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runtime: make {add,subtract}{b,1} nosplit

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These are used at the bottom level of various GC operations that must
not be preempted. To be on the safe side, mark them all nosplit.

Change-Id: I8f7360e79c9852bd044df71413b8581ad764380c
Reviewed-on: https://go-review.googlesource.com/22504
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2016-04-27 14:30:01 -04:00
parent bddfc337f9
commit 30172f1811
1 changed files with 3 additions and 0 deletions
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3
src/runtime/mbitmap.go
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@ -86,6 +86,7 @@ const (
// addb returns the byte pointer p+n. // addb returns the byte pointer p+n.
//go:nowritebarrier //go:nowritebarrier
//go:nosplit
func addb(p *byte, n uintptr) *byte { func addb(p *byte, n uintptr) *byte {
// Note: wrote out full expression instead of calling add(p, n) // Note: wrote out full expression instead of calling add(p, n)
// to reduce the number of temporaries generated by the // to reduce the number of temporaries generated by the
@ -95,6 +96,7 @@ func addb(p *byte, n uintptr) *byte {
// subtractb returns the byte pointer p-n. // subtractb returns the byte pointer p-n.
//go:nowritebarrier //go:nowritebarrier
//go:nosplit
func subtractb(p *byte, n uintptr) *byte { func subtractb(p *byte, n uintptr) *byte {
// Note: wrote out full expression instead of calling add(p, -n) // Note: wrote out full expression instead of calling add(p, -n)
// to reduce the number of temporaries generated by the // to reduce the number of temporaries generated by the
@ -104,6 +106,7 @@ func subtractb(p *byte, n uintptr) *byte {
// add1 returns the byte pointer p+1. // add1 returns the byte pointer p+1.
//go:nowritebarrier //go:nowritebarrier
//go:nosplit
func add1(p *byte) *byte { func add1(p *byte) *byte {
// Note: wrote out full expression instead of calling addb(p, 1) // Note: wrote out full expression instead of calling addb(p, 1)
// to reduce the number of temporaries generated by the // to reduce the number of temporaries generated by the