http://llvm.org/bugs/show_bug.cgi?id=8891
Summary: Early phases of backend recompute dominators too often
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Machine Module Information
ModulePass Manager
FunctionPass Manager
Preliminary module verification
Dominator Tree Construction
Module Verifier
Natural Loop Information
Loop Pass Manager
Canonicalize natural loops
Scalar Evolution Analysis
Loop Pass Manager
Induction Variable Users
Canonicalize natural loops
Induction Variable Users
Loop Strength Reduction
Lower Garbage Collection Instructions
Remove unreachable blocks from the CFG
Dominator Tree Construction <--- Here
Exception handling preparation
Optimize for code generation
Insert stack protectors
Preliminary module verification
Dominator Tree Construction <--- Here
Module Verifier
The last dominator tree computation should be easy to get rid of, since
DwarfEHPrepare already preserves dominators, CodeGenPrepare only messes with
blocks that have a single successor, and StackProtector only needs to be
concerned with the two blocks that it adds (which both have the same idom).
The one before it might not be so easy, but "UnreachableBlockElim" is entirely
dominator based, so it won't be the problem.
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