[llvm-commits] CVS: llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

[Chris Lattner]

Changes in directory llvm/lib/Transforms/Scalar:

LoopStrengthReduce.cpp updated: 1.124 -> 1.125
---
Log message:

allow -1 strides to reuse "1" strides.


---
Diffs of the changes:  (+2 -1)

 LoopStrengthReduce.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)


Index: llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
diff -u llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp:1.124 llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp:1.125
--- llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp:1.124	Mon Apr  2 01:34:44 2007
+++ llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp	Mon Apr  2 17:51:58 2007
@@ -929,7 +929,8 @@
     for (std::map<SCEVHandle, IVsOfOneStride>::iterator SI= IVsByStride.begin(),
            SE = IVsByStride.end(); SI != SE; ++SI) {
       int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
-      if (unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0)
+      if (SInt != -SSInt &&
+          (unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0))
         continue;
       int64_t Scale = SInt / SSInt;
       // Check that this stride is valid for all the types used for loads and