From: Cherry Zhang <cherryyz@google.com>
Date: Thu, 11 Aug 2016 13:54:04 +0000 (-0400)
Subject: cmd/compile: remove nil check in accessing PAUTOHEAP variable
X-Git-Tag: go1.8beta1~1858
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=4c4ca8312064cc47bc3b3cd5efc43ff5b89f4dff;p=gostls13.git

cmd/compile: remove nil check in accessing PAUTOHEAP variable

CL 23393 introduces PAUTOHEAP, and access of PAUTOHEAP variable is
rewritten to indirection of a PAUTO variable. Mark this variable
non-nil, so this indirection does not introduce extra nil checks.

Change-Id: I31853eed5e60238b6c5bc0546e2e9ab340dcddd9
Reviewed-on: https://go-review.googlesource.com/26831
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
---

diff --git a/src/cmd/compile/internal/gc/walk.go b/src/cmd/compile/internal/gc/walk.go
index 1e7d80d3e9..88ac347ad7 100644
--- a/src/cmd/compile/internal/gc/walk.go
+++ b/src/cmd/compile/internal/gc/walk.go
@@ -506,7 +506,9 @@ func walkexpr(n *Node, init *Nodes) *Node {
 	if n.Op == ONAME && n.Class == PAUTOHEAP {
 		nn := Nod(OIND, n.Name.Heapaddr, nil)
 		nn = typecheck(nn, Erv)
-		return walkexpr(nn, init)
+		nn = walkexpr(nn, init)
+		nn.Left.NonNil = true
+		return nn
 	}
 
 opswitch: