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cmd/compile: update bottomUpVisitor.visit comments 

Change-Id: I83a62b15c5946cfe61afc53c2c528aa3a62f815e
Reviewed-on: https://go-review.googlesource.com/c/go/+/429975
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
This commit is contained in:
Cuong Manh Le 2022-09-10 02:36:59 +07:00 committed by Gopher Robot
parent 65deb9c3ce
commit 7ed6073da0
1 changed files with 6 additions and 9 deletions
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15
src/cmd/compile/internal/ir/scc.go
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@ -103,16 +103,13 @@ func (v *bottomUpVisitor) visit(n *Func) uint32 {
if (min == id || min == id+1) && !n.IsHiddenClosure() {
// This node is the root of a strongly connected component.
// The original min passed to visitcodelist was v.nodeID[n]+1.
// If visitcodelist found its way back to v.nodeID[n], then this
// block is a set of mutually recursive functions.
// Otherwise it's just a lone function that does not recurse.
// The original min was id+1. If the bottomUpVisitor found its way
// back to id, then this block is a set of mutually recursive functions.
// Otherwise, it's just a lone function that does not recurse.
recursive := min == id
// Remove connected component from stack.
// Mark walkgen so that future visits return a large number
// so as not to affect the caller's min.
// Remove connected component from stack and mark v.nodeID so that future
// visits return a large number, which will not affect the caller's min.
var i int
for i = len(v.stack) - 1; i >= 0; i-- {
x := v.stack[i]
@ -122,7 +119,7 @@ func (v *bottomUpVisitor) visit(n *Func) uint32 {
}
}
block := v.stack[i:]
// Run escape analysis on this set of functions.
// Call analyze on this set of functions.
v.stack = v.stack[:i]
v.analyze(block, recursive)
}