http://llvm.org/bugs/show_bug.cgi?id=2206
Summary: The bitwise-instruction optimizer doesn't know about
alignment of globals.
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Consider "i64 and (i64 ptrtoint (i64 (i64)* @cons to i64), i64 -8)"[1].
(Where @cons is a global function with an alignment >= 8 specified)
Such expressions aren't simplified by "opt -std-compile-opts", even though the
relevant bits of the ptrtoint result are guaranteed to be zero because of
above-mentioned alignment and similar optimizations are performed if the
pointer is replaced by an integer.
[1]: That expression was shortened for readability, and not actually tested in
this form. The actual expression was "i64 inttoptr (i64 and (i64 or (i64
ptrtoint (i64 (i64)* @cons to i64), i64 1), i64 -8) to i64 (i64)*)".
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