http://llvm.org/bugs/show_bug.cgi?id=2546
Summary: create SCEVInfinite
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: Loop Optimizer
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Currently we use SCEVCouldNotCompute for cases where the analysis failed and
when the loop was successfully analyzed as being infinite. We should split
those apart and return a new SCEVInfinite type for loops that are provable
infinite.
Internally, a SCEVInfinite early on should skip the brute force loop count
computation. Once we're no longer wasting time brute forcing infinite loops, we
can try cranking up the number of brute force iterations.
Also, some passes, like loop deletion, might want to see SCEVInfinite.
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