Arnold Schwaighofer 07a3c481c6 LoopVectorizer: Extend the induction variable to a larger type ... In some case the loop exit count computation can overflow. Extend the type to prevent most of those cases. The problem is loops like: int main () { int a = 1; char b = 0; lbl: a &= 4; b--; if (b) goto lbl; return a; } The backedge count is 255. The induction variable type is i8. If we add one to 255 to get the exit count we overflow to zero. To work around this issue we extend the type of the induction variable to i32 in the case of i8 and i16. PR17532 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195008 91177308-0d34-0410-b5e6-96231b3b80d8		2013-11-18 13:14:32 +00:00
..
BBVectorize.cpp	Use more type helper functions	2013-10-21 19:43:56 +00:00
CMakeLists.txt	SLP Vectorizer: Implement multi-block slp-vectorization.	2013-06-22 21:34:10 +00:00
LLVMBuild.txt
LoopVectorize.cpp	LoopVectorizer: Extend the induction variable to a larger type	2013-11-18 13:14:32 +00:00
Makefile
SLPVectorizer.cpp	SLPVectorizer: Use properlyDominates to satisfy the irreflexivity of a strict weak ordering.	2013-11-04 21:34:55 +00:00
Vectorize.cpp	This patch breaks up Wrap.h so that it does not have to include all of	2013-05-01 20:59:00 +00:00