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cmd/compile: fix stack growing algorithm

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The current stack growing implementation looks not right.
Specially, the line runtime/stack.go#L1068 never gets executed,
which causes many unnecessary copystack calls.

This PR is trying to correct the implementation.
As I'm not familiar with the code, the fix is just a guess.

Change-Id: I0bea1148175fad34f74f19d455c240c94d3cb78b
GitHub-Last-Rev: 57205f91fe
GitHub-Pull-Request: golang/go#47010
Reviewed-on: https://go-review.googlesource.com/c/go/+/332229
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
go101 2021-07-02 08:01:20 +00:00 committed by Keith Randall
parent 743f03eeb0
commit 287c5e8066
1 changed files with 3 additions and 1 deletions
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4
src/runtime/stack.go
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@ -1064,7 +1064,9 @@ func newstack() {
// recheck the bounds on return.)
if f := findfunc(gp.sched.pc); f.valid() {
max := uintptr(funcMaxSPDelta(f))
for newsize-gp.sched.sp < max+_StackGuard {
needed := max + _StackGuard
used := gp.stack.hi - gp.sched.sp
for newsize-used < needed {
newsize *= 2
}
}