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cmd/compile/internal/gc: update comment after c2go 

Change-Id: I02c60f6c767e917a8ed3772c2773fe266f781e44
Reviewed-on: https://go-review.googlesource.com/19834
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Shenghou Ma 2016-02-23 19:20:41 -05:00 committed by Minux Ma
parent 733cae6acd
commit 7606e4a032
1 changed files with 12 additions and 12 deletions
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24
src/cmd/compile/internal/gc/popt.go
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@ -218,22 +218,22 @@ func fixjmp(firstp *obj.Prog) {
// Control flow analysis. The Flow structures hold predecessor and successor
// information as well as basic loop analysis.
//
// graph = flowstart(firstp, 0);
// graph = Flowstart(firstp, nil)
// ... use flow graph ...
// flowend(graph); // free graph
// Flowend(graph) // free graph
//
// Typical uses of the flow graph are to iterate over all the flow-relevant instructions:
//
// for(f = graph->start; f != nil; f = f->link)
// for f := graph.Start; f != nil; f = f.Link {}
//
// or, given an instruction f, to iterate over all the predecessors, which is
// f->p1 and this list:
// f.P1 and this list:
//
// for(f2 = f->p2; f2 != nil; f2 = f2->p2link)
// for f2 := f.P2; f2 != nil; f2 = f2.P2link {}
//
// The size argument to flowstart specifies an amount of zeroed memory
// to allocate in every f->data field, for use by the client.
// If size == 0, f->data will be nil.
// The second argument (newData) to Flowstart specifies a func to create object
// for every f.Data field, for use by the client.
// If newData is nil, f.Data will be nil.
var flowmark int
@ -472,8 +472,8 @@ func flowrpo(g *Graph) {
me = r1.Rpo
d = -1
// rpo2r[r->rpo] == r protects against considering dead code,
// which has r->rpo == 0.
// rpo2r[r.Rpo] == r protects against considering dead code,
// which has r.Rpo == 0.
if r1.P1 != nil && rpo2r[r1.P1.Rpo] == r1.P1 && r1.P1.Rpo < me {
d = r1.P1.Rpo
}
@ -685,7 +685,7 @@ func mergetemp(firstp *obj.Prog) {
// Traverse live range of each variable to set start, end.
// Each flood uses a new value of gen so that we don't have
// to clear all the r->active words after each variable.
// to clear all the r.Active words after each variable.
gen := uint32(0)
for _, v := range vars {
@ -911,7 +911,7 @@ func varkillwalk(v *TempVar, f0 *Flow, gen uint32) {
// from memory without being rechecked. Other variables need to be checked on
// each load.
var killed int // f->data is either nil or &killed
var killed int // f.Data is either nil or &killed
func nilopt(firstp *obj.Prog) {
g := Flowstart(firstp, nil)