[Simplify] Rewrite redundant write detection algorithm.

The previous algorithm was to search a writes and the sours of its value
operand, and see whether the write just stores the same read value back,
which includes a search whether there is another write access between
them. This is O(n^2) in the max number of accesses in a statement
(+ the complexity of isl comparing the access functions).

The new algorithm is more similar to the one used for searching for
overwrites and coalescable writes. It scans over all accesses in order
of execution while tracking which array elements still have the same
value since it was read. This is O(n), not counting the complexity
within isl. It should be more reliable than trying to catch all
non-conforming cases in the previous approach. It is also less code.

We now also support if the write is a partial write of the read's
domain, and to some extent non-affine subregions.

Differential Revision: https://reviews.llvm.org/D36137

llvm-svn: 309734

1 files changed, 0 insertions, 4 deletions

diff --git a/polly/test/Simplify/redundant_differentindex.ll b/polly/test/Simplify/redundant_differentindex.ll
index d460f85a09d..3a5e07334cb 100644
--- a/polly/test/Simplify/redundant_differentindex.ll
+++ b/polly/test/Simplify/redundant_differentindex.ll
@@ -1,6 +1,4 @@
 ; RUN: opt %loadPolly -polly-simplify -analyze < %s | FileCheck %s -match-full-lines
-; RUN: opt %loadPolly -polly-simplify -disable-output -stats < %s 2>&1 | FileCheck %s --check-prefix=STATS -match-full-lines
-; REQUIRES: asserts
 ;
 ; A store that has a different index than the load it is storing is
 ; not redundant.
@@ -36,5 +34,3 @@ return:
 
 
 ; CHECK: SCoP could not be simplified
-
-; STATS: 1 polly-simplify   - Number of Load-Store pairs NOT removed because of different access relations