Chris Lattner e41d3c015c Teach loop-idiom to turn a loop containing a memset into a larger memset ...

when safe.

The testcase is basically this nested loop:
void foo(char *X) {
  for (int i = 0; i != 100; ++i) 
    for (int j = 0; j != 100; ++j)
      X[j+i*100] = 0;
}

which gets turned into a single memset now.  clang -O3 doesn't optimize
this yet though due to a phase ordering issue I haven't analyzed yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122806 91177308-0d34-0410-b5e6-96231b3b80d8

2011-01-04 07:46:33 +00:00

..

basic.ll

Teach loop-idiom to turn a loop containing a memset into a larger memset

2011-01-04 07:46:33 +00:00

dg.exp

implement enough of the memset inference algorithm to recognize and insert

2010-12-26 23:42:51 +00:00