cmd/internal/gc: clean up liveness code
- use Bvec, not *Bvec, and bulk allocate backing store
- use range loops
- put Bvecs in BasicBlock struct instead of indexing into parallel slices
Change-Id: I5cb30f50dccb4d38cc18fae422f7f132c52876be
Reviewed-on: https://go-review.googlesource.com/6602
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/src/cmd/internal/gc/walk.go b/src/cmd/internal/gc/walk.go
index 0992c18..1439644 100644
--- a/src/cmd/internal/gc/walk.go
+++ b/src/cmd/internal/gc/walk.go
@@ -2196,7 +2196,7 @@
// TODO(rsc): Perhaps componentgen should run before this.
-var applywritebarrier_bv *Bvec
+var applywritebarrier_bv Bvec
func applywritebarrier(n *Node, init **NodeList) *Node {
if n.Left != nil && n.Right != nil && needwritebarrier(n.Left, n.Right) {
@@ -2216,7 +2216,7 @@
n = mkcall1(writebarrierfn("writebarrieriface", t, n.Right.Type), nil, init, l, n.Right)
} else if t.Width <= int64(4*Widthptr) {
x := int64(0)
- if applywritebarrier_bv == nil {
+ if applywritebarrier_bv.b == nil {
applywritebarrier_bv = bvalloc(obj.BitsPerPointer * 4)
}
bvresetall(applywritebarrier_bv)
