MOVD	8*36(g), g

	// this might be called in external code context,
	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVD	R0, 8(RSP)		// signum
	MOVB	runtime·iscgo(SB), R0
	CMP 	$0, R0
	// XXX branch destination
	BEQ	2(PC)
	BL	runtime·load_g(SB)

	// Restore signum to R0.
	MOVW	8(RSP), R0
	// R1 and R2 already contain info and ctx, respectively.

	SAVE_R19_TO_R28(8*4)
	SAVE_F8_TO_F15(8*14)

	// this might be called in external code context,
	// where g is not set.
	// first save R0, because runtime·load_g will clobber it
	MOVW	R0, 8(RSP)
	MOVBU	runtime·iscgo(SB), R0
	CMP	$0, R0
	BEQ	2(PC)
	BL	runtime·load_g(SB)

	// Restore signum to R0.
	MOVW	8(RSP), R0
	// R1 and R2 already contain info and ctx, respectively.

// NOTE: gogo assumes load_g only clobers g (R30) and REGTMP (R23)
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB), R23
	BEQ	R23, nocgo

	MOVW	R3, R23
	MOVW	g, runtime·tls_g(SB) // TLS relocation clobbers R3
	MOVW	R23, R3

nocgo:
	RET

TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	runtime·tls_g(SB), g // TLS relocation clobbers R3
	RET

	"testing"
)

type T struct {
	x [2]int64 // field that will be clobbered. Also makes type not SSAable.
	p *byte    // has a pointer
}

//go:noinline
func makeT() T {
	return T{}
}

var g T

var sink interface{}

func TestIssue15854(t *testing.T) {
	for i := 0; i < 10000; i++ {
		if g.x[0] != 0 {
			t.Fatalf("g.x[0] clobbered with %x\n", g.x[0])
		}

//
// NOTE: mcall() assumes this clobbers only R23 (REGTMP).
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB), R23
	BEQ	R23, nocgo

	MOVV	R3, R23	// save R3
	MOVV	g, runtime·tls_g(SB) // TLS relocation clobbers R3
	MOVV	R23, R3	// restore R3

nocgo:
	RET

TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVV	runtime·tls_g(SB), g // TLS relocation clobbers R3
	RET

// run

// Copyright 2019 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.

// Issue 30977: write barrier call clobbers volatile
// value when there are multiple uses of the value.

package main

import "runtime"

type T struct {
	a, b, c, d, e string
}

//go:noinline
func g() T {
	return T{"a", "b", "c", "d", "e"}
}

	MOVQ R15, AX // ERROR "when dynamic linking, R15 is clobbered by a global variable access and is used here"
	RET
TEXT ·a8(SB), 0, $0-0
	CMPL runtime·writeBarrier(SB), $0
	ADDQ AX, R15 // ERROR "when dynamic linking, R15 is clobbered by a global variable access and is used here"
	RET
TEXT ·a9(SB), 0, $0-0
	CMPL runtime·writeBarrier(SB), $0
	ORQ R15, R15 // ERROR "when dynamic linking, R15 is clobbered by a global variable access and is used here"
	RET

// thread-local memory, so that we can call externally compiled
// ppc64 code that will overwrite this register.
//
// If !iscgo, this is a no-op.
//
// NOTE: setg_gcc<> assume this clobbers only R31.
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
#ifndef GOOS_aix
#ifndef GOOS_openbsd
	MOVBZ	runtime·iscgo(SB), R31
	CMP	R31, $0
	BEQ	nocgo
#endif
#endif
	MOVD	runtime·tls_g(SB), R31

// thread-local memory, so that we can call externally compiled
// s390x code that will overwrite this register.
//
// If !iscgo, this is a no-op.
//
// NOTE: setg_gcc<> assume this clobbers only R10 and R11.
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB),  R10
	CMPBEQ	R10, $0, nocgo
	MOVW	AR0, R11
	SLD	$32, R11
	MOVW	AR1, R11
	MOVD	runtime·tls_g(SB), R10
	MOVD	g, 0(R10)(R11*1)

    @Override
    public void writeTo(OutputStream output) throws IOException {
        Closer closer = Closer.create();
        closer.register(output);
        try {
            stored = true;
            Files.asByteSource(file).copyTo(output);
        } catch (Exception e) {
            throw closer.rethrow(e);
        } finally {
            closer.close();
        }
    }

    public boolean isStored() {