From: Cherry Zhang <cherryyz@google.com>
Date: Tue, 16 Aug 2016 09:57:38 +0000 (-0400)
Subject: cmd/compile: disable Duff's device on darwin/arm64
X-Git-Tag: go1.8beta1~1866
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=1e94d79f9dbe032d9c8c0f461ca6fb96e20c0b85;p=gostls13.git

cmd/compile: disable Duff's device on darwin/arm64

Darwin linker does not support BR26 reloc with non-zero addend.

Fixes #16724.

Change-Id: I1b5b4dc7159141bde3e273490f435c08c583afaf
Reviewed-on: https://go-review.googlesource.com/27081
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dave Cheney <dave@cheney.net>
---

diff --git a/src/cmd/compile/internal/ssa/config.go b/src/cmd/compile/internal/ssa/config.go
index 149ceae379..72122a7b44 100644
--- a/src/cmd/compile/internal/ssa/config.go
+++ b/src/cmd/compile/internal/ssa/config.go
@@ -181,6 +181,7 @@ func NewConfig(arch string, fe Frontend, ctxt *obj.Link, optimize bool) *Config
 		c.fpRegMask = fpRegMaskARM64
 		c.FPReg = framepointerRegARM64
 		c.hasGReg = true
+		c.noDuffDevice = obj.Getgoos() == "darwin" // darwin linker cannot handle BR26 reloc with non-zero addend
 	case "ppc64le":
 		c.IntSize = 8
 		c.PtrSize = 8