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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /sysdeps/ieee754/dbl-64/s_scalbln.c | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_scalbln.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_scalbln.c | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_scalbln.c b/sysdeps/ieee754/dbl-64/s_scalbln.c deleted file mode 100644 index 32cd12e3b0..0000000000 --- a/sysdeps/ieee754/dbl-64/s_scalbln.c +++ /dev/null @@ -1,63 +0,0 @@ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -/* - * scalbn (double x, int n) - * scalbn(x,n) returns x* 2**n computed by exponent - * manipulation rather than by actually performing an - * exponentiation or a multiplication. - */ - -#include <math.h> -#include <math_private.h> - -static const double - two54 = 1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */ - twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */ - huge = 1.0e+300, - tiny = 1.0e-300; - -double -__scalbln (double x, long int n) -{ - int32_t k, hx, lx; - EXTRACT_WORDS (hx, lx, x); - k = (hx & 0x7ff00000) >> 20; /* extract exponent */ - if (__glibc_unlikely (k == 0)) /* 0 or subnormal x */ - { - if ((lx | (hx & 0x7fffffff)) == 0) - return x; /* +-0 */ - x *= two54; - GET_HIGH_WORD (hx, x); - k = ((hx & 0x7ff00000) >> 20) - 54; - } - if (__glibc_unlikely (k == 0x7ff)) - return x + x; /* NaN or Inf */ - if (__glibc_unlikely (n < -50000)) - return tiny * __copysign (tiny, x); /*underflow*/ - if (__glibc_unlikely (n > 50000 || k + n > 0x7fe)) - return huge * __copysign (huge, x); /* overflow */ - /* Now k and n are bounded we know that k = k+n does not - overflow. */ - k = k + n; - if (__glibc_likely (k > 0)) /* normal result */ - { - SET_HIGH_WORD (x, (hx & 0x800fffff) | (k << 20)); return x; - } - if (k <= -54) - return tiny * __copysign (tiny, x); /*underflow*/ - k += 54; /* subnormal result */ - SET_HIGH_WORD (x, (hx & 0x800fffff) | (k << 20)); - return x * twom54; -} -#ifdef NO_LONG_DOUBLE -strong_alias (__scalbln, __scalblnl) -#endif |