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cmd/compile/internal/inline: refactor inline budget computation

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Split out the code that computes the initial inline "hairyness" budget
for a function so that it can be reused (in a later patch). This is a
pure refactoring; no change in compiler functionality.

Change-Id: I9b1b7b10a7c480559b837492b10eb08771b7a145
Reviewed-on: https://go-review.googlesource.com/c/go/+/514795
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Than McIntosh 2023-07-31 15:26:26 -04:00
parent 7087b8ac4c
commit 6eb31c1a00
1 changed files with 22 additions and 12 deletions
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34
src/cmd/compile/internal/inline/inl.go
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@ -266,6 +266,26 @@ func garbageCollectUnreferencedHiddenClosures() {
}
}
// inlineBudget determines the max budget for function 'fn' prior to
// analyzing the hairyness of the body of 'fn'. We pass in the pgo
// profile if available, which can change the budget. If 'verbose' is
// set, then print a remark where we boost the budget due to PGO.
func inlineBudget(fn *ir.Func, profile *pgo.Profile, verbose bool) int32 {
// Update the budget for profile-guided inlining.
budget := int32(inlineMaxBudget)
if profile != nil {
if n, ok := profile.WeightedCG.IRNodes[ir.LinkFuncName(fn)]; ok {
if _, ok := candHotCalleeMap[n]; ok {
budget = int32(inlineHotMaxBudget)
if verbose {
fmt.Printf("hot-node enabled increased budget=%v for func=%v\n", budget, ir.PkgFuncName(fn))
}
}
}
}
return budget
}
// CanInline determines whether fn is inlineable.
// If so, CanInline saves copies of fn.Body and fn.Dcl in fn.Inl.
// fn and fn.Body will already have been typechecked.
@ -311,18 +331,8 @@ func CanInline(fn *ir.Func, profile *pgo.Profile) {
cc = 1 // this appears to yield better performance than 0.
}
// Update the budget for profile-guided inlining.
budget := int32(inlineMaxBudget)
if profile != nil {
if n, ok := profile.WeightedCG.IRNodes[ir.LinkFuncName(fn)]; ok {
if _, ok := candHotCalleeMap[n]; ok {
budget = int32(inlineHotMaxBudget)
if base.Debug.PGODebug > 0 {
fmt.Printf("hot-node enabled increased budget=%v for func=%v\n", budget, ir.PkgFuncName(fn))
}
}
}
}
// Compute the inline budget for this function.
budget := inlineBudget(fn, profile, base.Debug.PGODebug > 0)
// At this point in the game the function we're looking at may
// have "stale" autos, vars that still appear in the Dcl list, but