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Chris Lattner cf078f2b20 Allow loop-idiom to run on multiple BB loops, but still only scan the loop 
header for now for memset/memcpy opportunities.  It turns out that loop-rotate
is successfully rotating loops, but *DOESN'T MERGE THE BLOCKS*, turning "for 
loops" into 2 basic block loops that loop-idiom was ignoring.

With this fix, we form many *many* more memcpy and memsets than before, including
on the "history" loops in the viterbi benchmark, which look like this:

        for (j=0; j<MAX_history; ++j) {
          history_new[i][j+1] = history[2*i][j];
        }

Transforming these loops into memcpy's speeds up the viterbi benchmark from
11.98s to 3.55s on my machine.  Woo.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122685 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-02 07:58:36 +00:00
..
Analysis Revert commit 122654 at the request of Chris, who reckons that instsimplify 2011-01-01 20:08:02 +00:00
Archive MemoryBuffer now return an error_code and returns a OwningPtr<MemoryBuffer> via an out parm. 2010-12-16 03:29:14 +00:00
AsmParser Add missing standard headers. Patch by Joerg Sonnenberger! 2010-12-19 20:43:38 +00:00
Bitcode Add missing standard headers. Patch by Joerg Sonnenberger! 2010-12-19 20:43:38 +00:00
CodeGen Use getVRegDef() instead of def_iterator. This leads to fewer defs being added 2010-12-30 00:42:23 +00:00
CompilerDriver Support/PathV1: Deprecate get{Basename,Dirname,Suffix}. 2010-12-18 22:23:07 +00:00
ExecutionEngine Remove unneeded zero arrays. 2010-12-04 15:28:22 +00:00
Linker include the module identifier when emitting this warning, PR8865. 2010-12-30 02:49:45 +00:00
MC Fix PR8878. 2011-01-01 19:05:35 +00:00
Object Fix mismatched new[]/delete. 2010-12-17 09:56:50 +00:00
Support Fix a signed/unsigned comparison warning. 2010-12-28 13:05:13 +00:00
Target Allow loop-idiom to run on multiple BB loops, but still only scan the loop 2011-01-02 07:58:36 +00:00
Transforms Allow loop-idiom to run on multiple BB loops, but still only scan the loop 2011-01-02 07:58:36 +00:00
VMCore fix PR8867: a crash handling fp128. Thanks to Nick for the testcase. 2010-12-29 01:33:36 +00:00
Makefile Add LLVMObject Library. 2010-11-15 03:21:41 +00:00