ArchitectureInternal x64 = Architectures.forInput("x86_64");
        ArchitectureInternal ia64 = Architectures.forInput("ia64");
        ArchitectureInternal armv7 = Architectures.forInput("armv7");
        ArchitectureInternal aarch64 = Architectures.forInput("aarch64");
        ArchitectureInternal sparc = Architectures.forInput("sparc");

    public static final KnownArchitecture ARM_V7 = new KnownArchitecture("arm-v7", "armv7", "arm", "arm32");
    public static final KnownArchitecture AARCH64 = new KnownArchitecture("aarch64", "arm-v8", "arm64");

    private static final List<KnownArchitecture> KNOWN_ARCHITECTURES = asList(
            X86,
            X86_64,
            IA_64,
            ARM_V7,
            AARCH64,
            new KnownArchitecture("ppc"),

		// kernels still require 32-bit aligned access to network
		// subsystem.
		if sizeofPtr == 8 {
			salign = 4
		}
	case "netbsd", "openbsd":
		// NetBSD and OpenBSD armv7 require 64-bit alignment.
		if runtime.GOARCH == "arm" {
			salign = 8
		}
		// NetBSD aarch64 requires 128-bit alignment.
		if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm64" {
			salign = 16
		}
	}

		// kernels still require 32-bit aligned access to network
		// subsystem.
		if SizeofPtr == 8 {
			salign = 4
		}
	case "netbsd", "openbsd":
		// NetBSD and OpenBSD armv7 require 64-bit alignment.
		if runtime.GOARCH == "arm" {
			salign = 8
		}
		// NetBSD aarch64 requires 128-bit alignment.
		if runtime.GOOS == "netbsd" && runtime.GOARCH == "arm64" {
			salign = 16
		}

 *         <td>Sparc</td>
 *         <td>"sparc", "sparc32", "sparc-v8"</td>
 *         <td>"sparc64", "ultrasparc", "sparc-v9"</td>
 *     </tr>
 *     <tr>
 *         <td>ARM</td>
 *         <td>"arm", "arm-v7", "armv7", "arm32"</td>
 *         <td>"aarch64", "arm64", "arm-v8"</td>
 *     </tr>
 * </table>
 */
@HasInternalProtocol
public interface Architecture extends Named {
    @Override
    @Input
    String getName();

//go:build !linux

#include "textflag.h"

// TODO(minux): this is only valid for ARMv6+
// bool armcas(int32 *val, int32 old, int32 new)
// Atomically:
//	if(*val == old){
//		*val = new;
//		return 1;
//	}else
//		return 0;
TEXT	·Cas(SB),NOSPLIT,$0
	JMP	·armcas(SB)

// Non-linux OSes support only single processor machines before ARMv7.
// So we don't need memory barriers if goarm < 7. And we fail loud at

	MOVB	R0, ret+12(FP)
	RET

// As for cas, memory barriers are complicated on ARM, but the kernel
// provides a user helper. ARMv5 does not support SMP and has no
// memory barrier instruction at all. ARMv6 added SMP support and has
// a memory barrier, but it requires writing to a coprocessor
// register. ARMv7 introduced the DMB instruction, but it's expensive
// even on single-core devices. The kernel helper takes care of all of
// this for us.

    }

    def "test ARM aliases"() {
        expect:
        Architectures.forInput(architecture).isArm32()
        Architectures.forInput(architecture).isArm()
        where:
        architecture << [ "arm", "armv7" ]
    }

    def "test ARM 64 aliases"() {
        expect:
        Architectures.forInput(architecture).isArm64()
        Architectures.forInput(architecture).isArm()
        where:

	}

	// HWCAP feature bits
	ARM.HasVFPv4 = isSet(HWCap, hwcap_VFPv4)
	ARM.HasIDIVA = isSet(HWCap, hwcap_IDIVA)
	// lpae is required to make the 64-bit instructions LDRD and STRD (and variants) atomic.
	// See ARMv7 manual section B1.6.
	// We also need at least a v7 chip, for the DMB instruction.
	ARM.HasV7Atomics = isSet(HWCap, hwcap_LPAE) && isV7(Platform)
}

func isSet(hwc uint, value uint) bool {
	return hwc&value != 0
}

// have been created by llvm-rc or msvc's rc.exe, which means there's the
// @feat.00 symbol as well as split .rsrc$00 and .rsrc$01 section to deal with.
//
// rsrc.syso is created using llvm with:
//    {i686,x86_64,armv7,arm64}-w64-mingw32-windres -i a.rc -o rsrc_$GOARCH.syso -O coff
// where this windres calls into llvm-rc and llvm-cvtres. The source file,
// a.rc, simply contains a reference to its own bytes:
//
//    resname RCDATA a.rc
//