forked from KolibriOS/kolibrios
ace-dentandBurer
a4f3f3545a
- Move source code from `trunk` into root directory. - Update build files and ASM include paths. Add SPDX license header where appropriate. - These changes also update the CI build files in `.gitea/workflows/`. - Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden. (Work towards [#75](KolibriOS/kolibrios#75), point 3) --------- Co-authored-by: Burer <burer@kolibrios.org> Reviewed-on: KolibriOS/kolibrios#425 Reviewed-by: Mikhail Frolov <mixa.frolov2003@gmail.com> Reviewed-by: Burer <burer@kolibrios.org> Co-authored-by: Andrew <dent.ace@gmail.com> Co-committed-by: Andrew <dent.ace@gmail.com>
26 lines
623 B
C
26 lines
623 B
C
/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
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#include <math.h>
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double frexp(double x, int* exptr)
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{
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union {
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double d;
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unsigned char c[8];
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} u;
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u.d = x;
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/*
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* The format of the number is:
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* Sign, 12 exponent bits, 51 mantissa bits
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* The exponent is 1023 biased and there is an implicit zero.
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* We get the exponent from the upper bits and set the exponent
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* to 0x3fe (1022).
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*/
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*exptr = (int)(((u.c[7] & 0x7f) << 4) | (u.c[6] >> 4)) - 1022;
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u.c[7] &= 0x80;
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u.c[7] |= 0x3f;
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u.c[6] &= 0x0f;
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u.c[6] |= 0xe0;
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return u.d;
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}
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