llvm-project/llvm/test/Transforms/SampleProfile/Inputs/inline-topdown.prof

main:225715:0
 2.1: 5553
 3: 5391
 3.1: _Z3sumii:50000
  1: _Z3subii:0
   1: 0

_Z3sumii:6010:50000
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   1: 9
[AutoFDO] Top-down Inlining for specialization with context-sensitive profile Summary: AutoFDO's sample profile loader processes function in arbitrary source code order, so if I change the order of two functions in source code, the inline decision can change. This also prevented the use of context-sensitive profile to do specialization while inlining. This commit enforces SCC top-down order for sample profile loader. With this change, we can now do specialization, as illustrated by the added test case: Say if we have A->B->C and D->B->C call path, we want to inline C into B when root inliner is B, but not when root inliner is A or D, this is not possible without enforcing top-down order. E.g. Once C is inlined into B, A and D can only choose to inline (B->C) as a whole or nothing, but what we want is only inline B into A and D, not its recursive callee C. If we process functions in top-down order, this is no longer a problem, which is what this commit is doing. This change is guarded with a new switch "-sample-profile-top-down-load" for tuning, and it depends on D70653. Eventually, top-down can be the default order for sample profile loader. Reviewers: wmi, davidxl Subscribers: hiraditya, llvm-commits, tejohnson Tags: #llvm Differential Revision: https://reviews.llvm.org/D70655 2019-11-25 15:54:07 +08:00			`main:225715:0`
			`2.1: 5553`
			`3: 5391`
			`3.1: _Z3sumii:50000`
			`1: _Z3subii:0`
			`1: 0`

			`_Z3sumii:6010:50000`
			`1: _Z3subii:60000`
			`1: 9`