1 files changed, 60 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/arm/ggen.go b/src/cmd/compile/internal/arm/ggen.go
new file mode 100644
index 0000000..f2c6763
--- /dev/null
+++ b/src/cmd/compile/internal/arm/ggen.go
@@ -0,0 +1,60 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package arm
+
+import (
+	"cmd/compile/internal/ir"
+	"cmd/compile/internal/objw"
+	"cmd/compile/internal/types"
+	"cmd/internal/obj"
+	"cmd/internal/obj/arm"
+)
+
+func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, r0 *uint32) *obj.Prog {
+	if cnt == 0 {
+		return p
+	}
+	if *r0 == 0 {
+		p = pp.Append(p, arm.AMOVW, obj.TYPE_CONST, 0, 0, obj.TYPE_REG, arm.REG_R0, 0)
+		*r0 = 1
+	}
+
+	if cnt < int64(4*types.PtrSize) {
+		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
+			p = pp.Append(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REGSP, 4+off+i)
+		}
+	} else if cnt <= int64(128*types.PtrSize) {
+		p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0)
+		p.Reg = arm.REGSP
+		p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
+		p.To.Name = obj.NAME_EXTERN
+		p.To.Sym = ir.Syms.Duffzero
+		p.To.Offset = 4 * (128 - cnt/int64(types.PtrSize))
+	} else {
+		p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, 4+off, obj.TYPE_REG, arm.REG_R1, 0)
+		p.Reg = arm.REGSP
+		p = pp.Append(p, arm.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, arm.REG_R2, 0)
+		p.Reg = arm.REG_R1
+		p = pp.Append(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REG_R1, 4)
+		p1 := p
+		p.Scond |= arm.C_PBIT
+		p = pp.Append(p, arm.ACMP, obj.TYPE_REG, arm.REG_R1, 0, obj.TYPE_NONE, 0, 0)
+		p.Reg = arm.REG_R2
+		p = pp.Append(p, arm.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0)
+		p.To.SetTarget(p1)
+	}
+
+	return p
+}
+
+func ginsnop(pp *objw.Progs) *obj.Prog {
+	p := pp.Prog(arm.AAND)
+	p.From.Type = obj.TYPE_REG
+	p.From.Reg = arm.REG_R0
+	p.To.Type = obj.TYPE_REG
+	p.To.Reg = arm.REG_R0
+	p.Scond = arm.C_SCOND_EQ
+	return p
+}