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23 Commits

Author SHA1 Message Date
Nadav Rotem
380fe201de Fix a bug in the vectorization of wide load/store operations. 
We used a SCEV to detect that A[X] is consecutive. We assumed that X was
the induction variable. But X can be any expression that uses the induction
for example: X = i + 2;

llvm-svn: 166388
 2012-10-21 06:49:10 +00:00
Nadav Rotem
825cda19d5 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
5ab04af30a Document change. Describe the pass and some papers that inspired the design of the pass. 
llvm-svn: 166386
 2012-10-21 04:04:25 +00:00
Nadav Rotem
763abacb83 Vectorizer: fix a bug in the classification of induction/reduction phis. 
llvm-svn: 166384
 2012-10-21 02:38:01 +00:00
Nadav Rotem
2ee8edf34a Fix an infinite loop in the loop-vectorizer. 
PR14134.

llvm-svn: 166379
 2012-10-20 20:45:01 +00:00
Nadav Rotem
cdd573e703 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
762317ecc6 Fix a typo 
llvm-svn: 166367
 2012-10-20 05:03:27 +00:00
Nadav Rotem
4e013454ca Vectorizer: refactor the memory checks to a new function. No functionality change. 
llvm-svn: 166366
 2012-10-20 04:59:06 +00:00
Nadav Rotem
61a5b018ad LoopVectorize: Keep the IRBuilder on the stack. 
llvm-svn: 166354
 2012-10-19 23:27:19 +00:00
Nadav Rotem
8fe03aa4c1 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
Benjamin Kramer
5080891e07 LoopVectorize: Keep the IRBuilder on the stack. 
No functionality change.

llvm-svn: 166274
 2012-10-19 08:42:02 +00:00
Nadav Rotem
451f76acc3 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
fe5d8c8c09 cleanup the comment. 
llvm-svn: 166247
 2012-10-18 23:21:01 +00:00
Nadav Rotem
ac2f32d807 fix a naming typo 
llvm-svn: 166232
 2012-10-18 21:45:31 +00:00
Nadav Rotem
b1d0bfd68b Avoid reconstructing the pointer set when searching for duplicated read/write pointers. 
llvm-svn: 166205
 2012-10-18 18:34:50 +00:00
Nadav Rotem
f1bbc20bb0 When looking for a vector representation of a scalar, do a single lookup. Also, cache the result of the broadcast instruction. 
No functionality change.

llvm-svn: 166191
 2012-10-18 17:31:49 +00:00
Nadav Rotem
76ff018e87 remove unused variable to fix a warning. 
llvm-svn: 166170
 2012-10-18 06:09:21 +00:00
Nadav Rotem
67e1c2c770 Remove the use of dominators and AA. 
llvm-svn: 166167
 2012-10-18 05:33:02 +00:00
Nadav Rotem
fd924ec3c6 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
NAKAMURA Takumi
8ffefaa778 LoopVectorize.cpp: Fix a warning. [-Wunused-variable] 
llvm-svn: 166153
 2012-10-17 23:40:15 +00:00
Jakub Staszak
f66a4adca8 Remove redundant SetInsertPoint call. 
llvm-svn: 166138
 2012-10-17 23:06:37 +00:00
Roman Divacky
e9f1f9a823 Fix some typos and wrong indenting. 
llvm-svn: 166128
 2012-10-17 21:07:35 +00:00
Nadav Rotem
8303c909c7 Add a loop vectorizer. 
llvm-svn: 166112
 2012-10-17 18:25:06 +00:00