{sr("a", nameSize) + "/a", sr("a", nameSize), "a", true},
		{sr("a", prefixSize) + "/", "", "", false},
		{sr("a", prefixSize) + "/a", sr("a", prefixSize), "a", true},
		{sr("a", nameSize+1), "", "", false},
		{sr("/", nameSize+1), sr("/", nameSize-1), "/", true},
		{sr("a", prefixSize) + "/" + sr("b", nameSize),
			sr("a", prefixSize), sr("b", nameSize), true},
		{sr("a", prefixSize) + "//" + sr("b", nameSize), "", "", false},

		return "", "", false
	} else if length > prefixSize+1 {
		length = prefixSize + 1
	} else if name[length-1] == '/' {
		length--
	}

	i := strings.LastIndex(name[:length], "/")
	nlen := len(name) - i - 1 // nlen is length of suffix
	plen := i                 // plen is length of prefix
	if i <= 0 || nlen > nameSize || nlen == 0 || plen > prefixSize {
		return "", "", false
	}

// is available
type PrefixableOptab struct {
	Optab
	minGOPPC64 int  // Minimum GOPPC64 required to support this.
	pfxsize    int8 // Instruction sequence size when prefixed opcodes are used
}

// The prefixable optab entry contains the pseudo-opcodes which generate relocations, or may generate
// a more efficient sequence of instructions if a prefixed version exists (ex. paddi instead of oris/ori/add).
//