[PATCH] [PBQP] Teach PassConfig to tell if the default register allocator is used

[Arnaud De Grandmaison]

Answering to myself there: the part of the patch affecting TargetPassConfig can be simplified to something innocuous. I thus updated the patch and went for post-commit review with r220321.

From: llvm-commits-bounces at cs.uiuc.edu [mailto:llvm-commits-bounces at cs.uiuc.edu] On Behalf Of Arnaud A. de Grandmaison
Sent: 21 October 2014 19:10
To: llvm-commits at cs.uiuc.edu; 'Lang Hames'
Subject: [PATCH] [PBQP] Teach PassConfig to tell if the default register allocator is used

This enables targets to adapt their pass pipeline to the register allocator in use.

For example, with the AArch64 backend, when using PBQP with cortex-a57, the FPLoadBalancing pass is no longer necessary.

This patch addresses the last bits of the changes made by Lang Hames on improving how targets can provide their own constraint builders @r219421, and provides a generic way which can be used by other backends.

This is not as flexible as I would like it to be, as it can only tell if the default allocator was superseded on the command line (we do not know which one was actually selected), but this is simple enough for now and I doubt many people are playing with more than 2 allocators at the same time...

Cheers,
--
Arnaud A. de Grandmaison


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