Chris Lattner 87f1ce9b96 This changes the PromoteMemToReg function to create "pruned" SSA form, not ... "minimal" SSA form (in other words, it doesn't insert dead PHIs). This speeds up the mem2reg pass very significantly because it doesn't have to do a lot of frivolous work in many common cases. In the 252.eon function I have been playing with, this doesn't even insert the 120 PHI nodes that it used to which were trivially dead (in the process of promoting 356 alloca instructions overall). This speeds up the mem2reg pass from 1.2459s to 0.1284s. More significantly, the DCE pass used to take 2.4138s to remove the 120 dead PHI nodes that mem2reg constructed, now it takes 0.0134s (which is the time to scan the function and decide that there is nothing dead). So overall, on this one function, we speed things up a total of 3.5179s, which is a 24.8x speedup! :) This change is tested by the Mem2Reg/2003-10-05-DeadPHIInsertion.ll test, which now passes. llvm-svn: 8884		2003-10-05 22:19:20 +00:00
..
Hello	Initial checkin of the "Hello World" Pass.	2002-08-08 20:10:38 +00:00
Instrumentation	Use global *_iterator	2003-09-24 22:07:33 +00:00
IPO	Credits are now in top-level CREDITS.TXT	2003-09-22 21:57:15 +00:00
Scalar	Change the interface to PromoteMemToReg to also take a DominatorTree	2003-10-05 21:20:13 +00:00
Utils	This changes the PromoteMemToReg function to create "pruned" SSA form, not	2003-10-05 22:19:20 +00:00
ExprTypeConvert.cpp	Spell `necessary' correctly.	2003-08-18 14:43:39 +00:00
LevelRaise.cpp	Prototype for creator function got moved	2003-09-01 20:45:33 +00:00
Makefile	Convert DIRS to PARALLEL_DIRS. They can be built independently.	2002-09-29 11:52:14 +00:00
TransformInternals.cpp	avoid dividing by zero when dealing with zero sized types (like [0 x double])	2003-06-23 17:36:49 +00:00
TransformInternals.h	The word dependent' has no a'.	2003-08-21 22:14:26 +00:00