llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-15 23:31:37 +00:00

History

Arnold Schwaighofer cbfa1ca993 LoopVectorize: Use the dependence test utility class

We now no longer need alias analysis - the cases that alias analysis would
handle are now handled as accesses with a large dependence distance.

We can now vectorize loops with simple constant dependence distances.

  for (i = 8; i < 256; ++i) {
    a[i] = a[i+4] * a[i+8];
  }

  for (i = 8; i < 256; ++i) {
    a[i] = a[i-4] * a[i-8];
  }

We would be able to vectorize about 200 more loops (in many cases the cost model
instructs us no to) in the test suite now. Results on x86-64 are a wash.

I have seen one degradation in ammp. Interestingly, the function in which we
now vectorize a loop is never executed so we probably see some instruction
cache effects. There is a 2% improvement in h264ref. There is one or the other
TSCV loop kernel that speeds up.

radar://13681598

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184685 91177308-0d34-0410-b5e6-96231b3b80d8

2013-06-24 03:55:48 +00:00

Analysis

Fix xemacs mode line, don't put them in .cpp files (just header files). No

2013-06-10 23:10:59 +00:00

AsmParser

Add a new function attribute 'cold' to functions.

2013-05-24 12:26:52 +00:00

Bitcode

Remove the Copied parameter from MemoryObject::readBytes.

2013-05-24 10:54:58 +00:00

CodeGen

Fix tail merging to assign the (more) correct BasicBlock when splitting.