55 lines
1.0 KiB
ArmAsm
55 lines
1.0 KiB
ArmAsm
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/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*
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* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
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* Removed header file dependency for use in libmingwex.a by
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* Danny Smith <dannysmith@users.sourceforge.net>
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*/
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.file "log1pl.S"
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.text
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.align 4
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/* The fyl2xp1 can only be used for values in
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-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
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0.29 is a safe value.
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*/
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limit: .tfloat 0.29
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/* Please note: we use a double value here. Since 1.0 has
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an exact representation this does not effect the accuracy
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but it helps to optimize the code. */
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one: .double 1.0
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/*
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* Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
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* otherwise fyl2x with the needed extra computation.
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*/
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.globl _log1pl;
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.def _log1pl; .scl 2; .type 32; .endef
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_log1pl:
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fldln2
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fldt 4(%esp)
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fxam
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fnstsw
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fld %st
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sahf
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jc 3f // in case x is NaN or <EFBFBD>Inf
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4:
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fabs
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fldt limit
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fcompp
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fnstsw
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sahf
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jnc 2f
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faddl one
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fyl2x
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ret
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2: fyl2xp1
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ret
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3: jp 4b // in case x is <EFBFBD>Inf
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fstp %st(1)
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fstp %st(1)
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ret
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