mhx's articles:

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SSE2 6 34 (7/27/2012 2:20:26 PM) comp.lang.forth I had a fresh look at SSE2. Strangely, my tests fail to show up any performance difference with the good ol' FPU. The test I did is based on an SSE2 DDOT implementation (DDOT_sse2, vector multiplication).... mhx

Quotations revisited 110 41 (7/14/2012 1:54:37 PM) comp.lang.forth Recently, the subject of quotations popped up again and I remembered an unfinished project. It proves that in iForth (a simple form of) quotations takes only three lines of code. The main limitation is t... mhx

Auotations revisited 1 30 (7/14/2012 1:47:18 PM) comp.lang.forth Recently, the subject of quotations popped up again and I remembered an unfinished project. It proves that in iForth (a simple form of) quotations takes only three lines of code. The main limitation is t... mhx

World's toughest sudoku puzzle 15 45 (7/4/2012 6:15:36 PM) comp.lang.forth Bullshit detector going off with a bang ... "A Finnish PhD in mathematics, Arto Inkala, has allegedly created the world's toughest sudoku puzzle. 'There's no straightforward way to define the difficulty ... mhx

evplace (eigenvalue placement) 2 36 (6/4/2012 6:47:47 PM) comp.lang.forth I wanted to compute a state-feedback matrix K such that the eigenvalues of Phi-Gamma*K are those specified in a vector P. Phi and Gamma are defined as dx/dt = Phi*x + Gamma*u, with x the state variables an... mhx

Sum of squares 18 39 (3/26/2012 6:50:25 PM) comp.lang.forth Admit it (when trying it yourself), this exercise is surprisingly tricky. -marcel -- ------------------------------------------- (* * LANGUAGE : ANS Forth with extensions * PROJECT : Forth Environm... mhx

Sparse sets 2 43 (3/26/2012 6:49:13 PM) comp.lang.forth I have a hard time believing the quoted advantages of sparse sets myself, but it is a nice exercise where one can drop in a small Forth twist. I like the code a lot better than what can be found for other la... mhx

Perfect Square puzzle 0 101 (3/25/2012 8:53:25 PM) comp.lang.forth This is Perfect Square puzzle from the New Scientist. Quite nice and short solutions exist in other languages. Why not in Forth? FORTH> in samefivedigits.frt Creating --- Same Five Digits Version 0.01 ---... mhx

Special Squares 4 36 (3/24/2012 10:25:07 PM) comp.lang.forth Another puzzle in the vein of sumbrero. Although a brute-force solution may be possible, cutting impossible branches is more fun. Is there an 18-digit whole number x, such that the last 18 digits of x^2 are ... mhx

Set with unique members 1 41 (3/20/2012 6:24:21 PM) comp.lang.forth This is ugly code from sumbrero: : single2? ( a b -- bool ) = ; : single3? ( a b c -- bool ) 2DUP = >R 2 PICK = >R = R> OR R> OR ; : single4? ( a b c d -- bool ) LOCALS| d c b a | a b = ... mhx

mhx's replies:

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:r4 new compiler 2 60 (5/19/2012 2:46:19 PM) comp.lang.forth :r4 is another type of Forth, more precisely, a colorforth derivative. Instead of colors, it uses prefixes, the dictionary is an array, conditionals and control structures are different to the colorforth ones, ... pabloreda (225)

intersection of circles 6 65 (6/23/2012 12:31:55 AM) comp.lang.forth Surprisingly, the following problem isn't easily handled by a couple of scientific computing packages: If solution(s) exist, find the intersection points of two circles in the x-y plane. This requires solv... krishna.myneni (990)

Reverse factorial 3 43 (6/29/2012 1:51:29 AM) comp.lang.forth Here's a reverse factorial routine to wile away your free time. As the routine is highly f/p intensive it can double as a benchmark for testing relative performance between systems and implementation detai... invalid47 (646)

RfD: Make ENVIRONMENT? obsolescent 243 102 (7/4/2012 9:21:22 PM) comp.lang.forth Make ENVIRONMENT? obsolecent ============================ 20120704 Initial proposal Problem ======= The Forth-94 standard specified an environmental query system, which allows to query the system ... bernd.paysan (2408)

x64 assembler & RIP for call/jmp absolute indirect 6 90 (7/11/2012 4:25:39 PM) comp.lang.forth (posted to c.l.forth and c.l.asm.x86) While constructing a Forth assembler for x64 mode, I've added RIP addressing support, and come across a slight oddball encoding during testing the encodings. I've not ... blog1791 (5)

Why not more 'advanced' tools? 22 40 (7/11/2012 6:10:59 PM) comp.lang.forth Most things being true in one sense, and false in another. Why not more 'advanced' or complex tools? Because, the more the tools do for you, the more lax the programmer can become. As the programmer beco... jasondamisch (252)

CfV: S>F and F>S 5 42 (8/2/2012 4:51:41 PM) comp.lang.forth This is actually a poll about how widely the proposal is implemented and how popular it is among the programmers. It is called a CfV (call-for-votes) because the process is inspired by the Usenet Rdf/CfV pr... anton (5253)

Green Arrays presentation at Dark Silicon Workshop 23 43 (8/19/2012 12:44:02 AM) comp.lang.forth From June 2012 but I just found the slides. http://darksilicon.ucsd.edu/2012/assets/slides/5 Title: Illuminating Dark Silicon with a Fabric of Simple Computers Author: Charles H. Moore, Greg Bailey Gree... no.email6 (1518)

continue equivalent in Forth? 64 48 (8/19/2012 2:28:42 AM) comp.lang.forth When I am in a begin-while-repeat loop, I sometimes would like to go to the top of the loop. The "continue" keyword in C is what would help me perfectly here. Is there a "continue" like word in Forth? ... programmingkidx (18)

A simple SSA interpreter 8 31 (9/11/2012 10:22:41 PM) comp.lang.forth 0 [if] Based on the paper @inproceedings{vonRonne:2004:IPS:1059579.1059585, author = {von Ronne, Jeffery and Wang, Ning and Franz, Michael}, title = {Interpreting programs in static single assignment ... blog (1301)