telemetry.Inc("go/platform/target/goarch:" + cfg.Goarch)
	switch cfg.Goarch {
	case "386":
		telemetry.Inc("go/platform/target/go386:" + cfg.GO386)
	case "amd64":
		telemetry.Inc("go/platform/target/goamd64:" + cfg.GOAMD64)
	case "arm":
		telemetry.Inc("go/platform/target/goarm:" + cfg.GOARM)
	case "arm64":
		telemetry.Inc("go/platform/target/goarm64:" + cfg.GOARM64)
	case "mips":

	GOARM, goARMChanged         = EnvOrAndChanged("GOARM", fmt.Sprint(buildcfg.GOARM))
	GO386, go386Changed         = EnvOrAndChanged("GO386", buildcfg.GO386)
	GOAMD64, goAMD64Changed     = EnvOrAndChanged("GOAMD64", fmt.Sprintf("%s%d", "v", buildcfg.GOAMD64))
	GOMIPS, goMIPSChanged       = EnvOrAndChanged("GOMIPS", buildcfg.GOMIPS)
	GOMIPS64, goMIPS64Changed   = EnvOrAndChanged("GOMIPS64", buildcfg.GOMIPS64)

	b = os.Getenv("GOARM64")
	if b == "" {
		b = "v8.0"
	}
	goarm64 = b

	b = os.Getenv("GO386")
	if b == "" {
		b = "sse2"
	}
	go386 = b

	b = os.Getenv("GOAMD64")
	if b == "" {
		b = "v1"
	}
	goamd64 = b

	b = os.Getenv("GOMIPS")
	if b == "" {
		b = "hardfloat"
	}
	gomips = b

	b = os.Getenv("GOMIPS64")
	if b == "" {
		b = "hardfloat"
	}
	gomips64 = b

	if cfg.Goarch == "386" {
		// Define GO386_value from cfg.GO386.
		args = append(args, "-D", "GO386_"+cfg.GO386)
	}

	if cfg.Goarch == "amd64" {
		// Define GOAMD64_value from cfg.GOAMD64.
		args = append(args, "-D", "GOAMD64_"+cfg.GOAMD64)
	}

	if cfg.Goarch == "mips" || cfg.Goarch == "mipsle" {
		// Define GOMIPS_value from cfg.GOMIPS.
		args = append(args, "-D", "GOMIPS_"+cfg.GOMIPS)
	}

For GOARCH=amd64, arm, ppc64, ppc64le, and riscv64, a particular feature level
sets the feature build tags for all previous levels as well.
For example, GOAMD64=v2 sets the amd64.v1 and amd64.v2 feature flags.
This ensures that code making use of v2 features continues to compile
when, say, GOAMD64=v4 is introduced.
Code handling the absence of a particular feature level
should use a negation:

	//go:build !amd64.v2

// sets the feature build tags for all previous levels as well.
// For example, GOAMD64=v2 sets the amd64.v1 and amd64.v2 feature flags.
// This ensures that code making use of v2 features continues to compile
// when, say, GOAMD64=v4 is introduced.
// Code handling the absence of a particular feature level
// should use a negation:
//
//	//go:build !amd64.v2
//

	MOVQ	CX, g(BX)
	LEAQ	runtime·m0(SB), AX

	// save m->g0 = g0
	MOVQ	CX, m_g0(AX)
	// save m0 to g0->m
	MOVQ	AX, g_m(CX)

	CLD				// convention is D is always left cleared

	// Check GOAMD64 requirements
	// We need to do this after setting up TLS, so that
	// we can report an error if there is a failure. See issue 49586.
#ifdef NEED_FEATURES_CX
	MOVL	$0, AX
	CPUID
	CMPL	AX, $0
	JE	bad_cpu

			if !s.config.UseFMA {
				s.vars[n] = s.callResult(n, callNormal) // types.Types[TFLOAT64]
				return s.variable(n, types.Types[types.TFLOAT64])
			}

			if buildcfg.GOAMD64 >= 3 {
				return s.newValue3(ssa.OpFMA, types.Types[types.TFLOAT64], args[0], args[1], args[2])
			}

			v := s.entryNewValue0A(ssa.OpHasCPUFeature, types.Types[types.TBOOL], ir.Syms.X86HasFMA)
			b := s.endBlock()