1 files changed, 73 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/arm64/ggen.go b/src/cmd/compile/internal/arm64/ggen.go
new file mode 100644
index 0000000..a681adc
--- /dev/null
+++ b/src/cmd/compile/internal/arm64/ggen.go
@@ -0,0 +1,73 @@
+// 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 arm64
+
+import (
+	"cmd/compile/internal/ir"
+	"cmd/compile/internal/objw"
+	"cmd/compile/internal/types"
+	"cmd/internal/obj"
+	"cmd/internal/obj/arm64"
+)
+
+func padframe(frame int64) int64 {
+	// arm64 requires that the frame size (not counting saved FP&LR)
+	// be 16 bytes aligned. If not, pad it.
+	if frame%16 != 0 {
+		frame += 16 - (frame % 16)
+	}
+	return frame
+}
+
+func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
+	if cnt == 0 {
+		return p
+	}
+	if cnt < int64(4*types.PtrSize) {
+		for i := int64(0); i < cnt; i += int64(types.PtrSize) {
+			p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+off+i)
+		}
+	} else if cnt <= int64(128*types.PtrSize) {
+		if cnt%(2*int64(types.PtrSize)) != 0 {
+			p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+off)
+			off += int64(types.PtrSize)
+			cnt -= int64(types.PtrSize)
+		}
+		p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REG_R20, 0)
+		p = pp.Append(p, arm64.AADD, obj.TYPE_CONST, 0, 8+off, obj.TYPE_REG, arm64.REG_R20, 0)
+		p.Reg = arm64.REG_R20
+		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 * (64 - cnt/(2*int64(types.PtrSize)))
+	} else {
+		// Not using REGTMP, so this is async preemptible (async preemption clobbers REGTMP).
+		// We are at the function entry, where no register is live, so it is okay to clobber
+		// other registers
+		const rtmp = arm64.REG_R20
+		p = pp.Append(p, arm64.AMOVD, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, rtmp, 0)
+		p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REGRT1, 0)
+		p = pp.Append(p, arm64.AADD, obj.TYPE_REG, rtmp, 0, obj.TYPE_REG, arm64.REGRT1, 0)
+		p.Reg = arm64.REGRT1
+		p = pp.Append(p, arm64.AMOVD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, rtmp, 0)
+		p = pp.Append(p, arm64.AADD, obj.TYPE_REG, rtmp, 0, obj.TYPE_REG, arm64.REGRT2, 0)
+		p.Reg = arm64.REGRT1
+		p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGRT1, int64(types.PtrSize))
+		p.Scond = arm64.C_XPRE
+		p1 := p
+		p = pp.Append(p, arm64.ACMP, obj.TYPE_REG, arm64.REGRT1, 0, obj.TYPE_NONE, 0, 0)
+		p.Reg = arm64.REGRT2
+		p = pp.Append(p, arm64.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(arm64.AHINT)
+	p.From.Type = obj.TYPE_CONST
+	return p
+}