mirror of git://sourceware.org/git/glibc.git
40 lines
893 B
C
40 lines
893 B
C
#include <math.h>
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#include <errno.h>
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#include <limits.h>
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#include <math_private.h>
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#include <fenv.h>
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#if _GL_HAS_BUILTIN_ILOGB
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long int
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M_DECL_FUNC (__llogb) (FLOAT x)
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{
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int r;
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/* Check for exceptional cases. */
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if (! M_SUF(__builtin_test_dc_ilogb) (x, 0x7f))
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r = M_SUF (__builtin_ilogb) (x);
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else
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/* Fallback to the generic ilogb if x is NaN, Inf or subnormal. */
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r = M_SUF (__ieee754_ilogb) (x);
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long int lr = r;
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if (__glibc_unlikely (r == FP_ILOGB0)
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|| __glibc_unlikely (r == FP_ILOGBNAN)
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|| __glibc_unlikely (r == INT_MAX))
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{
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#if LONG_MAX != INT_MAX
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if (r == FP_ILOGB0)
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lr = FP_LLOGB0;
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else if (r == FP_ILOGBNAN)
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lr = FP_LLOGBNAN;
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else
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lr = LONG_MAX;
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#endif
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__set_errno (EDOM);
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__feraiseexcept (FE_INVALID);
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}
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return lr;
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}
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declare_mgen_alias (__llogb, llogb)
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#else
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#include <math/w_llogb_template.c>
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#endif
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