[PATCH] D117364: AMDGPU: Use module level register maximums for unknown callees

[Sebastian Neubauer via Phabricator via llvm-commits]

sebastian-ne requested changes to this revision.
sebastian-ne added inline comments.
This revision now requires changes to proceed.


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Comment at: llvm/test/CodeGen/AMDGPU/amdpal-callable.ll:184
 ; GCN-NEXT:        .stack_frame_size_in_bytes: 0x10{{$}}
-; GCN-NEXT:        .vgpr_count:     0x29{{$}}
+; GCN-NEXT:        .vgpr_count:     0x40{{$}}
 ; GCN-NEXT:      no_stack_extern_call_many_args:
----------------
This is over-approximating the vgpr_count whenever an indirect call is involved, which is quite a performance hit.

Can we switch AMDGPUResourceUsageAnalysis to a ModulePass and run `propagateIndirectCallRegisterUsage` at the end, so that all functions with indirect calls will get the maximum VGPR count of all functions in the module?
(As opposed to max VGPR count of the SCC that is used currently, which I did not intend.)


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  https://reviews.llvm.org/D117364/new/

https://reviews.llvm.org/D117364