system object code because cmd/link is not sophisticated enough to process
the real code.

The main benefits of this system are that cmd/link remains relatively simple
(it does not need to implement a complete ELF and Mach-O linker) and
that gcc is not needed after the package is compiled. For example,
package net uses cgo for access to name resolution functions provided

to hold temporary values.
Hand-written assembly can use <code>R11</code>, but doing so requires
being sure that the linker is not also using it to implement any of the other
instructions in the function.
</p>

<p>
When defining a <code>TEXT</code>, specifying frame size <code>$-4</code>

pkg image/png, type Encoder struct
pkg image/png, type Encoder struct, CompressionLevel CompressionLevel

# CL 101750048 math: implement Nextafter32, Robert Griesemer <******@****.***>
pkg math, func Nextafter32(float32, float32) float32

# CL 93550043 math/big: implement Rat.Float32, Robert Griesemer <******@****.***>
pkg math/big, method (*Rat) Float32() (float32, bool)

			prog.From = a[0]
			if a[1].Type == obj.TYPE_REG {
				prog.Reg = p.getRegister(prog, op, &a[1])
			} else {
				prog.AddRestSource(a[1])
			}
			prog.To = a[2]
		default:
			p.errorf("TODO: implement three-operand instructions for this architecture")
			return
		}
	case 4:
		if p.arch.Family == sys.ARM {
			if arch.IsARMBFX(op) {
				// a[0] and a[1] must be constants, a[2] and a[3] must be registers