if (!cst_op) return false;
  ElementsAttr value = cst_op.getValue();
  if (!value.isSplat()) return false;
  if (!value.getElementType().isF32()) return false;
  return std::abs(value.getSplatValue<float>() - val) < kTolerance;
}

// Determines if the given op is semantically that of the gauss error function.
bool MatchERF(Operation* op) {

}

func float64close(x, y float64) bool {
	x0 := float64NaNTo0(x)
	y0 := float64NaNTo0(y)
	diff := math.Abs(x0 - y0)
	den := math.Max(math.Abs(x0), math.Abs(y0))
	return den == 0 || diff/den < 1e-10
}

func uint64max(a, b uint64) uint64 {
	if b > a {
		return b
	}
	return a
}

func stateFal(s *scanner, c byte) int {
	if c == 's' {
		s.step = stateFals
		return scanContinue
	}
	return s.error(c, "in literal false (expecting 's')")
}

// stateFals is the state after reading `fals`.
func stateFals(s *scanner, c byte) int {
	if c == 'e' {
		s.step = stateEndValue
		return scanContinue
	}
	return s.error(c, "in literal false (expecting 'e')")
}

	SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, u_long offset, u_int scale); }
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, int facs, pid_t pid); }
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, const struct sigaction *nsa, struct sigaction *osa); }
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }

	SYS_PROFIL         = 44  // { int sys_profil(caddr_t samples, size_t size, u_long offset, u_int scale); }
	SYS_KTRACE         = 45  // { int sys_ktrace(const char *fname, int ops, int facs, pid_t pid); }
	SYS_SIGACTION      = 46  // { int sys_sigaction(int signum, const struct sigaction *nsa, struct sigaction *osa); }
	SYS_GETGID         = 47  // { gid_t sys_getgid(void); }

// This is known as "black box" testing.
//
//	package abs_test
//
//	import (
//		"testing"
//
//		"path_to_pkg/abs"
//	)
//
//	func TestAbs(t *testing.T) {
//	    got := abs.Abs(-1)
//	    if got != 1 {
//	        t.Errorf("Abs(-1) = %d; want 1", got)
//	    }
//	}
//
// For more detail, run "go help test" and "go help testflag".
//
// # Benchmarks
//

		}
		// and turn it into a float64
		x := math.Float64frombits(binary.LittleEndian.Uint64(b))
		if math.IsNaN(x) || math.IsInf(x, 0) {
			continue
		}
		x = math.Abs(x)
		if x < 0x1p-1000 { // avoid underflow patterns
			continue
		}
		frac, _ := math.Frexp(x) // 52 bits of randomness
		return frac*2 - 1
	}

FAB5          ; mapped                 ; 8779          # 4.1  CJK COMPATIBILITY IDEOGRAPH-FAB5
FAB6          ; mapped                 ; 8941          # 4.1  CJK COMPATIBILITY IDEOGRAPH-FAB6
FAB7          ; mapped                 ; 8986          # 4.1  CJK COMPATIBILITY IDEOGRAPH-FAB7
FAB8          ; mapped                 ; 8996          # 4.1  CJK COMPATIBILITY IDEOGRAPH-FAB8

	n = unsafe.Sizeof(uname.Version)
	if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
		return err
	}

	// The version might have newlines or tabs in it, convert them to
	// spaces.
	for i, b := range uname.Version {
		if b == '\n' || b == '\t' {
			if i == len(uname.Version)-1 {
				uname.Version[i] = 0
			} else {
				uname.Version[i] = ' '
			}

didn't know where to put the tab stops.  Another problem
was that some of the code assumed that string byte
offsets were the same as column offsets, which is only
true if there are no tabs.

In the process of fixing this, I cleaned up the arguments
to Fold and ExpandTabs and renamed them Break and
_ExpandTabs so that I could be sure that I found all the
call sites.  I also wanted to verify that ExpandTabs was