ir.EditChildren(n, o.edit)
		return n

	// Addition of strings turns into a function call.
	// Allocate a temporary to hold the strings.
	// Fewer than 5 strings use direct runtime helpers.
	case ir.OADDSTR:
		n := n.(*ir.AddStringExpr)
		o.exprList(n.List)

		if len(n.List) > 5 {
			t := types.NewArray(types.Types[types.TSTRING], int64(len(n.List)))
			n.Prealloc = o.newTemp(t, false)
		}

		log.Fatal(err)
	}
	res2, err := ts.Client().Get(ts.URL)
	if err != nil {
		log.Fatal(err)
	}
	addr1 := res1.Header.Get("X-Addr")
	addr2 := res2.Header.Get("X-Addr")
	if addr1 == "" || addr1 != addr2 {
		t.Errorf("addr1, addr2 = %q, %q; want same", addr1, addr2)
	}
}

func TestHijackBeforeRequestBodyRead(t *testing.T) {
	run(t, testHijackBeforeRequestBodyRead, []testMode{http1Mode})
}

}

func (s *state) instrument2(t *types.Type, addr, addr2 *ssa.Value, kind instrumentKind) {
	if !s.instrumentMemory {
		return
	}

	w := t.Size()
	if w == 0 {
		return // can't race on zero-sized things
	}

	if ssa.IsSanitizerSafeAddr(addr) {
		return
	}

	var fn *obj.LSym
	needWidth := false

	if addr2 != nil && kind != instrumentMove {

// Copyright 2015 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.

// Lowering arithmetic
(Add(64|32|16|8) ...) => (ADD(Q|L|L|L) ...)
(AddPtr ...) => (ADDQ ...)
(Add(32|64)F ...) => (ADDS(S|D) ...)

(Sub(64|32|16|8) ...) => (SUB(Q|L|L|L) ...)
(SubPtr ...) => (SUBQ ...)
(Sub(32|64)F ...) => (SUBS(S|D) ...)

(Mul(64|32|16|8) ...) => (MUL(Q|L|L|L) ...)

	v_1 := v.Args[1]
	v_0 := v.Args[0]
	// match: (AddPtr <t> x (Const64 [c]))
	// result: (OffPtr <t> x [c])
	for {
		t := v.Type
		x := v_0
		if v_1.Op != OpConst64 {
			break
		}
		c := auxIntToInt64(v_1.AuxInt)
		v.reset(OpOffPtr)
		v.Type = t
		v.AuxInt = int64ToAuxInt(c)
		v.AddArg(x)
		return true
	}
	// match: (AddPtr <t> x (Const32 [c]))
	// result: (OffPtr <t> x [int64(c)])

		argLen:      2,
		commutative: true,
		generic:     true,
	},
	{
		name:        "Add64",
		argLen:      2,
		commutative: true,
		generic:     true,
	},
	{
		name:    "AddPtr",
		argLen:  2,
		generic: true,
	},
	{
		name:        "Add32F",
		argLen:      2,
		commutative: true,
		generic:     true,
	},
	{
		name:        "Add64F",