From 8b3f554d869e1d6e7a0bd1574135402cfc6dc1a3 Mon Sep 17 00:00:00 2001
From: Michael Hudson-Doyle <[email protected]>
Date: Mon, 5 Oct 2015 16:07:59 +1300
Subject: [PATCH 38/63] [release-branch.go1.5] cmd/compile: do not let regopt
 use REGTMP on ppc64

ppc64 codegen assumes that it is OK to stomp on r31 at any time, but it is not
excluded from the set of registers that regopt is allowed to use.

Fixes #12597

Change-Id: I29c7655e32abd22f3c21d88427b73e4fca055233
Reviewed-on: https://go-review.googlesource.com/15245
Reviewed-by: Minux Ma <[email protected]>
Reviewed-on: https://go-review.googlesource.com/16981
Run-TryBot: Austin Clements <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Russ Cox <[email protected]>
---
 src/cmd/compile/internal/ppc64/reg.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cmd/compile/internal/ppc64/reg.go b/src/cmd/compile/internal/ppc64/reg.go
index fa1cb71..a301836 100644
--- a/src/cmd/compile/internal/ppc64/reg.go
+++ b/src/cmd/compile/internal/ppc64/reg.go
@@ -111,7 +111,7 @@ func regnames(n *int) []string {
 
 func excludedregs() uint64 {
 	// Exclude registers with fixed functions
-	regbits := uint64(1<<0 | RtoB(ppc64.REGSP) | RtoB(ppc64.REGG) | RtoB(ppc64.REGTLS))
+	regbits := uint64(1<<0 | RtoB(ppc64.REGSP) | RtoB(ppc64.REGG) | RtoB(ppc64.REGTLS) | RtoB(ppc64.REGTMP))
 
 	// Also exclude floating point registers with fixed constants
 	regbits |= RtoB(ppc64.REG_F27) | RtoB(ppc64.REG_F28) | RtoB(ppc64.REG_F29) | RtoB(ppc64.REG_F30) | RtoB(ppc64.REG_F31)
-- 
2.6.1