Index: src/cmd/compile/internal/ssa/config.go
--- src/cmd/compile/internal/ssa/config.go.orig
+++ src/cmd/compile/internal/ssa/config.go
@@ -188,6 +188,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Lin
 		c.haveBswap64 = true
 		c.haveBswap32 = true
 		c.haveBswap16 = true
+		c.noDuffDevice = true
 	case "386":
 		c.PtrSize = 4
 		c.RegSize = 4
@@ -233,6 +234,7 @@ func NewConfig(arch string, types Types, ctxt *obj.Lin
 		c.haveBswap64 = true
 		c.haveBswap32 = true
 		c.haveBswap16 = true
+		c.noDuffDevice = true
 	case "ppc64":
 		c.BigEndian = true
 		fallthrough
