llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-06 04:31:08 +00:00

History

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
..
basic.ll	Allow loop-idiom to run on multiple BB loops, but still only scan the loop	2011-01-02 07:58:36 +00:00
dg.exp

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

basic.ll

Allow loop-idiom to run on multiple BB loops, but still only scan the loop

2011-01-02 07:58:36 +00:00

dg.exp