42 lines
705 B
C
42 lines
705 B
C
/*
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* Copyright (c) 2005-2020 Rich Felker, et al.
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*
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* SPDX-License-Identifier: MIT
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*
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* Please see https://git.musl-libc.org/cgit/musl/tree/COPYRIGHT
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* for all contributors to musl.
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*/
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#include <math.h>
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#include <stdint.h>
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float scalbnf(float x, int n)
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{
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union {float f; uint32_t i;} u;
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float_t y = x;
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if (n > 127) {
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y *= 0x1p127f;
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n -= 127;
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if (n > 127) {
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y *= 0x1p127f;
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n -= 127;
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if (n > 127)
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n = 127;
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}
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} else if (n < -126) {
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y *= 0x1p-126f * 0x1p24f;
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n += 126 - 24;
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if (n < -126) {
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y *= 0x1p-126f * 0x1p24f;
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n += 126 - 24;
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if (n < -126)
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n = -126;
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}
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}
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u.i = (uint32_t)(0x7f+n)<<23;
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x = y * u.f;
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return x;
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}
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__strong_reference(scalbnf, ldexpf);
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