6 Commits

Author	SHA1	Message	Date
Duraid Madina	39fcec1541	* OK, after changing to use liveIn/liveOut instead of IDEFs, ... to avoid redundant mov out3=r44 type instructions, we need to tell the register allocator the truth about out? registers. FIXME: unfortunately, since the list of allocatable registers is immutable, we can't simply 'delete r127' from the allocation order, say, if 'out0' is used. The only correct thing we can do is have a linear order of regs: out7, out6 ... out2, out1, out0, r32, r33, r34 ... r126, r127 and slide a 'window' of 96 registers along this line, depending on how many of the out? regs a function actually uses. The only downside of this is that the out? registers will be allocated _first_, which makes the resulting assembly ugly. :( Note this in the README. Hope this gets fixed soon. :) (note the 3rd person speech there) llvm-svn: 21252	2005-04-12 18:42:59 +00:00
Chris Lattner	be2dceff48	Put out* into the allocation order, allowing the register allocator to ... coallesce moves into outgoing args. llvm-svn: 21249	2005-04-12 15:12:51 +00:00
Duraid Madina	2821f99f19	stop emitting IDEFs for args - change to using liveIn/liveOut ... llvm-svn: 21247	2005-04-12 14:54:44 +00:00
Duraid Madina	2d3e52576d	ok, the "ia64 has a boatload of registers" joke stopped being funny today ;) ... * fix overallocation of integer (stacked) registers: we can't allocate registers for local use if they are required as output registers this fixes 'toast' in the test suite, and all sorts of larger programs like bzip2 etc. llvm-svn: 21178	2005-04-09 11:53:00 +00:00
Duraid Madina	62c4de8d62	make sure 'special' registers don't get allocated ... llvm-svn: 21109	2005-04-06 06:17:54 +00:00
Duraid Madina	79022e1b87	and so it begins... ... PHASE 1: write instruction selector PHASE 2: ??? PHASE 3: profit! llvm-svn: 20652	2005-03-17 18:17:03 +00:00