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29 Commits

Author SHA1 Message Date
Nadav Rotem f17cd27362 Rename a variable. 
llvm-svn: 166410
 2012-10-22 04:53:05 +00:00
Nadav Rotem 03011f1393 Vectorizer: optimize the generation of selects. If the condition is uniform, generate a scalar-cond select (i1 as selector). 
llvm-svn: 166409
 2012-10-22 04:38:00 +00:00
Nadav Rotem c9741887c3 Update the loop vectorizer docs. 
llvm-svn: 166408
 2012-10-22 03:52:53 +00:00
Anders Carlsson 7d8991c778 Avoid an extra hash lookup when inserting a value into the widen map. 
llvm-svn: 166395
 2012-10-21 16:26:35 +00:00
Jakub Staszak baa063bd03 Simplify code. No functionality change. 
llvm-svn: 166393
 2012-10-21 15:36:03 +00:00
Jakub Staszak 9694ab8ffa Simplify code. No functionality change. 
llvm-svn: 166392
 2012-10-21 15:29:19 +00:00
Nadav Rotem fe88c67161 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 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 364bd30641 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 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 3940bafb54 Fix a typo 
llvm-svn: 166367
 2012-10-20 05:03:27 +00:00
Nadav Rotem f70ca3ceed 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 550f7f7e19 LoopVectorize: Keep the IRBuilder on the stack. 
llvm-svn: 166354
 2012-10-19 23:27:19 +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
Benjamin Kramer 319cb771b2 LoopVectorize: Keep the IRBuilder on the stack. 
No functionality change.

llvm-svn: 166274
 2012-10-19 08:42:02 +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 1667324f22 cleanup the comment. 
llvm-svn: 166247
 2012-10-18 23:21:01 +00:00
Nadav Rotem d45a6b93df fix a naming typo 
llvm-svn: 166232
 2012-10-18 21:45:31 +00:00
Nadav Rotem f8a1396882 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 a031c57417 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 7a1728094c remove unused variable to fix a warning. 
llvm-svn: 166170
 2012-10-18 06:09:21 +00:00
Nadav Rotem 642efbcdd8 Remove the use of dominators and AA. 
llvm-svn: 166167
 2012-10-18 05:33:02 +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
NAKAMURA Takumi 7857415785 LoopVectorize.cpp: Fix a warning. [-Wunused-variable] 
llvm-svn: 166153
 2012-10-17 23:40:15 +00:00
Jakub Staszak 68e5dfddcb Remove redundant SetInsertPoint call. 
llvm-svn: 166138
 2012-10-17 23:06:37 +00:00
Roman Divacky 4955ec317c Fix some typos and wrong indenting. 
llvm-svn: 166128
 2012-10-17 21:07:35 +00:00
Nadav Rotem 6b94c2a09b Add a loop vectorizer. 
llvm-svn: 166112
 2012-10-17 18:25:06 +00:00