http://llvm.org/bugs/show_bug.cgi?id=17963
Bug ID: 17963
Summary: SCEV dropping NSW/NUW flags on non-unit stride access
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 11556
--> http://llvm.org/bugs/attachment.cgi?id=11556&action=edit
example in C and IR
The attached C code, compiled with Clang to the attached IR has a
multiplicative factor of 2, and SCEV::getMulExpr() is losing the NSW that is on
the multiplication for being too conservative.
Keeping the NSW flags will help the non-unit stride analysis on the vectorizer.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
