Eelco Dolstra 198d0338be Add a primop ‘concatLists’ ... This can serve as a generic efficient list builder. For instance, the function ‘catAttrs’ in Nixpkgs can be rewritten from attr: l: fold (s: l: if hasAttr attr s then [(getAttr attr s)] ++ l else l) [] l to attr: l: builtins.concatLists (map (s: if hasAttr attr s then [(getAttr attr s)] else []) l) Statistics before: time elapsed: 1.08683 size of a value: 24 environments allocated: 1384376 (35809568 bytes) list elements: 6946783 (55574264 bytes) list concatenations: 37434 values allocated: 1760440 (42250560 bytes) attribute sets allocated: 392040 right-biased unions: 186334 values copied in right-biased unions: 591137 symbols in symbol table: 18273 number of thunks: 1297673 number of thunks avoided: 1380759 number of attr lookups: 430802 number of primop calls: 628912 number of function calls: 1333544 Statistics after (including new catAttrs): time elapsed: 0.959854 size of a value: 24 environments allocated: 1010198 (26829296 bytes) list elements: 1984878 (15879024 bytes) list concatenations: 30488 values allocated: 1589760 (38154240 bytes) attribute sets allocated: 392040 right-biased unions: 186334 values copied in right-biased unions: 591137 symbols in symbol table: 18274 number of thunks: 1040925 number of thunks avoided: 1038428 number of attr lookups: 438419 number of primop calls: 474844 number of function calls: 959366		2012-08-13 01:53:10 -04:00
..
bin2c	* Sync with the trunk.	2010-04-20 09:20:29 +00:00
boost	* Install some headers in the right location.	2009-03-05 14:57:50 +00:00
bsdiff-4.3	Drop the externals directory	2012-03-18 23:54:57 +01:00
libexpr	Add a primop ‘concatLists’	2012-08-13 01:53:10 -04:00
libmain	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
libstore	Don't warn about maximum link count exceeded on 0-byte files	2012-08-07 16:22:54 -04:00
libutil	Add some basic profiling support to the evaluator	2012-08-12 23:29:28 -04:00
nix-env	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
nix-hash	* Move parseHash16or32 into libutil, and use in nix-hash.	2011-12-02 11:47:06 +00:00
nix-instantiate	nix-instantiate: default to "default.nix" if no arguments are given	2012-04-17 17:19:43 +02:00
nix-log2xml	* Emit warning='1' or error='1' attributes for lines marked as	2010-03-05 12:54:58 +00:00
nix-setuid-helper	* Drop the dependency on the ATerm library.	2010-04-19 14:51:58 +00:00
nix-store	Drop the block count in the garbage collector	2012-08-01 22:34:46 -04:00
nix-worker	Drop the block count in the garbage collector	2012-08-01 22:34:46 -04:00
Makefile.am	* Drop the dependency on the ATerm library.	2010-04-19 14:51:58 +00:00