http://llvm.org/bugs/show_bug.cgi?id=5282
Summary: indvars creates wild GEP from tame GEP
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]
Here's the GEP before running "opt -indvars" on the attached testcase:
%19 = getelementptr inbounds [2147483647 x i32]* %table.11_41, i32 0, i32 %18
; <i32*> [#uses=1]
And here it is afterwards:
%scevgep = getelementptr [2147483647 x i32]* %table.11_41, i32 %tmp, i32 0 ;
<i32*> [#uses=1]
Note how before the transform we were advancing in units of 4 bytes (i32),
but afterwards we are advancing in units of 8589934588 bytes ([2147483647 x
i32]).
This crashes the codegenerators, but besides that it seems like a generally
unfortunate thing to do. Note how the GEP also lost the inbounds flag.
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