-nearest rounding mode, setting errno |
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| 50 | is valid even if the result is non-zero, but in the subnormal range. */ |
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| 51 | attribute_hidden float |
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| 52 | __math_may_uflowf (uint32_t sign) |
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| 53 | { |
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| 54 | return xflowf (sign, y: 0x1.4p-75f); |
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| 55 | } |
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| 56 | #endif |
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| 57 | |
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| 58 | attribute_hidden float |
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| 59 | __math_oflowf (uint32_t sign) |
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| 60 | { |
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| 61 | return xflowf (sign, y: 0x1p97f); |
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| 62 | } |
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| 63 | |
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| 64 | attribute_hidden float |
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| 65 | __math_divzerof (uint32_t sign) |
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| 66 | { |
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| 67 | float y = 0; |
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| 68 | return with_errnof (y: (sign ? -1 : 1) / y, ERANGE); |
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| 69 | } |
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| 70 | |
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| 71 | attribute_hidden float |
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| 72 | __math_invalidf (float x) |
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| 73 | { |
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| 74 | float y = (x - x) / (x - x); |
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| 75 | return isnan (x) ? y : with_errnof (y, EDOM); |
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| 76 | } |
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| 77 | |
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