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208 Commits

Author SHA1 Message Date
Nadav Rotem c1679a95b6 Add support for reduction variables that do not start at zero. 
This is important for nested-loop reductions such as :

In the innermost loop, the induction variable does not start with zero:

for (i = 0 .. n)
 for (j = 0 .. m)
  sum += ...

llvm-svn: 166387
 2012-10-21 05:52:51 +00:00
Nadav Rotem 7e1084d36c Vectorizer: fix a bug in the classification of induction/reduction phis. 
llvm-svn: 166384
 2012-10-21 02:38:01 +00:00
Nadav Rotem e5dc57d4fb Fix an infinite loop in the loop-vectorizer. 
PR14134.

llvm-svn: 166379
 2012-10-20 20:45:01 +00:00
Nadav Rotem d189b82a9b Vectorize: teach cavVectorizeMemory to distinguish between A[i]+=x and A[B[i]]+=x. 
If the pointer is consecutive then it is safe to read and write. If the pointer is non-loop-consecutive then
it is unsafe to vectorize it because we may hit an ordering issue.

llvm-svn: 166371
 2012-10-20 08:26:33 +00:00
Nadav Rotem 4f7f72702b Vectorizer: Add support for loop reductions. 
For example:

  for (i=0; i<n; i++)
   sum += A[i] +  B[i] + i;

llvm-svn: 166351
 2012-10-19 23:05:40 +00:00
Nadav Rotem ced93f3a05 vectorizer: Add support for reading and writing from the same memory location. 
llvm-svn: 166255
 2012-10-19 01:24:18 +00:00
Nadav Rotem b52f717411 Vectorizer: Add support for loops with an unknown count. For example: 
for (i=0; i<n; i++){
        a[i] = b[i+1] + c[i+3];
     }

llvm-svn: 166165
 2012-10-18 05:29:12 +00:00
Nadav Rotem 6b94c2a09b Add a loop vectorizer. 
llvm-svn: 166112
 2012-10-17 18:25:06 +00:00