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Diffstat (limited to 'winsup/mingw/mingwex/math/log1p.S')
| -rw-r--r-- | winsup/mingw/mingwex/math/log1p.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/log1p.S b/winsup/mingw/mingwex/math/log1p.S new file mode 100644 index 000000000..a38816cb3 --- /dev/null +++ b/winsup/mingw/mingwex/math/log1p.S @@ -0,0 +1,47 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + * Removed header file dependency for use in libmingwex.a by + * Danny Smith <dannysmith@users.sourceforge.net> + */ + + .file "log1p.S" + .text + .align 4 + /* The fyl2xp1 can only be used for values in + -1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2 + 0.29 is a safe value. + */ +limit: .double 0.29 +one: .double 1.0 +/* + * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29, + * otherwise fyl2x with the needed extra computation. + */ +.globl _log1p; + .def _log1p; .scl 2; .type 32; .endef +_log1p: + fldln2 + fldl 4(%esp) + fxam + fnstsw + fld %st + sahf + jc 3f // in case x is NaN or ħInf + +4: fabs + fcompl limit + fnstsw + sahf + jc 2f + faddl one + fyl2x + ret + +2: fyl2xp1 + ret + +3: jp 4b // in case x is ħInf + fstp %st(1) + fstp %st(1) + ret |