From 4f81684f8640e81b1c337a6b88488a888d13abea Mon Sep 17 00:00:00 2001
From: Austin Clements <austin@google.com>
Date: Wed, 5 Nov 2014 15:36:47 -0500
Subject: [PATCH] [dev.power64] 6g: don't create variables for indirect
 addresses

Previously, mkvar treated, for example, 0(AX) the same as AX.
As a result, a move to an indirect address would be marked as
*setting* the register, rather than just using it, resulting
in unnecessary register moves.  Fix this by not producing
variables for indirect addresses.

LGTM=rsc
R=rsc, dave
CC=golang-codereviews
https://golang.org/cl/164610043
---
 src/cmd/6g/reg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cmd/6g/reg.c b/src/cmd/6g/reg.c
index 8d600d64336..afd3f1056e5 100644
--- a/src/cmd/6g/reg.c
+++ b/src/cmd/6g/reg.c
@@ -621,6 +621,9 @@ mkvar(Reg *r, Adr *a)
 	if(r != R)
 		r->use1.b[0] |= doregbits(a->index);
 
+	if(t >= D_INDIR && t < 2*D_INDIR)
+		goto none;
+
 	switch(t) {
 	default:
 		regu = doregbits(t);