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Makefile.am (libquadmath_la_SOURCES): Add math/logbq.c.
* Makefile.am (libquadmath_la_SOURCES): Add math/logbq.c. * Makefile.in: Regenerate. * libquadmath.texi: Document logbq. * quadmath.h: Add logbq prototype. * quadmath.map: Add logbq. * quadmath_weak.h: Add logbq prototype. * math/logbq.c: New file From-SVN: r226748
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,47 @@ | ||
/* s_logbl.c -- long double version of s_logb.c. | ||
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. | ||
*/ | ||
|
||
/* | ||
* ==================================================== | ||
* 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. | ||
* ==================================================== | ||
*/ | ||
|
||
/* | ||
* long double logbl(x) | ||
* IEEE 754 logb. Included to pass IEEE test suite. Not recommend. | ||
* Use ilogb instead. | ||
*/ | ||
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#include "quadmath-imp.h" | ||
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__float128 | ||
logbq (__float128 x) | ||
{ | ||
int64_t lx, hx, ex; | ||
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GET_FLT128_WORDS64 (hx, lx, x); | ||
hx &= 0x7fffffffffffffffLL; /* high |x| */ | ||
if ((hx | lx) == 0) | ||
return -1.0 / fabsq (x); | ||
if (hx >= 0x7fff000000000000LL) | ||
return x * x; | ||
if ((ex = hx >> 48) == 0) /* IEEE 754 logb */ | ||
{ | ||
/* POSIX specifies that denormal number is treated as | ||
though it were normalized. */ | ||
int ma; | ||
if (hx == 0) | ||
ma = __builtin_clzll (lx) + 64; | ||
else | ||
ma = __builtin_clzll (hx); | ||
ex -= ma - 16; | ||
} | ||
return (__float128) (ex - 16383); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -96,3 +96,8 @@ QUADMATH_1.0 { | |
local: | ||
*; | ||
}; | ||
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QUADMATH_1.1 { | ||
global: | ||
logbq; | ||
} QUADMATH_1.0; |
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