return err
}

// TestPGOHash tests that PGO optimization decisions can be selected by pgohash.
func TestPGOHash(t *testing.T) {
	testenv.MustHaveGoRun(t)
	t.Parallel()

	const pkg = "example.com/pgo/inline"

	wd, err := os.Getwd()
	if err != nil {
		t.Fatalf("error getting wd: %v", err)
	}
	srcDir := filepath.Join(wd, "testdata/pgo/inline")

// Also ignore test files.
var ignoreSuffixes = []string{
	"_test.s",
	"_test.go",
	// Skip PGO profile. No need to build toolchain1 compiler
	// with PGO. And as it is not a text file the import path
	// rewrite will break it.
	".pgo",
	// Skip editor backup files.
	"~",
}

var tryDirs = []string{
	"sdk/go1.17",
	"go1.17",
}

	HotPgo                           // By PGO-based heuristics, this block occurs in a hot loop

	HotNot                 = 0
	HotInitialNotFlowIn    = HotInitial | HotNotFlowIn          // typically first block of a rotated loop, loop is entered with a branch (not to this block).  No PGO

	return b.build(ctx, a)
}

// pgoActionID computes the action ID for a preprocess PGO action.
func (b *Builder) pgoActionID(input string) cache.ActionID {
	h := cache.NewHash("preprocess PGO profile " + input)

	fmt.Fprintf(h, "preprocess PGO profile\n")
	fmt.Fprintf(h, "preprofile %s\n", b.toolID("preprofile"))
	fmt.Fprintf(h, "input %q\n", b.fileHash(input))

	return h.Sum()

// 76     -5n         PROMOTED runtime.persistentalloc   mcheckmark.go:48:45|3   inLoopAdj
// 201    0           --- PGO  unicode.DecodeRuneInString        utf8.go:312:30|1
// 7      -5          --- PGO  internal/abi.Name.DataChecked     type.go:625:22|0        inLoopAdj
//
// In the dump above, "Score" is the final score calculated for the

		included from, and overlays will not appear when binaries and tests are
		run through go run and go test respectively.
	-pgo file
		specify the file path of a profile for profile-guided optimization (PGO).
		When the special name "auto" is specified, for each main package in the
		build, the go command selects a file named "default.pgo" in the package's
		directory if that file exists, and applies it to the (transitive)

// pointer from a well-known register (DX on x86 architecture, etc.) directly.
//
// WARNING: PGO-based devirtualization cannot detect that caller of
// getclosureptr require closure context, and thus must maintain a list of
// these functions, which is in
// cmd/compile/internal/devirtualize/pgo.maybeDevirtualizeFunctionCall.
func getclosureptr() uintptr

//go:noescape

		// See golang.org/issue/30907, golang.org/issue/34114.
		if p.Name == "main" && p != pmain && p != ptest {
			split()
		}
		// Split and attach PGO information to test dependencies if preal
		// is built with PGO.
		if preal.Internal.PGOProfile != "" && p.Internal.PGOProfile == "" {
			split()
		}
	}

	// Do search to find cycle.

		return true
	}

	// Check to see if the action output is cached.
	if file, _, err := cache.GetFile(c, actionHash); err == nil {
		if a.Mode == "preprocess PGO profile" {
			// Preprocessed PGO profiles don't embed a build ID, so
			// skip the build ID lookup.
			// TODO(prattmic): better would be to add a build ID to the format.
			a.built = file
			a.Target = "DO NOT USE - using cache"

	BuildN             bool                    // -n flag
	BuildO             string                  // -o flag
	BuildP             = runtime.GOMAXPROCS(0) // -p flag
	BuildPGO           string                  // -pgo flag
	BuildPkgdir        string                  // -pkgdir flag
	BuildRace          bool                    // -race flag
	BuildToolexec      []string                // -toolexec flag
	BuildToolchainName string