http://llvm.org/bugs/show_bug.cgi?id=11181
Summary: suboptimal code generation in strlen constant folding
Product: new-bugs
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
target datalayout =
"e-p:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-f80:32:32-v64:64:64-v128:128:128-a0:0:64"
declare i32 @strlen(i8* noalias nocapture) nounwind readonly
@nullstring = internal constant i8 0
define i32 @main() {
%len = tail call i32 @strlen(i8* @nullstring) nounwind
ret i32 %len
}
strlen does not seem to look at the data behind @nullstring when it does not
have a specific format
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