From 1305df184d9d04274ce170864c92af8cbeae23e2 Mon Sep 17 00:00:00 2001
From: nsz <nsz@port70.net>
Date: Sun, 11 Mar 2012 02:11:26 +0100
Subject: [PATCH] add TODO list

---
 TODO | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 TODO

diff --git a/TODO b/TODO
new file mode 100644
index 0000000..1d4405c
--- /dev/null
+++ b/TODO
@@ -0,0 +1,64 @@
+ldhack.h fix:
+	move ldouble manipulation into arch specific headers
+long double isnan, isinf..:
+	efficient macro versions of long double classification macros?
+	(they are ld* representation specific)
+lrint:
+	does inexact allowed on overflow?
+	see c99 7.12, 7.12.9.5, F.9, F.9.6.5
+small file cleanups:
+	if libm.h internals is not needed (ldexp,..) then include math.h only
+	LD64 wrap small long double functions as well
+trigonometric functions:
+	__rem_pio_large: is returning 2 bits enough?
+	__tan: 3rd arg semantics is probably not optimal
+	sinf,cosf: return sindf(-y) vs -sindf(y)?
+	__sin,__cos,..: z,w,.. -> x2,x4,.. so degree is easier to see
+	__rem_pio2*: rounding trick: simply use the low 32 bits of fn?
+nan:
+	use strtod? c99 7.12.11.2
+scalbf:
+	scalb is buggy, do we need the *f and *l version?
+scalbn:
+	needs a rewrite: signed int problems, wrong <-50000 check
+__ldexp_cexp:
+	only complex in math/, move to cmath?
+j0l, y0l,..:
+	declare long double bessel functions in math.h?
+uniform inexact exception raising:
+	(int)x == 0 and huge+x > 0 are used
+	unreachable code is not commented and hard to follow
+generic code fixes:
+	int32_t -> uint32_t conversion (subtle)
+	+= 1, -= 1 -> ++, --
+	TWO52, one, zero, twom1000,.. -> use reasonable consts
+	(float)1 -> 1.0f
+	ldexp -> use scalbn internally (ldexp is a wrapper)
+	i386 vs precision -> assume extended prec setting
+	long double const trunc/slowness bug
+	remove "unsupported long double format" checks
+	sign bit (sqrt)
+fma:
+	expects single 53bit rounding
+	rewrite using long double arithmetics?
+log2:
+	dekker vs long double arithmetics
+tgamma:
+	missing
+	lanczos approx as in boost/math/special_functions, python/Modules/mathmodule.c
+	or bsd tgamma
+complex
+	optimizable creal cimag (libm.h macro for internal code?)
+	test? (using mdc lib, available test vectors,..)
+	Kahan, W. "Branch Cuts for Complex Elementary Functions, or Much Ado About Nothing's Sign Bit." 1987
+	Hull, Fairgrieve, Tang "Implementing complex elementary functions using exception handling" 1994
+	Hull, Fairgrieve, Tang "Implementing the complex arcsine and arccosine functions using exception handling" 1997
+	boost/math/complex
+	python/Modules/cmathmodule.c (+math, cmath tests)
+asm:
+	i386, x86_64 asm versions
+libm test
+	test vectors
+	special cases from c99 F.9, G
+	randomized test using mpfr
+arm fenv?
-- 
2.20.1