{Name: "thumbee", Feature: &ARM.HasTHUMBEE},
		{Name: "tls", Feature: &ARM.HasTLS},
		{Name: "vfp", Feature: &ARM.HasVFP},
		{Name: "vfpd32", Feature: &ARM.HasVFPD32},
		{Name: "vfpv3", Feature: &ARM.HasVFPv3},
		{Name: "vfpv3d16", Feature: &ARM.HasVFPv3D16},
		{Name: "vfpv4", Feature: &ARM.HasVFPv4},
		{Name: "half", Feature: &ARM.HasHALF},
		{Name: "26bit", Feature: &ARM.Has26BIT},
		{Name: "fastmul", Feature: &ARM.HasFASTMUL},

// HWCAP/HWCAP2 bits. These are exposed by Linux and FreeBSD.
const (
	hwcap_VFPv4 = 1 << 16
	hwcap_IDIVA = 1 << 17
	hwcap_LPAE  = 1 << 20
)

func doinit() {
	options = []option{
		{Name: "vfpv4", Feature: &ARM.HasVFPv4},
		{Name: "idiva", Feature: &ARM.HasIDIVA},
		{Name: "v7atomics", Feature: &ARM.HasV7Atomics},
	}

	// HWCAP feature bits
	ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)

		{name: "MULSD", argLength: 3, reg: fp31, asm: "MULSD", resultInArg0: true}, // arg0 - (arg1 * arg2)

		// FMULAD only exists on platforms with the VFPv4 instruction set.
		// Any use must be preceded by a successful check of runtime.arm_support_vfpv4.
		{name: "FMULAD", argLength: 3, reg: fp31, asm: "FMULAD", resultInArg0: true}, // arg0 + (arg1 * arg2)

// license that can be found in the LICENSE file.

//go:build gc

package main

// useVFPv1 tries to execute one VFPv1 instruction on ARM.
// It will crash the current process if VFPv1 is missing.
func useVFPv1()

// useVFPv3 tries to execute one VFPv3 instruction on ARM.
// It will crash the current process if VFPv3 is missing.
func useVFPv3()

// useARMv6K tries to run ARMv6K instructions on ARM.

	if runtime.GOMAXPROCS(0) == 1 {
		maxbg = 1
	}
	bginit()

	if len(os.Args) > 1 && os.Args[1] == "-check-goarm" {
		useVFPv1() // might fail with SIGILL
		println("VFPv1 OK.")
		useVFPv3() // might fail with SIGILL
		println("VFPv3 OK.")
		os.Exit(0)
	}

	xinit()
	xmain()
	xexit(0)
}

// The OS-specific main calls into the portable code here.
func xmain() {
	if len(os.Args) < 2 {

		print("to GOARM.\n")
		exit(1)
	}
	if goarm > 6 && cpu.HWCap&_HWCAP_VFPv3 == 0 && goarmsoftfp == 0 {
		print("runtime: this CPU has no VFPv3 floating point hardware, so it cannot run\n")
		print("a binary compiled for VFPv3 hard floating point. Recompile adding ,softfloat\n")
		print("to GOARM or changing GOARM to 6.\n")
		exit(1)
	}

		print("to GOARM.\n")
		exit(1)
	}
	if goarm > 6 && cpu.HWCap&_HWCAP_VFPv3 == 0 && goarmsoftfp == 0 {
		print("runtime: this CPU has no VFPv3 floating point hardware, so it cannot run\n")
		print("a binary compiled for VFPv3 hard floating point. Recompile adding ,softfloat\n")
		print("to GOARM or changing GOARM to 6.\n")
		exit(1)
	}
}

func archauxv(tag, val uintptr) {
	switch tag {

//go:build gc

#include "textflag.h"

// try to run "vmov.f64 d0, d0" instruction
TEXT ·useVFPv1(SB),NOSPLIT,$0
	WORD $0xeeb00b40	// vmov.f64 d0, d0
	RET

// try to run VFPv3-only "vmov.f64 d0, #112" instruction
TEXT ·useVFPv3(SB),NOSPLIT,$0
	WORD $0xeeb70b00	// vmov.f64 d0, #112
	RET

// try to run ARMv6K (or above) "ldrexd" instruction
TEXT ·useARMv6K(SB),NOSPLIT,$32
	MOVW R13, R2

		// Seeing how far it gets determines which instructions failed.
		// The test is OS-agnostic.
		out := run("", 0, os.Args[0], "-check-goarm")
		v1ok := strings.Contains(out, "VFPv1 OK.")
		v3ok := strings.Contains(out, "VFPv3 OK.")
		if v1ok && v3ok {
			return "7"
		}
		if v1ok {
			return "6"
		}
		return "5"
	}

	// Otherwise, in the absence of local information, assume GOARM=7.
	//

	// We use GOARM.Version=7 and !GOARM.SoftFloat to gate the use of VFPv3 vmov (imm) instructions.
	if buildcfg.GOARM.Version < 7 || buildcfg.GOARM.SoftFloat || math.Float64bits(e) != 0 {
		return -1
	}
	return 0
}

func (c *ctxt5) chipfloat5(e float64) int {
	// We use GOARM.Version=7 and !GOARM.SoftFloat to gate the use of VFPv3 vmov (imm) instructions.
	if buildcfg.GOARM.Version < 7 || buildcfg.GOARM.SoftFloat {