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cmd/gc: Don't calculate second value in range if it is blank.

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Low hanging fruit optimization. Will remove an expensive copy if the range variable is an array.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6564052
This commit is contained in:
Daniel Morsing 2012-09-26 21:10:29 +02:00
parent cca48f1a57
commit 7936ab58f7
1 changed files with 5 additions and 0 deletions
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5
src/cmd/gc/range.c
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@ -71,6 +71,11 @@ typecheckrange(Node *n)
v2 = N;
if(n->list->next)
v2 = n->list->next->n;
if(isblank(v2)) {
n->list = list1(v1);
v2 = N;
}
if(v1->defn == n)
v1->type = t1;