| Issue |
123970
|
| Summary |
RegAllocPBQP inaccessible
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Bob64375
|
Hi,
I am having difficulty getting llvm to use the RegAllocPBQP algorithm in 19.1.0, not that that's an issue in 19, I had the same difficulty in 15 before upgrading.
I have examined these ways to choose RegAllocPBQP:
1. "-regalloc={greedy,default,fast,basic}" does not support pbqp.
2. std::unique_ptr<llvm::legacy::FunctionPassManager> fpm;
fpm->add( llvm::createDefaultPBQPRegisterAllocator() );
Asserts with "Pass [llvm::SlotIndexesWrapperPass] is not initialized"
Some thoughts:
A. Is RegAllocPBQP deprecated and I shouldn't bother?
B. Am I unaware of another way besides legacy FunctionPassManager to add the PBQP allocator? - which it seems would also require disabling "-regalloc" since otherwise it would seem two different allocators would be requested.
C. No one's gotten around to integrating RegAllocPBQP into the "-regalloc" methodology?
Notes:
- Target is x64
- Other than trying PBQP is there an option to block spilling?
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