http://llvm.org/bugs/show_bug.cgi?id=22065
Bug ID: 22065
Summary: Optimize 0>=p-q to q >= p for char*p,*q;
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
It was noticed that Boost's iterator_facade incurred a performance penalty
(while it should ideally be zero-overhead), which results from the fact that
Clang does not optimize 0>=p-q to q>=p for char*p,*q;. See attachment.
Chandler was reported as saying it's a case of a missing InstCombine rule.
This probably applies to > and < and <= as well.
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