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runtime: simplify code

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The %61 hack was added when runtime was is in C.
Now the Go compiler does the optimization.

Change-Id: I79c3302ec4b931eaaaaffe75e7101c92bf287fc7
Reviewed-on: https://go-review.googlesource.com/3289
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Dmitry Vyukov 2015-01-27 22:55:03 +03:00
parent a66aa77c2d
commit 6d37c830b6
1 changed files with 1 additions and 4 deletions
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5
src/runtime/proc1.go
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@ -1429,10 +1429,7 @@ top:
// Check the global runnable queue once in a while to ensure fairness.
// Otherwise two goroutines can completely occupy the local runqueue
// by constantly respawning each other.
tick := _g_.m.p.schedtick
// This is a fancy way to say tick%61==0,
// it uses 2 MUL instructions instead of a single DIV and so is faster on modern processors.
if uint64(tick)-((uint64(tick)*0x4325c53f)>>36)*61 == 0 && sched.runqsize > 0 {
if _g_.m.p.schedtick%61 == 0 && sched.runqsize > 0 {
lock(&sched.lock)
gp = globrunqget(_g_.m.p, 1)
unlock(&sched.lock)